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Natural Science Spring 2008 #3

Natural Science Spring 2008 #3 - Tempering human...

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Tempering human environmental change We must understand community ecology which species are most essential to healthy ecosystem function Must identify the species role ( niche) Identify a “keystone” species exerts a large influence on community Keystone impacts: other species distribution, relative abundances and species richness Community Ecology Examine interaction’s effects on: Evolutionary response: adaptation 1 species abundance and distribution Total number of species 3 Types of Interactions Predation: one species eats another Symbiosis (mutualism): 2 species closely associate Interspecific Competition: 2 species use same non abundant resource Interactions Effect on community: Habitat: where species lives Resource: need to live, grow, reproduce Niche: species role: its use of resources (occupation) Resource partitioning: species use different set of resources or in different ways (locations, diets, and active periods)
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