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首页> 美国卫生研究院文献>Scientific Reports >Habitat connectivity and in-stream vegetation control temporal variability of benthic invertebrate communities
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Habitat connectivity and in-stream vegetation control temporal variability of benthic invertebrate communities

机译：生境连通性和河内植被控制底栖无脊椎动物群落的时间变异性

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One of the key challenges to understanding patterns of β diversity is to disentangle deterministic patterns from stochastic ones. Stochastic processes may mask the influence of deterministic factors on community dynamics, hindering identification of the mechanisms causing variation in community composition. We studied temporal β diversity (among-year dissimilarity) of macroinvertebrate communities in near-pristine boreal streams across 14 years. To assess whether the observed β diversity deviates from that expected by chance, and to identify processes (deterministic vs. stochastic) through which different explanatory factors affect community variability, we used a null model approach. We observed that at the majority of sites temporal β diversity was low indicating high community stability. When stochastic variation was unaccounted for, connectivity was the only variable explaining temporal β diversity, with weakly connected sites exhibiting higher community variability through time. After accounting for stochastic effects, connectivity lost importance, suggesting that it was related to temporal β diversity via random colonization processes. Instead, β diversity was best explained by in-stream vegetation, community variability decreasing with increasing bryophyte cover. These results highlight the potential of stochastic factors to dampen the influence of deterministic processes, affecting our ability to understand and predict changes in biological communities through time.
机译：理解β多样性的模式的主要挑战之一是将确定性模式与随机模式区分开。随机过程可能会掩盖确定性因素对社区动态的影响，从而阻碍对导致社区组成变化的机制的识别。我们研究了近14年的近原始北方河流中大型无脊椎动物群落的时间β多样性（年间差异）。为了评估观察到的β多样性是否偶然地偏离了预期的多样性，并确定了不同的解释性因素影响群落变异性的过程（确定性与随机性），我们使用了空模型方法。我们观察到，在大多数地点，时间β多样性较低，表明社区稳定性较高。当无法解释随机变化时，连通性是解释时间β多样性的唯一变量，弱连接的位点随时间表现出较高的群落可变性。在考虑了随机影响之后，连通性失去了重要性，这表明它与通过随机定殖过程产生的时间β多样性有关。取而代之的是，β多样性最好用河内植被来解释，群落变异性随苔藓植物覆盖率的增加而降低。这些结果突显了随机因素潜在地削弱确定性过程的影响，从而影响我们理解和预测生物群落随时间变化的能力。

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