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  • Global optimization
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  • Mathematics  (66)
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  • 1
    ISSN: 1439-0361
    Keywords: mate choice ; taxonomy ; phenotypic hybrids ; fitness ; decision rule
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Die als Unterarten klassifizierten europäischen Formen der Aaskrähe, Rabenkrähe und Nebelkrähe, besiedeln verschiedene, aneinandergrenzende Verbreitungsgebiete und hybridisieren in der Kontaktzone. Die Nachkommen von Mischpaaren sind fruchtbar und können sowohl mit anderen Hybriden als auch mit Raben- und Nebelkrähen erfolgreich brüten. Trotzdem kommt es zu keiner völligen Vermischung der Formen und/oder Verlagerung der Verbreitungsgebiete. Vor diesem Hintergrund untersuchten wir die Partnerwahl von Aaskrähen in der Hybridisierungszone auf der nordfriesischen Insel Amrum und stellten fest, daß Partner gleichen Phänotyps häufiger miteinander verpaart waren, als stochastisch zu erwarten gewesen wäre. Unsere Daten bestätigen vergleichbare Studien aus Hybridisierungszonen in Italien und Sibirien. Wir schließen daraus, daß phänotypisch selektive Partnerwahl bei der Aaskrähe ein allgemeines Phänomen sein könnte und diskutieren, warum dieses Verhalten anfitness-relevante Parameter gekoppelt sein sollte. Um welche es sich dabei handeln könnte, wurde bisher nicht hinreichend untersucht und muß deshalb offen bleiben.
    Notes: Summary Carrion Crow and Hooded Crow are regarded as subspecies of the Crow. They show frequent hybridisation along the adjacent borders of their distribution. Mixed pairs produce fertile offspring which are able to breed successfully with both hybrids and mates of either phenotype. However, hybridisation does not lead to phenotypic changes of Carrion and Hooded Crows in general nor in their distinct distribution. We studied the mating behaviour of Crows in the hybrid zone on the Island of Amrum (Schleswig-Holstein, Germany) and found evidence that Crows may prefer mates of the same phenotype. Our data confirm previous studies which reported assortative mating with respect to plumage coloration from hybrid zones in Italy and Siberia. We discuss why this behaviour should be related tofitness traits which in our opinion have not yet been studied adequately nor identified.
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  • 2
    ISSN: 1572-9397
    Keywords: evolutionary algorithms ; genetic algorithms ; taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract This paper shows how evolutionary algorithms can be described in a concise, yet comprehensive and accurate way. A classification scheme is introduced and presented in a tabular form called TEA (Table of Evolutionary Algorithms). It distinguishes between different classes of evolutionary algorithms (e.g., genetic algorithms, ant systems) by enumerating the fundamental ingredients of each of these algorithms. At the end, possible uses of the TEA are illustrated on classical evolutionary algorithms.
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  • 3
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    Annals of operations research 58 (1995), S. 261-278 
    ISSN: 1572-9338
    Keywords: Global optimization ; Wiener process ; sequential stopping rules ; one-step look-ahead
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Abstract In this paper a new algorithm is proposed, based upon the idea of modeling the objective function of a global optimization problem as a sample path from a Wiener process. Unlike previous work in this field, in the proposed model the parameter of the Wiener process is considered as a random variable whose conditional (posterior) distribution function is updated on-line. Stopping criteria for Bayesian algorithms are discussed and detailed proofs on finite-time stopping are provided.
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  • 4
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    Minds and machines 5 (1995), S. 25-44 
    ISSN: 1572-8641
    Keywords: Cognition ; connectionism ; computationalism ; mental representation ; philosophy of mind
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Philosophy
    Notes: Abstract Computationalist theories of mind require brain symbols, that is, neural events that represent kinds or instances of kinds. Standard models of computation require multiple inscriptions of symbols with the same representational content. The satisfaction of two conditions makes it easy to see how this requirement is met in computers, but we have no reason to think that these conditions are satisfied in the brain. Thus, if we wish to give computationalist explanations of human cognition, without committing ourselvesa priori to a strong and unsupported claim in neuroscience, we must first either explain how we can provide multiple brain symbols with the same content, or explain how we can abandon standard models of computation. It is argued that both of these alternatives require us to explain the execution of complex tasks that have a cognition-like structure. Circularity or regress are thus threatened, unless noncomputationalist principles can provide the required explanations. But in the latter case, we do not know that noncomputationalist principles might not bear most of the weight of explaining cognition. Four possible types of computationalist theory are discussed; none appears to provide a promising solution to the problem. Thus, despite known difficulties in noncomputationalist investigations, we have every reason to pursue the search for noncomputationalist principles in cognitive theory.
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  • 5
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    Minds and machines 7 (1997), S. 571-579 
    ISSN: 1572-8641
    Keywords: systematicity ; connectionism ; cognitive architecture ; explanation ; structure-sensitivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Philosophy
    Notes: Abstract In his discussion of results which I (with Michael Hayward) recently reported in this journal, Kenneth Aizawa takes issue with two of our conclusions, which are: (a) that our connectionist model provides a basis for explaining systematicity “within the realm of sentence comprehension, and subject to a limited range of syntax” (b) that the model does not employ structure-sensitive processing, and that this is clearly true in the early stages of the network's training. Ultimately, Aizawa rejects both (a) and (b) for reasons which I think are ill-founded. In what follows, I offer a defense of our position. In particular, I argue (1) that Aizawa adopts a standard of explanation that many accepted scientific explanations could not meet, and (2) that Aizawa misconstrues the relevant meaning of ‘structure-sensitive process’.
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  • 6
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    Minds and machines 8 (1998), S. 353-374 
    ISSN: 1572-8641
    Keywords: connectionism ; explicit ; implicit ; process ; representation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Philosophy
    Notes: Abstract Explicitness has usually been approached from two points of view, labelled by Kirsh the structural and the process view, that hold opposite assumptions to determine when information is explicit. In this paper, we offer an intermediate view that retains intuitions from both of them. We establish three conditions for explicit information that preserve a structural requirement, and a notion of explicitness as a continuous dimension. A problem with the former accounts was their disconnection with psychological work on the issue. We review studies by Karmiloff-Smith, and Shanks and St. John to show that the proposed conditions have psychological grounds. Finally, we examine the problem of explicit rules in connectionist systems in the light of our framework.
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  • 7
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    Minds and machines 5 (1995), S. 161-185 
    ISSN: 1572-8641
    Keywords: Consciousness ; sensation (qualia) ; connectionism ; recurrent networks ; distributed representation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Philosophy
    Notes: Abstract Connectionism and phenomenology can mutually inform and mutually constrain each other. In this manifesto I outline an approach to consciousness based on distinctions developed by connectionists. Two core identities are central to a connectionist theory of consciouness: conscious states of mind are identical to occurrent activation patterns of processing units; and the variable dispositional strengths on connections between units store latent and unconscious information. Within this broad framework, a connectionist model of consciousness succeeds according to the degree of correspondence between the content of human consciousness (the world as it is experienced) and the interpreted content of the network. Constitutive self-awareness and reflective self-awareness can be captured in a model through its ability to respond to self-reflexive information, identify self-referential categories, and process information in the absence of simultaneous input. The qualitative “feel” of sensation appears in a model as states of activation that are not fully discriminated by later processing. Connectionism also uniquely explains several specific features of experience. The most important of these is the superposition of information in consciousness — our ability to perceive more than meets the eye, and to apprehend complex categorical and temporal information in a single highly-cognized glance. This superposition in experience matches a superposition of representational content in distributed representations.
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  • 8
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    Minds and machines 5 (1995), S. 219-242 
    ISSN: 1572-8641
    Keywords: Explicit ; implicit ; connectionism ; representation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Philosophy
    Notes: Abstract Much of traditional AI exemplifies the “explicit representation” paradigm, and during the late 1980's a heated debate arose between the classical and connectionist camps as to whether beliefs and rules receive an explicit or implicit representation in human cognition. In a recent paper, Kirsh (1990) questions the coherence of the fundamental distinction underlying this debate. He argues that our basic intuitions concerning ‘explicit’ and ‘implicit’ representations are not only confused but inconsistent. Ultimately, Kirsh proposes a new formulation of the distinction, based upon the criterion ofconstant time processing. The present paper examines Kirsh's claims. It is argued that Kirsh fails to demonstrate that our usage of ‘explicit’ and ‘implicit’ is seriously confused or inconsistent. Furthermore, it is argued that Kirsh's new formulation of the explicit-implicit distinction is excessively stringent, in that it banishes virtually all sentences of natural language from the realm of explicit representation. By contrast, the present paper proposes definitions for ‘explicit’ and ‘implicit’ which preserve most of our strong intuitions concerning straightforward uses of these terms. It is also argued that the distinction delineated here sustains the meaningfulness of the abovementioned debate between classicists and connectionists.
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  • 9
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    Minds and machines 6 (1996), S. 159-172 
    ISSN: 1572-8641
    Keywords: Compositionality ; connectionism ; functionalism ; language of thought ; systematicity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Philosophy
    Notes: Abstract The paper examines an alleged distinction claimed to exist by Van Gelder between two different, but equally acceptable ways of accounting for the systematicity of cognitive output (two “varieties of compositionality”): “concatenative compositionality” vs. “functional compositionality.” The second is supposed to provide an explanation alternative to the Language of Thought Hypothesis. I contend that, if the definition of “concatenative compositionality” is taken in a different way from the official one given by Van Gelder (but one suggested by some of his formulations) then there is indeed a different sort of compositionality; however, the second variety is not an alternative to the language of thought in that case. On the other hand, if the concept of concatenative compositionality is taken in a different way, along the lines of Van Gelder's explicit definition, then there is no reason to think that there is an alternative way of explaining systematicity.
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  • 10
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    Minds and machines 8 (1998), S. 161-179 
    ISSN: 1572-8641
    Keywords: connectionism ; distributed representation ; frame problem ; systematicity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Philosophy
    Notes: Abstract This paper investigates connectionism's potential to solve the frame problem. The frame problem arises in the context of modelling the human ability to see the relevant consequences of events in a situation. It has been claimed to be unsolvable for classical cognitive science, but easily manageable for connectionism. We will focus on a representational approach to the frame problem which advocates the use of intrinsic representations. We argue that although connectionism's distributed representations may look promising from this perspective, doubts can be raised about the potential of distributed representations to allow large amounts of complexly structured information to be adequately encoded and processed. It is questionable whether connectionist models that are claimed to effectively represent structured information can be scaled up to a realistic extent. We conclude that the frame problem provides a difficulty to connectionism that is no less serious than the obstacle it constitutes for classical cognitive science.
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  • 11
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    Minds and machines 9 (1999), S. 383-398 
    ISSN: 1572-8641
    Keywords: classicism ; connectionism ; Klein group ; learning transfer ; normalization ; systematicity ; weight sharing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Philosophy
    Notes: Abstract Minds are said to be systematic: the capacity to entertain certain thoughts confers to other related thoughts. Although an important property of human cognition, its implication for cognitive architecture has been less than clear. In part, the uncertainty is due to lack of precise accounts on the degree to which cognition is systematic. However, a recent study on learning transfer provides one clear example. This study is used here to compare transfer in humans and feedforward networks. Simulations and analysis show, that while feedforward networks with shared weights are capable of exhibiting transfer, they cannot support the same degree of transfer as humans. One interpretation of these results is that common connectionist models lack explicit internal representations permitting rapid learning.
