Consistency and variation in kelp holdfast assemblages: Spatial patterns of biodiversity for the major phyla at different taxonomic resolutions
Consistency and variation in kelp holdfast assemblages: Spatial patterns of biodiversity for the major phyla at different taxonomic resolutions
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DOI：
10.1016/j.jembe.2004.12.023
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发表时间：
2005-06-15
影响因子：
2
通讯作者：
Landers, TJ
中科院分区：
文献类型：
--
作者：
Anderson, MJ;Diebel, CE;Landers, TJ
本研究的重点是在几个空间尺度（从米到数百公里）上测量新西兰东北部海带群落动物生物多样性的自然空间变异性。本研究旨在验证钉螺群落中主要门（节肢动物、环节动物、软体动物和苔藓虫）在不同空间尺度上的多样性变化和生物多样性会以不同的方式发生显著变化的假设。生物多样性是根据丰富度、总丰度、结构组成（以Bray Curtis不相似度测量）和每个主要门和整个组合的分类宽度来考虑的。我们还研究了分类分辨率对多变量模式的影响。物种丰富度和总丰度随持林体积的增加而增加。所有门在最小空间尺度上的多变量变异最大，但不同门在不同空间尺度上表现出不同的多变量变异模式。在最大的空间尺度上，不同地点间的差异主要是由于苔藓虫和软体动物的组成和丰富度的差异。随着分类分辨率的降低，定位效应越来越不明显。在同一体积内，群落的丰富度和丰度差异不显著，不同地点间的分类宽度和门的比例丰度差异不显著。在没有环境影响的情况下，这些在大空间尺度上的一致性和其他研究的结果表明，新西兰系统中的固定式群落将提供一个有用的模型组合，可以通过组成门的比例变化来检测未来的影响。此外，在物种水平的小尺度和大尺度上发现的高变异性，特别是苔藓虫和软体动物，表明这些群落也可能为研究和了解海洋生物多样性的来源和功能提供独特的机会。(c) 2005 Elsevier b.v.版权所有
The focus of this study was to measure natural spatial variability in the biodiversity of fauna inhabiting kelp holdfasts in northeastern New Zealand at several spatial scales: from meters up to hundreds of kilometers. We wished to test the hypothesis that multivariate variation and biodiversity would vary significantly at different spatial scales in different ways for the major phyla in the holdfast community (Arthropoda, Annelida, Mollusca and Bryozoa). Biodiversity was considered in terms of richness, total abundance, structural composition (as measured by the Bray Curtis dissimilarity measure) and taxonomic breadth for each major phylum and for the assemblage as a whole. We also examined the effect of taxonomic resolution on multivariate patterns. Species richness and total abundance increased with increases in holdfast volume. Multivariate variation was greatest at the smallest spatial scale for all phyla, but different phyla showed different patterns of multivariate variation at different spatial scales. Variations among locations at the largest spatial scale were primarily due to differences in the composition and richness of bryozoans and molluscs. Location effects became less and less distinct with decreases in taxonomic resolution. There were very few significant differences in richness or abundance for holdfasts of a given volume, taxonomic breadth did not vary significantly across locations, nor did the proportional abundances of phyla. These consistencies across large spatial scales in the absence of environmental impacts and results from other studies suggest that holdfast communities in New Zealand systems would provide a useful model assemblage against which future impacts may be detected as changes in proportions of component phyla. In addition, high variability detected at small and large scales at the species level, especially for bryozoans and molluscs, suggest that these communities may also provide unique opportunities for studying and understanding sources and functions of marine biodiversity. (c) 2005 Elsevier B.V All rights reserved.