Abundance and population density of cetaceans in the California Current ecosystem

Barlow, Jay and Forney, Karin A. (2007) Abundance and population density of cetaceans in the California Current ecosystem. Fishery Bulletin, 105(4), pp. 509-526.

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Abstract

The abundance and population density of cetaceans along the U.S. west coast were estimated from ship surveys conducted in the summer and fall of 1991, 1993, 1996, 2001, and 2005 by using multiple-covariate, line-transect analyses. Overall, approximately 556,000 cetaceans of 21 species were estimated to be in the 1,141,800-km2 study area. Delphinoids (Delphinidae and Phocoenidae), the most abundant group, numbered ~540,000 individuals. Abundance in other taxonomic groups included ~5800 baleen whales (Mysticeti), ~7000 beaked whales (Ziphiidae), and ~3200 sperm whales (Physeteridae). This study provides the longest time series of abundance estimates that includes all the cetacean species in any marine ecosystem. These estimates will be used to interpret the impacts of human-caused mortality (such as that documented in fishery bycatch and that caused by ship strikes and other means) and to evaluate the ecological role of cetaceans in the California Current ecosystem.

Item Type: Article
Title: Abundance and population density of cetaceans in the California Current ecosystem
Personal Creator/Author:
CreatorsEmail
Barlow, Jay
Forney, Karin A.
Refereed: Yes
Journal or Publication Title: Fishery Bulletin
Volume: 105
Number: 4
Page Range: pp. 509-526
Date: 2007
ISSN: 0090-0656
Issuing Agency: United States National Marine Fisheries Service
Subjects: Biology
Ecology
Fisheries
Item ID: 8866
Depositing User: Patti M. Marraro
Date Deposited: 18 Jun 2012 09:40
Last Modified: 18 Jun 2012 09:40
URI: http://aquaticcommons.org/id/eprint/8866

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