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Lecture

ANT331H5 Lecture Notes - Placentation, Gestation, Lactation


Department
Anthropology
Course Code
ANT331H5
Professor
..

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REPRODUCTIVE BEHAVIOUR February 4th, 2013
Male & Female strategies
Sex characteristics
John Hunter (1837)
Primary
Sex organs
Secondary
Ecological traits
Fighting (males)
Darwin (1871)
Primary
•Related directly to reproduction
Secondary
•Intrasexual competition
Intrasexual competition
1. Outmaneuver or drive away other members of the same sex
2. Attract members of the opposite sex
Male Competition
Tends to be more confrontational & intense than females
male fitness depends on maximizing mating frequency
May lead to earlier death than females
Gadgil & Bossert (1970)
Trivers (1972)
Model to explain earlier Male Mortality
Success of male reproductive effort
Dependent on the reproductive effort of male competitors
Success of female reproductive effort
Dependent on her own effort & less upon the effort expended by other females
Excessive Male Mortality
Cost of Male Reproductive Effort
Direct
Indirect
Ultimate Causes of Sex differences in mortality - Different reproductive strategies
Males greater competitiveness, means greater risks (especially in young males)
Selection for intense male mating effort leading to greater dissolution, death,
disease
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