BIOLOGY 1M03 Lecture Notes - Lecture 1: Brain Size, Shared Parenting, Savanna
11 Dec 2015
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Direct fitness + indirect fitness = inclusive fitness (indirect = through non-descendent young) Some critics claim that evolution does not explain human kindness. Providing help for an unrelated friend (not your kin) If the fitness benefit to the recipient>the fitness cost to the donor, both participants will gain if the help is reciprocated at a later date. Cannot survive >3 days without feeding will stave to death. Regurgitate to kin and non-kin regurgitate to them. It works because benefit>cost: benefit to recipient of 5% body weight (+30 hours to live)>cost to donor of 5% body weight (-5 hours to live) Referential alarm calling: one call for terrestrial predators (ahnee, separate call for aerial predators (chlurp) Alarm call then dive into trees to avoid predator. Increase in average cranial capacity: 2 major increases. Complex foraging: 1st brain size increase corresponds to increased meat consumption high quality food. Greatest decrease in tooth size in human evolution.
