describe the four types of mating systems
Monogamy: limited mating opportunities, male investment in offspring is high, male confidence in paternity is high, little sexual dimorphism, territoriality
Why: Ecology and parental care
Polygyny: clumped resources, females congregate, high variance in male RS, female receptive one at a time
Why: possible for one male to defend access to multiple females
Promiscuity: multiple males and females, females mate multiple, in chimps multiple males must defend a territory, males with highest fitness can mate multiply and often leads to scramble competition
o Why: females benefit from mating multiply, males do not succeed in monopolizing access
Polyandry: When one female has multiple males. Rare in mammals in general but occurs in tamarins and marmosets, occurs in humans as well (poor conditions where multiple male investment is crucial), Generally the males are related. Example of humans is in the Himalayas.