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Week 12, Lecture 2, Community Ecology

Week 12, Lecture 2, Community Ecology - Community ecology...

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1 Lajoie –Communities ‘09 Community ecology An assembly of species in a habitat e.g. forest community, grassland community, bird community, mouse community, tree community, insect community Description of communities 1) Species content 2) Stability 3) Structure Lajoie –Communities ‘09 1) Species content 4 3 Abundance Species C Species B Species A Community Species richness - number of species Relative abundance - proportion of species Species diversity - richness and abundance 2 1 Richness Species C Species B Species A Community Lajoie –Communities ‘09 2) Stability We once thought: more species = more interaction = more energy pathways = more stability in perturbations But now: models predict ripple effects for long times simple communities return quickly to original Lajoie –Communities ‘09 3) Structure Organization is not random - habitat partitioning - clumped vs even vs random - individualistic or interactive See Fig 45.4 Lajoie –Communities ‘09 Individualistic vs Interactive A chance assemblage of species found in the same area because they happen to have similar abiotic requirements. An assemblage of closely linked species locked in by mandatory biotic interactions.
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