UMR 5119 "Ecosystèmes Lagunaires"-CNRS-IFREMER-UM2-IRD, Université Montpellier 2, Place Eugène Bataillon, 34095 Montpellier, France.
Ecol Lett. 2011 Apr;14(4):325-34. doi: 10.1111/j.1461-0248.2011.01589.x. Epub 2011 Feb 9.
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.
在这里,我们采用一种附加划分框架来区分空间周转率和嵌套性对全球淡水鱼类动物群β多样性模式的贡献。我们发现,空间周转率和嵌套性在其对淡水鱼类β多样性的贡献方面在地理上存在差异,这种模式是由第四纪气候变化的对比影响造成的。嵌套性特征的鱼类动物群之间的差异在经历了更大幅度的第四纪气候波动的流域中更大。相反,在历史上无冰川的流域中发现了更高水平的空间周转率,这些流域经历了更大的第四纪气候稳定性。当考虑整体β多样性水平时,并没有清楚地检测到这种历史气候特征。因此,要量化历史和生态因素在解释当今β多样性模式方面的相对作用,就需要考虑产生这些模式的不同过程,而不仅仅是整体β多样性水平。