BIOL 1001 Study Guide - Final Guide: Semibalanus Balanoides, Paramecium Aurelia, Intertidal Zone
18 Feb 2017
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Document Summary
Communities - assemblages of species living together in the same area: define the terms species richness , relative abundance and species diversity . Species richness # of species, e. g. all species in an area. Relative abundance - the proportion of all individuals belonging to each species, e. g. all plant species. Species diversity (or simply diversity ) - a combined measure of (1) and (2), e. g. all herbivores: use simpson"s index and its derivatives to quantify diversity and dominance in a community. Simpson"s index, d, is the probability of picking 2. = 0. 25 individuals at random that are the same species. The sum, d, is the proportion of individuals belonging to each species, pi, squared. pi can be found by ni /n. A measure of dominance (not diversity) is the tendency of 1 or a few species to have high relative abundance.
