BIOL208 Lecture Notes - Lecture 28: Alpine Tundra, Log-Normal Distribution, Species Evenness
18 Oct 2017
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Species abundance and diversity: dominance, diversity and abundance, environmental complexity, genetic diversity. Community structure: defined areas where different species are interacting (e. g, high alpine meadow in colorado, the number of species in the community and their relative abundance. Dominance: most abundant species (some communities do not have this, sometimes, dominance can be cryptic (underground or small organisms like ants, can count the number of species, look at biomass, percent cover. Lognormal distribution (fig 16. 4b, 16. 5b: some individuals are rare, common or moderate, this distribution is in different organisms, has a bell shaped curve, no matter what community we are measuring, this curve is present. This curve may be missing its first part due to sample size. Species diversity (fig 16. 6: metric which includes species richness (number of species) and species evenness (abundance of species, community a and b have same species richness, community a is dominated by white pine. Community b has an equal number of individuals of all species.
