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Nicolas Lamouroux - One of the best experts on this subject based on the ideXlab platform.
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large scale intraspecific variation in life history traits of european Freshwater Fish
Journal of Biogeography, 2006Co-Authors: Aurelie Blanck, Nicolas LamourouxAbstract:Aims To test the magnitude and direction of the effects of large-scale environmental factors (latitude and habitat type: lotic or lentic) on the intraspecific variations in multiple life-history traits, across multiple European Freshwater Fish species. To test the relevance of defining species traits by quantifying the magnitude of interspecific vs. intraspecific variability in traits. Location Europe. Methods We obtained estimates of 11 Fish traits from published sources for 1089 populations of 25 European Freshwater Fish species. Traits were: longevity, maximal length, growth rate, asymptotic length, mortality rate, age and length at maturation, fecundity, egg size, gonadosomatic index, and length of breeding season. We described population habitats by latitude and habitat type (lotic or lentic), when available. For each species we tested the combined effect of latitude and habitat type on the intraspecific variation of each trait using analysis of covariance (ancova). We compared the intraspecific variation in traits with the variation between species using an analysis of variance (anova) for each trait, all species pooled. Results We found a consistent effect in direction of latitude on six traits, but we showed that this effect is not always significant across species. Higher-latitude populations often grew more slowly, matured later, had a longer life span and a higher maximal and asymptotic length, and allocated more energy to reproduction than populations at lower latitudes. By contrast, we noted only a slight effect of habitat type on the intraspecific variation in traits, except for Salmo trutta. All traits varied significantly between species. However, traits such as growth rate, mortality rate and length of breeding season varied more between populations than between species, whereas fecundity and traits associated with body length varied more between species. Main conclusions Latitude, in contrast to habitat type, is an important factor influencing several traits of geographically widely dispersed populations of multiple European Freshwater Fish species. Species traits that vary more between species than between populations are attractive variables for understanding and predicting the responses of stream Fish communities to their environment.
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Large‐scale intraspecific variation in life‐history traits of European Freshwater Fish
Journal of Biogeography, 2006Co-Authors: Aurelie Blanck, Nicolas LamourouxAbstract:Aims To test the magnitude and direction of the effects of large-scale environmental factors (latitude and habitat type: lotic or lentic) on the intraspecific variations in multiple life-history traits, across multiple European Freshwater Fish species. To test the relevance of defining species traits by quantifying the magnitude of interspecific vs. intraspecific variability in traits. Location Europe. Methods We obtained estimates of 11 Fish traits from published sources for 1089 populations of 25 European Freshwater Fish species. Traits were: longevity, maximal length, growth rate, asymptotic length, mortality rate, age and length at maturation, fecundity, egg size, gonadosomatic index, and length of breeding season. We described population habitats by latitude and habitat type (lotic or lentic), when available. For each species we tested the combined effect of latitude and habitat type on the intraspecific variation of each trait using analysis of covariance (ancova). We compared the intraspecific variation in traits with the variation between species using an analysis of variance (anova) for each trait, all species pooled. Results We found a consistent effect in direction of latitude on six traits, but we showed that this effect is not always significant across species. Higher-latitude populations often grew more slowly, matured later, had a longer life span and a higher maximal and asymptotic length, and allocated more energy to reproduction than populations at lower latitudes. By contrast, we noted only a slight effect of habitat type on the intraspecific variation in traits, except for Salmo trutta. All traits varied significantly between species. However, traits such as growth rate, mortality rate and length of breeding season varied more between populations than between species, whereas fecundity and traits associated with body length varied more between species. Main conclusions Latitude, in contrast to habitat type, is an important factor influencing several traits of geographically widely dispersed populations of multiple European Freshwater Fish species. Species traits that vary more between species than between populations are attractive variables for understanding and predicting the responses of stream Fish communities to their environment.
Li Hong - One of the best experts on this subject based on the ideXlab platform.
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Studies on protection measures of Freshwater Fish in south China
Journal of Xinyang Teachers College, 2002Co-Authors: Li HongAbstract:The cause of endangerment Freshwater Fish in south China was analyzed.Some suggestions on the protection those Freshwater Fish were put forward,including protecting the water environment,introducing the fine Fish and establishing the natural protection zone etc.
