Pathogenicity islands GC content often differs from that of the rest of the genome, and it is likely that these regions are spread among bacteria by a process of horizontal transfer.

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#Unit 10. Ecological Principles

The Shannon index Direct related with Diversity and increases with addition of species and even distribution of species.

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#Unit 10. Ecological Principles

The Brillouin index

Brillouin index discriminates between these two communities with same richness and evenness  and the Shannon index does not.

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#Unit 10. Ecological Principles

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#Unit 10. Ecological Principles

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#Unit 10. Ecological Principles

Evenness is a measure of how diverse a community is relative to the maximum possible diversity

E=Hs/Hmax

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#Unit 10. Ecological Principles

Regional diversity - Ecologists have often partitioned the overall species diversity of a region into different components.