Biology 1002B Lecture Notes - Lecture 17: Spermatophore, Convergent Evolution, Parental Investment
9 Apr 2016
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Explains sexual dimorphism: differences in male and females behaviour, phylogeny, males must be extravagant, females are choosey. Explains traits that reduce survival: traits that attract mates, but also predators, ex. Frog"s give out sexy calls to females, but this attracts bats (predators) but it"s favoured, they continue to do it anyway. Intra: among males: convergent evolution of horns, weapons, big body size. Inter: males impress females: colourful, singing, displays for the female. Blurry distinction: bower birds; decorate their nests (preferably blue) to attract females (inter), but if a male leaves his bower for any reason another male may try to destroy his competitions bower (intra) Because females have a set amount of offspring she can produce, males can produce an unlimited amount of offspring so long as they can find a mate: can"t focus on quantity, so they focus on quality. Males can provide direct benefits: bring her food, provide shelter, protect against predators, ex.
