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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Source pool geometry and the assembly of continental avifaunas
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Source pool geometry and the assembly of continental avifaunas

机译：源池的几何形状和大陆动物群的组装

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Classical niche-assembly models propose that the composition of biotic communities in continental landscapes is determined chiefly by the autecology of species, interspecific competition, and the diversity of resources and habitats within a region. In contrast, stochastic models propose that simulation algorithms can replicate the macroecological patterns, if not the mechanisms, of community assembly. Despite fundamental differences in assumptions, both categories of models assume that species are drawn from regional source pools. We explored the implications of source pool geometry on the assembly of avian communities with an analysis of assemblage dispersion fields, which can be visualized by overlaying the geographic ranges of all species that occur in an assemblage. Contours of species richness surrounding focal quadrats illustrate the decay rate of assemblage similarity with distance and the probable geometry of assemblage source pools. We used a geographic database for 2,891 species of South American birds to characterize dispersion fields for assemblages sampled by 1° latitude-longitude quadrats (n = 1,676). We show that the median range size of dispersion fields varies by an order of magnitude across the continent. Because abundance generally correlates with geographic range size within taxonomic groups, the number of individuals per species in avifaunal source pools must also vary by an order of magnitude. Most significantly, dispersion field geometry was surprisingly asymmetrical and exhibited complex geographical patterns that were associated with the distribution of biomes. These results are broadly consistent with the predictions of niche-assembly models but offer little support for stochastic assembly models.
机译：古典的生态位组装模型提出，大陆景观中的生物群落的组成主要取决于物种的自学，种间竞争以及区域内资源和栖息地的多样性。相反，随机模型提出，仿真算法可以复制社区组装的宏观生态模式，如果不是机制的话。尽管假设存在根本差异，但这两种模型都假设物种均来自区域性资源库。我们通过分析集合散布场来探索源池几何形状对鸟类群落聚集的影响，可以通过覆盖集合中所有物种的地理范围来可视化。焦点四足动物周围物种丰富度的轮廓显示了组合相似度随距离的衰减率以及组合源池的可能几何形状。我们使用了2,891种南美鸟类的地理数据库来表征以1°经度-正交（n = 1,676）采样的组合的色散场。我们表明，在整个大陆上，色散场的中值范围大小变化了一个数量级。因为丰度通常与分类组内的地理范围大小相关，所以航空动物源库中每个物种的个体数量也必须相差一个数量级。最重要的是，色散场的几何形状出奇地不对称，并表现出与生物群落分布相关的复杂地理模式。这些结果与利基装配模型的预测基本一致，但对随机装配模型几乎没有支持。

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