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  • 12
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    Minds and machines 9 (1999), S. 197-221 
    ISSN: 1572-8641
    Keywords: cognitive architecture ; connectionism ; skills ; modules
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Philosophy
    Notes: Abstract In the late 1980s, there were many who heralded the emergence of connectionism as a new paradigm – one which would eventually displace the classically symbolic methods then dominant in AI and Cognitive Science. At present, there remain influential connectionists who continue to defend connectionism as a more realistic paradigm for modeling cognition, at all levels of abstraction, than the classical methods of AI. Not infrequently, one encounters arguments along these lines: given what we know about neurophysiology, it is just not plausible to suppose that our brains are digital computers. Thus, they could not support a classical architecture. I argue here for a middle ground between connectionism and classicism. I assume, for argument's sake, that some form(s) of connectionism can provide reasonably approximate models – at least for lower-level cognitive processes. Given this assumption, I argue on theoretical and empirical grounds that most human mental skills must reside in separate connectionist modules or ‘sub-networks’. Ultimately, it is argued that the basic tenets of connectionism, in conjunction with the fact that humans often employ novel combinations of skill modules in rule following and problem solving, lead to the plausible conclusion that, in certain domains, high level cognition requires some form of classical architecture. During the course of argument, it emerges that only an architecture with classical structure could support the novel patterns of information flow and interaction that would exist among the relevant set of modules. Such a classical architecture might very well reside in the abstract levels of a hybrid system whose lower-level modules are purely connectionist.
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  • 13
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    Mathematical programming 69 (1995), S. 443-448 
    ISSN: 1436-4646
    Keywords: Global optimization ; Discrete optimization ; Algorithm complexity ; Random search ; Markov chains
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract Pure Adaptive Search is a stochastic algorithm which has been analyzed for continuous global optimization. When a uniform distribution is used in PAS, it has been shown to have complexity which is linear in dimension. We define strong and weak variations of PAS in the setting of finite global optimization and prove analogous results. In particular, for then-dimensional lattice {1,⋯,k} n , the expected number of iterations to find the global optimum is linear inn. Many discrete combinatorial optimization problems, although having intractably large domains, have quite small ranges. The strong version of PAS for all problems, and the weak version of PAS for a limited class of problems, has complexity the order of the size of the range.
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  • 14
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    Mathematical programming 81 (1998), S. 127-146 
    ISSN: 1436-4646
    Keywords: Global optimization ; Lipschitzean first derivatives ; Numerical algorithms ; Convergence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract In this paper new global optimization algorithms are proposed for solving problems where the objective function is univariate and has Lipschitzean first derivatives. To solve this problem, smooth auxiliary functions, which are adaptively improved during the course of the search, are constructed. Three new algorithms are introduced: the first used the exact a priori known Lipschitz constant for derivatives; the second, when this constant is unknown, estimates it during the course of the search and finally, the last method uses neither the exact global Lipschitz constant nor its estimate but instead adaptively estimates the local Lipschitz constants in different sectors of the search region during the course of optimization. Convergence conditions of the methods are investigated from a general viewpoint and some numerical results are also given. © 1998 The Mathematical Programming Society, Inc. Published by Elsevier Science B.V.
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  • 15
    ISSN: 1573-0832
    Keywords: Africa ; Fusarium ; F. moniliforme ; grain ; Lesotho ; mating population ; Nigeria ; taxonomy ; Zimbabwe
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Several Fusarium species have been found associated with millet and sorghum in Nigeria, Lesotho and Zimbabwe. Amongst these, some isolates were originally identified as short- and long-chained types of F. nygamai. However, there was some question as to the correct identification of the long chained types. This study reclassified some of the isolates with long microconidial chains as F. moniliforme. Morphologically, these strains do not produce chlamydospores like F. nygamai, but produce swollen hyphal cells or resistant hyphae. The isolates in this study were crossed with the mating-type tester strains of Gibberella fujikuroi (F. moniliforme and G. nygamai (F. nygamai). Of the isolates with long chains of microconidia and other characteristics of F. moniliforme, 36% crossed with mating population ''A'' of G. fujikuroi. Of the isolates with characteristics of F. nygamai, 65% crossed with the testers used to produce the teleomorph of F. nygamai. Mating tests support the separation of the sample population into F. moniliforme and F. nygamai. The results of this study show that genetics can be an aid in resolving some problems in fungal taxonomy.
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  • 16
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    Antonie van Leeuwenhoek 71 (1997), S. 375-378 
    ISSN: 1572-9699
    Keywords: Candida novakii ; taxonomy ; yeasts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two strains of an undescribed species of the genus Candida were isolated from decaying wood of Quercus sp. A description of the new species Candida novakii is given.
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  • 17
    ISSN: 1572-9699
    Keywords: phylogeny ; prosthecobacter ; taxonomy ; Verrucomicrobia ; Verrucomicrobiae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Four strains of nonmotile, prosthecate bacteria were isolated in the 1970s and assigned to the genus Prosthecobacter. These strains were compared genotypically by DNA/DNA reassociation and 16S rDNA based phylogenetic analyses. Genotypic comparisons were complemented with phenotypic characterizations. Together, these studies clearly indicate each Prosthecobacter strain represents a novel species of bacteria. We propose three new species of Prosthecobacter, P. dejongeii strain FC1, P. vanneervenii strain FC2, and P. debontii strain FC3; P. fusiformis is reserved for the type strain of the genus, strain FC4. Additionally, we propose the genera Prosthecobacter and Verrucomicrobium, currently members of the order Verrucomicrobiales, to comprise a novel higher order taxonomic group, the division Verrucomicrobia div. nov. and the class Verrumicrobiae class nov. Many novel members of the Verrucomicrobia, as revealed by molecular ecology studies, await isolation and description.
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  • 18
    ISSN: 1572-9699
    Keywords: keratinophilic fungi ; Neoarachnotheca ; Neoarachnotheca keratinophila ; Nannizziopsis tropicalis ; Onygenales ; taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Neoarachnotheca is proposed as a new genus of Onygenales. The outstanding generic characteristics are white, spherical ascomata with a wall formed by a network of hyphae and spherical, subhyaline ascospores with an irregular sheath. Nt. keratinophila, the type species, characterized by wavy peridial hyphae has been isolated from marine and river sediments and Myriodontium keratinophilum is its anamorph. Nannizziopsis tropicalis is proposed as a new species based on a strain isolated from soil in Burundi. RFLPs analysis of ITS and 5.8S rDNA support these proposals. The differences with related genera are discussed.
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  • 19
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    Antonie van Leeuwenhoek 74 (1998), S. 229-235 
    ISSN: 1572-9699
    Keywords: Dipodascus capitatus ; D.spicifer ; Geotrichum clavatum ; yeast ; taxonomy ; DNA heterogeneity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The G+C contents of 25 strains of Dipodascus capitatus, Dipodascus spicifer and Geotrichum clavatum were found to be heterogeneous on basis of derivative graphs of the melting profiles. Strains showing similar derivative graphs of the melting curve exhibited high levels of DNA homology (80-100%); strains showing dissimilar derivative graphs exhibited low levels of DNA homology (5 to 45%). Being considered separate taxa on basis of these parameters, D. capitatus, D. spicifer and G. clavatum could be identified by a combination of the key characteristics growth on xylose, cellobiose, salicin and arbutin.
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  • 20
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    Plant molecular biology reporter 16 (1998), S. 147-155 
    ISSN: 1572-9818
    Keywords: allele-specific PCR ; Beta ; ITS1 ; plant identification ; rDNA ; taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Sequence variation in the ITS1 locus of the nuclear ribosomal DNA in beets has previously been used to reconstruct phylogeny of the species in the genus Beta. We have developed protocols that allow the identification of Beta taxa by use of taxon-specific primers. Beta sections, species and subspecies can be identified. Differences within the ITS1 region of a single base can be exploited for species identification. The results from this study not only provide effective methods for wild beet identification, but also indicate the potential use of the techniques in other crops.
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  • 21
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    Journal of insect conservation 2 (1998), S. 151-159 
    ISSN: 1572-9753
    Keywords: Orthoptera ; biodiversity ; taxonomy ; conservation.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Nature of Science, Research, Systems of Higher Education, Museum Science
    Notes: Abstract It is estimated that only 10–15% of the world's insect fauna has been described and named. Efforts to inventory insect biodiversity are hampered by this taxonomic impediment, which is compounded by the logistical problems of an insufficient taxonomic workforce and their remote location in museums thousands of miles from the areas of highest biodiversity. Compared to most other invertebrate groups however, the taxonomic impediment is relatively benign in the order Orthoptera. This is a small to medium-sized order (approximately 20 000 described species) which is well known taxonomically, owing to the group's agricultural importance worldwide. Furthermore, orthopteran taxonomists are now fortunate to have a published up-to-date catalogue of all known species, which has just become accessible as a regularly updated database on the World Wide Web. Whilst new information technology, in the form of e-mail networks, World Wide Web sites and CD-ROM information archives, is already enhancing communication between specialists and helping to reduce the logistical problems of documenting orthopteran biodiversity, a major reinvestment in basic taxonomic research is needed if we are to reduce the existing taxonomic impediment significantly. There is general agreement that an internationally coordinated approach will be necessary and priorities must be set to tackle the biodiversity/systematics crisis. In the future, the Orthoptera can make an important contribution to invertebrate faunal surveys and have potential as an indicator taxon. Furthermore, the Orthoptera Species File establishes a taxonomic framework which could be readily enlarged to include geographic data and phenology of species from existing museum specimens.
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  • 22
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    Journal of the history of biology 32 (1999), S. 3-30 
    ISSN: 1573-0387
    Keywords: Darwin ; Aristotle ; Ogle ; Linnaeus ; Cuvier ; teleology ; classification ; functional explanation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , History
    Notes: Abstract Charles Darwin's famous 1882 letter, in response to a gift by his friend, William Ogle of Ogle's recent translation of Aristotle's Parts of Animals, in which Darwin remarks that his “two gods,” Linnaeus and Cuvier, were “mere school-boys to old Aristotle,” has been thought to be only an extravagantly worded gesture of politeness. However, a close examination of this and other Darwin letters, and of references to Aristotle in Darwin's earlier work, shows that the famous letter was written several weeks after a first, polite letter of thanks, and was carefully formulated and literally meant. Indeed, it reflected an authentic, and substantial, increase in Darwin's already high respect for Aristotle, as a result of a careful reading both of Ogle's Introduction and of more or less the portion of Ogle's translation which Darwin says he has read. Aristotle's promotion to the pantheon, as an examination of the basis for Darwin's admiration of Linnaeus and Cuvier suggests, was most likely the result specifically of Darwin's late discovery that the man he already knew as “one of the greatest ... observers that ever lived” (1879) was also the ancient equivalent both of the great modern systematist and of the great modern advocate of comparative functional explanation. It may also have reflected some real insight on Darwin's part into the teleological aspect of Aristotle's thought, indeed more insight than Ogle himself had achieved, as a portion of their correspondence reveals.
