Local contribution to beta diversity is negatively linked with community-wide dispersal capacity in stream invertebrate communities
Local contribution to beta diversity is negatively linked with community-wide dispersal capacity in stream invertebrate communities
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DOI：
10.1016/j.ecolind.2019.105715
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发表时间：
2020
影响因子：
6.9
通讯作者：
Fengqing Li;J. Tonkin;P. Haase
中科院分区：
文献类型：
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作者：
Fengqing Li;J. Tonkin;P. Haase
人们越来越清楚地认识到，流社区的本地生态位和区域扩散过程的调节，但这些因素与数据集，涵盖广泛的空间和时间尺度的全面测试是罕见的。基于2005 - 2012年德国中部低山区溪流1180个底栖无脊椎动物群落样本，我们检验了以下假设：1）当地对β多样性的贡献（LCBD：群落独特性的度量）将随着群落平均扩散能力的增加而下降; 2）由于研究区域的空间范围较大，区域扩散过程在构建群落组成时会优先于当地生态位控制。我们发现相当大的时间变化LCBD和LCBD和社区的扩散能力之间的负相关。然而，没有统计学上显着的相关性之间的物种贡献β多样性（SCBD）和物种扩散能力进行了观察。地点之间的大规模空间结构（代表扩散限制）对构建底栖生物群落很重要。虽然大部分的变化是由当地的过程和大尺度空间变量的共享效应解释的，在方差分配分析中，环境控制在少数情况下比区域过程更强，年平均温度和温度的平均日较差是重要的驱动因素。鉴于随着时间的推移，β多样性的高度变化的相关性，我们敦促研究人员不仅要关注多样性的空间变化，还要关注时间变化的背景。
It is increasingly well understood that stream communities are regulated by both local niche and regional dispersal processes, but comprehensive tests of these factors with datasets that cover extensive spatial and temporal scales are rare. Based on 1180 benthic invertebrate community samples from 2005 to 2012 in central low mountain streams of Germany, we tested the hypotheses that: 1) local contribution to beta diversity (LCBD: a measure of the uniqueness of communities) would decline with increasing average community dispersal capacity; and 2) owing to the relatively large spatial extent of the study region, regional dispersal processes would override local niche controls in structuring community composition. We found considerable temporal variation in LCBD and a negative correlation between LCBD and community dispersal capacity. However, no statistically significant correlation between species contribution to beta diversity (SCBD) and species dispersal capacity was observed. The large-scale spatial structure among locations (representative of dispersal limitation) was important in structuring benthic communities. Although much of the variation was explained by the shared effects of local processes and large-scale spatial variables, environmental controls were stronger than regional processes in few cases in the variance partitioning analysis, with the annual mean temperature and mean diurnal range of temperature being the important drivers. Given the highly varied correlates of beta diversity over time, we urge researchers to focus on not only spatial variation in diversity, but also the context of temporal variation.