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  • 1
    Electronic Resource
    Electronic Resource
    Predicting the structure and diversity of young-of-the-year fish assemblages in large rivers (1999)
    Oxford, UK : Blackwell Science, Ltd
    Freshwater biology 41 (1999), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: 1. Interactions between environmental variables and 0+ fish assemblages in the upper River Garonne (France) were quantified during late August 1995.2. The abundance and diversity of the fish assemblages in floodplain channels were modelled using Artificial Neural Network (ANN) analysis and nine variables: the abundance of the six dominant species, fish specific richness, overall abundance of 0+ fish and the Shannon index of diversity. Multiple regression analysis was also used to assess ANN performance.3. Using 596 samples, correlation coefficients (r adjusted) between observed and estimated values of the nine dependent parameters were all highly significant (P 〈 0.01). Expected values from the tested data were significantly related to the observed values. The correlation coefficient between observed and estimated values (r) varied from 0.70 to 0.85.4. The ANN provided a high quality prediction, despite the complex nature of the relationship between microhabitat composition and fish abundance.5. Garson’s algorithm was used to provide the explanatory power needed in ecology when using black-box models. Parameters contained in the models (i.e. weighting) were used to determine the relative contributions of explanatory variables and thus to ascertain the structure of fish communities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2427.1999.00423.x
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  • 2
    Electronic Resource
    Electronic Resource
    Movement of fish between a river and its backwater: diel activity and relation to environmental gradients (2003)
    Oxford, UK : Munksgaard International Publishers
    Ecology of freshwater fish 12 (2003), S. 0 
    Details
    ISSN: 1600-0633
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract –  Movements of fish, in particular roach Rutilus rutilus, perch Perca fluviatilis, rudd Scardinius erythrophthalmus, bleak Alburnus alburnus and chub Leuciscus cephalus (age ≥ 1+) in relation to environmental variables were examined between the River Morava, Czech Republic, and a rehabilitated former meander. Data were taken over seven 24-h periods in April–June 1997 using two back-to-back traps. Of 170 fish captured, 70% moved from the backwater to the river. Diel activity differed between sampling dates, but overall bleak, roach and chub moved mainly between dusk and dawn, whereas perch moved throughout most of the day. Rudd showed bi-modal (mid-day, midnight) activity. However, avoidance behaviour could have biased results for species known to be wary of traps. Water level changes, temperature and illumination were among the main environmental factors influencing fish movement, along with spawning migrations relevant for most species. In all specimens, over 65% individuals captured were ready to spawn. Most of them, except for perch, were moving out of the backwater towards the river.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1600-0633.2003.00014.x
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  • 3
    Electronic Resource
    Electronic Resource
    Comparative growth and diet of tench Tinca tinca (L.) larvae and juveniles from river floodplain biotopes in France and England (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Ecology of freshwater fish 2 (1993), S. 0 
    Details
    ISSN: 1600-0633
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The growth and diet of larvae and 0 + juveniles of riverine tench Tinca tinca (L.) were compared in two stagnant floodplain biotopes from the upper River Rhône, France, and the River Great Ouse, England. The diet of tench was generally similar at the French and English sites, with Cladocera being the predominant prey of young larvae (English site only). Cladocera and Copepoda were the principal prey of older larvae and 0 + juveniles, though the latter took a variety of other, larger prey items. Ontogenetic changes in diet at both sites probably reflect prey availability. Protracted spawning at the French site contrasted a single spawning effort in the English backwater. Fluctuations in growth rate and condition were observed to coincide with shifts in diet, suggesting that tench developing in riverine biotopes may be vulnerable to competition at particular transitional intervals in their early ontogeny.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0633.1993.tb00084.x
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  • 4
    Electronic Resource
    Electronic Resource
    First occurrence of the North American white sucker Catostomus commersoni in Great Britain (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 42 (1993), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The first specimen of white sucker Catostomus commersoni encountered in Great Britain is reported: a female of 320 mm s.l., 710 g wet body weight, estimated age of 3 +, and ripe with eggs (≃21% of the body weight). Isoelectric focusing of a tissue sampSe was also undertaken.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1993.tb00367.x
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  • 5
    Electronic Resource
    Electronic Resource
    Shifts in the microhabitat of larval and juvenile roach, Rutilus rutilus (L.), in a floodplain channel (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 36 (1990), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The microhabitat of roach larvae (stages L1–L6) and 0+ juveniles was examined in a braided channel (Ilon) of the Upper Rhone River, France, from weekly samples (spring-autumn 1985) using Point Abundance Sampling by electrofishing. During early development, microhabitat exploitation was characterized by two transitions: the first at larval step L3, when morphological and physiological attributes permit the active choice of microhabitat; the second at the end of the larval and start of the juvenile period. At larval step L3, and up to L5, roach were strongly associated with lentic waters of medium depth (0.5–1.0m) and with either macrophytes or ligneous debris. The L6 and 0+ juveniles were found more often than expected in shallower waters (〈 0.2m, 0.2–0.5 m) and were no longer associated with dense vegetation or ligneous debris. However, both larval (L3–L6) and 0+ juvenile roach preferred silty sand and/or silted gravel, and a lack of current. This shift, from moderately deep waters with vegetation and/or branches as larvae to open shallow waters as juveniles, demonstrates the young roach's perception and response to environmental change, with shallows exploited as a refuge from predation when protective structures become scarce or unavailable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1990.tb04322.x