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  • 23
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    Journal of the history of biology 32 (1999), S. 509-555 
    ISSN: 1573-0387
    Keywords: Louis Agassiz ; Spencer Baird ; Charles Girard ; reputation ; taxonomy ; ichthyology ; Museum of Comparative Zoology ; Smithsonian Institution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , History
    Notes: Abstract The reputations of scientists among their contemporaries depend not only on accomplishment, but also on interactions affected by influence and personality. The historical lore of most fields of scientific endeavor preserve these reputations, often through the identification of founders, innovators, and prolific workers whose contributions are considered fundamental to progress in the field. Historians frequently rely on the historical lore of scientists to guide their studies of the development of ideas, exhibiting justifiable caution in reassessing reputations in the light of current knowledge. However, the transmission of historical lore can obscure the relative importance of accomplishment, influence and personality in shaping contemporary reputations, leaving the historian to either accept reputations at face value or attempt to reconstruct the context in which they were created. The science of taxonomy, because of its rules of priority, leaves a relatively accurate record of historical accomplishment through the persistence of taxa in catalogues and faunal guides. These records allow the modern historian an unbiased means to assess the relative accomplishments of historical figures and therefore a means to critically reassess reputations independent of personality and influence. In the historical lore of North American ichthyology, Louis Agassiz at Harvard and Spencer Baird at the Smithsonian emerge as central figures in the early development of the field during the mid-1800s, contributing not only through the quality and quantity of their science, but also through their roles as institutional leaders and mentors to workers who followed. Charles Girard, originally a student of Agassiz's and later a coworker with Baird, receives little notice in the history of ichthyology, and his reputation is that of a minor player in the initial description of the North American fish fauna, and one whose work appears to have been flawed or even careless when compared to his contemporaries. However, a review of both contemporary and modern taxonomic works reveals that Girard's productivity far exceeded that of either Agassiz or Baird. Furthermore, an examination of the tendency of Girard and his contemporaries to introduce synonymous names into the literature, which might reflect careless or uncritical work, suggests that Girard was among the more accomplished workers of hisera, including Agassiz and Baird. Girard's low ranking in the folklore of North American ichthyology, therefore, can not be attributed to discernible shortcomings in his scientific work, but rather to a public and private campaign of criticism waged by Agassiz after Girard's departure from Harvard. While Agassiz's dispute with Girard stemmed from their personal interactions, he expressed them as criticisms of Girard's work, and thus helped shape Girard's scientific reputation as it has been transmitted through the lore of ichthyology. This case study reveals how scientific reputation may not always rest on accomplishment, but can be influenced by personal interactions obscured by time but nonetheless important to history.
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  • 24
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    Applied mathematics & optimization 34 (1996), S. 161-182 
    ISSN: 1432-0606
    Keywords: Global optimization ; Quadratic cost ; Quadratic equality constraints ; Multivariate polynomials ; Resultants ; 49N99 ; 90C26 ; 90C30 ; 65K05
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In the area of broad-band antenna array signal processing, the global minimum of a quadratic equality constrained quadratic cost minimization problem is often required. The problem posed is usually characterized by a large optimization space (around 50–90 tuples), a large number of linear equality constraints, and a few quadratic equality constraints each having very low rank quadratic constraint matrices. Two main difficulties arise in this class of problem. Firstly, the feasibility region is nonconvex and multiple local minima abound. This makes conventional numerical search techniques unattractive as they are unable to locate the global optimum consistently (unless a finite search area is specified). Secondly, the large optimization space makes the use of decision-method algorithms for the theory of the reals unattractive. This is because these algorithms involve the solution of the roots of univariate polynomials of order to the square of the optimization space. In this paper we present a new algorithm which exploits the structure of the constraints to reduce the optimization space to a more manageable size. The new algorithm relies on linear-algebra concepts, basic optimization theory, and a multivariate polynomial root-solving tool often used by decision-method algorithms.
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    Journal of industrial microbiology and biotechnology 17 (1996), S. 328-345 
    ISSN: 1476-5535
    Keywords: hyphomycetes ; ascomycetes ; taxonomy ; ecology ; stream biology
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    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract There are more than 600 species of freshwater fungi with more known from temperate, as compared to tropical regions. These includeca 340 ascomycetes, 300 deuteromycetes, and a number of lower fungi which are not discussed here.Aniptodera, Annulatascus, Massarina, Ophioceras andPseudohalonectria are common freshwater ascomycetes, which appear to be well adapted for this lifestyle either in their ascospore types or their competitive-degradative characters. The most common genera of wood-inhabiting deuteromycetes includeCancellidium, Dactylaria, Dictyosporium andHelicomyces. They are categorized into four groups depending on their form and life style: the ingoldian hyphomycetes; the aero-aquatic hyphomycetes; the terrestrial-aquatic hyphomycetes; and the submerged-aquatic hyphomycetes. The adaptations of aquatic fungi for their dispersal and subsequent attachment to new substrates are discussed.
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    Journal of classification 13 (1996), S. 3-18 
    ISSN: 1432-1343
    Keywords: Unidimensional scaling ; Seriation ; Local minima ; Global optimization ; Smoothing technique ; Multidimensional scaling
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    Topics: Mathematics
    Notes: Abstract For the problem of metric unidimensional scaling, the number of local minima is estimated. For locating the globally optimal solution we develop an approach, called the “smoothing technique.” Although not guaranteed inevitably to locate the global optimum, the smoothing technique did so in all computational experiments where the global optimum was known.
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  • 27
    ISSN: 1618-2545
    Keywords: Bruguiera gymnorrhiza ; ecology ; Lanceispora amphibia ; mangrove ; taxonomy
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    Topics: Biology
    Notes: Abstract Lanceispora amphibia gen. et sp. nov. in the Amphisphaeriaceae is described from senescent and fallen leaves ofBruguiera gymnorrhiza in mangrove forests in the Southwest Islands, Japan. The fungus produces immersed ascomata in leaf tissue, cylindrical asci with an apical ring staining blue with iodine, and oblanceolate ascospores with a septum above the middle. Studies on the fungal succession on the mangrove leaves revealed thatL. amphibia infects senescent leaves on the tree and inhabits intertidal fallen leaves, showing the highest frequency of occurrence at the late stage of decomposition. In culture the optimal conditions for hyphal growth were 20 ppt salinity and 30°C, and those for sexual reproduction were 10 ppt salinity and 25°C. Growth at 0 ppt (fresh water) was depressed. The fungus has amphibious habits, growing on the tree and in intertidal water; and it is adapted to the high osmotic conditions in leaf tissues of the mangrove tree and to the subtropical, brackish water environment of mangrove forests.
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  • 28
    ISSN: 1618-2545
    Keywords: Bauhinus ; Microbotryum ; taxonomy ; Ustilago ; ustomycetes
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    Topics: Biology
    Notes: Abstract A study of the type specimen ofUstilago jehudana resulted in the correction of the diagnosis. The sori are localized in the host gynoecium but not in the anthers. Morphological characters of the sori and ustospores of the later describedU. moenchiae-manticae are identical with these ofU. jehudana. Ustilago moenchiae-manticae is reduced here to a synonym ofU. jehudana. The smut is reported as new to Bulgaria on a new host, viz.,Moenchia erecta. A new combination,Bauhinus jehudanus, is proposed.
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  • 29
    ISSN: 1618-2545
    Keywords: Aphyllophorales ; ribosomalDNA ; synnematous hyphomycete ; taxonomy ; Tretopileus sphaerophorus
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    Topics: Biology
    Notes: Abstract Tretopileus sphaerophorus, a synnematous hyphomycete with basidiomycetous affinities was newly isolated from the decaying petiole and peduncle ofCocos nucifera collected in Depok, Indonesia. The species produced first a bulbil as a propagule on the top of a synnema. After the bulbil had fallen, the synnema proliferated about seven times to produce new bulbils, each time making conspicuous nodes at the upper part. By careful morphological observation, clamp connections were confirmed on the hyphae in the specimens and culture. In culture, each hyphal cell with or without a clamp was found to be dikaryotic by DAPI nuclear staining. Germination of the bulbils occurred first from projecting hyphal tips on their upper surface, which have been treated as germ pores. The inner structure of the bulbils, the hyaline mucus of the bulbils, and conidium-like hyphal fragments were also examined. Phylogenetically,T. sphaerophorus was inferred to be related to the Aphyllophorales based on the nuclear encoded small subunit (18S) rDNA using the homology search system (FASTA) and the neighbour-joining method.
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    Mycoscience 39 (1998), S. 97-104 
    ISSN: 1618-2545
    Keywords: Loculoascomycetes ; phyllachoraceae ; phyllachorales ; taxonomy
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    Topics: Biology
    Notes: Abstract The order Phyllachorales contains ascomycetous fungi of considerable economic importance. The group is represented mostly by foliar parasites which produce perithecia under a clypeus, inside a stroma, or do not produce any stromatic tissue. A major taxonomic problem with this order is the lack of reliable morphological characters that clearly delimit the entire group. The main purpose of this review is to provide a clear picture of the taxonomic relationships of the order Phyllachorales, along with a key to the most important genera in the family Phyllachoraceae.
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    Mycoscience 40 (1999), S. 73-80 
    ISSN: 1618-2545
    Keywords: Mycena auricoma ; Mycena sect.Radiatae ; Mycena spinosissima ; taxonomy
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    Topics: Biology
    Notes: Abstract Two lignicolous species ofMycena (Agaricales, Basidiomycetes) are described and illustrated from eastern, Japan:Mycena auricoma sp. nov., forming ephemeral coprinoid basidiomata and belonging to sectionRadiatae, was found on a dead fallen twig ofQuercus serrata. It appears to close to a Malaysian species,“Trogia” crinipelliformis. Mycena spinosissima in sectionSacchariferae, new to Japan, was collected from dead bark ofAphananthe aspera, a dead fallen inflorescence ofCryptomeria japonica, and a dead fallen twig ofQuercus serrata.
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  • 32
    ISSN: 1618-2545
    Keywords: cellular slime molds ; dictyostelids ; macrocyst ; mating system ; taxonomy
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    Notes: Abstract Macrocyst formation in the sexual cycle was found in three dictyostelid species:Dictyostelium monochasioides, Polysphondylium candidum, andP. pseudo-candidum. Mating tests suggested thatD. monochasioides andP. pseudocandidum were heterothallic andP. candidum was homothallic. The primary walls of macrocysts had partially or fully degenerated, while the inner walls, believed to be tertiary walls, showed an undulate structure.
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    Mycoscience 36 (1995), S. 431-438 
    ISSN: 1618-2545
    Keywords: Atkinsiella dubia ; Halocrusticida ; Japan ; marine fungus ; taxonomy
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    Topics: Biology
    Notes: Abstract Atkinsiella dubia, isolated from the mantle of abalone (Haliotis sieboldii), is described and illustrated as a new record from Japan. The fungus was also obtained from the gills of swimming crab (Portunus trituberculatus). Six other species of the genusAtkinsiella have hitherto been reported from various aquatic animals. The fungus is distinguished from the other six species by the morphology of its mycelia and the process of zoospore production. The most distinctive feature is that zoospores in the first motile stage ofA. dubia encyst in zoosporangia, unlike the other species. We therefore proposeHalocrusticida gen. nov. (Lagenidiales, Haliphthoraceae) for the other six species ofAtkinsiella. A key to species of the genusHalocrusticida is provided.
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    Mycoscience 37 (1996), S. 173-185 
    ISSN: 1618-2545
    Keywords: Geminago ; Geminago nonveilleri ; Mycosyrinx ; taxonomy ; Ustilaginales
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    Topics: Biology
    Notes: Abstract The revision of the genusMycosyrinx resulted in the recognition of three species, all on Vitaceae:M. cissi (type onCissus sicyoides), M. arabica (type onCissus quadrangularis), andM. microspora (type onCissus afzelii), and in the description of a new genus. After a short historical review, the genusMycosyrinx is characterized and descriptions, synonyms, ilustrations, and a key are given for the three recognizedMycosyrinx species.Mycosyrinx globosa (nomen nudum, onCissus sp.) is considered to be immatureM. microspora. Lectotype is selected forSchizonella colemani (=M. arabica). A short characterization is given for the generaSchizonella andUstacystis and they are compared withMycosyrinx andSchroeteria. ForM. nonveilleri (type onTriplochiton scleroxylon, Sterculiaceae) a new genus,Geminago, is proposed. A key to the pair-spored genera of Ustilaginales is given.Mycosyrinx osmundae (type onOsmunda regalis, Pteridophyta, Osmundaceae) and its var.cinnamomae are excluded fromMycosyrinx.
