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ICES Journal of Marine Science: Journal du Conseil Advance Access published online on September 25, 2009
ICES Journal of Marine Science: Journal du Conseil, doi:10.1093/icesjms/fsp227
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© Fisheries and Oceans Canada, 2009. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Stable isotope analysis of marine feeding signatures of Atlantic salmon in the North Atlantic

J. Brian Dempson1, Victoria A. Braithwaite2, Denis Doherty3 and Michael Power4

1 Fisheries and Oceans Canada, Science Branch, PO Box 5667, St John's, NL, Canada A1C 5X1
2 School of Forest Resources and Department of Biology, The Pennsylvania State University, University Park, PA 16802, USA
3 Electricity Supply Board, Fisheries Conservation, Ardnacrusha, Co. Clare, Via Limerick, Ireland
4 Department of Biology, University of Waterloo, 200 University Avenue West, Waterloo, ON, Canada N2L 3G1

Correspondence to M. Power: Tel: +1 519 888 4567; fax: +1 519 746 0614; e-mail: m3power{at}sciborg.uwaterloo.ca.

Dempson, J. B., Braithwaite, V. A., Doherty, D., and Power, M. 2010. Stable isotope analysis of marine feeding signatures of Atlantic salmon in the North Atlantic. – ICES Journal of Marine Science, 67: 000–000.

Differences in the marine feeding of three geographically distinct populations of Atlantic salmon (Salmo salar) in the North Atlantic (Conne River, Newfoundland; Koksoak River, Ungava Bay, Québec; River Erne, northwest Ireland) were examined using analyses of stable isotopes of carbon and nitrogen ({delta}13C and {delta}15N) and contrasted with isotope signatures obtained from a sample of salmon of unknown origin captured in the Labrador Sea. Although the overall range of {delta}13C and {delta}15N values ({delta}13C: X from –22.42 to –19.37; {delta}15N: X from 10.70 to 13.38) was similar to that reported by others, significant differences were found among populations and between different sea-age life-history groups. Reported differences in marine feeding between populations from the Northeast and Northwest Atlantic corroborated the stable isotope results. A surrogate measure of lipid content, the C:N ratio, was also compared among 1-sea-winter salmon. The highest levels were associated with the Koksoak River, suggesting that Subarctic populations may require higher energy reserves to contend with their longer migrations and more-severe environmental conditions.

Keywords: Atlantic salmon, C:N ratio, Ireland, lipid reserves, marine feeding, Newfoundland, stable isotopes, Ungava Bay

Received 19 January 2009; accepted 10 August 2009.


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