Drivers of regional and local diversity of Amazonian stream Odonata
Drivers of regional and local diversity of Amazonian stream Odonata
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DOI：
10.1111/icad.12327
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发表时间：
2019-05-01
影响因子：
3.5
通讯作者：
Hortal, Joaquin
中科院分区：
文献类型：
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作者：
Alves-Martins, Fernanda;Calatayud, Joaquin;Hortal, Joaquin
大型亚马逊河可能会成为扩散能力低的动物的扩散障碍，限制它们在某些河间的分布。因此，这些类群的分布将受大气候梯度的影响较小。相反，高度分散的类群将不太受大河的限制，并可能跟踪合适的气候。我们评估是否Zygoptera和Anisoptera，两个蜻蜓亚目具有不同的传播能力，在整个亚马逊河河间的分布格局的差异。我们进一步评估的相对重要性，宏观气候和栖息地的因素，在他们的社区集会。我们使用网络模块化分析来识别生物地理物种库和空间缓冲区来定义元群落物种库。然后，我们使用结构方程模型来估计多尺度因子对物种丰富度格局的相对重要性。Zygoptera社区更相似的物种组成内比之间的河流，这表明大亚马逊河确实限制了Zygoptera物种的分布。相反地，异翅亚目的分布则横跨亚马逊河河间。季节性有很强的积极影响，在不同尺度上的Zygoptera和Anisoptera丰富度。此外，生境完整性与区域物种丰富度和异翅目物种丰富度呈负相关，与接合翅目物种丰富度呈正相关。栖息地完整性对异翅目和接合翅目的影响的对比表明，前者是在开放的栖息地，而后者是在森林中的青睐。尽管存在这些差异，这两个亚目似乎遵循类似的社区组装机制在亚马逊河流域，具有强大的气候控制跨尺度和当地社区的栖息地过滤器的效果。
Large Amazonian rivers may act as dispersal barriers for animals with low dispersal abilities, limiting their distribution to certain interfluves. Consequently, the distribution of these taxa would be less affected by macroclimatic gradients. Conversely, high-dispersal taxa would be less constrained by large rivers and may track suitable climates. We evaluate whether Zygoptera and Anisoptera, two Odonata suborders with different dispersal abilities, show differences in distribution patterns across Amazonian interfluves. We further assess the relative importance of macroclimatic and habitat factors in their community assembly. We used network modularity analyses to identify biogeographic species pools and spatial buffers to define metacommunity species pools. Then, we used structural equationmodels to estimate the relative importance of multi-scale factors on species richness patterns. Zygoptera communities are more similar in species composition within than between interfluves, suggesting that large Amazonian rivers indeed limit the distribution of Zygoptera species. Conversely, the distribution of Anisoptera extends across Amazonian interfluves. Seasonality has a strong positive effect on Zygoptera and Anisoptera richness across scales. In addition, habitat integrity is negatively correlated with the regional species richness and abundance of Anisoptera and positively correlated with Zygoptera local richness. The contrasting effects of habitat integrity on Anisoptera and Zygoptera suggest that the former is favored in open habitats, whereas the latter is so in forests. Despite these differences, both suborders appear to follow similar community assembly mechanisms in Amazonia, with a strong climatic control across scales and an effect of habitat filters on local communities.