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    Mycoscience 37 (1996), S. 255-259 
    ISSN: 1618-2545
    Keywords: cleistothecial ascomycete ; Lasiobolidium gracile ; soil fungus ; taxonomy ; USA
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    Topics: Biology
    Notes: Abstract Lasiobolidium gracile isolated from a soil sample collected from California, USA is described as a new species. This species is characterized by yellowish brown to reddish brown, nonostiolate ascomata with numerous, long straight appendages and a translucent peridium, subglobose to broadly clavate asci, hyaline to pale yellowish brown, ellipsoidal ascospores. It differs from the other species ofLasiobolidium in the straight and narrow appendages and the large ascospores. A key is presented separating the seven known species.
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  • 36
    ISSN: 1618-2545
    Keywords: Chaetomidium ; Chaetomidium heterotrichum ; cladistic analysis ; systematics ; taxonomy
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    Topics: Biology
    Notes: Abstract A species of the genusChaetomidium was isolated from fallen leaves of an unknown tree during a mycofloral survey of materials from the ‘Gran Sabana’ region in Southeastern Venezuela. The species was identified asC. heterotrichum. Identification was based on the perithecium lacking a neck and ostiole, the peridium being composed of textura angularis cells, the perithecium being covered with hairs and setae at the apex, and by 4-spored asci containing uniporate ascospores. The anamorph was intermediate betweenChalara andAcremonium sect.Chaetomioides. This is the first report of this species in Venezuela and only the second timeC. heterotrichum has been found. An illustrated description ofC. heterotrichum and a key to eight recognized species ofChaetomidium, based on morphological characters in the literature, are provided. The results of a cladistic analysis of 12 available morphological characters of the genus revealed two main groups, each based on the two characters ‘ascospore shape’ and ‘peridial wall type’. The ascomatal hairs had little influence on the species grouping. With the exception ofC. heterotrichum, the remaining species ofChaetomidium were monophyletically supported in 73% of the bootstrap replicates.Chaetomidium heterotrichum was the basal ingroup taxon and formed a sister group to the other species in the genus.
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    Mycoscience 38 (1997), S. 55-69 
    ISSN: 1618-2545
    Keywords: discomycetes ; ITS rDNA phylogeny ; morphology ; taxonomy
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    Topics: Biology
    Notes: Abstract The systematics ofScleromitrula andVerpatinia of the family Sclerotiniaceae is reevaluated on the basis of morphological, cultural and molecular criteria.Scleromitrula shiraiana, Verpatinia species andCiborinia candolleana share gross morphological, microanatomical and cultural features which clearly distinguish them from the closely relatedCiborinia andRutstroemia species. Phylogenetic analyses of sequences from the internal transcribed spacer region (ITS1, ITS2, and the 5.8S gene) of nuclear ribosomal DNA demonstrate that the stipitate-capitate specimens ofScleromitrula andVerpatinia species plus the stipitate-cupulateCiborinia candolleana constitute a monophyletic clade separate from a clade including the type species ofCiborinia. Scleromitrula is emended to includeS. shiraiana, the new speciesS. rubicola, C. candolleana, and specimens formerly assigned toVerpatinia. A key to the accepted species ofScleromitrula is provided.
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    Mycoscience 38 (1997), S. 71-73 
    ISSN: 1618-2545
    Keywords: Ceratobasidiaceae ; Japan ; taxonomy ; Ypsilonidium bananisporum
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    Topics: Biology
    Notes: Abstract Ypsilonidium bananisporum sp. nov. belonging to Ceratobasidiales is described and illustrated. This fungus has all the characteristics of the genusYpsilonidium including reticulate-hypochnoid basidiomes, broad hyphae branching at right angles, broadly clavate basidia with two sterigmata, and basidiospores germinating by repetition. It differs from all hitherto known species in the genus by producing suballantoid to banana-shaped basidiospores, measuring 19.5–22×5.5–6 μm.
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    Mycoscience 38 (1997), S. 87-89 
    ISSN: 1618-2545
    Keywords: Israel ; Mycomycetes ; Physarales ; Stemonitales ; taxonomy
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    Topics: Biology
    Notes: Abstract Ten taxa of myxomycetes growing mainly withEucalyptus, oak and pine are described. They were found in Upper Galilee, Mt. Carmel and Central parts of the country and all are new to Israel.
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  • 40
    ISSN: 1618-2545
    Keywords: hyphomycetes ; identification ; taxonomy ; Tuberculariaceae ; Tuberculariales
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    Topics: Biology
    Notes: Abstract Mycoleptodiscus terrestris from black pepper roots in the Dominican Republic is described together with some notes and photomicrographs.
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    Mycoscience 38 (1997), S. 429-431 
    ISSN: 1618-2545
    Keywords: coelomycete ; Japan ; Microsphaeropsis rugospora ; soil fungus ; taxonomy
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    Topics: Biology
    Description / Table of Contents: Abstract In an exploratory survey of soil-borne mitosporic fungi as producers of secondary metabolites useful to the pharmaceutical industry, a pale yellow pycnidial coelomycete was encountered and isolated on potato-dextrose agar. The fungus was characterized as follows: rapid growth on common media, conidiomata which are non-pulvinate, semi-immersed to immersed, nearly globose, glabrous, with a slightly papillate ostiole; pale yellowish brown, translucent, membranaceous peridium; discrete, ampulliform, monophialidic conidiogenous cells; and onecelled, dark brown, globose, thick-walled, rugose conidia which germinate very easily. In accordance with this profile, our isolate is included in the genusMicrosphaeropsis Höhnel. (Morgan-Jones, 1974a, b; Sutton, 1977, 1980; Morgan-Jones and White, 1987; Heiny et al., 1992; Katumoto, 1992). However, it proved to be sufficiently different from all described species ofMicrosphaeropsis to warrant its description as a new species.
    Notes: Abstract A new species ofMicrosphaeropsis (Sphaeropsidales, Coelomycetes),M. rugospora, is described and illustrated. This fungus is characterized by its rapid growth on common media such as oatmeal and potato-carrot agars; semi-immersed to immersed, nearly globose, papillate pycnidias; pale yellowish brown, translucent, membranaceous peridium; monophialidic, ampulliform conidiogenous cells; and one-celled, dark brown, globose conidia ornamented with distinct tubercles. The holotype was isolated from the cultivated soil in Tanegashima Island, southern Japan.
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    Mycoscience 39 (1998), S. 31-36 
    ISSN: 1618-2545
    Keywords: Mycogloea ; Platygloea ; Platygloeaceae ; Platygloeales ; taxonomy
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    Notes: Abstract Three new species ofMycogloea are described and illustrated; they are:M. amethystina from Canada,M. nipponica, from Japan, andM. bullata from Thailand.Mycogloea tahitiensis is reported from Japan and additional undescribed taxa in the genus are briefly noted. Some characteristics of the genus are discussed, and a key is provided for six species recognized at this time.
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    Mycoscience 40 (1999), S. 189-191 
    ISSN: 1618-2545
    Keywords: bamboo fungus ; hyperparasitism ; hyphomycetes ; mycoparasites ; taxonomy
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    Topics: Biology
    Notes: Abstract Cryptophiale sphaerospora sp. nov. is described and illustrated based on a single collection attached to a synnematous fungus,Janetia synnematosa, from a dead bamboo culm. It differs from other species ofCryptophiala in having spherical to subspherical conidia and a cerebroid layer of phialides. The overall morohology of this species is smaller than that of previously described species.
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    Plant systematics and evolution 198 (1995), S. 179-194 
    ISSN: 1615-6110
    Keywords: Fabaceae ; Vicia sect.Faba ; Electrophoresis ; seed albumins ; taxonomy
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    Topics: Biology
    Notes: Abstract Electrophoretic analysis of seed albumins (PAGE) covered 173 accessions representing nine species ofVicia sect.Faba. The number of albumin bands recorded in particular species varied from three inV. eristaloides to 23 inV. faba; in total, 38 bands were distinguished in the investigated material. The examined species, exceptV. eristalioides, showed intraspecific variation with respect to the number and relative staining intensity of albumin bands; individual variation was especially marked inV. faba and inV. narbonensis. Hierarchical clustering of the investigated taxa was based onBhattacharyya distances calculated from the electrophoretic data. The taxa grouped in three main clusters.Vicia faba and the rather remotely relatedV. kalakhensis formed one cluster. The second cluster was composed ofV. narbonensis distantly related toV. hyaeniscyamus. The third cluster comprised three subgroups: 1.V. johannis, V. galilaea andV. serratifolia, 2.V. eristalioides, and 3.V. bithynica. The obtained results are discussed with reference to taxonomic relationships inVicia sect.Faba.
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    Plant systematics and evolution 199 (1996), S. 109-120 
    ISSN: 1615-6110
    Keywords: Lamiaceae ; Scutellaria sect.Resinosa ; SEM ; nutlet sculpturing ; micromorphology ; taxonomy
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    Topics: Biology
    Notes: Abstract Nutlet sculpturing of 22 taxa ofScutellaria sect.Resinosa, representing 18 of its 19 species, and the monotypic genusSalazaria was studied by scanning electron microscopy (SEM). The nutlets of sect.Resinosa, while remarkably variable among themselves, differed from hypothetically closely related sections in lacking circumferential banding and sessile glands. Species could be grouped by surface sculpturing into seemingly meaningful phenetic clusters.Scutellaria potosina var.platyphylla was sufficiently distinct micromorphically so as to be elevated to specific status asScutellaria platyphylla comb. and stat. nov. The significance of nutlet microcharacters within sect.Resinosa is discussed, especially as compared to closely related sections. The genusSalazaria had nutlet sculpturing quite different from all taxa belonging to sect.Resinosa.
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    Plant systematics and evolution 199 (1996), S. 243-258 
    ISSN: 1615-6110
    Keywords: Eriocaulaceae ; Leiothrix crassifolia (L. nubigena, L. obtusifolia) ; Morphological and anatomical variation ; geographical differentiation ; taxonomy ; Flora of ‘campos rupestres’ ; Brazil
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    Notes: Abstract The morphological and anatomical leaf and scape differentiation ofLeiothrix crassifolia is analysed and classified into seven types (I, II, III, IV, V, VI, VII). The species has a relatively wide distribution in the campo rupestre of Minas Gerais in Brazil. Variation in the isolated populations on different mountain ranges is complex, does not follow a clear geographical pattern, and defies taxonomic classification.L. nubigena andL. obtusifolia are included inL. crassifolia.
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  • 47
    ISSN: 1615-6110
    Keywords: Rosaceae ; Rosa sect.Caninae ; Systematics ; taxonomy ; genetic variation ; hemisexual ; apomixis
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    Notes: Abstract Difficulties in delimiting well-defined entities in the dogroses (Rosa sect.Caninae) has resulted in very variable taxonomic treatments. The present study was undertaken to provide a background for taxonomy as well as plant breeding. Morphometric diversity was analysed on seedlings obtained from field collections in South Sweden of three species,Rosa dumalis, R. rubiginosa andR. villosa. A canonical variates analysis showed that the three species are relatively distinct whereas two subspecies ofR. dumalis were less well discriminated. Analyses of variance demonstrated that intraspecific variation is pronounced inR. dumalis and, to a lesser extent, inR. villosa.
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    Plant systematics and evolution 205 (1997), S. 241-264 
    ISSN: 1615-6110
    Keywords: Boraginaceae ; Boragineae ; Anchusella ; A. variegata ; A. cretica ; Lycopsis ; Anchusa ; Mediterranean flora ; macromorphology ; micromorphology ; karyology ; taxonomy
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    Notes: Abstract The two closely related speciesLycopsis variegata andAnchusa cretica, formerly placed inAnchusa subg.Rivinia, were compared with the type species ofLycopsis andAnchusa, on the basis of a set of macro and microcharacters. The presence of only two fertile stamens as well as other peculiar characters in flower structure, androecium, gynoecium, pollen and fruit, supports the institution of the new genusAnchusella, consisting ofA. variegata andA. cretica. Karyological and eco-chorological aspects are consistent with morphological data in pointing to the autonomy of this genus, which appears characterized by autapomorphic, advanced traits.
