BIOB51H3 Lecture 23: Lecture 23 & 24
19 Apr 2016
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Lecture 23-24: evolution of aging & life history. Variation in aging patterns: ie) blue footed boobies. Life history theory: branch of evolutionary biology devoted to explaining variation in reproductive strategies: ie) variation in: (all these traits affect fitness) age of sexual maturity. Why are there so many different reproductive strategies: longevity. Bats: survive ~30 yrs; yearly reproduction once mature. Brown antechinus: one breeding season, then dies: # of reproductive bouts, longevity. California poppy: flower in one season then die: offspring size & # of reproductive bouts. ): are about 6 lbs, produce 1lb eggs and have 2 eggs/ clutch. Redback spider: 300 spiderlings/clutch, one clutch every 2 weeks: time to sexual maturity, longevity. Thrips egg mite: sexually mature before hatching, dies @ 4 days old. Elephants: 11-23 years old before maturity, live to ~65 years. Evolution by natural selection leads to traits that increase lifetime reproductive success relative to conspecifics: a perfect" evolutionary organism would:
