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首页> 外文期刊>Marine ecology progress series >Additive partitioning of estuarine benthic macroinvertebrate diversity across multiple spatial scales
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Additive partitioning of estuarine benthic macroinvertebrate diversity across multiple spatial scales

机译：河口底栖大型无脊椎动物多样性在多个空间尺度上的加性划分

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摘要

Knowledge of how diversity changes across spatial scales is important for conservation of biodiversity. Alpha (α), beta (β) and gamma (γ) species richness and Shannon-Wiener diversity index (H') of benthic macroinvertebrates were analysed by additive partitioning across 3 different nested spatial scales (cm, m and km scales) in the estuarine Baltic Sea-North Sea transition area. The data set consisted of abundance of 324 species from a total of 638 samples taken at 64 sites distributed over 6 salinity-defined regions. Results were compared to a null model, randomly assigning individuals of species among samples. β-richness among regions was significantly high and the major contributor to γ-richness, while α- and β-richness were less than expected at finer scales, suggesting that salinity-defined regions largely determined γ-richness. Salinity effects on α-richness were positive and most evident at a regional scale, likely reflecting differential evolutionary adaptation to salinity among species. For H', the greatest contribution to γ-diversity was from α and β at the finest scale, but significantly high contributions at larger scales likely indicated that different species dominated abundance in different sites and regions. Effects of rare species on partitioning of total richness was less different from random, compared to common species, for β among regions, suggesting that the occurrence of rare species was more affected by chance than for common species. Results suggest that additive partitioning is a simple and effective tool to unravel changes and sources in diversity over spatial scales in marine and/or estuarine benthic environments. This method may be used to assess effects of habitat homogenisation and as a basis for the design of conservation protocols.
机译：了解多样性如何在空间尺度上变化对于保护生物多样性很重要。通过在3个不同的嵌套空间尺度（cm，m和km尺度）中累加分配，分析底栖大型无脊椎动物的α（α），β（β）和γ（γ）物种丰富度和Shannon-Wiener多样性指数（H'）。河口波罗的海-北海过渡区。数据集由分布在6个盐度定义区域的64个地点的总共638个样本中的324种物种组成。将结果与无效模型进行比较，该模型将样本中的物种个体随机分配。区域之间的β富集度非常高，并且是γ富集的主要贡献者，而α和β富集度在较小规模下低于预期，这表明盐度定义的区域很大程度上决定了γ富集度。盐度对α-富集度的影响是积极的，在区域范围内最为明显，这可能反映了物种间对盐度的不同进化适应。对于H'，对γ多样性的最大贡献来自最小尺度的α和β，但是在较大尺度上的显着高贡献可能表明，不同物种在不同位置和区域占主导地位。与普通物种相比，稀有物种对总丰富度分配的影响与普通物种相比，区域间的差异较小，这表明稀有物种的发生比普通物种受偶然性影响更大。结果表明，附加分区是一种简单有效的工具，可以揭示海洋和/或河口底栖环境在空间尺度上的变化和来源的多样性。该方法可用于评估栖息地均质化的影响，并作为保护方案设计的基础。

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