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Hormones associated with friendship between adult male and lactating female olive baboons, Papio hamadryas anubis
Descriptive
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Title
Hormones associated with friendship between adult male and lactating female olive baboons, Papio hamadryas anubis
Name
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Shur
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Marc David
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Marc David Shur
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author
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Palombit
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Ryne A.
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Advisory Committee
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Ryne A Palombit
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chair
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Cronk
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Lee
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Advisory Committee
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Lee Cronk
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internal member
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Steklis
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Dieter
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Advisory Committee
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Dieter Steklis
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internal member
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Whitten
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Patricia L.
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Advisory Committee
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Patricia L. Whitten
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outside member
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Rutgers University
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degree grantor
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Graduate School - New Brunswick
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school
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theses
OriginInfo
DateCreated
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2008
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2008-05
Language
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English
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electronic
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application/pdf
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Extent
ix, 146 pages
Abstract
Adult male and lactating female olive baboons (Papio hamadryas anubis) form non-sexual attachments described by researchers as "friendships." Explanations for the evolutionary function of baboon friendship for males and females have been debated by many primatologists, but have yet to be determined conclusively. I tested hypotheses concerning the adaptive significance of friendship for each sex with analyses of fecal hormones. For males, I examined the association between testosterone and glucocorticoids, and friendship formation and maintenance. For lactating females, I investigated the association between glucocorticoid concentrations and friendship. Fecal samples and data on social behavior and spatial relations were collected from 26 adult male and 22 lactating female baboons in two study groups located in Laikipia, Kenya. Hormone concentrations were assessed by radioimmunoassay. Friendships were determined from composite proximity scores (C-scores) calculated for each male-female dyad in the groups. In male friends, profiles for testosterone, but not glucocorticoids, were consistent with a "paternal care" hormonal profile found in pair bonded primates and rodents. I argue that testosterone concentrations in male baboons suggest a hormonal mechanism underlying friendship and paternal solicitude similar to that in other mammals. The glucocorticoid profile of male friends led me to an alternative conclusion: periparturition and chronic elevation of glucocorticoids in male baboons during the lactation phase of their female friends functions to decrease testosterone and thereby divert male behavioral strategies from male-male competition and mating effort toward friendship with lactating females (and their infants). In lactating females, glucocorticoid levels were consistent with the hypothesis that male friends buffer lactating females from harassment induced stress. More particularly, my data suggest that lactating females are susceptible to stress from harassment by adult males rather than higher-ranking females, and that male friends may serve a protective function.
Note
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Ph.D.
Note
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Includes bibliographical references (p. 132-145).
Subject
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Topic
Anthropology
Subject
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Topic
Baboons--Behavior
Subject
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Topic
Social behavior in animals
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Graduate School - New Brunswick Electronic Theses and Dissertations
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rucore19991600001
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http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.17390
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ETD_897
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NjNbRU
Identifier
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doi:10.7282/T3DN45DB
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ETD doctoral
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Rights
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The author owns the copyright to this work.
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Copyright protected
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Open
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Name
Marc Shur
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Copyright holder
Affiliation
Rutgers University. Graduate School - New Brunswick
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Non-exclusive ETD license
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Author Agreement License
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I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
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