Phylogenetic resolution and quantifying the phylogenetic diversity and dispersion of communities.
Phylogenetic resolution and quantifying the phylogenetic diversity and dispersion of communities.
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DOI：
10.1371/journal.pone.0004390
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发表时间：
2009
期刊：
影响因子：
3.7
通讯作者：
Swenson NG
中科院分区：
文献类型：
--
作者：
Swenson NG
保护生物学家和群落生态学家越来越多地开始量化物种组合中的系统发育多样性和系统发育分散度。在某些情况下，用于这种分析的系统发育树是完全分叉的，但在许多情况下，所使用的系统发育树包含未解决的节点(即多节)。在这类研究中缺乏系统发育的解决方案，虽然肯定不受欢迎，但很可能会继续下去，特别是对于那些分析具有数百到数千个分类群的不同群落和数据集的人。因此，在使用尚未完全解决的系统发育树的研究中，我们必须量化潜在的偏差和统计能力的损失。本研究旨在通过使用已解决的和逐渐“未解决的”系统发育来量化模拟群落的系统发育多样性和分散度，从而实现这两个目标。结果表明：(I)群落系统发育多样性和分散度的度量通常在系统发育的基础上对分辨率的丧失更敏感，而在末端对分辨率的丧失不那么敏感；(Ii)系统发育分辨率的丧失通常会导致假阴性结果而不是假阳性结果。
Conservation biologists and community ecologists have increasingly begun to quantify the phylogenetic diversity and phylogenetic dispersion in species assemblages. In some instances, the phylogenetic trees used for such analyses are fully bifurcating, but in many cases the phylogenies being used contain unresolved nodes (i.e. polytomies). The lack of phylogenetic resolution in such studies, while certainly not preferred, is likely to continue particularly for those analyzing diverse communities and datasets with hundreds to thousands of taxa. Thus it is imperative that we quantify potential biases and losses of statistical power in studies that use phylogenetic trees that are not completely resolved. The present study is designed to meet both of these goals by quantifying the phylogenetic diversity and dispersion of simulated communities using resolved and gradually ‘unresolved’ phylogenies. The results show that: (i) measures of community phylogenetic diversity and dispersion are generally more sensitive to loss of resolution basally in the phylogeny and less sensitive to loss of resolution terminally; and (ii) the loss of phylogenetic resolution generally causes false negative results rather than false positives.
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