EVANTH 101D Lecture Notes - Lecture 9: Scramble Competition, Rh Blood Group System, Nepotism
27 Sep 2016
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Document Summary
Group living: 33% of mammals but 67% of primates, benefits: The dilution effect (selfish herd effect) - chance of being injured is less. Competition among group members for food resources (intragroup) Increased costs of movement - more exposure to different types of parasites and disease: factors that influence/determine primate group sizes: Larger groups favored bc decreased predation risk & intergroup feeding competition. Risk of male infanticide - will select for smaller groups. Other factors = birth/death: how it is organized: Social structure - the pattern of social interactions and the resulting relationships among members of a society . Social organization - the size, sexual composition and spatiotemporal cohesion of a society (solitary, pair bonded, polygyny, etc) Social system - a set of conspecific animals that interact regularly and more so with each other than with members of other such societies. Mating system - the organization of reproductive behavior of individuals in a population.
