WFC 151 Lecture Notes - Lecture 8: Habitat Fragmentation, Biological Specificity, California Mouse
15 Oct 2016
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Cost of dispersal: predation, starvation, no suitable habitat (wander forever then starve to death) Competition for resources: good habitat, density is high. Dispersal may provide new habitat that is more suitable or higher quality. Competition for mates: juvenile male born here have to compete with a dominant male for mates. Inbreeding: juvenile female face mating with relatives: inbreeding depression: low fitness when mate with close relatives. Evolution of dispersal: a genetic basis in which natural selection favors the ability to assess prospects for success use cues. That"s why animals do exploratory excursions (looking nearby area) common assessment exercise. All males disperse when reach adulthood (1 year old). Can"t do research on them since no data for philopatric male (no one stays: cost of female dispersal = 16, philopatry: cost of inbreeding = 10% (breed with relatives, philopatry: cost of loss reproduction = 20% (can"t breed) Considering the cost, dispersal is more beneficial.