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    Plant systematics and evolution 208 (1997), S. 1-9 
    ISSN: 1615-6110
    Keywords: Fabaceae ; Vicia faba ; V. kalakhensis ; Seed albumins ; HPLC ; taxonomy
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    Topics: Biology
    Notes: Abstract Previously reported electrophoretic seed albumin data have shown an unexpected association ofVicia faba withV. kalakhensis. In the present work, seed albumins ofV. faba (subsp.paucijuga and subsp.faba) were compared with those ofV. kalakhensis using ionexchange (IE) and reversed-phase (RP) high-performance liquid chromatography (HPLC). Two subspecies ofV. faba displayed similar seed albumin profiles. On the other hand, seed albumin profiles ofV. faba andV. kalakhensis showed no major protein peak in common either in IE-HPLC or RP-HPLC chromatograms. The reported differences in seed albumin composition ofV. faba andV. kalakhensis are consistent with other taxonomical data showingV. faba to be genetically distant from the wild relatives.
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    Plant systematics and evolution 208 (1997), S. 239-248 
    ISSN: 1615-6110
    Keywords: Fabaceae ; Vicia ; sect.Hypechusa ; sect.Peregrinae ; Electrophoresis ; seed albumins ; taxonomy
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    Notes: Abstract This work is a continuation of electrophoretic investigations aimed at revealing a wild relative ofVicia faba. Electrophoretic analysis (PAGE) of seed albumins covered 52 accessions representing eightVicia species of sect.Hypechusa and two species of sect.Peregrinae. Most of the examined species showed an intraspecific variation due to differences between accessions and/or individual variation within accessions. In spite of the intraspecific variation, marked interspecific differences were recorded. However, none of the investigated species displayed electrophoretic seed albumin patterns similar to those reported earlier forV. faba. Contribution of the obtained results to characterization of the examined taxa is discussed.
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    ISSN: 1615-6110
    Keywords: Fabaceae ; Vicia faba ; trnL intron ; PCR-sequencing ; taxonomy
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    Notes: Abstract The chloroplasttrnL intron from 46 differentVicia accessions, representing five of the nine sections of the genusVicia subg.Vicia sensuMaxted (1991a) were amplified by the Polymerase Chain Reaction (PCR) using oligonucleotide primers homologous to conserved regions intrnL. The products fell into two distinct groups; those of approximately 250 nt and those of around 450 nt in length. Of these, products from 17 differentVicia species were cloned and their nucleotide sequences determined. Multiple alignments were assembled and phylogenetic trees constructed by the weighted least-squares distance method. ALathyrus latifolius trnL intron sequence was used as an outgroup. The resulting trees clearly group and separate the sectt.Narbonensis, Bithynica andFaba species but were less able to distinguish species from sectt.Hypechusa andPeregrinae. Based on these sequence data,V. faba appears to be more distant from sect.Narbonensis than sectt.Hypechusa andPeregrinae. The results are in general agreement with a recent treatment ofVicia subg.Vicia (Maxted 1993) and lend further support to placingV. faba in the monospecific sect.Faba.
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    Plant systematics and evolution 213 (1998), S. 173-186 
    ISSN: 1615-6110
    Keywords: Fabaceae ; Vicia ; sect.Bithynicae ; sect.Narbonensis ; Allozymes ; genetic diversity ; taxonomy
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    Notes: Abstract Electrophoretic analysis of five enzyme systems, LAP, PGI, SKDH, SOD and 6-PGDH, among 102Vicia accessions representingV. bithynica and seven species of theV. narbonensis complex, namelyV. eristalioides, V. kalakhensis, V. johannis, V. galilaea, V. serratifolia, V. narbonensis andV. hyaeniscyamus, has been performed. The recorded variation was tentatively assigned to 41 allelic genes at eight loci; intraspecific variation was observed in all species except forV. eristalioides. The results obtained were compared with the corresponding data reported earlier forV. faba. Hierarchical grouping of the investigated taxa, includingV. faba, was based onNei's genetic identities calculated from the allozyme frequency data.Vicia faba andV. bithynica were shown to be most distantly related to one another and to the remaining species investigated.Vicia serratifolia appeared to be a peripheral member of theV. narbonensis complex. The results are discussed with reference to genetic diversity and taxonomic relationships of the species under study.
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  • 53
    ISSN: 1615-6110
    Keywords: Bryophyta ; Mitochondria ; nad5 gene ; group I intron ; molecular phylogeny ; taxonomy
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    Notes: Abstract In contrast to animals, the slowly evolving mitochondrial nucleotide sequences of plants appear well suited to investigate phylogenetic relations between old taxonomic groups. Analysis ofnad5 gene sequences in 47 bryophytes, the living representatives of very early land plants, confirm this assessment. Statistically reliable phylogenetic trees are obtained with different mathematical approaches. A group I intron sequence conserved in thenad5 gene of all 30 mosses and 15 liverworts investigated supports a sister group relationship of the two classes. The intron sequence adds phylogenetic information for fine resolution on top of the conserved exon sequences down to the level of classically defined orders or families, respectively. This intron is not present in the hornwortsAnthoceros husnotii andA. punctatus. The results allow statements on diverging taxonomic interpretations and support the monophyly of the liverworts, mosses, Jungermanniidae, Marchantiidae and Bryidae, and allow recognition of subclasses like Hypnanae and Dicrananae. Among the mosses, the derived orders (subclass Bryidae) are confidently set apart from the Sphagnales, Andreaeales, Polytrichales and Tetraphidales with Buxbaumiales occupying a mediating position. Among the liverworts, full support is found for the classic separation of simple (jungermanniid) and complex thalloid (marchantiid) species with a strikingly low mitochondrial sequence divergence among the latter.
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    Journal of applied phycology 11 (1999), S. 411-419 
    ISSN: 1573-5176
    Keywords: Bangiales ; Porphyra life history ; culture ; conchocelis ; conchosporangia ; spores ; neutral conchospores morphology ; taxonomy
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    Notes: Abstract Since 1992, as part of a study to circumscribe the genus Porphyra in New Zealand, an extensive culture programme has been developed at the Museum of New Zealand Te Papa Tongarewa. This collection currently houses more than 800 cultures and 150strains. We currently recognise at least 20 species in New Zealand, most of which are undescribed. Close observation of reproduction and the development of conchocelis-phase filaments grown in the laboratory, under controlled conditions of temperature, irradiance and photoperiod, has enabled the recognition of characters that can assist in species separation. The comparative taxonomic value of a range of such characters is discussed, including reporting a novel reproductive mode.
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  • 55
    ISSN: 1573-5176
    Keywords: distribution ; harvesting ; Porphyra ; recruitment ; seasonality ; South Africa ; taxonomy
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    Notes: Abstract Although Porphyra is commercially farmed in many countries, in South Africa only small harvests of wild populations for sale as nori have been carried out. The discovery that Porphyra improves growth of South African abalone (Haliotis midae) farmed inland-based tanks has led to increased pressure to harvest wild populations. This paper reports on a survey of the distribution and seasonality of Porphyra in the southern Western Cape. Porphyrawas present at all sites surveyed, and showed considerable temporal variation. A significant amount of the Porphyra present is in reserves and therefore protected from harvesting. Close rexamination of one site revealed seasonal populations of Porphyra that occupied different niches dependent on season. Recruitment peaked in spring and autumn, leading to dense summer and winter populations. Summer populations generally grew lower in the eulittoral than winter populations. No pattern in the mortality of larger thalli wasde tected, though sporeling mortality was high following recruitment peaks. Although it seems that most sites in the southern Western Cape are suitable for harvesting, the taxonomy of the genus in the region urgently needs revision if populations are to be appropriately managed.
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  • 56
    ISSN: 1573-5176
    Keywords: Dunaliella ; ITS ; PCR ; RFLP ; strains ; taxonomy
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    Topics: Biology
    Notes: Abstract The genus Dunaliella comprises 28 species defined primarily by morphological and physiological criteria, which vary considerably depending on growth conditions. Concomitantly, the taxonomic status of various species is uncertain. To confirm the taxonomic identity and to better understand the relationship within Dunaliella, seven taxa ( D. salina, D. bardawil, D. tertiolecta, D. parva, D. viridis, D. lateralis, D. peircei) were compared using RFLP analysis of the nuclear rDNA repeats, specifically the internal transcribed spacer regions, including the 5.8S rRNA gene. Volvox aureus was used as an outgroup. A single ITS PCR amplification product was obtained for each taxon. An ITS fragment of ca. 640 bp was present in all the taxa within the subgenus Dunaliella, except for D. salina CCMP 1303 (ca. 540 bp) and D. lateralis (subgenus Pascheria) (ca. 600 bp). A cluster analysis based on the presence or absence of bands generated by digestion of the PCR product with 8 restriction endonucleases (DpnI, HhaI, EcoRI, PvuII, TaqI, HaeIII, MspI, StyI) revealed no correlation between the genetic relationship inferred from the ITS-RFLP data and the morpho-physiological attributes used for taxonomy. In addition, differences in morphology, physiology and in the length and restriction fragment patterns of the ITS region of D. salina CCMP 1303 suggest that this strain does not belong to Dunaliella.
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    Journal of bioeconomics 1 (1999), S. 13-18 
    ISSN: 1573-6989
    Keywords: Malthus ; Darwin ; evolution ; policy
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    Topics: Biology , Economics
    Notes: Abstract This is a rather impressionist report of my recollections of the history of the bioeconomics field.
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    Journal of bioeconomics 1 (1999), S. 35-45 
    ISSN: 1573-6989
    Keywords: bioeconomics ; competition ; Malthus ; Darwin ; division of labor ; specialization
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    Topics: Biology , Economics
    Notes: Abstract Progress is a difficult concept, but the phenomenon itself seems to be more than just an illusion. In this paper we consider how a bioeconomic perspective can help to clarify matters, especially when we compare aspects of organic evolution to technological progress. Beginning with the influence of Malthus upon Darwin, we see how the latter's ideas differ in important respects from those of other biologists and from those of social scientists and philosophers. Consideration of biologist's views about competition and the reasons for specialization suggests ways in which matters might be clarified by a more 'entrepreneurial' view of the relationships of organisms to the natural economy.
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    Biodiversity and conservation 4 (1995), S. 183-205 
    ISSN: 1572-9710
    Keywords: biological collections ; conservation ; biodiversity information ; phylogenetic systematics ; taxonomy
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    Topics: Biology
    Notes: Abstract Systematics and taxonomy are essential: they respectively elucidate life's history, and organize and verify biological knowledge. This knowledge is built of interrelated concepts which are ultimately accounted for by biological specimens. Such knowledge is essential to decide how much and what biodiversity survives human onslaughts. The preservation of specimens in natural history collections is the essential part of the process which builds and maintains biological knowledge. These collections and the human expertise essential to interpret specimens are the taxonomic resources which maintain accurate and verifiable concepts of biological entities. Present and future knowledge of the complexities and diversity of the biosphere depends on the integrity of taxonomic resources, vet widespread ignorance and disregard for their fundamental value has created a global crisis. Preservation of specimens in natural history collections is chronically neglected and support to study and manage collections is very insufficient. The knowledge held by experienced taxonomists is not being passed on to younger recruits. Neglect of collections has destroyed countless specimens and threatens millions more. These threats to taxonomic resources not only impinge on systematics but all biology: this tragedy jeopardizes the integrity of biological knowledge. The consequences for environmental conservation and therefore humanity are also of dire severity and the biodiversity crisis adds unprecedented weight to the barely recognized crisis in taxonomy and systematics.
