BIOL 121 Lecture Notes - Lecture 13: Natural Selection, Handicap Principle, Role Reversal
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Endurance rivalry- male"s reproductive success will be correlated with amount of time he spends copulating at mating site. Sperm competition- male"s reproductive success will be correlated with his sperm"s feature. Role reversal- not always female that invests more e. g. phalaropes (bird species), and ffffffffffffffffffffseahorses fffffffffffffffffffffemale is more attractive/ impressive. Female might choose not which one offers better nutrition, but which male will take better care of the young. Most species, females invest much more in their offspring than males. 2 important consequences: 1) females" reproductive success is limited by her ability to gain resources, Not ability to find a mate: 2) males" fitness limited by. # of females he mates with, not ability to acquire resources needed to e. g. nuptial gifts. Good genes/handicap hypothesis- phenotype is an indicator or advertisement for an indirect advantage. e. g. male"s guard, shelter & protect young indicator or advertisement for an indirect advantage. e. g. male"s guard, shelter & protect young e. g. architecture and location.
