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首页> 外文期刊>ICES Journal of Marine Science >Average functional distinctness as a measure of the composition of assemblages
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Average functional distinctness as a measure of the composition of assemblages

机译：平均功能差异作为组合组成的度量

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Indices are used to quantify change in the environment by reducing aspects of environmental complexity to numbers. Biodiversity indices are typically calculated using the numbers of species and their relative abundances. A recent advance has been the development of additional measures of diversity, such as phylogenetic diversity, based on relationships between organisms. The emerging paradigms of the importance of biodiversity to ecosystem services and the ecosystem approach to fishery management could be well served by the development of indicators of ecosystem functioning. We discuss how relatedness measures may be adapted to quantify aspects of community structure of relevance to ecosystem functioning, by combining information on species' occurrence, life history, and ecological traits. We present an index that reflects average functional distinctness within assemblages. We illustrate the approach using North Sea fish. Results reveal that average functional distinctness is not independent of taxonomic distinctness. This is expected, but the weakness of the relationship suggests that both indices may prove useful, because they are not constrained to convey the same information about samples. Both indices are shown to be weakly related to species richness, which was not expected. This is a consequence of differences in the frequencies of occurrence among species.
机译：指数用于通过将环境复杂性的方面减少为数字来量化环境的变化。生物多样性指数通常使用物种数量及其相对丰度来计算。最近的进展是基于生物之间的关系，开发了其他多样性措施，例如系统发育多样性。制定生态系统功能指标可以很好地解决生物多样性对生态系统服务的重要性和生态系统方法对渔业管理的重要性的新兴范式。我们将讨论如何通过结合物种的发生，生活史和生态特征的信息来调整相关性措施，以量化与生态系统功能相关的社区结构方面。我们提出了一个反映组件内部平均功能差异的索引。我们说明了使用北海鱼的方法。结果表明，平均功能差异并不独立于生物分类差异。这是预料之中的，但是关系的弱点表明这两个索引可能被证明是有用的，因为它们不被约束来传达关于样本的相同信息。这两个指数均显示出与物种丰富度之间的弱关联，这是没有预料到的。这是物种之间发生频率差异的结果。

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