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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
Washington: 13 species (2 predators ~15%)
45 species (11 predators ~ 24%) Source: Paine 1966, 1971 What stabilizes communities?
Hypothesis: Strong top-down interactions stabilize
Predators keep prey
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.
- Fall '12