Biology 2483A Lecture : Ecology 18.docx

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Communities vary in the numbers and kinds of species they contain. Species diversity differs among communities due to variation in regional species pools, abiotic conditions, and species interactions. Species diversity at the local scale: we must ask two important questions. Communities vary drastically in their species richness and composition. We can explain this by considering the factors that control species membership. Distribution and abundance of species in communities depends on: regional species pools and dispersal ability (species supply/what can get there). Species that can disperse to the community pass through the first filter: abiotic conditions. Species that can tolerate the abiotic conditions in the community pass through the second filter: species interactions. Species restricted by and/or dependent on particular species interactions in the community pass through the third filter. These factors act as filters, which exclude species from (or include species in) particular communities.

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