If the number of species present in both communities is 12, and community 1 has 5 unique species and community 2 has 3 unique species, what is the Sorensen community similarity index?

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The Sorensen community similarity index is calculated as 2C / (A + B), where C is the number of species common to both communities, A is the total number of species in community 1, and B is the total number of species in community 2. Here, C = 12, A = 12 + 5 = 17, and B = 12 + 3 = 15. Thus, the index = 2*12 / (17 + 15) = 24 / 32 = 0.75.

If the Number of Species Present in Both Communities Is