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首页> 外文期刊>Estuarine Coastal and Shelf Science >Multi-scale spatial variability in intertidal benthic assemblages: Differences between sand-free and sand-covered rocky habitats
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Multi-scale spatial variability in intertidal benthic assemblages: Differences between sand-free and sand-covered rocky habitats

机译：潮间带底栖组合的多尺度空间变异：无沙和覆砂岩石栖息地之间的差异

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摘要

The presence of high loads of sediment is often thought to be negatively associated with sessile species living on rocky reefs, leading to assemblages with low alpha diversity (average species richness) and beta diversity (heterogeneity). Here we examine the effects of sand deposition on rocky assemblages by contrasting the multivariate composition, spatial variation and alpha diversity between sand-free assemblages and assemblages covered by sand. The assemblage composition differed markedly between sand-covered and sand-free reefs, supporting the idea of that sedimentation is one of the major physical factors influencing the structure of benthic assemblages. More surprisingly, our findings suggest that sand-covered assemblages have greater spatial variation in terms of multivariate dispersion at small spatial scales (from metres to 100s of metres) than sand-free assemblages. No differences were detected between the two habitats in average species richness and Shannon diversity, whereas sand-covered assemblages were found to be taxonomically more diverse. Thus, the effects of sedimentation on the diversity of assemblages from rocky shores remain unclear and further investigation is needed to clarify its structuring role in combination with other environmental factors.
机译：人们通常认为，高沉积物含量与生活在礁石上的无柄物种呈负相关，从而导致低α多样性（平均物种丰富度）和β多样性（异质性）的组合。在这里，我们通过对比无沙组合物和被沙子覆盖的组合物之间的多元组成，空间变化和alpha多样性，研究了沙子沉积对岩石组合物的影响。在被沙覆盖的礁石和无沙礁石之间，组合物组成明显不同，这支持了这样的观点，即沉积是影响底栖组合物结构的主要物理因素之一。更令人惊讶的是，我们的发现表明，在小空间尺度（从米到100米）上，用沙子覆盖的组合物比无沙组合物具有更大的空间变异。在两个生境之间，在平均物种丰富度和香农多样性方面没有发现差异，而在沙子上的集合在分类学上被发现更加多样化。因此，沉积物对多岩石海岸组合多样性的影响尚不清楚，需要进一步研究以阐明其与其他环境因素结合的结构作用。

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