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About: Morisita's overlap index     Goto   Sponge   NotDistinct   Permalink

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Morisita's overlap index, named after Masaaki Morisita, is a statistical measure of dispersion of individuals in a population. It is used to compare overlap among samples (Morisita 1959). This formula is based on the assumption that increasing the size of the samples will increase the diversity because it will include different habitats (i.e. different faunas). Formula: CD = 0 if the two samples do not overlap in terms of species, and CD = 1 if the species occur in the same proportions in both samples. Horn's modification of the index is (Horn 1966):