BIO120H1 Lecture Notes - Lecture 22: Metapopulation, Inbreeding Depression, Island
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Individuals can move from one population to another, they can disperse. Dispersal allows organisms to colonize her areas, escape competition, avoid inbreeding depression. Many taxa have evolved traits that aid in dispersal. Dispersal is important for colonization of new habitats. E. g. postglacial colonization depends on plant and animal dispersal, range shifts in response to climate change, islands (form through volcanic activity, gets colonized) Metapopulation: collection of spatially distinct populations that are connected via dispersal. Each spatially distinct population is a patch. Metapopulation structure can allow population persistence even when individuals populations are doomed. Local populations can be re-established by colonists from other populations after going extinct. Sinks: populations in small population patches that would go extinct except migrants from source populations rescue these populations. # prey > # predators (which is 0) # prey >> # predators (which is 0) # prey > # predators (no longer zero) # predators >> # prey (which is 0)
