Ecosystem Survey of Delphinus Species

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Carretta, J. V., Chivers, S. J., and Perryman, W. L. 2011. Abundance of the long-beaked common dolphin (Delphinus capensis) in California and western Baja California waters estimated from a 2009 ship-based line-transect survey. Bull. Southern California Acad. Sci. 110(3): 152-164.

Associated abstracts, 2011 Marine Mammal Conference

Chivers, Susan J; Perryman, Wayne L; Lynn, Morgan S; Danil,Kerri; Berman, Michelle; Dines, James P. Aerial photographs reveal unique breeding characteristics for Delphinuscapensis and D. delphis off southern California, USA and BajaCalifornia, Mexico.

Kellar, Nicholas M.; Trego, Marisa L.; Chivers, Susan J.;Archer, Frederick I.; Carretta, James V.; Minich, Jeremiah J.; Perryman, WayneL. Are there biases in biopsy sampling?Investigating the potential drivers of sex-skew in projectile biopsy samplesfrom two small delphinids.

Redfern, J. V., M. F. McKenna, T. J. Moore, J. Calambokidis,M. L. DeAngelis, E. A. Becker, J. Barlow, K. A. Forney, P. C. Fiedler, S. J.Chivers. Mitigating the risk of large-whale ship strikes in a marine spatialplanning context: a case study in the Southern California Bight

Ecosystem Survey of Delphinus Species 2009: Mandates and Overview (PDF)

Delphinus species cruise report - NOAA Tech memo NMFS SWFSC-464

This survey focused on two species of common dolphin: the short-beaked common dolphin, Delphinus delphis , and the long-beaked common dolphin, Delphinus capensis , off southern California, USA and Baja California, Mexico. Our goal was to answer the following questions:

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• How are these dolphin populations structured? [ Delphinus Conservation Genetics, Marine Mammal Genetics]

• What are the reproductive rates of these populations? [ Life History Program Steroid Study]

• What proportion of these dolphins move back and forth between U.S. and Mexico waters?

• How many animals are in each population? [ Cetacean Abundance (Stock Assessments), Cetacean Distribution Maps]

• How is each dolphin population responding to changes in oceanographic conditions and habitat quality? [ Ecosystem Studies Program]

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Chief Scientist: Dr. Susan Chivers
Mexico Collaborating Scientists:
Dr. Lorenzo Rojas Bracho, Coordinador, Investigación y Conservación de Mamíferos Marinos, Instituto Nacional de Ecología (INE), Enseñada, Baja California
Dr. Jorge Urban, Director del Programa De Investigación De Mamíferos Marinos (PRIMMA), Universidad Autónoma de Baja California Sur, La Paz, Baja California

Survey Coordinator: Annette Henry

Both species of common dolphin inhabit the waters of the Southern CA Bight, an area that stretches from Point Conception to south of San Diego and includes the Channel Islands. This area is a major part of our study area, which includes the large coastal urban centers of Los Angeles and San Diego. The dolphins in this area are at risk from commercial and recreational fishing activities (for example, dolphins are caught as bycatch [a copy of the Pacific Marine Mammal Stock Assessment Report is available in pdf format]), and pollution generated by activities on land and in the ocean. Finding answers to the above questions during this study will enable us to make sound management decisions about these protected species.

Slideshow Overview of Delphinus Survey

Delphinus Slideshow

Last modified: 12/24/2014