Variation among European beetle taxa in patterns of distance decay of similarity suggests a major role of dispersal processes
Variation among European beetle taxa in patterns of distance decay of similarity suggests a major role of dispersal processes
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DOI：
10.1111/ecog.03693
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发表时间：
2018-11-01
期刊：
影响因子：
5.9
通讯作者：
Baselga, Andres
中科院分区：
文献类型：
--
作者：
Gomez-Rodriguez, Carola;Baselga, Andres
组合相似性随空间距离的衰减可以用扩散限制和物种分选等机制来解释。为了了解他们的相对贡献，我们比较了衰减的动物区系相似性与空间距离，独立，与气候距离，21甲虫类群不同的传播能力和生态位，在欧洲南部和北方。甲虫区系的相似性与空间距离有关，但与气候距离无关，这表明扩散过程的优势而不是生态位的限制。在大多数类群中，南方动物群比北方动物群更不相似：较小的初始相似性和陡峭的距离衰减率。北部的距离衰减模式相对平坦，并且在各个类群之间非常相似，这表明只有良好的扩散者才能在冰川退缩后到达这些纬度。南北方距离衰减型的差异与南方距离衰减型的分类单元斜率和丰富度的纬度差异有关。也就是说，在类群的距离衰减模式类似平坦的南部和北部，纬度丰富度梯度是弱的。这种相关性再次指出，在欧洲甲虫的传播能力的差异作为一个主要的决定因素的speographic模式。这两个分散和生态位相关的特性解释南北坡的差异，但分散属性原来是更相关的初始相似性和距离衰减强度一起考虑时。我们的研究结果表明，要了解欧洲的多样性模式，密切相关的生物群体不能被假定为代理人，不同的历史地理区域应分别进行分析。具有讽刺意味的是，对南欧甲虫动物群的研究将有助于阐明控制北方纬度地区气候变化的过程。
The decay of assemblage similarity with spatial distance can be explained by alternative mechanisms: dispersal limitation and species sorting. To understand their relative contributions, we compare the decay in faunal similarity with spatial distance and, independently, with climatic distance, of 21 beetle taxa with varying dispersal abilities and ecological niches, in southern and northern Europe. Similarity in beetle faunas was associated to spatial but not to climatic distances, pointing to the preponderance of dispersal processes rather than niche constraints. In most taxa, southern faunas were more dissimilar than northern ones: smaller initial similarity and steeper distance decay rate. Distance decay patterns in the north were relatively flat and very similar across taxa, suggesting that only good dispersers would have reached those latitudes after the glacial retreat. The difference in distance decay patterns between north and south is correlated with the taxon's slope of the distance decay pattern in the south and with its latitudinal richness difference. That is, in taxa with distance decay patterns similarly flat in the south and the north, the latitudinal richness gradient is weak. This correlation points again to differences in dispersal ability as a major determinant of biogeographic patterns in European beetles. Both dispersal and niche-related characteristics explained north-south slope differences, but dispersal attributes turned out to be more relevant when initial similarity and distance decay strength were considered together. Our results show that, to understand diversity patterns in Europe, closely related biological groups cannot be assumed to be surrogates and regions with different historical biogeography should be analysed separately. Paradoxically, the study of beetle faunas of southern Europe will shed light on the processes controlling the recolonization of northern latitudes.