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Unformatted text preview: Ch. 21 and 22 Community Structure Community a spatially defined area that includes all populations in that area complex interactions between populations Community Characteristics Biodiversity and biological structure o Species richness the number of species present in a community o Relative abundance the proportion of the total number of individuals in a community belonging to that species Typically a few species are common and most are rare o Species diversity the number of species present in a community AND the relative abundance Looks at the evenness of species o Dominants a single of a few species that predominate within a community Influence community in terms of biomass, space, energy flow, and nutrient cycling o Keystone species a species whose activities have a significant role in determining community structure. Small biomass in community Example: starfish in lab Beavers- changes environment and community by changing the landscape...
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