11:216:269 Lecture Notes - Lecture 9: Dendrology, Fossorial, Philopatry
19 Sep 2018
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Natal philosophy the young will disperse from their natal site. Males tends to disperse less distance than that. California: 45% animals disperse (females always dispose more) Utah: 70% animals disperse (females always disperse more) If one sex cohabits with the opposite sex for the rst six years of life, they become unable to mate: reproductive suppression - adult breeders suppress reproduction of young. Increased density dependent competition - natal site becomes more crowded and thus there are fewer resources to go around for each individual: philopatry increases competition for food and space. Bene ts of philopatry: animals are already adapted to the local conditions, risk of predatory decreased, energy expenditure decreased. Overall costs are greater than bene ts for most animals > most animals disperse. Crickets - 2 morphs (same genotype, di erent phenotype) Dispersers have large wings, large thoracic muscles. Non-dispersers produce eggs quicker and 2x the amount of eggs than dispersers.
