20-ch37-communitiesWES

20-ch37-communitiesWES - Chapter 37 Communities &...

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Chapter 37 Communities & Ecosystems
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Community includes all organisms inhabiting a particular area community – assemblage of populations of various species living close enough for potential interaction characterized by interspecific interactions , which can be. .. +/+ positive for both species; e.g., mutualism +/- positive for one, negative for another; e.g., predation, parasitism, disease -/- negative for both species; e.g., competition
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Competition may occur when a shared resource is limited interspecific competition – when different species compete for a resource (sunlight, water, food, space) competitive exclusion principle – two species cannot share the same ecological niche; one will drive the other to local extinction
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crown supergiant A. baleatus Meet the family: Anolis lizard “ecomorphs” ground-rock A. ophiole twig dwarf A. angusticeps trunk-crown giant A. chlorocyanus trunk-ground A. allogus (Williams 1983) How do so many closely related, ecologically similar species coexist in the same forest? consider differences in microhabitat
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Resource partitioning allows similar species to coexist resource partitioning – differentiation of niches that allows differen species to coexist; ghost of competition past
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predation +/- interaction in which one species (predator) kills & eats another (prey) predators are not always animals; consider some fungi prey are not always animals; consider (killed) seeds
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This note was uploaded on 06/18/2011 for the course BIOL 1334 taught by Professor Staff during the Spring '08 term at UT Arlington.

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20-ch37-communitiesWES - Chapter 37 Communities &...

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