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    Mycoscience 37 (1996), S. 367-369 
    ISSN: 1618-2545
    Keywords: Dematiaceae ; Deuteromycotina ; taxonomy
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    Topics: Biology
    Notes: Abstract Sporidesmium filiferum isolated from a leaflet ofPhellodendron amurense lying on the soil surface at Tsukuba, Japan is described together with photomicrographs.
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    Mycoscience 39 (1998), S. 333-335 
    ISSN: 1618-2545
    Keywords: Cortinarius prunicola ; Cortinarius Sect.Sericeocybe ; new species ; Rosaceae ; taxonomy
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    Notes: Abstract Cortinarius prunicola sp. nov., found in orchards and plantations ofPrunus mume, is described and illustrated. It is characterized by its dry and violet-white carpophores, unpleasant odor, and its close association withP. mume in spring and early summer. The differences betweenC. prunicola and similar species are briefly discussed.
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    Mycoscience 40 (1999), S. 165-183 
    ISSN: 1618-2545
    Keywords: freshwater fungi ; Halosphaeriaceae ; taxonomy ; tropics
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    Notes: Abstract The generic concepts inAniptodera, Halosarpheia, Nais andPhaeonectriella are discussed and those species occurring in freshwater are described, some with illustrations. Five new species:Aniptodera lignicola, A. mauritaniensis, A. megalospora, A. palmicola, Phaeonectriella appendiculata are also described. A key to the freshwater species in the above genera and a synoptic diagram of their ascospores are provided.
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  • 63
    ISSN: 1618-2545
    Keywords: Ascomycota ; marine fungi ; new species ; taxonomy
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    Notes: Abstract A new speciesDactylospora mangrovei is described and illustrated and compared withD. haliotrepha andD. canariensis, all marine inhabiting species.Dactylospora haliotrepha andD. mangrovei are tropical/sub-tropical mangrove species collected in Hong Kong, Malaysia, Taiwan and Thailand, whileD. canariensis was described from temperate waters. A map of the geographical distribution of the three marineDactylospora species is presented.
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    Mycoscience 40 (1999), S. 185-188 
    ISSN: 1618-2545
    Keywords: Amphisphaeria ; ascomycetes ; bamboo fungi ; taxonomy
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    Notes: Abstract A new species ofArecophila and a species previously known asAmphisphaeria coronata are described and illustrated from dead culms of bamboo.Arecophila bambusae sp. nov. is distinct in the genus in having ellipsoidal ascospores with slightly round ends, and asci with a narrow subapical ring.Arecophila coronata comb. nov. has asci with a wedgeshaped apical ring and weakly striated ascospores enclosed in wide mucilaginous sheath.
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    Biology and philosophy 10 (1995), S. 223-228 
    ISSN: 1572-8404
    Keywords: Clade ; class ; definition ; defining property ; individual ; intension ; name ; organism ; ostensive definition ; species ; taxon ; taxonomy
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    Topics: Biology , Philosophy
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    Biology and philosophy 11 (1996), S. 1-20 
    ISSN: 1572-8404
    Keywords: Darwin ; functionalism ; structuralism ; causal pluralism
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    Topics: Biology , Philosophy
    Notes: Abstract Historians of Biology have divided nineteenth century naturalists into two basic camps, Functionalists and Structuralists. This division is supposed to demarcate the alternative causal presuppositions working beneath research programs. If one is functionally oriented, then organic form will be contingent upon the causal powers of the environment. If structurally oriented, one argues for nonfunctional mechanisms (e.g., internal laws of growth) to account for organic form. Traditionally, Darwin has been grouped with the functionalists because natural selection (an adaptational mechanism) plays the prominent role in shaping organic form. In this paper, I sketch the dichotomy of functionalism versus structuralism and then argue that Darwin cannot be characterized adequately with this dichotomy. I argue that Darwin can incorporate both causal stories because he makes two important modifications to the traditional metaphysical presuppositions. I then offer some brief reflections on the import of Darwin's causal pluralism for the Philosophy of Science.
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    Biology and philosophy 11 (1996), S. 215-244 
    ISSN: 1572-8404
    Keywords: Classes ; classification ; evolution ; Buffon ; Darwin ; Ghiselin ; individuality ; ordering ; concept of species
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    Topics: Biology , Philosophy
    Notes: Abstract Since the 1970s, there has been a tremendous amount of literature on Ghiselin's proposal that “species are individuals”. After recalling the origins and stakes of this thesis in contemporary evolutionary theory, I show that it can also be found in the writings of the French naturalist Buffon in the 18th Century. Although Buffon did not have the conception that one species could be derived from another, there is an interesting similarity between the modern argument and that of Buffon regarding the “individuality of species’. The analogy is strong enough to force us to recognize that genuine evolutionary (or Darwinian) questions might be of secondary importance in the discussion. In consequence, the third section of the paper proposes an alternative schema for the “logical structure” of the Darwinian concept of species. Darwin distinguished the problem of the designation of a concrete species, and the problem of its signification of species within his theory of descent? The resulting notion of species involves a logical structure based on the fusion of the logical operations of classification and ordering. The difficulty — and interest — is that this interpretation of species does not entail any precise operational definition of species; it can only tell us what the ultimate signification of classification is within the theory of descent with modification through natural selection.
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    Biology and philosophy 11 (1996), S. 405-420 
    ISSN: 1572-8404
    Keywords: species ; evolution ; natural selection ; gradualism ; punctuated equilibria ; variation ; Lamarck ; Darwin
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    Topics: Biology , Philosophy
    Notes: Abstract Species are thought by many to be important units of evolution. In this paper, I argue against that view. My argument is based on an examination of the role of species in the synthetic theory of evolution. I argue that if one adopts a gradualist view of evolution, one cannot make sense of the claim that species are “units” in the minimal sense needed to claim that they are units of evolution, namely, that they exist as discrete entities over time. My second argument is directed against an appeal to Eldredge and Gould's theory of punctuated equilibria to support the claim that species are units of evolution. If one adopts their view, it may be possible to identify discrete temporal entities that can plausibly be termed ‘species’, but there is no reason to claim that those entities are “units of evolution”. Thus, on two plausible interpretations of the role of natural selection in the process of evolution, species are of no special importance. I then consider some of the reasons why species have been thought to be important evolutionary units by many contemporary evolutionary biologists. Finally, I discuss briefly the implications of this conclusion for evolutionary biology.
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    Biology and philosophy 11 (1996), S. 519-534 
    ISSN: 1572-8404
    Keywords: Hume ; Darwin ; Dawkins ; Sober ; Mackie ; Penrose ; argument for design ; biological design ; cosmological fine-tuning ; world ensemble ; chance ; theism ; God
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    Topics: Biology , Philosophy
    Notes: Abstract There seems to be a widespread conviction — evidenced, for example, in the work of Mackie, Dawkins and Sober — that it is Darwinian rather than Humean considerations which deal the fatal logical blow to arguments for intelligent design. I argue that this conviction cannot be well-founded. If there are current logically decisive objections to design arguments, they must be Humean — for Darwinian considerations count not at all against design arguments based upon apparent cosmological fine-tuning. I argue, further, that there are good Humean reasons for atheists and agnostics to resist the suggestion that apparent design — apparent biological design and/or apparent cosmological fine-tuning — establishes (or even strongly supports) the hypothesis of intelligent design.
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    Biology and philosophy 13 (1998), S. 443-470 
    ISSN: 1572-8404
    Keywords: Buffon ; Darwin ; Gayon ; species ; individuality ; evolution
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    Topics: Biology , Philosophy
    Notes: Abstract Gayon's recent claim that Buffon developed a concept of species as physical individuals is critically examined and rejected. Also critically examined and rejected is Gayon's more central thesis that as a consequence of his analysis of Buffon's species concept, and also of Darwin's species concept, it is clear that modern evolutionary theory does not require species to be physical individuals. While I agree with Gayon's conclusion that modern evolutionary theory does not require species to be physical individuals, I disagree with his reasons and instead provide logical rather than historical reasons for the same conclusion.
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    Biology and philosophy 14 (1999), S. 253-278 
    ISSN: 1572-8404
    Keywords: ancestry ; Bayesianism ; creationism ; Darwin ; evolution ; likelihood ; natural selection ; phylogeny ; probability ; Reichenbach
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    Topics: Biology , Philosophy
    Notes: Abstract Modus Darwin is a principle of inference that licenses the conclusion that two species have a common ancestor, based on the observation that they are similar. The present paper investigates the principle's probabilistic foundations.
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    Biodiversity and conservation 5 (1996), S. 1295-1305 
    ISSN: 1572-9710
    Keywords: Archaea ; Bacteria ; Antarctica ; biodiversity ; 16S rRNA ; taxonomy
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    Topics: Biology
    Notes: Prokaryotes perform key functions in Antarctic ecosystems, and knowledge of the taxonomy of Antarctic prokaryotes is a prerequisite for the transfer of information between fields of scientific inquiry. The taxonomy of prokaryotes has been greatly revised and improved due to the refinements afforded by molecular techniques such as 16S rRNA sequencing. Past inventories of Antarctic microbial diversity are difficult to reconcile with the developing, phylogenetically-based taxonomy. Antarctic prokaryotes are considerably diverse and most evolutionary groups are represented, including representatives of both Archaea and Bacteria. The diversity appears unique due to the ease with which new species can be isolated; however, that may be a result of our vastly incomplete knowledge of both Antarctic and non-Antarctic prokaryotic diversity. Use of the 16S rRNA gene as a molecular clock would suggest that the majority of Antarctic prokaryotes diverged from their nearest known non-Antarctic relatives long before a stable ice-sheet developed in Antarctica. The time of colonization (or recolonization) of Antarctic environments by individual species may have been very recent in evolutionary time scales.
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    Biodiversity and conservation 5 (1996), S. 1307-1335 
    ISSN: 1572-9710
    Keywords: algae ; cyanobacteria ; terrestrial ; Antarctica ; taxonomy ; endemism ; distribution ; dispersal
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    Topics: Biology
    Notes: Terrestrial algae have been studied at widespread Antarctic localities. However, their diversity is not fully known as often collections have not been made from all habitats and techniques have been inadequate for recognition of the total flora. Identifications can be unreliable and are often left at generic level. Despite this it seems that they largely comprise cosmopolitan species but at a reduced diversity relative to other regions. There is a small element of endemic species which, in general, differ only slightly from related species elsewhere. Lack of base-line taxonomic knowledge, detailed characterization of environmental factors, and application of multivariate analysis restricts our ability to define communities and interpret their distribution patterns. Examples are provided where understanding would be greatly improved by more detailed analyses. Dispersal barriers could be operating both to and within Antarctica. However, local dispersal by wind seems readily accomplished. Overcoming dispersal barriers to Antarctica, and between ice-free localities within Antarctica, could present a greater problem. Investigation of long-distance transport of propagules by wind, birds and humans is needed.
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    Journal of applied phycology 10 (1998), S. 237-251 
    ISSN: 1573-5176
    Keywords: Gelidiales ; Gelidiella ; Gelidium ; Pterocladia ; Pterocladiella ; taxonomy
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    Topics: Biology
    Notes: Abstract Segregating Pterocladiella from Pterocladia stimulated new taxonomic studies of the species originally assigned to Pterocladia. A total of 28 species are ascribed to the genus, one of them with doubts. Thirteen of the 27 names are synonyms. Three of the remaining 14 species belong with Gelidium, including G. americanum, G. mcnabbianum (Dawson) comb. nov. and G. musciformis. Seven other species belong with Pterocladiella, including P. bartlettii (Taylor) comb. nov., P. bulbosa, P. caerulescens, P. caespitosa (Kylin) comb. nov., P. caloglossoides (Howe) comb. nov., P. capillacea and P. melanoidea. Two species are retained in Pterocladia, the type P. lucida and P. rectangularis. Two others, P. heteroplatos and P. media are placed in incertae sedis as additional studies of fertile materials are needed to determine their generic status. The genus Pterocladia now appears to include two large-sized species restricted to Australia-New Zealand. Pterocladiella has 8 small-sized species (including P. minima), mainly inhabiting tropical and subtropical waters. Future research documenting sexual reproduction in Gelidiella and solving the presently recognized heterogeneity in Gelidium will help to trace the relationships between Pterocladiella and these two genera.
