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Behavioral endocrinology of wild male siamangs (Symphalangus syndactylus)
Descriptive
TitleInfo
Title
Behavioral endocrinology of wild male siamangs (Symphalangus syndactylus)
Name
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NamePart
(type = family)
Morino
NamePart
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Luca
NamePart
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1974-
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Luca Morino
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author
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Ryne
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Ryne Palombit
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Advisory Committee
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chair
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Vogel
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Erin
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Erin Vogel
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Advisory Committee
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internal member
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Trivers
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Robert
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Robert Trivers
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Advisory Committee
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internal member
Name
(type = personal)
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(type = family)
Cachel
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(type = given)
Susan
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Susan Cachel
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Advisory Committee
Role
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internal member
Name
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(type = family)
Katz
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Larry
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Larry Katz
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Advisory Committee
Role
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outside member
Name
(type = personal)
NamePart
(type = family)
Lappan
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(type = given)
Susan
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Susan Lappan
Affiliation
Advisory Committee
Role
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(authority = RULIB)
outside member
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Rutgers University
Role
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(authority = RULIB)
degree grantor
Name
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Graduate School - New Brunswick
Role
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school
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Text
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theses
OriginInfo
DateCreated
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2012
DateOther
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(type = degree)
2012-10
Place
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xx
Language
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(authority = ISO639-2b);
(type = code)
eng
Abstract
(type = abstract)
The goal of my dissertation is to clarify the evolutionary forces shaping the behavioral and hormonal profiles of male primates. I collected more than 4,000 hours of focal behavioral observation and over 700 hormonal samples on five monogamous and six polyandrous groups of wild siamangs (Hylobatidae: Symphalangus syndactylus) in Sumatra (Indonesia), between August 2007 and May 2009. I addressed three basic aspects of gibbon sociality: 1. The monogamous social system of gibbons is thought to be maintained by intense male-male intolerance, yet in many populations there are numerous polyandrous groups. I test the hypothesis that dominance relationships regulate the interactions of adult male siamangs. Dominant males could clearly be identified in each group, based on a consistent direction of agonistic interactions, displacements and positional behavior. These males enjoyed greater social access to the resident female and monopolized copulations. 2. I tested the Challenge Hypothesis, which posits a correlation between male androgen levels, male-male aggression, and paternal effort. Results showed no association between male testosterone and group composition, male rank, or rate of intergroup aggression. Androgen concentrations were positively correlated with rate of intragroup aggression. Males involved in a period of social instability (an aggressive group takeover) had T concentrations twice above average. Males displaying active parental care had significantly lower testosterone concentrations than control males. These results represent a particularly valuable test of the Challenge Hypothesis due to the rarity of monogamous/polyandrous mammal species with paternal care. 3. An analysis of the aggressive takeover of three siamang groups suggests that: 1) variation in this species’ characteristic duetting is associated with periods of social instability; 2) takeovers represent a threat to vulnerable infants and forced weaning is used as an anti-infanticide tactic; 3) female ‘preferential’ social behavior toward one of the contenders influences the outcome of a takeover; 4) a secondary adult male in the group reduces the risk of being evicted for the dominant male. This research adds important pieces to our understanding of gibbon social organization, can help assess the generality of some human patterns (such as mate guarding, paternal care), and has important contributions to conservation efforts.
Subject
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Topic
Anthropology
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Title
Rutgers University Electronic Theses and Dissertations
Identifier
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ETD_4236
PhysicalDescription
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electronic resource
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application/pdf
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Extent
x, 104 p. : ill.
Note
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Ph.D.
Note
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Includes bibliographical references
Note
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by Luca Morino
Subject
(authority = ETD-LCSH)
Topic
Siamang--Behavior--Endocrine aspects
Subject
(authority = ETD-LCSH)
Topic
Siamang--Research
Subject
(authority = ETD-LCSH)
Topic
Inter-male aggression
Identifier
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http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000066920
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Title
Graduate School - New Brunswick Electronic Theses and Dissertations
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rucore19991600001
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NjNbRU
Identifier
(type = doi)
doi:10.7282/T3T152D0
Genre
(authority = ExL-Esploro)
ETD doctoral
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Rights
RightsDeclaration
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The author owns the copyright to this work.
RightsHolder
(type = personal)
Name
FamilyName
Morino
GivenName
Luca
Role
Copyright Holder
RightsEvent
Type
Permission or license
DateTime
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(point = start)
2012-09-13 09:52:36
AssociatedEntity
Name
Luca Morino
Role
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Affiliation
Rutgers University. Graduate School - New Brunswick
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Type
License
Name
Author Agreement License
Detail
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.
RightsEvent
DateTime
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2012-10-31
DateTime
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2013-10-31
Type
Embargo
Detail
Access to this PDF has been restricted at the author's request. It will be publicly available after October 31st, 2013.
Copyright
Status
Copyright protected
Availability
Status
Open
Reason
Permission or license
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