Skip to main content
WCS
Menu
Library
Library Catalog
eJournals & eBooks
WCS Research
Archives
Research Use
Finding Aids
Digital Collections
WCS History
WCS Research
Research Publications
Science Data
Services for WCS Researchers
Archives Shop
Bronx Zoo
Department of Tropical Research
Browse By Product
About Us
FAQs
Intern or Volunteer
Staff
Donate
Search WCS.org
Search
search
Popular Search Terms
WCS History
Library and Archives
Library and Archives Menu
Library
Archives
WCS Research
Archives Shop
About Us
Donate
en
fr
Title
Determinants of outcomes of agonistic interactions among male California sea lions (Zalophus californianus)
Author(s)
Jacobs D.F., Hernandez-Camacho C.J., Young J.K., Gerber L.R.
Published
2008
Publisher
Journal of Mammalogy
Published Version DOI
https://doi.org/10.1644/07-MAMM-A-171.1
Abstract
Agonistic behavior in territorial male California sea lions (Zalophus californianus) may be influenced by multiple factors, including who initiates an interaction and who owns the territory on which an encounter takes place. We studied predictors of the outcomes of agonistic interactions between territorial male California sea lions on 3 islands (Los Islotes, Granito, and San Jorge) in the Gulf of California, Mexico, during the 2005 breeding season. We evaluated both displays and fights among males to examine the hypotheses that initiators of agonistic interactions and that territory owners were more likely to win disputes. The outcomes of agonistic encounters (win or lose) were independent of the types of interaction (displays or fights) by the initiator and, hence, all agonistic interactions were pooled for analyses. We used an overdispersed binomial logistic regression to determine if initiators and resident males were more likely to win an interaction than noninitiators and nonresidents, respectively. We found that initiators of agonistic interactions were more likely to win agonistic disputes. Resident and nonresident males were equally likely to initiate agonistic interactions and were also equally likely to win agonistic disputes. Our results suggest that agonistic interactions among male California sea lions are influenced by which individual initiates the encounter and not by territory ownership. © 2008 American Society of Mammalogists.
Keywords
agonistic behavior; display behavior; island; logistics; male behavior; pinniped; territoriality; Gulf of California; Mexico [North America]; North America; Pacific Ocean; Pinnipedia; Zalophus; Zalophus californianus
Access Full Text
A full-text copy of this article may be available. Please email the
WCS Library
to request.
Back
PUB11970