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California sea lions, NMML archives

The California Current Ecosystems Program conducts research on the status and trends of marine mammals in Washington, Oregon, and California. The research projects focus on estimation of abundance and demographic parameters and the factors that regulate population growth such as disease and environmental changes.  Studies of movements, behavior and foraging ecology also provide insight into the role marine mammals play in the California Current Ecosystem as the populations recover from historical exploitation. 

Program Leader: Robert DeLong

Note:  The National Marine Mammal Laboratory (NMML) has recently changed its name to "Marine Mammal Laboratory" (MML). Please be aware that the former name still exists on lower-tier pages which have been retained for historical context.

Recent Reports, Publications, and Posters

Quarterly Reports Publications
  • MELIN, S. R., F. TRILLMICH, and D. AURIOLES-GAMBOA. 2017. California, Galapagos, and Japanese sea lions: Zalophus californianus, Z. wollebaeki, and Z. japonicas, p. 153-157. In B. Wursig, J. G. M. Thewissen, and K. M. Kovacs (editors), Encyclopedia of Marine Mammals. Academic Press, Oxford, England. https://doi.org/10.1016/B978-0-12-804327-1.00003-0  Online.
     
  • DeLONG, R. L., S. R. MELIN, J. L. LAAKE, P. MORRIS, A. J. ORR, and J. D. HARRIS. 2017. Age- and sex-specific survival of California sea lions (Zalophus californianus) at San Miguel Island, California. Mar. Mammal Sci. 33:1097-1125. https://doi.org/10.1111/mms.12427   Online.
     
  • ORR, A. J., J. D. HARRIS, K. A. HIRSCHBERGER, R. L. DELONG, G. S. SANDERS, and J. L. LAAKE. 2017. Qualitative and quantitative assessment of use of offshore oil and gas platforms by the California sea lion (Zalophus californianus). U.S. Dep. Commer., NOAA Tech. Memo. NMFS-AFSC-362, 72 p.   Online.
     
  • WRIGHT, B. E., R. F. BROWN, R. L. DeLONG, P. J. GEARIN, S. D. RIEMER, J. L. LAAKE, and J. J. SCORDINO. 2017. Survival rates of Steller sea lions from Oregon and California. J. Mammal. 98:885-894. https://doi.org/10.1093/jmammal/gyx033  Online.
     
  • BUHNERKEMPE, M. G., K. C. PRAGER, C. C. STRELIOFF, D. J. GREIG, J. L. LAAKE, S. R. MELIN, R. L. DeLONG, F. M. D. GULLAND, and J. O. LLOYD-SMITH. 2017. Detecting signals of chronic shedding to explain pathogen persistence: Leptospira interrogans in California sea lions. J. Anim. Ecol. 86(3):460-472. https://doi.org/10.1111/1365-2656.12656   Online.
     
  • SCORDINO, J. J., P. J. GEARIN, S. D. RIEMER, and E. M. IWAMOTO. 2016. River otter (Lontra canadensis) food habits in a Washington coast watershed: Implications for a threatened species. Northwest. Nat. 97(1):36-47  Online.
     
  • McHURON, E. A., S. H. PETERSON, J. T. ACKERMAN, S. R. MELIN, J. D. HARRIS, and D. P. COSTA. 2016. Effects of age, colony, and sex on mercury concentrations in California sea lions. Arch. Environ. Contam. Toxicol. 70(1):46-55. http://dx.doi.org/10.1007/s00244-015-0201-4  Online.
     
  • LYONS, E. T., T. A. KUZMINA, T. R. SPRAKER, S. R. MELIN, and R. L. DeLONG. 2016. Hookworms (Uncinaria lyonsi) in dead California sea lion (Zalophus Californianus) pups and sand in winter (2014-2015) on San Miguel Island, California. Comp. Parasitol. 83(2):283-286. http://dx.doi.org/10.1654/4824i.1  Online.
     
  • Additional recent California Current Ecosystems Program publications


Posters

  • Hunter Based Observations of Bowhead and Gray Whales Near Barrow, Alaska
    By:  J. CRAIG GEORGE, ROB DeLONG, BARB TUDOR, LEWIS BROWER, FREDRICK BROWER, BILLY OKPEAHA, BILLY ADAMS
    Conference:  Alaska Marine Science Symposium, Anchorage, AK, Jan 2013
    (2013 poster, .pdf, 3.4 MB)   Online.

     
  • Shark-inflicted Lesions on California Sea Lions (Zalophus californianus) at San Miguel Island, California: a New Phenomenon
    By:  JEFFREY D. HARRIS, SHARON R. MELIN, ROBERT L. DeLONG
    Conference:  California Cooperative Oceanic Fisheries Investigations (CalCOFI) Conference, La Jolla, CA, Dec 2011
    (2011 poster, .pdf, 1.13 MB)   Online.

     
  • Intraspecific Comparison of California Sea Lion (Zalophus californianus) Diet Assessed Using Fecal and Stable Isotope Analyses
    By:  ANTHONY J. ORR, GLENN R. VanBLARICOM, ROBERT L. DeLONG, VICTOR H. CRUZ-ESCALONA, SETH D. NEWSOME
    Conference:  Wildlife Society, Washington Chapter / Society for Northwestern Vertebrate Biology joint meeting, Gig Harbor, WA, Mar 2011
    (2011 poster, .pdf, 1.09 MB)   Online.

     
  • Examination of Ontogenetic Trends in Foraging Behaviors of California Sea Lions (Zalophus californianus) using Stable Isotope Analysis
    By:  ANTHONY J. ORR, SETH D. NEWSOME, JEFFREY L. LAAKE, GLENN R. VanBLARICOM, ROBERT L. DeLONG
    Conference:  Biology of Marine Mammals 18th Biennial Conf., Society for Marine Mammalogy, Quebec City, Canada, Oct 2009
    (2009 poster, .pdf, 1.06 MB)   Online.

     
  • Factors Influencing the Activity Budget of Territorial Male California Sea Lions
    By:  SARAH GUTZWILLER
    Conference:  Hollings Scholarship Student Presentations, Annual NOAA Science Symposium, Silver Spring, MD, Aug 2009
    (2009 poster, .pdf, 1.49 MB)   Online.

     
  • Program Distance: Recent Developments in Analysis and Design Capabilities for Cetacean Population Estimation
    By:  L. THOMAS, D. L. BORCHERS, S. T. BUCKLAND, J. L. LAAKE, E. REXSTAD
    Conference:  International Biometric Conference (24th), Dublin, Ireland, July 2008
    (2008 poster, .pdf, 985KB)   Online.

     
  • Double-Observer Line Transect Methods: Levels of Independence
    By:  STEPHEN T. BUCKLAND, JEFFREY L. LAAKE, DAVID L. BORCHERS
    Conference:  Biology of Marine Mammals 17th Biennial Conf., Society for Marine Mammalogy, Cape Town, South Africa, Nov/Dec 2007
    (2007 poster, .pdf, 1.03MB)   Online.

     
  • Examining the Ontogeny of Foraging Behaviors of the California Sea Lion (Zalophus californianus) Using Stable Isotope Analysis
    By:  ANTHONY J. ORR, SETH D. NEWSOME, GLENN R. VanBLARICOM, ROBERT L. DeLONG
    Conference:  Washington Cooperative Fish and Wildlife Research Unit Annual Cooperators Meeting, Seattle, WA, May 2006
    (2006 poster, .pdf, 3.09MB)   Online.

     
  • Additional recent California Current Ecosystems Program poster presentations



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