lecture 10TT_sexual_selection

lecture 10TT_sexual_selection - Sexual Selection: the...

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Sexual Selection: the problem. Why are there two morphs (forms), female and male. Don’t the same ecological challenges confront both sexes? food predators pathogens
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Sexual Selection: the problem. Why are there two morphs (forms), female and male. Why does one se have ecologically useless traits: handicaps? Why in almost every species is it the male who has these handicaps?
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Sexual Selection: defined. Selection for mating success. Natural Sel. Sexual Sel. survival mating fertility
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Sexual Selection Why are “handicaps” only evolved in one sex? Used in competition for mating. Why are matings not equally important to the fitness of males and females?
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copulation gestation birth lactation weaning rebuilding reserves for ovulation ovulation
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copulation gestation birth lactation weaning rebuilding reserves for ovulation ovulation copulation copulation…
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Sexual Selection Because of disproportionate female parental investment, females are in short supply Skewed operational sex ratio: at every moment there are more males ready to begin a reproductive venture than females. Male RS is more limited by access to mates than is female RS. Males forced to compete for matings.
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Mating Systems What measures reproductive success? Genes transmitted to the next generation. Males and females achieve this success in the context of particular mating systems.
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Four issues: A. Basic types B. How is reproductive success shared within each sex (evenly or unevenly)? C. Consequences for evolution
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This note was uploaded on 04/09/2012 for the course ANTH 7 taught by Professor Sell during the Fall '08 term at UCSB.

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lecture 10TT_sexual_selection - Sexual Selection: the...

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