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  • 1
    Electronic Resource
    Electronic Resource
    Distribution of species of Anostraca, Notostraca, Spinicaudata, and Laevicaudata in Mexico (1991)
    Springer
    Hydrobiologia 212 (1991), S. 209-219 
    Details
    ISSN: 1573-5117
    Keywords: Anostraca ; Notostraca ; Spinicaudata ; Laevicaudata ; Branchiopoda ; Mexico ; distribution ; conchostracan
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We inventorize the known distribution of the species of Anostraca, Notostraca, Spinicaudata, and Laevicaudata present in Mexico. Determinations of the species and their distribution involved: 1) Examination of Mexican collections of phyllopods, 2) Extensive sampling in 17 states, and 3) Study of laboratory cultures. The number of phyllopod species known to occur in Mexico is 27: 14 of Anostraca, including three undescribed species, 1 of Notostraca, 10 of Spinicaudata, and 2 of Laevicaudata. These results also include 44 new state records. The records of Branchinecta packardi are the first for Mexico. Some species have extensive distributions, not limited to Mexico: Streptocephalus mackini, S. texanus, Thamnocephalus platyurus, Triops longicaudatus and Leptestheria compleximanus. The species known only from Mexico are Streptocephalus kargesi, S. moorei, Paralimnetis mapimi, two undescribed species of Branchinecta, and an undescribed species of Streptocephalus. The largest number of species found to occur in the same pond at one time was eight.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00026003
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  • 2
    Electronic Resource
    Electronic Resource
    Branchinecta belki n. sp. (Branchiopoda: Anostraca), a new fairy shrimp from Mexico, hybridizing withB. packardi Pearse under laboratory conditions (1992)
    Springer
    Hydrobiologia 239 (1992), S. 151-162 
    Details
    ISSN: 1573-5117
    Keywords: Branchinecta ; Branchiopoda ; Anostraca ; Mexico ; hybridization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A new fairy shrimp,Branchinecta belki n.sp., endemic to the south of Coahuila state is described and figured. A total of nine species of phyllopods, including the new species, occur in ponds in the type area. The laboratory hybridization ofB. belki andB. packardi through ‘no-choice’ mating tests in reciprocal crosses is discussed. A mixture of characteristics of parental species is present in male F1 and F2 hybrids. This may provide a biological tool, or ‘search image’ (sensu Wiman, 1979a), for detecting male hybrids, should such exist, between theBranchinecta species of this study in nature. In addition to the reported interspecific hybridizations inStreptocephalus (Wiman, 1979a & 1979b) and inArtemia (Bowenet al., 1985) under laboratory conditions, the new evidence inBranchinecta suggests that absence of efficient premating mechanisms may be common in Anostraca.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00007672
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  • 3
    Electronic Resource
    Electronic Resource
    Diagnosis and phylogeny of the new world streptocephalidae (Branchiopoda: Anostraca) (1995)
    Springer
    Hydrobiologia 298 (1995), S. 15-44 
    Details
    ISSN: 1573-5117
    Keywords: Streptocephalus ; morphology ; systematics ; North America ; new species ; cladistics ; fairy shrimp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We present an updated diagnosis of 13Streptocephalus species of North America. Three new species are included. A key to the species is provided. The phylogeny of the group is discussed on the basis of (1) a systematic approach (Maeda-Martinezet al., 1995; this volume), which considers the entire distal antennal outgrowth, the frontal appendage, and the morphology of the ovaries as essential in defining different genetic lineages or species-groups, and (2) a cladistic analysis. We suggest that of nine monophyletic groups, three are represented in both the Old and New World. Thus, contrary to former disparsalist hypotheses, we argue that the New World species represent relict forms of ancestral groups fragmented by continental drift (vicariance model).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00033798
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  • 4
    Electronic Resource
    Electronic Resource
    New records of large branchiopods (Branchiopoda: Anostraca, Notostraca, and Spinicaudata) in Mexico (1997)
    Springer
    Hydrobiologia 359 (1997), S. 63-69 
    Details
    ISSN: 1573-5117
