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Environmental drivers of the metacommunity structure of insects on the surface of tropical streams of the Amazon
Austral Ecology ( IF 1.5 ) Pub Date : 2020-02-28 , DOI: 10.1111/aec.12873
Erlane José Cunha 1 , Leandro Juen 2
Affiliation  

Understanding how species are distributed according to environmental and spatial variation is still one of the main issues in community ecology. We analysed the responses of semiaquatic bugs (Gerromorpha: Hemiptera) to environmental and spatial processes considered drivers of metacommunity structure in Amazonian streams. We tested the hypotheses that environmental variables determine the metacommunity structure and that the spatial structures, both dendritic and overland, are not representative of the metacommunity structure. Environmental variables and semiaquatic bugs were collected from 39 stream sites. Spatial variables were calculated in two configurations – overland and hydrographic distances between streams. We used partial redundancy analysis to test the relative importance of environment and space on the metacommunity structure, considering the two spatial configurations separately. The environmental variables were the metacommunity drivers in tropical streams, mainly structured by the depth, canopy, embeddedness and slope variables. Our results also indicate little or no dispersion limitation, as no spatial patterns were found. Thus, environmental selection determines the semiaquatic bugs' metacommunity structure due to the achievement of optimal habitats through dispersal. We also believe that dispersion cannot be ruled out as a metacommunity driver, since the peculiarities of the group show seasonal changes in dispersion ability, and spatial patterns may occur under different temporal scales.

中文翻译:

亚马逊热带溪流表面昆虫超群落结构的环境驱动因素

了解物种如何根据环境和空间变化进行分配仍然是社区生态学的主要问题之一。我们分析了半水生臭虫(Gerromorpha:半翅目)对环境和空间过程的响应,这些环境和空间过程被认为是亚马孙河流域中超群落结构的驱动因素。我们检验了以下假设:环境变量决定了元社区的结构,而树突状和陆上的空间结构都不代表元社区的结构。从39个溪流场收集了环境变量和半水生臭虫。空间变量以两种配置计算-陆上和溪流之间的水文距离。我们使用部分冗余分析来测试环境和空间在元社区结构中的相对重要性,分别考虑两个空间配置。环境变量是热带河流中的元社区驱动因素,主要由深度,冠层,埋深和坡度变量构成。我们的结果还表明几乎没有分散限制,因为没有发现空间图案。因此,环境选择决定了通过扩散获得最佳栖息地的结果,从而决定了半水生臭虫的群落结构。我们还认为,不能排除分散是一个元社区驱动因素,因为该组的特殊性显示了分散能力的季节性变化,并且空间模式可能在不同的时间尺度上发生。嵌入度和斜率变量。我们的结果还表明几乎没有分散限制,因为没有发现空间图案。因此,环境选择决定了通过扩散获得最佳栖息地的结果,从而决定了半水生臭虫的群落结构。我们还认为,不能排除分散是一个元社区驱动因素,因为该组的特殊性显示了分散能力的季节性变化,并且空间模式可能在不同的时间尺度上发生。嵌入度和斜率变量。我们的结果还表明几乎没有分散限制,因为没有发现空间图案。因此,环境选择决定了通过扩散获得最佳栖息地的结果,从而决定了半水生臭虫的群落结构。我们还认为,不能将分散作为元社区驱动因素,因为该组的特殊性显示了分散能力的季节性变化,并且空间模式可能在不同的时间尺度上发生。
更新日期:2020-02-28
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