ECOLOGY

by Purwaning Rohmah/BIO off A 2015 UM

DOMINANCE, EVENNESS, AND SPECIES RICHNESS

1. Dominance

Dominance is number of a species most probably higher than other species of an area, usually the species have a big role of that area. Measure of diversity which takes into account both richness and evenness of species. It is often used to quantify the biodiversity of a habitat. A community dominated by one or two species is considered to be less diverse than one in which several different species have a similar abundance.

2. Richness

Richness is a measure of the number of different kinds of organisms present in a particular area. The more species present in a sample, the 'richer' the sample. Species richness as a measure on its own takes no account of the number of individuals of each species present. It gives as much weight to those species which have very few individuals as to those which have many individuals.

3. Evenness

Evenness is a measure of the relative abundance of the different species making up the richness of an area and expresses how evenly the individuals in a community are distributed among the different species. It compares the similarity of the population size of each species present.