BIO120H1 Lecture Notes - Lecture 22: Insular Biogeography, Metapopulation, Patch Dynamics
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Metapopulations: populations of populations : metapopulations of tiger salamanders in different pools per metapopulation, dispersal connects these metapopulations, spatially distinct populations in metapopulations = patch. Metapopulation structure can allow population persistence even when individual populations are doomed: local populations can be re-established by colonists, source-sink dynamics, migrants rescue this population, metapopulation is not doomed if one patch goes extinct. Instead of thinking number of individuals, we think about patches. Ignore many things that make it realistic: assume large number of patches. If they can"t move from region to region: north = stable, middle, no occupancy, south = some occupancy. High patch turnover: 114 patch extinctions and 109 re-colonizations between 1989 and 2010: pika population goes through extinction renewal process, frequently recolonization. Tendency of driven extinctions which occur at non-equilibrial conditions, and it countered by habitat patchiness, rescue by migration, variation in life history strategy.
