RelativeResourceManager3

RelativeResourceManager3 - Mechanisms of coexistence and...

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1 Mechanisms of coexistence and life-history trade-offs Tuesday 25 October 2011 - BIOL308 Readings: 21.9-10,13; 22; 32.1-2,11 Plan n The competitive exclusion principle (L-V model) allows coexistence when: q Small resource use overlap q Resources consumption and renewal are considered (Tilman’s model): stable coexistence if species consume more of the resource that more limits their growth n Mechanisms of coexistence: Life-history tradeoffs q Competition-colonization tradeoff q Variability in the availability of resources (r-K selection, MacArthur and Wilson 1967) q Biotic (consumers) and abiotic (physical) disturbance of good competitors
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2 Mechanisms of Coexistence n Variability in resource availability q Variability in resources/conditions (space or time) & q Species differentiation such that every species must be the best competitor on some spatial or temporal scale. n Life-history trade-offs q There is no super organism à life-history trade- offs q There are costs and benefits to adaptations Ricklefs 32.1-2 Competition in metapopulations: competition-colonization tradeoff n Consider the case where 2 species are competing for the same resource in local populations (patches) n The exclusion principle predicts that the superior competitor would exclude the inferior competitor in each patch n Should dispersal limitation change the outcome of competition? Ricklefs 21.13
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3 Competition with dispersal limitation n Metapopulation model for 1 species can be expanded to 2 competing species: a patch can be empty, occupied by
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RelativeResourceManager3 - Mechanisms of coexistence and...

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