11:216:115 Lecture Notes - Lecture 6: Philopatry, Incest Taboo, Inbreeding Depression
25 Nov 2013
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9:27 am: ultimate causes of x --> y, most dispersal is of young males, like lions and elephants, natal dispersion is opposite of natal philopatry, costs of philopatry. Inbreeding: increases risk of progeny homozygous for recessive alleles, incest taboo, e. g. In an experiment, when voles are placed with siblings, they leave earlier and disperse farther. In another experiment, when placed in a group of non-relatives, leave later and don t disperse far: e. g. Increased predation risk: fossorial species are small animals that live underground, to disperse, they come aboveground and there are hawks and owls in their paths, harsh weather, most dispersion occurs in the spring, and so bad weather. Proximate mechanism of x --> y: natal dispersion, comparison search: visits several areas, revisiting some, then choosing best. Sequential search: do not revisit previously visited: longer distances in straight lines, short distance.
