L15_15_Biodiversity

Consider this alternave community equus zebra simpsons

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Unformatted text preview: 1 – [(propor;on of species 1)2 + (propor;on of species 2)2 + … ] Now consider a different ecosystem with three species: Species A à༎ 33.3 % of all individuals Species B à༎ 33.3 % of all individuals Spceice C à༎ 33.3% of all individuals S = 1 – [ 0.3332 + 0.3332 + 0.3332 ] = 0.667 Simpson’s diversity index is a way to account for ‘commonness’ of different species: S = 1 – [(propor;on of species 1)2 + (propor;on of species 2)2 + … ] An ecosystem with ten species, each with equal abundance: S = 1 – [ 10 *(0.1)2] = 0.9 Simpson’s diversity index is an improvement, but it says nothing about diversity related to taxonomy or ecological func;on “Taxonomic diversity” is related to the number of higher taxonomic levels represented in an ecosystem Syncerus (buffalo) Gazella (gazelle) Connochaetes Tragelephas (wildebeest) (kudu) consider this community of African herbivores Simpson’s diversity index is an improvement, but it says nothing about diversity...
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This document was uploaded on 03/26/2014 for the course GEC AS.270.103 at Johns Hopkins.

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