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  • 6
    Electronic Resource
    Electronic Resource
    Early ontogenetic ecology of sofie Chondrostoma toxostoma: an integrated approach to organism-environment relationships (2005)
    Oxford, UK; Malden, USA : Blackwell Science Ltd
    Journal of fish biology 67 (2005), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The influence of early life development on the swimming performance of the endangered sofie Chondrostoma toxostoma was examined to highlight trends in organism-environment relationships. Sudden occurrences of change in integrated function were found and these were most decisive, in particular with respect to microhabitat use, between the larval and juvenile periods of development. Stabilization of relative growth, i.e. end of the remodelling process (metamorphosis), occurred well after all larval characteristics (remnants of finfold and rapid allometric growth) had disappeared and all juvenile structures had appeared (nasal septa and complete scale cover). The fact that stabilization of relative growth coincided with dramatic shifts in microhabitat use (organism needs) as well as in swimming capacity (organism skills) suggests a more ‘decisive’ type of change in organism-to-environment interaction than one purely of form, i.e. shift from nursery to adult habitat.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.0022-1112.2005.00914.x
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  • 7
    Electronic Resource
    Electronic Resource
    Do small riverine fish move inshore at night? (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 43 (1993), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: We tested the hypothesis that numbers of small fish increase along river banks with decreasing light levels. Fish were sampled every 3h over a 24-h period (30–31 August 1992) along two adjacent stretches of bank (one shallow sand, one steep boulder) on the R. Morava near Breelav, Czech Republic. The size of fish was significantly greater along the boulder bank than along the sand bank. Numbers of fish along the steep boulder bank did not increase with decreasing light levels, except in Rhodeus sericeus and perch Perca fluviatilis, which were significantly more abundant at night. Along the shallow sand bank, all species increased in number at night, most significantly so. As light levels decreased, numbers of whitefin gudgeon Gobio albipinnatus and roach Rutilus rutilus decreased along the boulder bank, as their numbers increased along the sand bank, suggesting a dusk migration to the sand bank to avoid predation. This assumption was corroborated by the significantly higher number of potentially piscivorous fishes (P. ftuviatilis and chub Leuciscus cephalus≥ 80 mm) along the boulder bank during the night.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1993.tb01190.x
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  • 8
    Electronic Resource
    Electronic Resource
    Recognition of cohorts and growth of larval and juvenile roach Rutilus rutilus (L.), using size-class ordination of developmental steps (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 36 (1990), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Roach larvae and 0+ juveniles were sampled weekly in three different floodplain channels (stagnant, semi-lotic, lotic) of the Upper Rhône River, France, from spring to autumn 1985 using Point Abundance Sampling by electrofishing. Length-frequency analysis by size-class ordination of developmental steps successfully distinguished both overlapping and non-overlapping histograms within the data matrix and revealed the temporal and spatial segregation of a number of cohorts, individuals born at a common site on the same day, which in some cases presented significant differences in standard length within a given developmental step. Despite these initial differences, the various cohorts converged to form one relatively homogeneous cohort around the moment of transition to the juvenile period. Significant differences in standard length were found between populations in the open lotic channel (relatively cooler) and those in the closed, stagnant (relatively warmer) former channel, suggesting that fish growth in isolated ecosystems is influenced by higher or periodically elevated temperatures and by greater levels of resource competition and predation. A similar pattern of differences in length was also observed in 0+ juvenile roach collected from 18 other floodplain channels of the Upper Rhône.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1990.tb05629.x
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  • 9
    Electronic Resource
    Electronic Resource
    Microhabitat use by 0+ and older fishes in a small English chalk stream (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 50 (1997), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The microhabitat use of two size/age classes of fish (0 +, ≥1+) in the River Lee, based on measurements of 14 environmental variables, was studied using point abundance sampling by electrofishing over the summer and autumn of 1995. Microhabitat use by all cyprinid species (barbel Barbus barbus, minnow Phoxinus phoxinus, chub Leuciscus cephalus and gudgeon Gobio gobio) differed between 0+ and older (≥1+) with lentic, shallow, littoral environments being important for 0+ fishes, whereas deeper, faster areas in mid-channel were important for ≥ 1 + fishes. There was more overlap in microhabitat use by 0+ juvenile cyprinids in the River Lee than in larger systems such as the River Danube (Slovakia/Hungary) and River Great Ouse (U.K.).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1997.tb01626.x
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  • 10
    Electronic Resource
    Electronic Resource
    Is fish condition correlated with water conductivity? (2003)
    Oxford, UK : Blackwell Science Ltd
    Journal of fish biology 63 (2003), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: There were no correlations between fish condition (K) and water conductivity in 14 species of 0+ year fishes in the River Great Ouse, U.K., catchment. Values of K increased with increasing distance from river source in dace Leuciscus leuciscus and roach Rutilus rutilus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1095-8649.2003.00145.x
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