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14 Cards in this Set
- Front
- Back
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Metapopulation
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-group of interconnected, isolated populations
- concept expands populations in space - each sub-pop may or may not act an independent pop -potential to stabilize local pop if colonization rate>extinction rate |
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Classic metapopulation
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weak dispersal, rare
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Core-satellite metapopulation
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asymmetry, uncommon
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Patchy population
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strong dispersal, common
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source-sink populations
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common
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non-equilibrium metapopulation
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no dispersal, rare
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What can a classic metapop do about population?
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stabilize
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mechanism of stability
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dp/dt=mp(1-p)-xp
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p?
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proportion of occupied patches
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m
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rate of movement b/w patches
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x
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extinction rate of occupied patches
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At equilibrium:
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dp/dt=0=>p=1- (x/m)
equilibrium reached if x<m |
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Trophodynamics: top-down control
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Organisms higher in food chain/web control lower
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Pelagic marine food webs: trophic levels
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4 levels: piscivores, zooplankton feeders, zooplankton, phytoplakton
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