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首页> 外文期刊>Ecology letters >Spatial heterogeneity reduces temporal variability in stream insect communities
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Spatial heterogeneity reduces temporal variability in stream insect communities

机译：空间异质性降低了溪流昆虫群落的时间变异性

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摘要

Although all natural systems are heterogeneous, the direct influence of spatial heterogeneity no most ecological variables is unknown. In many systems, spatial heterogeneity is positively correlated with both microhabitat refugia and species richness. Both an increased number of microhabitat refugia and the effects of statistical averaging via increased species richness should lead to an inverse relationship between spatial heterogeneity and variability in community composition. To test this prediction, I measured diversity and temporal variability of invertebrate communities in a northern New Hampshire stream along a natural gradient of spatial heterogeneity formed by variation in stream substrates. On average, there was a 42% decrease in community variability along a gradient of increasing heterogeneity. This pattern was robust to changes in metrics of both heterogeneity and community variability. There was also a significant positive relationship between taxon richness and spatial heterogeneity with predicted taxon richness increasing c. 1.5 * along the heterogeneity gradient. By resampling community abundance data, I estimated that statistical averaging accounted for only 4% of the observed decrease in community variability in this study. I concluded that the remaining decrease was very likely explained by a greater number of refugia from predation and/or flooding in high-heterogeneity habitats. The results of this study suggest that maximizing heterogeneity in ecological restoration programmes may promote temporally stable and diverse communities and may aid in responsible management of aquatic resources.
机译：尽管所有自然系统都是异质的，但空间异质性的直接影响并不是大多数生态变量都未知。在许多系统中，空间异质性与微栖息地避难所和物种丰富度正相关。微型栖息地数量的增加和物种丰富度统计平均值的影响都应导致空间异质性与群落组成变异性之间的反比关系。为了检验这一预测，我测量了新罕布什尔州北部河流中无脊椎动物群落的多样性和时间变异性，该多样性和趋势是由河流底物变化形成的空间异质性自然梯度形成的。平均而言，随着异质性的增加，群落变异性降低了42％。这种模式对于异质性和社区变异性指标的变化均具有鲁棒性。随着预测的分类单元丰富度增加，分类单元丰富度与空间异质性之间也存在显着的正相关关系。沿非均质性梯度为1.5 *。通过对社区丰富度数据进行重新采样，我估计统计平均值仅占本研究中观察到的社区变异性下降的4％。我的结论是，剩余的减少很可能是由于高异质性栖息地中捕食和/或洪水引起的大量避难所造成的。这项研究的结果表明，最大限度地提高生态恢复计划中的异质性可能会促进时间稳定和多样化的社区，并可能有助于对水生资源进行负责任的管理。

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