The structure of Congolese shrew ensembles: competition and spatial variation in resource abundance
The structure of Congolese shrew ensembles: competition and spatial variation in resource abundance
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刚果鼩鼱群体的结构：资源丰度的竞争和空间变化
DOI：
10.1093/jmammal/gyae032
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发表时间：
2024
影响因子：
1.7
通讯作者：
Erik Verheyen
中科院分区：
文献类型：
--
作者：
F. Van de Perre;M. Willig;S. Presley;H. Leirs;Erik Verheyen
种间竞争、环境过滤或生产力的空间差异可能导致种群(即由地理、资源利用和分类学定义的相互作用的种群)物种丰富度的正或负空间协方差。相反，密度补偿应导致生态形态相似性与群落内物种丰富度之间的负相关关系。我们评估了(1)21种刚果地鼠的配对关系是正向协方差还是负向协方差，以及(2)密度补偿是否表征了36种刚果地鼠群体的结构，并基于物种的丰度或生物量进行了评估。一般来说，基于丰度或生物量的考虑，正协方差比负协方差更常见，这表明环境过滤和生产力发挥了主导作用。然而，负协方差在生态形态相似的物种中更为常见，这表明功能群内的竞争起着主导作用。通过成对或扩散的竞争相互作用，丰度或生物量补偿的影响被偶然检测到的频率低于预期，这表明种间竞争不是构建这些集合的主要机制。竞争的影响可以通过对景观中不同地点或地点内不同生态位空间资源丰度变化的反应来平衡。未来对补偿效应的研究应考虑生态空间中资源丰度和分布的异质性，以便更好地分离竞争和资源丰度的影响，因为竞争和资源丰富可能对群落结构产生相反的影响。
Interspecific competition, environmental filtering, or spatial variation in productivity can contribute to positive or negative spatial covariance in the abundances of species across ensembles (i.e., groups of interacting species defined by geography, resource use, and taxonomy). In contrast, density compensation should give rise to a negative relationship between ecomorphological similarity and abundance of species within ensembles. We evaluated (1) whether positive or negative covariances characterized the pairwise relationships of 21 species of Congolese shrew, and (2) whether density compensation characterized the structure of each of 36 Congolese shrew ensembles, and did so based on the abundances or biomasses of species. In general, positive covariance is more common than negative covariance based on considerations of abundance or biomass, suggesting dominant roles for environmental filtering and productivity. Nonetheless, negative covariance is more common for ecomorphologically similar species, suggesting a dominant role for competition within functional groups. Effects of abundance or biomass compensation, via pairwise or diffuse competitive interactions, were detected less often than expected by chance, suggesting that interspecific competition is not the dominant mechanism structuring these ensembles. Effects of competition may be balanced by responses to variation in resource abundance among sites in a landscape or among niche spaces within sites. Future studies of compensatory effects should incorporate considerations of heterogeneity in the abundance and distribution of resources in ecological space to better isolate the effects of competition and resource abundance, which can have opposing effects on community structure.
生物量补偿：潮池鱼类多样性梯度的背后
影响因子：
1.7
作者：
S Arakaki;M Tokeshi
通讯作者：
M Tokeshi