#10 - Metapopulations

#10 - Metapopulations - Types of dispersal Metapopulations...

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1 Metapopulations Population substructure and the movement of individuals (and alleles) among subgroups Types of dispersal • Passive – No selection of direction or distance – No “searching” for a particular site – Some organisms have special mechanisms for involving other species in their dispersal • plants with sticky or spiny or fruit-enclosed seeds • parasites • freshwater clams (glochidia larvae live on fish briefly) • Active – Usually some kind of searching behavior Passive dispersal • What adaptations might be favored if you passively disperse your “propagules”? • How might passive dispersal affect your biology. ..life history? – spacing – growth form – genetics Dispersal of seeds with distance in six tree species (Fig. 6.2a)
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Patterns of dispersion Environments are “patchy” “Patchy” is in the eye of the beholder! • Fragmented • Interrupted (or discontinuous) • Heterogeneous • Mixed • Diverse • Broken up • How might these different ways of saying “patchy” mean different things ecologically? “Headwater” stream systems
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This note was uploaded on 04/24/2008 for the course BIOL 216 taught by Professor Baker during the Spring '08 term at Clark University.

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#10 - Metapopulations - Types of dispersal Metapopulations...

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