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  • 1
    Electronic Resource
    Electronic Resource
    Fish drift in a Danube sidearm-system: II. Seasonal and diurnal patterns (2004)
    Oxford, UK; Malden, USA : Blackwell Science Ltd
    Journal of fish biology 65 (2004), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Seasonal and diurnal patterns of larval and juvenile fish drift were investigated in the Marchfeldkanal, a man-made side branch of the Danube River near Vienna, Austria. A clear seasonal pattern with peak densities in mid-June was found. Species composition varied over time, showed a site specific pattern and was dominated by tubenose goby Proterorhinus marmoratus. Water temperature was the main factor responsible for the increase of drift densities until the median drift date and repeated occurrence of early larval stages in drift indicated repeated spawning for many species. Significant differences in drift densities between different time periods of the day (day, dusk, night and dawn) were found for common bream Abramis brama, barbel Barbus barbus, chub Leuciscus cephalus, tubenose goby and roach Rutilus rutilus. The highest drift rates occurred at night (2200–0400 hours), with 86% of all larvae drifting during the hours of darkness. Fish larvae of different lengths drifting at different phases of the day were found for common bream, bleak Alburnus alburnus and chub, with largest larvae drifting during dusk (chub) and day (bleak and common bream). For bleak, all gudgeon species Gobio spp., tubenose goby, roach and for all cyprinid species combined, one 2 h night sample was found to be sufficient to predict the total 24 h drift.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.0022-1112.2004.00534.x
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  • 2
    Electronic Resource
    Electronic Resource
    Fish drift in a Danube sidearm-system: I. Site-, inter- and intraspecific patterns (2004)
    Oxford, UK; Malden, USA : Blackwell Science Ltd
    Journal of fish biology 65 (2004), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A total of 10 649 larval and juvenile fishes of 24 species were caught in the drift at Marchfeldkanal, a man-made side branch of the Danube River near Vienna, Austria, with tubenose goby Proterorhinus marmoratus being the dominant species. Distinct differences in inter- and intraspecific drift patterns among different sampling stations along the course of the channel were found. The percentage of the rheophilic and rheoparous ecological guild was highest at the inlet of the channel, where it is directly fed with water from the Danube. For individual species, significant differences in drift densities among sites were found for tubenose goby, barbel Barbus barbus, ide Leuciscus idus, roach Rutilus rutilus and for the two most abundant percids, the pike-perch Sander lucioperca and zingel Zingel zingel combined. The occurrence of larval and juvenile fishes in the drift was related to certain developmental stages and differed between species and sites. Most species (common bream Abramis brama, bleak Alburnus alburnus, gudgeon species Gobio spp., chub Leuciscus cephalus, ide and roach) occurred with highest densities at the earliest developmental larval stage, but some species (e.g. common bream and roach) were also found abundantly in drift at later developmental stages. Application of Ivlev‘s index of electivity as a drift index describing the propensity of the different species to drift, yielded the highest indices for the gudgeon species, common bream and bleak and the lowest for perch Perca fluviatilis, Prussian carp Carassius auratus gibelio and rudd Scardinius erythrophthalmus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.0022-1112.2004.00533.x
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  • 3
    Electronic Resource
    Electronic Resource
    Re-establishing and assessing ecological integrity in riverine landscapes (2002)
    Oxford UK : Blackwell Science Ltd.
    Freshwater biology 47 (2002), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. River–floodplain systems are among the most diverse and complex ecosystems. The lack of detailed information about functional relationships and processes at the landscape and catchment scale currently hampers assessment of their ecological status.2. Intensive use and alteration of riverine landscapes by humans have led to severe degradation of river–floodplain systems, especially in highly industrialised countries. Recent water-related regulations and legislation focussing on high standards of ecological integrity back efforts to restore or rehabilitate these systems.3. Most restoration projects in the past have suffered from a range of deficits, which pertain to project design, the planning process, the integration of associated disciplines, scaling issues and monitoring.4. The so-called `Leitbild' (i.e. a target vision) assumes a key role in river restoration and the assessment of ecological integrity in general. The development of such a Leitbild requires a multistep approach. Including explicitly the first step that defines the natural, type-specific reference condition (i.e. a visionary as opposed to an operational Leitbild), has great practical advantages for restoration efforts, primarily because it provides an objective benchmark, as is required by the European Water Framework Directive and other legal documents.5. Clearly defined assessment criteria are crucial for evaluating ecological integrity, especially in the pre- and postrestoration monitoring phases. Criteria that reflect processes and functions should play a primary role in future assessments, so as to preserve and restore functional integrity as a fundamental component of ecological integrity.6. Case studies on the Kissimmee River (U.S.A.), the Rhine River (Netherlands and Germany), and the Drau River (Austria) are used to illustrate the fundamental principles underlying successful restoration projects of river–floodplain systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2427.2002.00914.x
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  • 4
    Electronic Resource
    Electronic Resource
    Bovine β-mannosidase deficiency
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 173 (1990), S. 491-495 
    Details
