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
Recent Reports, Publications, and Posters
- LYONS, E. T., T. R. SPRAKER, R. L. DeLONG, M. IONITA, S. R. MELIN, S. A. NADLER, and S. C. TOLLIVER.
2011. Review of research on hookworms (Uncinaria lucasi stiles, 1901) in northern fur seals (Callorhinus ursinus Linnaeus, 1758). Parasitol. Res. 109(2):257-265.
- LYONS, E. T., R. L. DeLONG, S. A. NADLER, J. L. LAAKE, A. J. ORR, B. L. DeLONG, and C. PAGAN.
2011. Investigations of peritoneal and intestinal infections of adult hookworms (Uncinaria spp.) in northern fur seal (Callorhinus ursinus) and California sea lion (Zalophus californianus) pups on San Miguel Island, California (2003). Parasitol. Res. 109:581-589.
- LAAKE, J. L., B. A. COLLIER, M. L. MORRISON, and R. N. WILKINS.
2011. Point-based mark-recapture distance sampling. J. Agric. Biol. Environ. Stat. 16(3): 389–408.
- HASTINGS, K. K., L. A. JEMISON, T. S. GELATT, J. L. LAAKE, G. W. PENDLETON, J. C. KING, A. W. TRITES, and K. W. PITCHER.
2011. Cohort effects and spatial variation in age-specific survival of Steller sea lions from southeastern Alaska. Ecosphere 2(Article 111):1-21. Online.
- ALLEN, B. M., and R. P. ANGLISS.
2011. Alaska marine mammal stock assessments, 2010. U.S. Dep. Commer., NOAA Tech. Memo. NMFS-AFSC-223, 292 p. (.pdf, 9.5 MB). Online.
- ORR, A. J., G. R. VanBLARICOM, R. L. DeLONG, V. H. CRUZ-ESCALONA, and S. D. NEWSOME.
2011. Intraspecific comparison of diet of California sea lions (Zalophus californianus) assessed using fecal and stable isotope analyses. Can. J. Zool. 89: 109-122.
- HUBER, H. R., J. C. JORGENSEN, V. L. BUTLER, G. BAKER, and R. STEVENS.
2011. Can salmonids (Oncorhynchus spp.) be identified to species using vertebral morphometrics? J. Archaeolog. Sci. 38:136-146.
- MELIN, S. R., A. J. ORR, J. D. HARRIS, J. L. LAAKE, R. L. DeLONG, F. M. D. GULLAND, and S. STOUDT.
2010. Unprecedented mortality of California sea lion pups associated with anomalous oceanographic conditions along the central California coast in 2009. Calif. Coop. Oceanic. Fish. Invest. Rep. 51:182-194.
- Additional recent California Current Ecosystems Program publications
- 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, 1.06MB) 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
(2009 poster, .pdf, 1.49MB) 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.
- Ontogeny of Diving Behaviors of Immature California Sea Lions (Zalophus californianus)
By: ANTHONY J. ORR, ROBERT L. DeLONG, GLENN R. VanBLARICOM, MILES L. LOGSDON
Conference: Biology of Marine Mammals 16th Biennial Conf., Society for Marine Mammalogy, San Diego, CA, Dec 2005
(2005 poster, .pdf, 180KB) Online.
- Abundance and Ecological Distribution of Antarctic Pack Ice Seals in the Pacific Sector of the Southern Ocean
By: P. L. BOVENG, J. L. BENGTSON, J. L. LAAKE, M. F. CAMERON
Conference: Biology of Marine Mammals 16th Biennial Conf., Society for Marine Mammalogy, San Diego, CA, Dec 2005
(2005 poster, .pdf, 5.42MB) Online.
- Additional recent California Current Ecosystems Program poster presentations