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Homogenization of the freshwater fish fauna of the biogeographic regions of Chile

机译：智利生物地理区淡水鱼类区系的均质化

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摘要

Studies at local and global scales have showed that fish freshwater communities are going through a process of biotic homogenization, due mainly to exotic species introduced from other regions, and to the extinctions or extirpations of native species. Here we analyze the compositional changes among the contiguous biogeographic regions of continental Chile, expecting an important homogenization for being contiguous. By means of the spatial turnover (βsubsim/sub index), we determined the patterns of the compositional change and biotic homogenization from “historical” (βsubsim,H/sub; calculated before the introduction of exotic species by post-European colonization) to “current” (βsubsim/sub,subC/sub; calculated after the introduction of exotic species carried out by European colonizers) time. The differential turnover (Δβsubsim/sub) exhibited an average of ?0.04 and showing a significant distribution, with a median different from zero (P??0.05). Our results indicate the regions are currently in an important homogenization process in comparison to those observed in studies between non-contiguous regions. This change is being influenced largely by the presence of exotic species and not by extirpations of native species affecting negatively the biosingularity of regions with a high degree of endemism.
机译：地方和全球范围的研究表明，鱼类淡水群落正经历生物同质化的过程，这主要是由于从其他地区引进的外来物种以及本地物种的灭绝或灭绝。在这里，我们分析了智利大陆相邻生物地理区域之间的成分变化，并期望该区域具有重要的均质性。通过空间周转率（β sim 指数），我们根据“历史”（β sim，H ）计算了组成变化和生物均质化的模式;欧洲后殖民时期引进外来物种的时间）到“当前”（β sim ， C ;欧洲殖民者引入外来物种后的时间）。差异营业额（Δβ sim ）的平均值为0.04，并且显示出显着的分布，中位数不为零（P <0.05）。我们的结果表明，与非连续区域之间的研究相比，这些区域目前处于重要的均质化过程中。这种变化很大程度上受到外来物种的存在的影响，而不受本地物种的灭绝的影响，这些物种对地方病高度流行的地区的生物奇异性产生负面影响。

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