GenBio3SexSel

GenBio3SexSel - Sexual Selection 1 Sexual Selection...

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Sexual Selection 1
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Sexual Selection 2 Differential Investment in Reproduction Females generally make greater investment Males Females No. of offspring No. of matings fixed vast Ergo: females choose ; males compete Male fitness increases with # of matings So.… males are relatively indiscriminate Female fitness does not increase with # of matings So….females are selective (choosy)
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Sexual Selection 3 Rare Exception: females compete, males choose Sex Role Reversal Mating Strategies 2. Intrasexual Selection among members of one sex (i.e., male-male competition) 1. Intersexual Selection one sex chooses a mate (i.e., female choice) 1. Intersexual selection : Requirements Benefits Consequences
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Sexual Selection 4 Female Choice requires: Genetic variation in male trait males with larger repertories attract more mates Acrocephalus warbler
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Sexual Selection 5 Benefits of Female Choice: Direct Benefits - male provides resource(s) that enhance survival or fecundity Indirect Benefits - male more fit, so offspring more fit (Good Genes Hypothesis) Scorpion fly Direct e.g. food (nuptial gift) If nuptial gift too small: female leaves before inseminated Female choice in absence of male investment Good Genes Hypothesis Indirect
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GenBio3SexSel - Sexual Selection 1 Sexual Selection...

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