{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Populations that move into a new environment will

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online