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Latitudinal gradients of freshwater gastropods from the Western Palearctic

机译：西古北缘淡水腹足动物的纬度梯度

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摘要

We analysed changes in species richness and endemics of freshwater gastropods along the Western Palearctic, within the following boundaries: 10A degrees W-30A degrees E, 32A degrees N-71A degrees N. The aims of this study were to test: (1) the consistency of latitudinal distribution of Western Palearctic freshwater gastropods; and (2) the relationships between freshwater gastropods and environmental factors. Analyses were based on presence/absence data of 911 freshwater gastropod species in 474 sites, located along three bioclimas (boreal, Mediterranean and temperate) and four Koppen-Geiger climatic regions (arid, cold, polar and alpine, and temperate). Five environmental variables were used to assess their influence on the distribution of freshwater gastropods. Relationships between variables were studied using parametric, non-parametric and multivariate statistics, and general regression models. Species number per degree of latitude followed a hump-shaped curve, increasing to 41A degrees N-43A degrees N and, from there, decreasing to reach minimum values in boreal areas. Relationships between species richness and endemics with current and past environmental variables were likewise discussed.
机译：我们在以下边界内分析了西古太平洋上的淡水腹足类动物的物种丰富度和特有性的变化：10A度W-30A度E，32A度N-71A度N。本研究的目的是测试：（1）西部古太平洋淡水腹足类动物纬度分布的一致性； （2）腹足类动物与环境因素之间的关系。分析基于沿着三个生物气候（北方，地中海和温带）和四个Koppen-Geiger气候区（干旱，寒冷，极地和高山以及温带）的474个站点中911种淡水腹足动物的存在/不存在数据。使用五个环境变量来评估它们对淡水腹足动物分布的影响。使用参数统计，非参数统计和多元统计以及一般回归模型研究了变量之间的关系。每纬度的物种数量呈驼峰状曲线，增加到41A度N-43A度N，然后从那里减少到北方地区的最小值。同样讨论了物种丰富度和地方性与当前和过去环境变量之间的关系。

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