EE BIOL 100 Lecture Notes - Lecture 7: Operational Sex Ratio, Nuptial Gift, Mating Call

• School: UCLA
• Department: Ecology and Evolutionary Biology
• Course: EE BIOL 100
• Professor: Gorlitsky, L.E.Lipman, A.J.

Document Summary

M live shorter life but reprod more lower survival chance but increase mate acquiring ability. Less parasites, sufficient food = developed brain/complexity of brain direct fitness = # of offspring produced = reprod rate x longevity parental investment. Time/energy/risk of parents to help offspring grow + reprod. F know they are mother, offspring has their genes so there is no benefit of copulating again after fertilization. Fewer sexually active f than m at any moment. If sex role reversal occurs during a breeding season, sexual tactics of f and m should change too: supply and demand. Su(cid:271)o(cid:396)di(cid:374)ates (cid:271)ef(cid:396)ie(cid:374)d f a(cid:374)d sho(cid:449) (cid:449)illi(cid:374)g(cid:374)ess to p(cid:396)ote(cid:272)t f"s offsp(cid:396)i(cid:374)g -> f will mate w/ him. Indivs have diff behaviors in bad situations (flexibility) Non dom indivs will gain competitive adv: poorly nourished beetle will produce larger testes instead of horn. Satellite males: crowd around paired couples, attach onto other males, exploit the mating call of another male.