    Keywords: geographical distribution ; fairy shrimp ; tadpole shrimp ; clam shrimp ; Lepidurus ; Cyclestheria ; coloration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This paper reports new distribution records of large branchiopods for Mexico following a three year survey of the Baja California peninsula. The occurance of the anostracans Thamnocephalus mexicanus (Linder, 1941) and T. platyurus (Packard, 1877), the notostracan Lepidurus lemmoni (Holmes, 1894), and the spinicaudatans Eulimnadia cylindrova (Belk, 1989) and E. texana (Packard,1871), all represent the first records for the peninsula. An undescribed species of the anostracan genus Streptocephalus is recorded from the state of Baja California (Norte). The occurrence of the notostracan genus Triops and four other anostracan species on the peninsula is also confirmed. The conchostracan Cyclestheria hislopi (Baird, 1859) is recorded from the state of Quintana Roo. The collections of Lepidurus and Cyclestheria are the first records for México. These records increase the number of species of large branchiopods reported fromMéxico to 36: 20 Anostraca, 3 Notostraca, 11 Spinicaudata, and 2Laevicaudata.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003142332493
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  • 5
    Electronic Resource
    Electronic Resource
    Food dependent color patterns inThamnocephalus platyurus Packard (Branchiopoda: Anostraca); a laboratory study (1995)
    Springer
    Hydrobiologia 298 (1995), S. 133-139 
    Details
    ISSN: 1573-5117
    Keywords: β-carotene ; baker's yeast ; growth ; survival
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Coloration of phyllopods varies from place to place and from one life stage to another. It ranges from translucent or whitish through gray, blue, green, orange, and reddish. Here, we present experimental evidence for a food- dependent color pattern inThamnocephalus platyurus Packard. The presence or absence of the synthetic pigment trans — β — carotene in a baker's yeast diet was the controlling factor. All the 24 old larvae used in the experiment were whitish in color. From day 6 until the end the experiment (day 11), 100% of the shrimps under a diet with synthetic trans — β — carotene (treatment 1) exhibited a characteristic color pattern which consisted of an orange color in the cercopods, and in all theracopods; the rest of the body exhibited no particular color. In comparison, 100% of the shrimps under a diet without synthetic trans — β — carotene (treatment 2) were whitish throughout the body. In females from treatment 1, the ovaries and oocytes were green-bluish, while in females from treatment 2 the ovaries and oocytes were whitish. No significant differences in survival and growth were found, except that at day 9, there was a significant difference in growth, the females with the synthetic trans — β — carotene group growing faster.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00033808
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  • 6
    Electronic Resource
    Electronic Resource
    Laboratory culture of fairy shirmps using baker's yeast as basic food in a flow-through system (1995)
    Springer
    Hydrobiologia 298 (1995), S. 141-157 
    Details
    ISSN: 1573-5117
    Keywords: Thamnocephalus ; Branchinecta ; growth ; filter-feeders ; feeding ; clay ; silicium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We designed and standardized a culture method for freshwater anostracans using diets free of live algae.Thamnocephalus platyurus andBranchinecta lindahli were used as test organisms. We used baker's yeast as basic food and added inert particles (clay or amorphic silicium dioxide) to improve the digestion of the yeast. A flow-through culture system was used, according to a fixed feeding schedule, to supply separately, culture medium (tap water), food, and inert particle suspensions. Three variants with baker's yeast as basic, food were compared for survival, growth, and reproduction. A diet of solely baker's yeast (diet 1) or baker's yeast supplemented with vegetal oil containing ß-carotene (diet 2) was unsuitable for reproduction ofT. platyurus. Cyst production was only achieved when diet 2 was supplemented with fish oil andSpirulina powder (diet 3). This suggests that not only a digestibility problem, but also nutritional deficiencies are present in baker's yeast.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00033809
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  • 7
    Electronic Resource
    Electronic Resource
    A contribution to the systematics of the Streptocephalidae (Branchiopoda: Anostraca) (1995)
    Springer
    Hydrobiologia 298 (1995), S. 203-232 
    Details
    ISSN: 1573-5117
    Keywords: Streptocephalus ; morphology ; classification ; phylogeny ; fairy shrimp ; phyllopod