    ISSN: 0006-291X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0006-291X(05)80060-9
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  • 5
    Electronic Resource
    Electronic Resource
    Bovine β-mannosidase deficiency
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 173 (1990), S. 491-495 
    Details
    ISSN: 0006-291X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0006-291X(05)80060-9
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  • 6
    Electronic Resource
    Electronic Resource
    Rearing of Danube salmon (Hucho hucho L.) fry at different temperatures, with particular emphasis on freeze-dried zooplankton as dry feed additive
    Amsterdam : Elsevier
    Aquaculture 77 (1989), S. 363-371 
    Details
    ISSN: 0044-8486
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0044-8486(89)90220-2
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  • 7
    Electronic Resource
    Electronic Resource
    Morphology alone does not make an isochromosome (1986)
    Springer
    Human genetics 〈Berlin〉 72 (1986), S. 253-255 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Isochromosomes are chromosomes with genetically identical arms. Chromosomes morphologically similar to isochromosomes can arise from alternative mechanisms: wholearm translocations and crossing over within inversion loops. Cases are presented which could have arisen by each of these latter two mechanisms. The first case is 46,XX,t(15;15) (qtercen-qter; pter-cen-pter) and the second 46,XY,rec(18), dup q,inv(18)(p11.32q11.2).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00291889
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  • 8
    Electronic Resource
    Electronic Resource
    River restoration concepts — goals and perspectives (1995)
    Springer
    Hydrobiologia 303 (1995), S. 183-194 
    Details
    ISSN: 1573-5117
    Keywords: river restoration ; revitalization ; river management ; ecological improvement
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract An analysis of restoration projects carried out both in Austria and abroad shows that most projects are limited to design measures within the river bed with the general intention to increase habitat diversity. The various measures are not based on the type-specific characteristics of the river and thus there is a danger of creating uniform restoration stretches, independent of the specific landscape area, river morphology, discharge regime or site specific biocoenoses. Such proceeding lacks in considering a comprehensive improvement of ecological functioning of the whole river-system. To meet those demands a type-specific guiding view (‘Leitbild’) has to be developed based on the pristine river conditions. The comparison of the river pattern including the characteristic features of its unmodified state with the actual situation leads to a comprehensive set of measures. The essential goals of such management-concepts are the integrity of the river habitat, self-regulation and self-regeneration, the preservation of intact resources, as well as the possibility to experience the uniqueness, diversity and beauty of natural river landscapes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00034055
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  • 9
    Electronic Resource
    Electronic Resource
    The effects of recreated instream and ecotone structures on the fish fauna of an epipotamal river (1995)
    Springer
    Hydrobiologia 303 (1995), S. 195-206 
    Details
    ISSN: 1573-5117
    Keywords: river restoration ; instream structures ; land/water ecotone ; fish fauna
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Investigations of fifteen sections of seven Austrian epipotamal (barbel region) streams between 1981 and 1984 demonstrate the impact of instream river bed structures on fish communities. Reduced spatial heterogeneity due to river straightening resulted in decreasing species number, diversity, stock density and biomass. Reincreased variability of the river bed in the frame of a subsequent restructuring project improved all community-specific values significantly within a 3-year investigation period (1988–1990). Besides the regained habitat variability in form of riffle pool sequences and other instream structures, the newly created riparian zones obviously provided important niches, e.g. as refuge areas during flooding and as nursery grounds for fish fry. The positive effects of the recreated land/water ecotone are discussed with respect to river restoration projects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00034056
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  • 10
    Electronic Resource
    Electronic Resource
    A multi-level concept for fish-based, river-type-specific assessment of ecological integrity (2000)
    Springer
    Hydrobiologia 422-423 (2000), S. 279-289 
    Details
    ISSN: 1573-5117
    Keywords: water quality ; assessment criteria ; biological hierarchy ; reference conditions ; MuLFA ; Austria ; Europe
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We propose a multi-level concept for fish-based assessment (MuLFA) of the ecological integrity of running waters. This concept is designed for large-scale monitoring programmes such as required for the proposed Water Framework Directive of the EU. Out of five different biological organisation levels (fauna, community, guild, population and individual), we propose seven criteria: River-type-specific species, species with self-sustaining populations, fish region, number of guilds, guild composition, population size and population age structure. The principle of the MuLFA is based on assessing the deviation from undisturbed reference conditions. Reference conditions have to be compiled for every distinct river type using historical fish and abiotic data, present river-type-specific reference sites and reference models. The final assessment procedure is done by comparing the assessment reach with the reference conditions using a 5-tiered normative scheme and assigning that reach to the level of highest coincidence. The benefit of the MuLFA is its potential for consistent sensitivity to low- and high-dose human alterations, and due to its general character, its adaptability to all river types.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017038820390
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