Indices used to express rarity and diversity of habitats and fishes.
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Hk is the Shannon-Weaver index of entity k.Ni and Nj : Number of stations where the corresponding fish/habitat is absent.Ai: Abundance of fish specie i.Atot: Total abundance of all species.Sj: Surface of habitat j.Stot: Total surface of all habitats.
创建时间：
2015-12-02
