http://scholars.ntou.edu.tw/handle/123456789/21294
標題: | Phylogenetic skew: a new index of community diversity | 作者: | Hung-yen Chen Kwang-Tsao Shao Hirohisa Kishino |
公開日期: | 2015 | 卷: | 24 | 期: | 4 | 起(迄)頁: | 759–770 | 來源出版物: | Molecular Ecology | 摘要: | The distribution of divergence times between member species of a community reflects the pattern of species composition. In this study, we contrast the species composition of a community against the meta-community, which we define as the species composition of a set of target communities. We regard the collection of species that comprise a community as a sample from the set of member species of the meta-community, and interpret the pattern of the community species composition in terms of the type of species sampled from the meta-community. A newly defined effective species sampling proportion explains the amount of the difference between the divergence time distributions of the community and that of the meta-community, assuming random sampling. We propose a new index of phylogenetic skew (PS), as the ratio of the maximum-likelihood estimate of the effective species sampling proportion to the observed sampling proportion. A PS value of 1 is interpreted as random sampling. If the value is >1, the sampling is suspected to be phylogenetically skewed. If it is <1, systematic thinning of species is likely. Unlike other indices, the PS does not depend on species richness as long as the community has more than a few members of a species. Because it is possible to compare partially observed communities, the index may be effectively used in exploratory analysis to detect candidate communities with unique species compositions from a large number of communities. |
URI: | http://scholars.ntou.edu.tw/handle/123456789/21294 | DOI: | 10.1111/mec.13064 |
顯示於: | 海洋生物研究所 |
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