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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 species evenness ： ウィキペディア英語版 species evenness Species evenness refers to how close in numbers each species in an environment is. Mathematically it is defined as a diversity index, a measure of biodiversity which quantifies how equal the community is numerically. So if there are 40 foxes, and 1000 dogs, the community is not very even. But if there are 40 foxes and 42 dogs, the community is quite even. The evenness of a community can be represented by Pielou's evenness index: :$J\text{'}=$ Where $H^\backslash prime$ is the number derived from the Shannon diversity index and $H\_\backslash max^\backslash prime$ is the maximum value of $H^\backslash prime$, equal to: :$H^\backslash prime\_\backslash max\; =\; -\; \backslash sum\_^S\; \backslash ln\; =\; \backslash ln\; S.$ ''J is constrained between 0 and 1. The less variation in communities between the species, the higher ''J is. Other indices have been proposed by authors where $H\_\backslash min^\backslash prime\; >\; 0$ e.g. Hurlburt's evenness index. S is the total number of species. == External links == * 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「species evenness」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.