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Microsoft PowerPoint - Chapter53

Microsoft PowerPoint - Chapter53 - Community Ecology...

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1 Community Ecology Community Ecology Interactions within communities of organisms Outline 1. Key concepts 2. Ecosystems and communities 3. Competition, Predation, Commensalism, Mutualism, 4. Key Terms 5. Conclusions Key Concepts: 1. A habitat is the type of place where individuals of a species normally live 2. A community is defined as an assemblage of species living close enough together for potential interaction. 3. Every species in the community has its own niche 4. Interactions among species influence the structure of a community 5. Dominant species are those in a community that have the highest abundance or highest biomass (the sum weight of all individuals in a population). 6. Keystone species exert an important regulating effect on other species in a community.
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2 Ecosystems and Ecosystems and communities Ecosystem: all factors affecting an organism’s survival: abiotic and biotic Individuals of a species form populations living in a given habitat Several populations interact to form communities within a habitat Many communities + abiotic factors form an ecosystem Everything interacts! Each organism plays a Each organism plays a special role within a special role within a community community Competition Predation
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