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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on May 20, 2008
ICES Journal of Marine Science: Journal du Conseil 2008 65(6):1046-1056; doi:10.1093/icesjms/fsn077
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© 2008 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Annual prey consumption of a dominant seabird, the common murre, in the California Current system

Jennifer E. Roth1, Nadav Nur1, Pete Warzybok1,3 and William J. Sydeman1,2

1 PRBO Conservation Science, 3820 Cypress Drive #11, Petaluma, CA 94954, USA
2 (present address): Farallon Institute for Advanced Ecosystem Research, PO Box 750756, Petaluma, CA 94975, USA
3 Department of Wildlife, Humboldt State University, Arcata, CA 95521, USA

Correspondence to J. E. Roth: tel: +1 707 781 2555 ext. 305; fax: +1 707 765 1685; e-mail: jroth{at}prbo.org

Roth, J. E., Nur, N., Warzybok, P., and Sydeman, W. J. 2008. Annual prey consumption of a dominant seabird, the common murre, in the California Current system. – ICES Journal of Marine Science, 65: 1046–1056.

Information compiled from the literature on population size, diet composition, field metabolic rate, prey energy densities, and assimilation efficiency is used to estimate annual prey consumption by common murres (Uria aalge), between Cape Blanco, OR, and Point Conception, CA, USA. The population consumed an estimated 172 313 t of prey based on population estimates and diet data from the mid- to the late 1980s, including 50 125 t consumed by breeding adults, 36 940 t by non-breeding birds during the breeding season, 85 098 t by all birds during the wintering period, and 150 t by dependent chicks before their leaving the breeding colonies. The population in the mid-2000s consumed 225 235 t of prey based on population estimates from 2004, including 65 516 t consumed by breeding adults, 48 283 t by non-breeding birds during the breeding season, 111 226 t by all birds during the wintering period, and 210 t by chicks at breeding colonies. Monte Carlo simulations indicated that the coefficients of variation around our overall prey consumption estimates were ±14.4% for the 1980s and ±13.2% for the 2000s.

Keywords: bioenergetics model, common murre, ecosystem-based management, top predators, Uria aalge

Received 15 August 2007; accepted 12 April 2008; advance access publication 20 May 2008.


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