BIOL2060 - Lecture 32 - Nov 28, 2013

BIOL2060 Lecture 32

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Unformatted text preview: s. Would you describe this forest community as being stable? A.  Yes, the community is stable if we define stability in terms of resilience B.  No, the community is not stable if we define stability in terms of resistance 6 3 What stabilizes communities? Observation: Communities with more predators have higher species richness Ocean zooplankton communities: Atlantic shelf: 81 total species (16% predators) Sargasso sea: 268 total species (39% predators) Sargasso sea is to the east of US main continent Intertidal communities: Washington: 13 species (2 predators ~15%) California: 45 species (11 predators ~ 24%) Source: Paine 1966, 1971 What stabilizes communities? Hypothesis: Strong top-down interactions stabilize communities Predators keep prey populations below carrying capacity Prevent competitive exclusion, by allowing the coexistence of many more species More coexistance = higher species diversity “un fait accomp...
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This document was uploaded on 03/10/2014 for the course BIOL 2060 at University of Guelph.

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