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anthro 128 week 5 - C hapter 8(43 When males migrate into a...

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Chapter 8: (43) When males migrate into a particular group, many pregnant females become visibly stressed as they try to negotiate relationships with all of the new, hot-blooded males who keep bursting into their lives. In addition to this, juveniles need to make hard decisions about whether to stay with their mother or their play partners; many individuals spend long days and nights completely alone while they search for the group they want to join. By the end of a given month most of the young males from a particular group leave to form their own all-male groups (44) According to Sarah Hrdy’s theory of sexual selected infanticide, males who migrate into new groups kill the infants so that the females will come into estrus sooner, and then they will mate with them. In terms of capuchins (specifically Abby’s group), the rate of infanticide was great in a period of time due to the large amount of migrating males and constant change in the alpha male position. The alpha male’s tenure in a given capuchin group was relatively short in comparison to the amount of time needed for conceptual weaning and thus infanticide was more likely to occur. (45) Male migrations usually lead to a change in alpha male position. A change in alpha male position usually meant that the rate of infanticide in Abby’s group increased. Whenever an infanticide occurred, the females usually formed coalitions against a given male and sought to drive him out of the group. In one case, Diablita distanced herself from the males in her group so well that she became difficult for the team of researchers to find; Diablita was upset and feared for the life of her infant after the infant Vodka was killed. In some cases migrations and infanticides strengthened male-female relations in a particular group. When females realize how devastating male migrations can be to a group, they will often become great supporters of their current alpha male so that he can offer assistance in fending off intruder males from other groups. Chapter 9: (46) During capuchin group encounters males generally gather information about each other. This information will be stored away for future use, when they may need to decide whether to ally themselves with a certain male and co migrate or fight with him. Only male capuchins participate in intergroup encounters; female capuchins grab their infants and
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run in the opposite direction. Most males participate in intergroup encounters because they are defending their access to females. By fighting against the other group’s males not
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