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Compositional dissimilarity patterns of reptiles and amphibians in insular systems around the world

机译：全球岛屿系统中爬行动物和两栖动物的成分差异模式

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Several studies have shown that taxa with poor dispersal ability have a higher level of compositional dissimilarity than good dispersers. However, compositional dissimilarity patterns between islands with respect to dispersal ability of taxa have never been investigated before. In this study, we investigated compositional dissimilarity patterns of three taxonomic groups, namely amphibians, lizards, and snakes, differing in their dispersal abilities, in various insular systems around the world. We compiled presence-absence matrices, based on which we calculated several metacommunity indices to check for differences among taxonomic groups and island types (oceanic and continental shelf) using classical statistical tests and generalized linear mixed-effects models. According to our results, compositional dissimilarity was positively affected by the isolation of the insular system, in accordance to theory. In particular, oceanic systems were characterized by a high level of compositional dissimilarity between islands and subsequently by a low level of nestedness. SIEs may be generating these patterns causing distortions from expected levels of nestedness. Similar to our predictions, compositional dissimilarity patterns were also dependent on taxon-specific dispersal ability, with good dispersers showing lower levels of between-island compositional dissimilarity than poor dispersers in continental shelf systems. However, this pattern was not observed in oceanic systems. In conclusion, compositional dissimilarity in insular systems is dependent on both taxon and island type.
机译：多项研究表明，与良好的分散剂相比，​​具有较差的分散能力的分类单元具有更高的组成差异。但是，岛上之间的生物分类能力的分散模式从未被研究过。在这项研究中，我们调查了在世界各地的各种岛状系统中，三类分类群（两栖动物，蜥蜴和蛇）的成分差异性模式，它们的扩散能力不同。我们编译了不存在的矩阵，在此基础上，我们使用经典的统计检验和广义线性混合效应模型，计算了几个元社区指数，以检查分类群和岛屿类型（海洋和大陆架）之间的差异。根据我们的结果，根据理论，岛状系统的隔离对成分差异有积极影响。特别是，海洋系统的特点是岛屿之间的成分差异很大，随后的嵌套程度也很低。 SIE可能正在生成这些模式，从而导致预期嵌套级别的变形。与我们的预测相似，成分差异性模式也取决于分类群特定的分散能力，与大陆架系统中较差的分散剂相比，​​良好的分散剂显示出较低的岛间成分差异。但是，这种模式在海洋系统中没有观察到。总之，岛状系统的成分差异取决于分类群和岛屿类型。

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