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首页> 外文期刊>Journal of Biogeography >Habitat availability does not explain the species richness patterns of European lentic and lotic freshwater animals
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Habitat availability does not explain the species richness patterns of European lentic and lotic freshwater animals

机译：栖息地的可用性并不能解释欧洲的扁豆和抽水淡水动物的物种丰富度模式

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AimIn Europe, the relationships between species richness and latitude differ for lentic (standing water) and lotic (running water) species. Freshwater animals are highly dependent on suitable habitat, and thus the distribution of available habitat should strongly influence large-scale patterns of species richness. We tested whether habitat availability can account for the differences in species richness patterns between European lentic and lotic freshwater animals.LocationEurope.MethodsWe compiled occurrence data of 1959 lentic and 2445 lotic species as well as data on the amount of lentic and lotic habitats across 25 pre-defined biogeographical regions of European freshwaters. We used the range of elevation of each region as a proxy for habitat diversity. We investigated the relationships between species richness, habitat availability and habitat diversity with univariate and multiple regression analyses.ResultsSpecies richness increased with habitat availability for lentic species but not for lotic species. Species richness increased with elevational range for lotic species but decreased for lentic species. For both groups, neither habitat availability nor diversity could account for previously reported latitudinal patterns in species richness. For lotic species, richness declined with latitude, whereas there was no relationship between habitat availability and latitude. For lentic species, richness showed a hump-shaped relationship with latitude, whereas available habitat increased with latitude.Main conclusionsHabitat availability and diversity are poor predictors of species richness of the European freshwater fauna across large scales. Our results indicate that the distributions of European freshwater animals are probably not in equilibrium and may still be influenced by history, namely the recurrent European glaciations and possible differences in post-glacial recolonization. The distributions of lentic species appear to be closer to equilibrium than those of lotic species. This lends further support to the hypothesis that lentic species have a higher propensity for dispersal than lotic species.
机译：目的在欧洲，扁豆（静水）和抽水（自来水）物种的物种丰富度和纬度之间的关系不同。淡水动物高度依赖合适的栖息地，因此可用栖息地的分布应强烈影响物种丰富度的大规模模式。我们测试了栖息地的可用性是否可以解释欧洲lentic和lotic淡水动物之间物种丰富度模式的差异。方法欧洲我们收集了1959年lentic和2445个lotic物种的发生数据以及25个前期lentic和lotic栖息地数量的数据欧洲淡水的定义的生物地理区域。我们使用每个区域的海拔范围作为栖息地多样性的代表。我们通过单变量和多元回归分析研究了物种丰富度，栖息地可利用性和栖息地多样性之间的关系。抽水物种的物种丰富度随海拔范围的增加而增加，而扁豆物种的物种丰富度则下降。对于这两个群体，生境的可利用性和多样性都不能解释先前报道的物种丰富度的纬度格局。对于抽水物种，丰富度随纬度下降，而栖息地可利用度与纬度之间没有关系。对于小规模鱼类，丰富度与纬度呈驼峰状关系，而可用栖息地随纬度增加。主要结论栖息地的可用性和多样性是欧洲淡水动物大范围物种丰富度的不良预测指标。我们的结果表明，欧洲淡水动物的分布可能不均衡，并且仍可能受到历史的影响，即欧洲反复出现的冰川和冰川后再殖民化的可能差异。透镜状物种的分布似乎比乳液状物种的分布更接近平衡。这进一步支持了这样的假说，即透镜物种比散布物种具有更高的散布倾向。

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