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    Hydrobiologia 310 (1995), S. 79-86 
    ISSN: 1573-5117
    Keywords: marine nematodes ; Epsilonematidae ; Leptepsilonema ; taxonomy ; new species
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    Topics: Biology
    Notes: Abstract The genusLeptepsilonema is recorded for the first time from the Mediterranean:L. santii sp.n. is characterised by a slender body with a large number of annules (122–128). Cuticular ornamentation with clear ridges and a lateral field of small thorns on both sides of the anteriormost annules are also typical as well as the number and arrangement of copulatory thorns (2–3 pairs, 2 fields), the shape and length (49–58 µm) of spicules in males.L. filiforme is recorded from New Caledonia; specimens largely resemble the original types but are larger. The variability of some morphological structures is discussed.
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  • 76
    ISSN: 1573-5117
    Keywords: Mollusca ; Bulinus ; freshwater snails ; taxonomy ; distribution ; Africa ; Namibia ; Schistosoma haematobium ; schistosomiasis
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    Topics: Biology
    Notes: Abstract Freshwater snails collected in central Namibia, south-western Africa, from 15 populations belonging to the Bulinus truncatus/tropicus complex (Planorbidae) are characterised in respect of their chromosome number, morphology, egg proteins and enzymes. The population samples were all consistently diploid and euphallic. The findings are compared with observations on this group of snails in other areas of Africa. It is concluded that the Namibian populations belong to a single species, B. tropicus (Krauss, 1848), of which B. parietalis (Mousson, 1887) is probably a synonym. No evidence was found of any occurrence of the tetraploid species B. truncatus or of snails belonging to the B. africanus group; lack of a potential intermediate host therefore precludes transmission of Schistosoma haematobium in this area.
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    ISSN: 1573-5117
    Keywords: Anostraca ; taxonomy ; limb structure ; Streptocephalus
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    Topics: Biology
    Notes: Abstract Streptocephalus caljoni n. sp. from Burundi is described. It is related to Streptocephalus trifidus, but differs from it and other Streptocephalus in the cheliform hand of the male antenna II. We also analyse the morphology of the setae on the endo- and exopodite of the fifth trunk limb, using light- and scanning electron microscopy. This analysis reveals additional differences between the two related species, and is a useful tool in the study of the taxonomy of the Anostraca.
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    Hydrobiologia 298 (1995), S. 287-293 
    ISSN: 1573-5117
    Keywords: India ; Pakistan ; Sri Lanka ; species richness ; taxonomy ; zoogeography
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    Topics: Biology
    Notes: Abstract There are 15 species of Anostraca belonging to 6 genera on the Indian Subcontinent. These are:Artemia sp. (reportedly a bisexual form of undetermined species);Artemia parthenogenetica Bowen & Sterling, 1978;Branchinecta orientalis Sars, 1901;Branchinella hardingi (Qadri & Baqai, 1956);Branchinella kugenumaensis (Ishikawa, 1895);Branchinella ornata Daday, 1910;Branchipodopsis acanthopenes (Malhotra & Duda, 1970);Branchipodopsis affinis Sars, 1901;Branchipus schaefferi Fischer, 1834;Chirocephalus priscus (Daday, 1910);Streptocephalus dichotomus Baird, 1860;Streptocephalus echinus Bond, 1934;Streptocephalus longimanus Bond, 1934;Streptocephalus simplex Gurney, 1906;Streptocephalus spinifer Gurney, 1906. Comparing numbers of species for southern India with other reasonably well studied areas, demonstrated that anostracan species richness is higher in the climatically more varied temperate regions than it is in the more uniform tropics. Tropical South India has six species compared to 13 in Arizona (USA), 19 in California (USA), 10 in Morocco, and 14 in Italy.
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    Hydrobiologia 298 (1995), S. 307-313 
    ISSN: 1573-5117
    Keywords: Tanymastix ; Anostraca ; taxonomy ; zoogeography ; Macedonia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The genusTanymastix Simon, 1886 is represented in Macedonia by two species:Tanymastix stagnalis (Linnaeus, 1758) andTanymastix motasi Orghidan, 1945. The fairy shrimpT. stagnalis has been found exclusively in the rock pools containing only several litres of water, above the village of Stracin, N. E. Macedonia.T. motasi is present only in the shallow rainpools, less than 15 cm in depth, scattered over an area of untilled, highly-mineralized pasture land in the Pelagonia Plain, S. W. Macedonia. BothTanymastix species are the only anostracans in their biotopes. In Stracin, all the neighbouring rain pools in soil substrat are occupied byChirocephalus diaphanus carinatus (Daday, 1910). In Pelagonia, the deeper water bodies are generally inhabited byChirocephalus pelagonicus Petkovski, 1986 andChirocephalus diaphanus carinatus (Daday, 1910). On the basis of abundant material of both species, a detailed study of essential morphological characters has been carried out and comparisions with data given in the literature have been made. InT. stagnalis, aberrant morphological features were not ascertained. InT. motasi, the originaldescription of the species, hitherto known only for the Giurgiu Region in Rumania, is supplemented by additional diagnostic characteristics.
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  • 80
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    Hydrobiologia 299 (1995), S. 249-257 
    ISSN: 1573-5117
    Keywords: Keratella ; Rotifera ; taxonomy ; polymorphism ; lateral antennae ; South America
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The morphological characteristics ofKeratella lenzi (f.ayui) f. nov. and the phylogenetic and ecological implications of the appearance of posterolateral spines inK. lenzi Hauer, 1953 are discussed. The morphotype is described after detailed observations using light and scanning electron microscopy, and compared with otherKeratella species of the superspecies ‘valga’. The pores of the lateral antennae are described, and proposed as a new character for future comparative research. Some ecological information is also given.
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  • 81
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    Hydrobiologia 339 (1996), S. 23-25 
    ISSN: 1573-5117
    Keywords: Rotifera ; Thailand ; taxonomy ; Lecane segersi n.sp.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Lecane segersi n.sp. collected from a swamp in Udornthani province, northeastern part of Thailand, is described and figured. It is closely related to the common, warm-stenotherm Lecane papuana (Murray), but distinguished by the presence of inwardly directed antero-lateral spines.
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  • 82
    ISSN: 1573-5117
    Keywords: Attheyella (Canthosella) mervini ; taxonomy ; new species ; Jamaica ; phytotelmata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In phytotelmata of Jamaican bromeliads the harpacticoid copepods Epactophanes richardi Mrázek, 1893, Phyllognathopus viguieri (Maupas, 1892) and Attheyella (Canthosella) mervini sp. n. occurred. The new species conforms to the diagnosis of the subgenus, despite the fact that the endopods of legs 2–4 have retained more setae than in the species known for the Asian region. Attheyella (Canthosella) mervini lacks setae on the baseoendopod of leg 5, which is characteristic for neotropical Canthosella-species. We propose that Attheyella (Chappuisiella) kalima (Delachaux, 1924), Attheyella (Ch.) aliena Noodt, 1956, Elaphoidella siolii Kiefer, 1967, and Canthocamptus (Elaphoidella) striblingi Reid, 1990 be included in the subgenus Attheyella (Canthosella). Additionally, Attheyella (Chappuisiella) kalima of Dussart & Frutos, 1986 is included in this subgenus, but we propose the name Attheyella (Canthosella) pilagaensis sp.n., because the species as described differs from the original description of A. (C.) kalima (Delachaux, 1924).
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  • 83
    ISSN: 1573-5117
    Keywords: Antartica ; Weddell Sea ; new genus ; Archilaophonte maxima ; taxonomy
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    Notes: Abstract Male and female of a new genus and species of the family Laophontidae, Archilaophonte maxima, are described. The specimen was found in the high Antartic (Weddell Sea) and apprears to be the most primitive genus up to now within the superfamily Laophontoidea as defined by Huys (1990). Based on its setation of legs and mouth parts, however, it can be placed unequivocally into the family Laophontidae. Archilaophonte maxima gen. n. shows close affinities to the laophontid genus Esola Edwards 1891. Both genera form a monophyletic group which is interpreted here as the first and most primitive offshot in the evolution of the Laophontidae. The synapomorphies of the former lineage are the shape of the protopodite of the P1 and shape and setation of the female P5.
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  • 84
    ISSN: 1573-5117
    Keywords: Turbellaria ; Retronectidae ; Myoretronectes ; taxonomy ; morphology ; ecology ; Paraná river ; Argentina
    Source: Springer Online Journal Archives 1860-2000
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    Notes: Abstract Myoretronectes paranaensis, gen. et sp. n., from lotic sandy bottoms of the Paraná river, Argentina, is described. The establishment of the new genus is based on the presence of a non-ciliated pharynx, a discrete oesophagus, and a strong muscle system surrounding the distal pharynx. A new emended diagnosis of the family Retronectidae is presented. Myoretronectes paranaensis apparently cohabits with the oligochaete Narapa bonettoi Righi & Varela, 1983 and the copepod Parastenocaris sp.
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  • 85
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    Keywords: Phyllodiaptomus ; Copepoda ; Calanoida ; taxonomy ; biogeography ; Thailand
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Phyllodiaptomus christineae n.sp. is described from Thailand. It stands out, in the male, by the shape and the armature of the second exopodite-segment of the right P5 and by the elongate apical process and ornamentation of the second exopodite-segment of the left P5; in the female, by the reduced lateral wings of the fifth pediger, and by the form of the genital somite. Together withP. blanci, P. tunguidus andP. longipes, the new species constitutes the blanci-group, here raised to the level of a subgenus (Phyllodiaptomus s.s.) with representatives in Central Asia, China, Borneo and Thailand. A second subgenus (Ctenodiaptomus subgen. nov.) is created to accommodate the four Asian species of the annae-group.
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  • 86
    ISSN: 1573-5117
    Keywords: taxonomy ; fish parasites ; Copepoda ; Ergasilidae ; Acusicola ; Brazil
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    Notes: Abstract Four new species of Acusicola are described based on adult females found on gill filaments of several species of coastal and freshwater fishes caught in Brazilian basins. The distribution area of the genus in Brazil is significantly enlarged, since until now the previous Brazilian species had been known only from Amazonian fishes. The specimens identified as Acusicula tenax by Cressey and Collette (1970) are considered representatives of a new species, A. rogeri. A key for identification of the species of Acusicola is provided.
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  • 87
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    Hydrobiologia 324 (1996), S. 163-177 
    ISSN: 1573-5117
    Keywords: Mollusca ; Bulinus ; freshwater snails ; taxonomy ; distribution ; Africa ; Zambia ; Schistosoma haematobium ; schistosomiasis
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    Topics: Biology
    Notes: Abstract The Bulinus africanus species group (Planorbidae) of freshwater snails has been reported to be represented in Zambia by two species, B. africanus (Krauss) and B. globosus (Morelet), both named as intermediate hosts for Schistosoma haematobium. Uncertainty in identification of these snails from morphology led to the present investigation, combining morphometry (shell and copulatory organ) with enzyme analysis. Observations of both kinds were made usually on the same individual snails, from collecting sites mostly in the Lusaka area or at Lake Kariba. Particular attention was given to the proportional relationship between the penis sheath and the preputium of the copulatory organ, a character used previously to distinguish B. africanus from B. globosus in south-eastern Africa. The enzyme profile MDH-1, AcP-2, PGD-1 and PGM-2 was common to all snails examined from 25 populations; GPI and HBDH were polymorphic. The enzyme data indicate that the samples represent a single species. Shell characters varied continuously. The copulatory organ was generally of the form known for B. globosus. Although the copulatory organ of a few individuals had proportions overlapping the range reported for B. africanus, the present variation was continuous and was not bimodal. It is concluded that all these specimens are conspecific and may be identified as B. globosus. Previous identifications of B. africanus from Zambia appear to need substantiation and it seems that if this species is present at all in the sampled areas, it must be uncommon. It is relevant in regard to possible strain differences within S. haematobium in Zambia, that our observations indicate that only a single species of intermediate host is involved in transmission.