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Studies on Freshwater Fish in South China natural reserve
Journal of Xinyang Teachers College, 2001Co-Authors: Li HongAbstract:The Freshwater Fish in south China natural reserve was surveged.6 orders,20 families,68 genera and 106 species of Freshwater Fish have been found out.Parabotia banarescui has also been discoursed upon,becaue it is a new record in South China
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Studies on the Freshwater Fish fauna of South China
Journal of Xinyang Teachers College, 2000Co-Authors: Li HongAbstract:After summarizing the natural and geographical features of South China,the paper analyzed the fauna components of 323 Freshwater Fish in this region,and discussed the formation and development of Freshwater Fish fauna.
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Freshwater Fish investigation and biodiversity in Dapinshan Nature Reserve
Journal of Xinyang Teachers College, 2000Co-Authors: Li HongAbstract:This paper recorded 3 orders 7 families 13 genevas 14 species Freshwater Fishes environment analysed Fish fauna.Richness,uniformity, and diversity were analysed and compared at two different area.The paper also presented some suggestions on protection of Freshwater Fish.
Aurelie Blanck - One of the best experts on this subject based on the ideXlab platform.
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large scale intraspecific variation in life history traits of european Freshwater Fish
Journal of Biogeography, 2006Co-Authors: Aurelie Blanck, Nicolas LamourouxAbstract:Aims To test the magnitude and direction of the effects of large-scale environmental factors (latitude and habitat type: lotic or lentic) on the intraspecific variations in multiple life-history traits, across multiple European Freshwater Fish species. To test the relevance of defining species traits by quantifying the magnitude of interspecific vs. intraspecific variability in traits. Location Europe. Methods We obtained estimates of 11 Fish traits from published sources for 1089 populations of 25 European Freshwater Fish species. Traits were: longevity, maximal length, growth rate, asymptotic length, mortality rate, age and length at maturation, fecundity, egg size, gonadosomatic index, and length of breeding season. We described population habitats by latitude and habitat type (lotic or lentic), when available. For each species we tested the combined effect of latitude and habitat type on the intraspecific variation of each trait using analysis of covariance (ancova). We compared the intraspecific variation in traits with the variation between species using an analysis of variance (anova) for each trait, all species pooled. Results We found a consistent effect in direction of latitude on six traits, but we showed that this effect is not always significant across species. Higher-latitude populations often grew more slowly, matured later, had a longer life span and a higher maximal and asymptotic length, and allocated more energy to reproduction than populations at lower latitudes. By contrast, we noted only a slight effect of habitat type on the intraspecific variation in traits, except for Salmo trutta. All traits varied significantly between species. However, traits such as growth rate, mortality rate and length of breeding season varied more between populations than between species, whereas fecundity and traits associated with body length varied more between species. Main conclusions Latitude, in contrast to habitat type, is an important factor influencing several traits of geographically widely dispersed populations of multiple European Freshwater Fish species. Species traits that vary more between species than between populations are attractive variables for understanding and predicting the responses of stream Fish communities to their environment.
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Large‐scale intraspecific variation in life‐history traits of European Freshwater Fish
Journal of Biogeography, 2006Co-Authors: Aurelie Blanck, Nicolas LamourouxAbstract:Aims To test the magnitude and direction of the effects of large-scale environmental factors (latitude and habitat type: lotic or lentic) on the intraspecific variations in multiple life-history traits, across multiple European Freshwater Fish species. To test the relevance of defining species traits by quantifying the magnitude of interspecific vs. intraspecific variability in traits. Location Europe. Methods We obtained estimates of 11 Fish traits from published sources for 1089 populations of 25 European Freshwater Fish species. Traits were: longevity, maximal length, growth rate, asymptotic length, mortality rate, age and length at maturation, fecundity, egg size, gonadosomatic index, and length of breeding season. We described population habitats by latitude and habitat type (lotic or lentic), when available. For each species we tested the combined effect of latitude and habitat type on the intraspecific variation of each trait using analysis of covariance (ancova). We compared the intraspecific variation in traits with the variation between species using an analysis of variance (anova) for each trait, all species pooled. Results We found a consistent effect in direction of latitude on six traits, but we showed that this effect is not always significant across species. Higher-latitude populations often grew more slowly, matured later, had a longer life span and a higher maximal and asymptotic length, and allocated more energy to reproduction than populations at lower latitudes. By contrast, we noted only a slight effect of habitat type on the intraspecific variation in traits, except for Salmo trutta. All traits varied significantly between species. However, traits such as growth rate, mortality rate and length of breeding season varied more between populations than between species, whereas fecundity and traits associated with body length varied more between species. Main conclusions Latitude, in contrast to habitat type, is an important factor influencing several traits of geographically widely dispersed populations of multiple European Freshwater Fish species. Species traits that vary more between species than between populations are attractive variables for understanding and predicting the responses of stream Fish communities to their environment.
