Abundance and population density of cetaceans in the California Current ecosystem


Autoria(s): Barlow, Jay; Forney, Karin A.
Data(s)

2007

Resumo

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.

Formato

application/pdf

Identificador

http://aquaticcommons.org/8866/1/barlow_Fish_Bull_2007.pdf

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.

Idioma(s)

en

Relação

http://aquaticcommons.org/8866/

http://fishbull.noaa.gov/1054/barlow.pdf

Palavras-Chave #Biology #Ecology #Fisheries
Tipo

Article

PeerReviewed