lecture+15+community+ecology

Collective properties of those communities rather

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collective properties of those communities rather than building them out of two-species interactions, consider the properties of whole communities. Complementary, not contradictory
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Diversity Biological diversity is defined as the variety of life in all its forms, levels, and combinations. In addition to species diversity, it includes genetic, population, functional group, and ecosystem diversity. Species diversity is most relevant from a community perspective. Hunter Fraser discussed genetic diversity and its implications Diversity generally is thought to be a good thing it can affect how whole systems function, because diversity brings multiple ways of living, specialization, and perhaps a more efficient use of resources overall. Also high diversity means lower populations of most individual species and often protection against infectious disease. Plus diverse communities reflect (and sustain) a variety of products of evolution valuable for their own sake, and sometimes useful to humans as well.
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Forms of Diversity Richness and Evenness (Equitability) Richness is the number of species in a place; equitability is the relative abundance of those species. For example, consider two communities each with 100 individuals divided into 5 species. The abundances of those species is: Species Community 1 Community 2 1 20 95 2 20 2 3 20 1 4 20 1 5 20 1 These communities are equally rich, but community 1 is far more equitable than community 2
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Forms of Diversity Alpha, Beta, and Gamma
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