Lect. 08 social-kin selection web

Lect. 08 social-kin selection web - Cooperative feeding...

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Social aspects of Ecology Behavioral Ecology : Study of actions and reactions of organisms to environment. Sociobiology : Study of interactions between members of same population. Fitness : What is this again? Number of offspring (genes) contributed to future generations.
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Fitness for most species requires mating What is male and female ? Females produce larger, more energetically costly gametes. Males produce smaller, less costly gametes. Female reproduction limited by resources. Male reproduction limited by mates.
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Mating is a Social Interaction with evolutionary consequences… Sexual Selection Increased fitness due to mating success. Intrasexual Selection : Rivals compete for access to mates. Intersexual Selection : Mate choice based on particular trait. Traits that promote mating success get passed on! Are they adaptive?????
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Sociality = cooperation among individuals Exchange resources or provide assistance.
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Unformatted text preview: Cooperative feeding Defense of the social group. Restricted reproductive opportunities. Eusociality = most complex level of sociality Three major characteristics: More than one generation lives together. Cooperative care of young. Non-reproductive and reproductive castes. Cast systems in ants and naked mole rats (oh my.!?.) Why cooperate? Kin Selection and African Lions Prides = 3-6 adult females (usually) All are close relatives. Explained by kin selection. Prides also contain coalitions of 2 to 9 males However, not always related.hmmm? Male Lion Coalitions Single males have no chance of mating (claiming pride). So, males MUST form coalitions. Probability of siring depends on rank. Chance of reproductive success lowered w/ more males. Coalitions of non-relatives always small (2-3)....
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This note was uploaded on 01/13/2012 for the course BIO 8 taught by Professor Prestongalusky during the Fall '11 term at Riverside Community College.

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Lect. 08 social-kin selection web - Cooperative feeding...

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