Within Group Competition Among Female Primates<br />
3. Competition sometimes favors cooperation among females<br />Within group competition<br />females form alliances in som...
In wild baboons, food availability limits female fitness (Amboseli)<br />
High ranking female olive baboons eat more each day<br />30% difference in food intake between highest and lowest ranking ...
In captive olive baboons, rank affects interbirth intervals<br />60% shorter than wild baboons<br />145 days of lactationa...
Social bonds enhance reproductive success of female baboons	 + independently of high rank & ecological conditions<br />Fro...
From Pusey et al 1997<br />Even though chimp females spend much time alone, rank affects fitness<br />
Callitrichid females both compete and cooperate<br />Live in small family groups<br />Dominant female produces offspring<b...
Callitrichid females both compete and cooperate<br />Dominant females may kill subordinate female’s infants<br />High rank...
Cooperation: In marmosets and tamarins, female RS depends on helpers<br />
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Female cooperation slide show

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Shows data related to female reproductive success in within group competition.

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Female cooperation slide show

  1. 1. Within Group Competition Among Female Primates<br />
  2. 2. 3. Competition sometimes favors cooperation among females<br />Within group competition<br />females form alliances in some species<br />affect access to resources<br />affect rank acquisition<br />Alliances often composed of kin <br />Social bonds (friends) may also enhance reproductive success<br />Not about rank<br />Not about fighting for resources<br />
  3. 3. In wild baboons, food availability limits female fitness (Amboseli)<br />
  4. 4. High ranking female olive baboons eat more each day<br />30% difference in food intake between highest and lowest ranking females<br />Modified from Barton & Whiten 1993<br />
  5. 5. In captive olive baboons, rank affects interbirth intervals<br />60% shorter than wild baboons<br />145 days of lactational amenorrhea vs. 360 - 405 days in wild<br />Better nutrition<br />Little energy spent on travel<br />High ranking females shorter:<br />lactational amenorrhea<br />Fewer cycles before conception<br />Low ranking females shorter:<br />Gestation length<br />Lighter moms & lighter infants:<br />Longer lactational amenorrhea<br />More cycles before conception<br />wild<br />Garcia et al. 2005<br />
  6. 6. Social bonds enhance reproductive success of female baboons + independently of high rank & ecological conditions<br />From Silk et al. 2003<br />
  7. 7. From Pusey et al 1997<br />Even though chimp females spend much time alone, rank affects fitness<br />
  8. 8. Callitrichid females both compete and cooperate<br />Live in small family groups<br />Dominant female produces offspring<br />Other group members help care for offspring<br />Fathers/mating males help most<br />Subordinate females don’t breed<br />Golden lion tamarin<br />
  9. 9. Callitrichid females both compete and cooperate<br />Dominant females may kill subordinate female’s infants<br />High rank affects competition<br />Dominant females also rely on help from subordinate females<br />Carry infants<br />Watch for predators<br />Help defend territory against other troops<br />Dominant females must also cooperate with subordinates<br />Give more grooming than they receive<br />Not tightly connected with care or support from subordinate females<br />Who benefits? Who benefits the most?<br />Pygmy marmoset<br />
  10. 10. Cooperation: In marmosets and tamarins, female RS depends on helpers<br />

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