Food habits of Steller sea lions (Eumetopias jubatus) off Oregon and northern California, 1986–2007

Riemer, Susan D. and Wright, Bryan E. and Brown, Robin F. (2011) Food habits of Steller sea lions (Eumetopias jubatus) off Oregon and northern California, 1986–2007. Fishery Bulletin, 109(4), pp. 369-381.

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Abstract

We described the diet of the eastern stock of Steller sea lions (Eumetopias jubatus) from 1416 scat samples collected from five sites in Oregon and northern California from 1986 through 2007. A total of 47 prey types from 30 families were identified. The most common prey was Pacific hake (Merluccius productus), followed by salmonids (Oncorhynchus spp.), skates (Rajidae), Pacific lamprey (Lampetra tridentata), herrings (Clupeidae), rockfish (Sebastes spp.), and northern anchovy (Engraulis mordax). Steller sea lion diet composition varied seasonally, annually, and spatially. Hake and salmonids were the most commonly identified prey in scats collected during the summer (breeding season), whereas hake and skate were most common in the nonbreeding season. Continued research on Steller sea lion diet and foraging behavior in the southern extent of their range is necessary to address issues such as climate change, interaction with competing California sea lions, and predation impacts on valuable or sensitive fish stocks.

Item Type: Article
Title: Food habits of Steller sea lions (Eumetopias jubatus) off Oregon and northern California, 1986–2007
Personal Creator/Author:
CreatorsEmail
Riemer, Susan D.
Wright, Bryan E.
Brown, Robin F.
Refereed: Yes
Journal or Publication Title: Fishery Bulletin
Volume: 109
Number: 4
Page Range: pp. 369-381
Date: 2011
ISSN: 0090-0656
Issuing Agency: United States National Marine Fisheries Service
Subjects: Biology
Ecology
Fisheries
Item ID: 8697
Depositing User: Patti M. Marraro
Date Deposited: 07 Jun 2012 14:50
Last Modified: 07 Jun 2012 14:50
URI: http://aquaticcommons.org/id/eprint/8697

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