Populations that move into a new environment will

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Unformatted text preview: l host, under monogamy (no sexual selection) or polygamy (sexual selection). Populations that move into a new environment will adapt by natural selection Pat Lorch If females discriminate against maladapted males (bad genes), then sexual and natural selection will be aligned: Sexual Selection • Sexual selection will accelerate adaptation • Rapid development is favoured in novel host. Claudia Fricke After 35 generations of adaptation: • beetles adapt to novel host (fitness up) Polygamy is b etter in NEW h ost Populations with sexual selection will evolve to higher fitness than those without • adaptation is accelerated with SS Natural Selection Development rate data Monogamy is b etter in OLD h ost -Under the "Good Gene Hypothesis": Natural and sexual s election are working together in the same direction -Both forces working together will bring about adaptation f aster! Just how harmonious are male/female interactions? Sexual Conflict -Waterslider and an unnecessary p icture of its penis that Prof Rowe f orced us to look at (above) - Harem ( recall what this is) Costs of mating Most females mate multiply and it is superfluous wrt gaining sperm Costs include: • time, and energy • STI’s • increased risk of predation • • injury death -Males seek to increase t heir mating frequency -Females bare most of the c osts and seek to reduce m ating frequency -This is the source of much c onflict bet ween the t wo s exes Costs of ejaculate transfer Ejaculates are often only a few percent sperm, the rest is a cocktail of proteins and peptides (100+ in flies) These molecules can be detected in the bloodstream (even in humans!) shortly after mating. They have large effects on gene regulation, reproduction, behaviour etc. Potential costs include: • changes in reproductive allocation • reduced remating • reduced lifetime fecundity (sex peptide) -All of these above things serve to benefit males, they are n ot good for females -Females will experience reduced re-mating: they will not m ate with other males, this reduces sperm competition 3 2/13/2013 -Males and females have different expectations Divergent...
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This document was uploaded on 01/27/2014.

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