09 sperm comp & RS

09 sperm comp & RS - Sperm Competition Reproductive...

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Sperm Competition *  testes size *  copulatory plug *  effects of repeated ejaculation *  mating order *  seasonality Morphological & physiological considerations:
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Relative Testes Size
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Sperm Competition Polyandrous
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Evolution of Semenogelin Semenogelin (protein that forms coagulum) evolves faster if F mate multiply; Post-copulatory sperm  competition drives evolution of semenogelin  Ratio of  nonsynonymous to  synonymous  mutations  (>1: Darwinian; <1:  purifying;    =1:  neutral)
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Behavioral Strategies decreases likelihood of mating rank-related strategy increases likelihood of mating Incest avoidance decreases likelihood of mating differential social influences on mating
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Reproductive Success
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Fertility Constraints Female considerations  (e.g. human): *  delayed sexual maturity menstrual cycle (e.g. 1 ovum / fertile mo) *  short fertilizable life of ovum (<12-36 hrs) *  concealed (cryptic) ovulation *  long pregnancy *  lactation amenorrhea (=> long IBI) *  menopause (reproductive senescence) *  birth of infant 3-6 yr  cycle
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Breeding Potential Male considerations  (e.g. human):  *  multiple ejaculations/day
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09 sperm comp &amp; RS - Sperm Competition Reproductive...

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