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  • 88
    ISSN: 1573-5117
    Keywords: Ectoprocta ; bryozoa ; Phylactolaemata ; Plumatella ; taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Plumatella nitens is a newly recognized species of phylactolaemate bryozoan in North America. It has previously been combined with either P. repens or P. fungosa, from which it differs primarily by the floatoblast. In P. nitens the ventral floatoblast annulus is uniformly narrow with no significant widening at the poles. The dorsal floatoblast fenestra is conspicuously larger than in either P. repens or P. fungosa. Reticulated ridges on the dorsal fenestra are weak along the margins, becoming unusually prominent in the center. The sessoblast is densely covered with uneven papillae. Spotty sampling so far shows a distribution only in the northern half of North America, including Massachusetts, Michigan, Minnesota, Wisconsin, Ontario, and the northern regions of Illinois, Indiana, and Ohio.
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  • 89
    ISSN: 1573-5117
    Keywords: taxonomy ; Ostracoda ; China ; ancient lakes ; saline lakes ; biogeography ; checklist ; Fabaeformiscandona danielopoli n.sp.
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    Topics: Biology
    Notes: Abstract Fabaeformiscandona danielopoli n.sp. isdescribed from the Chinese Lake Erhai, a freshwaterlagoon of the ancient saline lake Qinghai. The speciesbelongs to the acuminata-group of the genus andis characterized by the shape of both male and femalevalves and by the morphology of the female genitallobe and of lobe ‘a’ in the hemipenis. The new speciesis quite rare in its type locality and might beendemic to the ancient Qinghai basin. A checklist ofRecent non-marine Chinese ostracods is offered inappendix.
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  • 90
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    Hydrobiologia 365 (1997), S. 33-46 
    ISSN: 1573-5117
    Keywords: Phylogeny ; cladistics ; taxonomy ; systematics ; classification ; evolution ; history ; chronicle ; Nemertea ; Hoplonemertea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract I review how some influential nemertean systematistshave perceived and illustrated phylogenetic trees andargue that the nineteenth century nemerteantaxonomists still influence many contemporarynemertean taxonomists to a high degree. By showing hownineteenth century systematics differs from moremodern views on trees, I hope to convey the advantagesof a cladistic approach to tree-thinking and nemerteansystematics. Furthermore I propose a systematizationof the Eureptantia that illustrates the cladisticapproach to tree-thinking but, more importantly, isalso a better representation of eureptantic phylogenythan previous classifications.
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  • 91
    ISSN: 1573-5117
    Keywords: Rotifera ; zoogeography ; Thailand ; taxonomy ; B. niwati n.sp.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Ninety-three freshwater habitats in the north-eastern part of Thailand were surveyed for rotifers during March–October 1993. Two hundred species were identified, 120 of which are new to Thailand. Brachionus africanuss Segers, B. lyratus Shephard and Trichocerca hollaerti De Smet are new to Asia. Brachionus niwati n.sp. is described and figured. Brachionus donneri Brehm, Keratella edmondsoni (Ahlstrom) and Lecane blachei Berziņš, endemic to south and southeast Asia, were found also. Comments are presented on some insufficiently known taxa. Of special zoogeographic interest is the record of several species previously considered endemic to Australia. An attempt is made to characterise the Thai rotifer fauna in the light of recent developments in rotifer zoogeography.
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  • 92
    ISSN: 1573-5117
    Keywords: Chironomidae ; systematics ; taxonomy ; morphology
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    Topics: Biology
    Notes: Abstract The characters of the genitalia of the females of Glyptotendipes glaucus (Meigen, 1818), Glyptotendipes pallens (Meigen, 1804), Glyptotendipes paripes (Edwards, 1929), Glyptotendipes gripekoveni (Kieffer, 1913), Glyptotendipes aequalis (Kieffer, 1922), Glyptotendipes barbipes (Staeger, 1839) and Glyptotendipes salinus Michailova, 1987 are described. A key for the identification of these species is given. The taxonomic status of Glyptotendipes aequalis is discussed.
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  • 93
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    Hydrobiologia 321 (1996), S. 191-204 
    ISSN: 1573-5117
    Keywords: Cladocera ; taxonomy ; species estimation ; world fauna
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An estimation of the number of taxa within families, genera and local faunas of Cladocera reveals that only c. 129 species (17% of all known species) may be considered as sufficiently well described (valid species), and c. 146 as rather well described (fair species) but needing further study using modern methods of investigation. The status of all other species is vague. The families Chydoridae, Daphniidae and Sididae and genera Diaphanosoma, Daphnia, (including Daphniopsis), Megafenestra, Scapholeberis, Eurycercus, Chydorus, Ephemeroporus and Pleuroxus have been comparatively studied best. The largest number of valid species is known from Europe, North America, Australia and South America, and the smallest number from Africa. Presence of large number of vague species of Cladocera negatively affects faunistic, zoogeographic, and ecological studies of continental waters.
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    Hydrobiologia 323 (1996), S. 45-59 
    ISSN: 1573-5117
    Keywords: Chydorus ‘mutilus’ ; Chydorus sphaericus ; high altitude lakes ; palaeolimnology ; taxonomy ; ecology ; sediments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Since 1991 faunal collections have been made from the mountain lakes of NW Slovenia. These lakes are at altitudes of between 1250 and 2150 m a. s.l., and have rich biotas, both in terms of species-richness, and faunal abundance. Amongst the animals collected were ‘hump-backed’ specimens of genus Chydorus. These are identical with Chydorus ‘mutilus’, a species described from Swiss mountain lakes by Kreis (1921). The abundance of specimen in the collections, coupled with the availability of data from four successive years of sampling, allowed the detailed analysis of these populations. This also includes an examination of chitinous remains preserved in subrecent sediments. The results show that C. ‘mutilus’ Kreis, 1921 actually represents a postephippial form of C. sphaericus (O. F. Müller, 1785). From the data available, it appears that the ‘hump-backed’ form only occurs under certain environmental conditions. Here I discuss environmental factors having the potential to trigger the formation of hump-backed Chydorus. These findings may prove significant in palaelimnological studies, and in the reconstruction of paleotemperatures. In addition, hump-backed animals, apparently identical to European C. ‘mutilus’, have also been found in a sample taken from Lake Titicaca (Peru) in 1954. This supports the hypothesis that the hump-backed morph is an environmentally-cued ecophenotype, and not an independent taxon.
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    Hydrobiologia 334 (1996), S. 37-49 
    ISSN: 1573-5117
    Keywords: Oligochaeta ; Naididae ; taxonomy ; distribution ; Italy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We present a list of Italian freshwater and marine Oligochaeta in the families Lumbriculidae, Haplotaxidae, Tubificidae, Naididae, Propappidae, Criodrilidae, and Lumbricidae, representing 57 genera and 130 species. Published data reflect the incomplete knowledge of the Italian oligochaete fauna, restricted to certain geographical areas. Subterranean aquatic and marine fauna are of particular interest as these have been studied the least. We provide a comprehensive review of the Naididae including, for the first time, southern Italy and the islands of Sicily and Sardinia. The distribution of species is discussed and taxonomic problems arising from the morphological variability of Italian material are examined.
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  • 96
    ISSN: 1573-5117
    Keywords: Aquatic oligochaetes ; Enchytraeidae ; Guyana ; distribution ; taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract About 50 species in more than 20 genera of the microdrile oligochaete families Tubificidae, Naididae, Opistocystidae, and Enchytraeidae and the freshwater megadrile families Sparganophilidae and Alluroididae were identified in recent collections made in Guyana. Only seven species in these families were previously recorded from Guyana. The aquatic oligochaete fauna has similar components to those of the southeastern United States, other locations in South America, and across lower latitudes in the northern hemisphere. A high diversity of species is found in the naidids especially in the genera Pristina and Pristinella, especially considering the small number of locations that have been sampled. The collections include approximately 12 new species of rhyacodrilines (Tubificidae), Dero, Pristina, Pristinella (Naididae), Brinkhurstia (Alluroididae), Hemienchytraeus and Aspidodrilus (Enchytraeidae). This is the first record of Aspidodrilus from outside of Africa and the first new record since 1952.
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  • 97
    ISSN: 1573-5117
    Keywords: Enchytraeidae ; Oligochaeta ; taxonomy ; general protein ; morphology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In the Enchytraeidae, species separation and identification is often problematic due to high morphological similarity of closely related species and considerable intraspecific variability of crucial characteristics. Immature specimens are almost undeterminable. To meet these difficulties, this paper recommends the consulting of general protein patterns as exhibited by non-specific silver-staining after isoelectric focusing. A method is presented which allows the successful inclusion of protein data in taxonomic studies and field surveys. Two examples from an investigation on Fridericia field populations show that, with the help of general protein pattern analysis, a clear taxonomic decision on the identity of morphologically aberrant forms and of juvenile specimens as well can be achieved with comparatively little expenditure of time. A combined use of morphological and protein data for taxonomic purposes is suggested.
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  • 98
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    Hydrobiologia 336 (1996), S. 19-32 
    ISSN: 1573-5117
    Keywords: diatoms ; biogeography ; species concept ; taxonomy ; conservation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Recent morphometric and breeding studies of diatoms show that the present species classification is too coarse and hides significant diversity. Many species are subdivided into phenodemes, which often differ in cell size, shape, stria density and pattern, but may also have different ultrastructural features. In raphid diatoms these can include the form of the raphe endings, details of the pore occlusions, and the structure of the girdle, while chloroplast structure can also vary. The phenodemes can be sympatric or allopatric. In Sellaphora pupula and other species, sympatric phenodemes are reproductively isolated. It is recommended that such demes are recognized as separate species; the total number of diatom species worldwide may thus be at least 2 × 105. Use of a fine-grained classification reveals that many diatom species may be endemics, some restricted to a single lake or catchment, others to wider areas. Environmental impact assessments and conservation strategies must begin to take account of endemism and rarity among microscopic algae and protists.
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    Hydrobiologia 336 (1996), S. 99-106 
    ISSN: 1573-5117
    Keywords: snow algae ; taxonomy ; ultrastructure ; new species
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A list of the 24 species of snow algae identified from the region, a resume of what is currently known about the major species, and avenues for further research are provided. New species discovered include 2 Desmotetra spp., one Chlorosarcina sp., 2 Chloromonas spp. and a Palmellopsis sp. Several of these are from genera whose members have previously been found only in the soil flora. Not only was it necessary to elucidate the life cycle of these species, but it was also essential to examine them ultrastructurally to determine their taxonomic positions.
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    Hydrobiologia 356 (1997), S. 157-163 
    ISSN: 1573-5117
    Keywords: Lecanidae ; N.E. India ; Tripura ; taxonomy ; distribution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Thirty-five species of the family Lecanidae are examined from Tripura state in North-Eastern India. Of these, Lecane levistyla and L. scutata are interesting cold-water forms; L. batillifer is an Australasian element; L. acanthinula and L. sinuata are Oriental endemics and L. braumi, L. lateralis and L. simonneae are palaeotropical species. The lecanid fauna also includes the pantropical L. thienemanni and L. sola while the remainder are cosmopolitan and tropicopolitan elements.
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