BIOL 1030 Lecture Notes - Lecture 28: Spotted Owl, Metapopulation
19 Apr 2018
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Document Summary
Metapopulation: a system of interconnected population, with no connection - each population eventually goes extinct, connected populations - can recolonize after local extinctions, whole system of pops can last much longer. In butterflies only, some of the available patches have been colonized: some pops go (locally) extinct, eventually recolonized from other pops, california spotted owl . Patches of suitable habitat scattered through s. california. Small scale: repeated disturbance, may never reach equilibrium, small isolated reserves will be relatively ineffective in preventing extinction. Large scale: mosaic of patches, a large scale balance, to some degree, the whole landscape needs to be maintained. Example: the large-scale fire in yellowstone national park. In 1988 demonstrated that communities can often respond very rapidly to a massive disturbance. Demographic stochasticity: with random variation around r, the population could remain somewhat stable, or could decline quite dramatically. If isolated, no new individuals arrive to revive the population.
