Biology 1001A Lecture Notes - Lecture 15: Facial Symmetry, Anisogamy, Parental Investment
30 Apr 2012
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Intersexual selection: female choice, a trait is considered attractive in a male. Why: males are competing for access to females. Selective forces on males vs. females: average fitness of males is equal to the average fitness of a female, males have a higher potential fitness (moulay isamael - 888 children) than females (mrs. Vassilyev - 69 children: male potential fitness is determined by how many mating opportunities they can find, females tend to be limited by access to resources (eggs, different selective forces acting on males and females. In phalaropes, females lay the egg, but the male is the one who takes care of the baby phalaropes, thus females fight for the access to males. In seahorses, the male cares for the offspring, thus females are subjected to stronger sexual selection than males. If both sexes invest heavily in offspring: both males and females compete long term mating. In a short term mating encounter, females are more selective.
