The Ecology of Populations (II)

The Ecology of Populations (II) - The Ecology of...

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6/4/11 The Ecology of Populations I) Distribution and spatial structure 6 II) Growth and Regulation 6 III) Dynamics
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6/4/11 Small populations Catastrophe (disease, fire…) 6 Random environmental variation 6 Demographic stochastictity
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6/4/11 Metapopulations (I) ‘A set of discrete subpopulations connected by occasional movement of individuals between them’ Ricklefs. 6 The independence of subpopulations obviously depends on the amount of dispersal among them
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6/4/11 Metapopulations (II) Low migration rate Remember that small populations are vulnerable to extinction. Without recolonization of empty patches (following local extinction of subpopulation), the whole population may become extinct. Tim e
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6/4/11 Metapopulations (II): migration Intermediate migration rate Unoccupied patches are recolonized following local extinction. The metapopulation persists. They twinkle on and off like holiday lights. Tim e
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6/4/11 Metapopulations (II): migration The subpopulations act as a single large population, so are less likely to suffer extinction. It’s questionable whether this qualifies as a ‘metapopulation’. Tim e
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6/4/11 Metapopulations (III): effects of patch size and isolation Islands in a meta-population of the shrew Sorex araneus on islands in two lakes in Finland Hanski (1991) Biol. J. Linn. Soc.
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6/4/11 Metapopulations (III): Thomas and Jones (1993), Journal of Animal Ecology
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DISCUSSION Gilbert et al. 1998 6 What hypothesis did they test? 6
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This note was uploaded on 06/04/2011 for the course PCB 4043 taught by Professor Osenberg during the Fall '10 term at University of Florida.

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The Ecology of Populations (II) - The Ecology of...

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