ANT E101 Lecture Notes - Lecture 19: Canine Tooth, Sperm Competition
Document Summary
Darwin: differences in reproductive success caused by competition over mates sexual selection. Intersexual selection: where individuals exert choice among individuals of the opposite sex for mating partners favors traits that make males usually more attractive to females. Intrasexual selection: competition among same-sex individuals for access to members of the opposite sex favors large body size, large canine teeth, and other traits that enhance competitive ability. Context competition for mates traits that improve fighting success. Selection for large male size body size sexual dimorphism. Selection for large male canine size canine dimorphism. When males and females differ consistently in size or appearance. Greatest in one-male, multifemale (polygynous) social groups. In social systems where multiple males have access and male-male competition is high, sexual selection favors sperm competition. Sexual selection hypothesis: infanticide is a male reproductive tactic, which is sexually-selected (ie as a consequence of male-male competition)
