BIOL 2060 Lecture Notes - Lecture 19: Log-Normal Distribution, Species Richness, Species Evenness
19 Apr 2016
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Document Summary
Regularities in abundance of species that hold across different communities: few species are rare, few species are abundance, most species are moderately abundant, the product of many random environmental variables acting upon populations. Impacts of the environment occurring randomly: minimal community structure. How individuals subdivide niche space avoid competition. The more you sample a community, the more species you will find: if the species has been observed in a previous quadrat, you wouldn"t record it"s presence in the next. Determines how many species present in a community. Biological diversity: genetic diversity range of alleles in a population, guilds number of groupings of animals, cultural diversity. Diff sub populations of whales having different communication: species diversity combination of species richness and evenness, habitat diversity, biome diversity. Shannon-wiener index (h") combines measures of richness and evenness. Pi = proportion of the ith species loge = natural logarithm of pi s = number of species in community: calculating h".