Rodolphe E Gozlan - One of the best experts on this subject based on the ideXlab platform.
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introduction of non native Freshwater Fish is it all bad
Fish and Fisheries, 2008Co-Authors: Rodolphe E GozlanAbstract:Riskperceptionsareimportanttothepolicyprocess,butthereisoftenawell-established pattern of small risks being over assessed. This is also true with the issue of non-native Freshwater Fish introductions, where a great majority of research focuses on the few negativecases.Theattitudetowards‘non-natives’isacontinuallyevolvingprocessand varies according to current societal values. Here I show that on the global scale, the majority of Freshwater Fish introductions are not identified as having an ecological impact while having great societal benefits. Case studies from the African lakes are discussed in order to illustrate contrasting outcomes following Fish introductions. Looking into the future, the environmental changes that Freshwater ecosystems may encounter will have inevitable implications on the distribution of our native Freshwater Fish species and the need to rely on non-native introductions may become a growing reality. Aquaculture production is regularly increasing and our dependence on it is likely to become greater as it provides an important substitute for the declining production of capture Fisheries. With it the number of Freshwater Fish introductions will increase and a more realistic attitude, albeit controversial, will need to be debated. This would mean protecting some introductions that present beneficial outcomes for biodiversity alongside a more systematic ban of species or families of Fish presenting a higher historical ecological risk. The public perception of risk is something which cannotbeignoredbyanygovernmentorrulingbody,butinordertogainpublicsupport in the fight for conservation of Freshwater Fish biodiversity, the message needs to be clear, detailed and educational.
Sebastien Brosse - One of the best experts on this subject based on the ideXlab platform.
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homogenization patterns of the world s Freshwater Fish faunas
Proceedings of the National Academy of Sciences of the United States of America, 2011Co-Authors: Sebastien Villeger, Simon Blanchet, Olivier Beauchard, Thierry Oberdorff, Sebastien BrosseAbstract:The world is currently undergoing an unprecedented decline in biodiversity, which is mainly attributable to human activities. For instance, nonnative species introduction, combined with the extirpation of native species, affects biodiversity patterns, notably by increasing the similarity among species assemblages. This biodiversity change, called taxonomic homogenization, has rarely been assessed at the world scale. Here, we fill this gap by assessing the current homogenization status of one of the most diverse vertebrate groups (i.e., Freshwater Fishes) at global and regional scales. We demonstrate that current homogenization of the Freshwater Fish faunas is still low at the world scale (0.5%) but reaches substantial levels (up to 10%) in some highly invaded river basins from the Nearctic and Palearctic realms. In these realms experiencing high changes, nonnative species introductions rather than native species extirpations drive taxonomic homogenization. Our results suggest that the “Homogocene era” is not yet the case for Freshwater Fish fauna at the worldwide scale. However, the distressingly high level of homogenization noted for some biogeographical realms stresses the need for further understanding of the ecological consequences of homogenization processes.
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partitioning global patterns of Freshwater Fish beta diversity reveals contrasting signatures of past climate changes
Ecology Letters, 2011Co-Authors: Olivier Beauchard, Sebastien Brosse, Fabien Leprieur, Pablo A Tedesco, Bernard Hugueny, Hans H Durr, Thierry OberdorffAbstract:Ecology Letters (2011) 14: 325-334 ABSTRACT: Here, we employ an additive partitioning framework to disentangle the contribution of spatial turnover and nestedness to beta diversity patterns in the global Freshwater Fish fauna. We find that spatial turnover and nestedness differ geographically in their contribution to Freshwater Fish beta diversity, a pattern that results from contrasting influences of Quaternary climate changes. Differences in Fish faunas characterized by nestedness are greater in drainage basins that experienced larger amplitudes of Quaternary climate oscillations. Conversely, higher levels of spatial turnover are found in historically unglaciated drainage basins with high topographic relief, these having experienced greater Quaternary climate stability. Such an historical climate signature is not clearly detected when considering the overall level of beta diversity. Quantifying the relative roles of historical and ecological factors in explaining present-day patterns of beta diversity hence requires considering the different processes generating these patterns and not solely the overall level of beta diversity.