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract While developing a data base for phylogenetic analysis of the New World streptocephalids we compaired them with species from Africa, Europe, and India. In doing this, we found that the morphology of the peduncle of the distal antennal outgrowth and the biramous ovaries developed in seven North American species can contribute to the systematics of the genus. Thus, our investigation consisted of (1) a review of the external morphology of the antenna, (2) biometry of selected parts of the antenna to obtain informative ratios, (3) a review of the presence or absence of genetal linguiform outgrowths, extension of the non-retractile parts of the penes, and general morphology of the cercopods, (4) a study of the location of the ovaries, and extension of the brood-pouch. On the basis of the results we classifyStreptocephalus into nine species groups. Five subgroups are identified within two of the species groups Several implications of the present approach are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00033815
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  • 8
    Electronic Resource
    Electronic Resource
    Historical biogeography and morphological differentiation ofStreptocephalus torvicornis (Waga) since the Würm III-glaciation (1995)
    Springer
    Hydrobiologia 298 (1995), S. 281-286 
    Details
    ISSN: 1573-5117
    Keywords: S. torvicornis ; biogeography ; pleistocene history ; subspeciation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We argue that the Würm III glaciation eradicated possible European populations ofS. torvicornis, and that today, a reconquest of Europe takes place on two fronts. A western wave has reached the Pyrenees, an eastern one now occupies most of eastern and northern Europe. The western route probably started in the Maghreb, the eastern one in the Levant and the Ponto-Caspian. Animals in the west had to move north by crossing, at right angles, a series of east-west oriented river valleys and progressed slowly; animals in the east could move up river valleys extending north-east, and moved quickly. Italy was not occupied, becauseS.torvicornis is a warm stenotherm, and by the time the climate had warmed sufficiently for it to reach the southern shore of the mediterranean (ca 6000 BP), the gap with Italy was probably too large for a crossing. Cold-loving species (of the generaBranchipus, Chirocephalus) conversely, and could freely flow across the Central Mediterranean at low sea-levels (ca 12000 BP), and now occur in Italy (and the rest of Europe) as well as in Northern Africa. A prediction of our hypothesis is that the pioneer populations in Spain and Central Europe should have been isolated longest. Thisis tested and confirmed by their comparative morphology, and two subspecies,S. t. torvicornis andS. t. bucheti are reinstated. A gap across the Nile Valley where onlyS. rubricaudatus seems to occur, deserves further study.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00033822
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  • 9
    Electronic Resource
    Electronic Resource
    Large branchiopod assemblages common to Mexico and the United States (1997)
    Springer
    Hydrobiologia 359 (1997), S. 45-62 
    Details
    ISSN: 1573-5117
    Keywords: Crustacea ; Branchiopoda ; community ecology ; sympatry ; co-occurrence ; temporary pools
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We present observations on the frequency of large branchiopod associations found in north-central Mexico, and in Arizona, USA. Of a total of 25 species involved in these assemblages, 12 were common in both areas. Fifty-eight (43.3%) of the ponds in Mexico, and seventy-eight (47%) of those in Arizona had two or more species present. The combinations of species which occurred with highest frequency were Streptocephalus mackini with Thamnocephalus platyurus for Arizona, and T. platyurus, Triops sp., and Leptestheria compleximanus for Mexico. In Mexico, and Arizona, as in many parts of the world, multispecies assemblages of large branchiopods are a common phenomenon. Therefore, the ’common rule‘ of’one-phyllopod-per-habitat‘ advanced by Weise (1964) is inconsistent with field observations. Furthermore, since cases of co-occurrence of two or more congeneric species of Anostraca and Notostraca are not uncommon, generalizations about congeners not coexisting remain applicable only for the Spinicaudata and Laevicaudata. On the basis of the literature, and of observations in the field and in the laboratory, we list potential factors contributing to the co-occurrence of several species within a pond.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003102601542
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  • 10
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    Diagnosis and phylogeny of the new world streptocephalidae (Branchiopoda: Anostraca) (1995)
    Springer
    Details
    Publication Date: 1995-02-01
    Print ISSN: 0018-8158
    Electronic ISSN: 1573-5117
    Topics: Biology
    Published by Springer
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