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Murres, capelin and ocean climate: Inter-annual associations across a decadal shift

January 1, 2009

To ensure energy demands for reproduction are met, it is essential that marine birds breed during periods of peak food availability. We examined associations of the breeding chronology of common murres (Uria aalge) with the timing of the inshore arrival of their primary prey, capelin (Mallotus villosus) from 1980 to 2006 across a period of pervasive change in the Northwest Atlantic ecosystem. We also assessed the influence of ocean temperature and the North Atlantic Oscillation (NAO; an index of winter climate and oceanography) on these interactions. We found a lagged linear relationship between variations in murre breeding chronology and the timing of capelin arrival in the previous year. On a decadal level, we found a non-linear threshold relationship between ocean temperature and the timing of capelin arrival and murre breeding. Centennially anomalous cold water temperatures in 1991 generated a marked shift in the timing of capelin spawning inshore and murre breeding, delaying both by more than 2 weeks. By the mid-1990s, ocean temperatures returned to pre-perturbation levels, whereas the temporal breeding responses of capelin and murres were delayed for a decade or more. Oceanographic conditions (temperature, NAO) were poor predictors of the timing of capelin arrival inshore in the current year compared to the previous one. Our findings suggest that knowledge of the timing of capelin availability in the previous year provides a robust cue for the long-lived murres, allowing them to achieve temporal overlap between breeding and peak capelin availability. ?? Springer Science+Business Media B.V. 2008.

Publication Year 2009
Title Murres, capelin and ocean climate: Inter-annual associations across a decadal shift
DOI 10.1007/s10661-008-0484-2
Authors P.M. Regular, F. Shuhood, T. Power, W.A. Montevecchi, G.J. Robertson, D. Ballam, John F. Piatt, B. Nakashima
Publication Type Article
Publication Subtype Journal Article
Series Title Environmental Monitoring and Assessment
Index ID 70035693
Record Source USGS Publications Warehouse