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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Phylogenetic diversity ： ウィキペディア英語版 Phylogenetic diversity Phylogenetic diversity is a measure of biodiversity which incorporates phylogenetic difference between species. It is defined and calculated as "the sum of the lengths of all those branches that are members of the corresponding minimum spanning path",〔DP Faith. 1992. Conservation evaluation and phylogenetic diversity. Biological Conservation 61: 1-10〕 in which 'branch' is a segment of a cladogram, and the minimum spanning path is the minimum distance between the two nodes. This definition is distinct from earlier measures which attempted to incorporate phylogenetic diversity into conservation planning, such as the measure of 'taxic diversity' introduced by Vane-Wright, Humphries, and William.〔Vane-Wright, R. I., Humphries, C. J. & Williams, P. H. 1991. (1991). What to protect - systematics and the agony of choice. Biological Conservation, 55, 235-54. 〕 The concept of phylogenetic diversity has been rapidly adopted in conservation planning, with programs such as the Zoological Society of London's EDGE of Existence programme focused on evolutionary distinct species. Similarly, the WWF's Global 200 also includes unusual evolutionary phenomena in their criteria for selecting target ecoregions. Some studies have indicated that alpha diversity is a good proxy for phylogenetic diversity, so suggesting that term has little use,〔Rodrigues, A. S. L. & Gaston, K. J. 2002. Maximising phylogenetic diversity in the selection of networks of conservation areas. Biol. Conserv. 105, 103–111|〕 but a study in the Cape Floristic Region showed that while phylogenetic and species/genus diversity are very strongly correlated (R2 = 0.77 and 0.96, respectively), using phylogenetic diversity led to selection of different conservation priorities than using species richness. It also demonstrated that PD led to greater preservation of 'feature diversity' than species richness alone.〔Forest, F. et al. 2007. Preserving the evolutionary potential of floras in biodiversity hotspots. Nature 445, 757-760 http://www.nature.com/nature/journal/v445/n7129/full/nature05587.html〕 ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Phylogenetic diversity」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.