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Lecture 23: "Community Ecology II"

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Western University
Biology 1001A
Susanne Kohalmi

Biology Lecture No. 23: Community Ecology II th Wednesday, November 30 , 2011 Key Ideas: -Diversity, trophic levels, complexity -Patterns in diversity -Succession, disturbance, more diversity! Demonstrating Competition: -E.g. Chthalamus is a better competitor than Balamus which only exists in deeper waters, in the absence of Chthalamus. Species Richness, Species Diversity and Even Diversity: -Species Richness: Includes the number of different species in a given area. -Species Diversity: Includes an index that incorporates the number of species in an area and also their relative abundance. -Even Diversity: Includes the relative abundance or proportion of individuals among the species Trophic Levels: -The different classifications for organisms in an ecosystem based on their role as consumers. -Complex community: Many species per trophic level, and many trophic levels. -Complex communities are more stable as interconnected life-forms organize a more supportive foundation. Diversity & Keystone Species: -Keystone species have major effects (relative to the total abundance of species or total biomass) on an ecological community. -Keystone species often fall in the sub-category of keystone predators. -Such keystone predators often increase the species richness. Patterns In Species Behaviour: - Latitude (Tropics V.s Poles): Mor
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