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- W2081425666 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 325:227-241 (2006) - doi:10.3354/meps325227 Cod and climate: effect of the North Atlantic Oscillation on recruitment in the North Atlantic Leif Chr. Stige1, Geir Ottersen2,6, Keith Brander3, Kung-Sik Chan4, Nils Chr. Stenseth1,5,* 1Centre for Ecological and Evolutionary Synthesis (CEES), Department of Biology, University of Oslo, PO Box 1066 Blindern, 0316 Oslo, Norway 2Institute of Marine Research, PO Box 1870, 5817 Bergen, Norway 3International Council for the Exploration of the Sea, Palægade 24, 1261 Copenhagen K, Denmark 4Department of Statistics and Actuarial Science, University of Iowa, 263 Schaeffer Hall, Iowa City, Iowa 52242, USA 5Department of Coastal Zone Studies, Institute of Marine Research, Flødevigen Marine Research Station, 4817 His, Norway 6Present address: Centre for Ecological and Evolutionary Synthesis (CEES), Department of Biology, University of Oslo, PO Box 1066 Blindern, 0316 Oslo, Norway *Corresponding author. Email: n.c.stenseth@bio.uio.no ABSTRACT: The impact of the environment on interannual variability in fish recruitment has proven difficult to establish empirically, and environment-recruitment correlations have often been found to break down when more data become available. This may suggest that the statistical models have failed to capture the essential explanatory variables, or that environment-recruitment relationships are non-stationary, and thus actually change. The present paper explores the effect of climate, measured by the North Atlantic Oscillation (NAO), on the recruitment of North Atlantic cod Gadus morhua. The literature on the topic is reviewed and compared with results from a new analysis, in which data from all 22 main stocks are combined in 1 overall model. Results of the new analysis demonstrate (i) a geographic pattern in the effect of the NAO on recruitment, which resembles the geographic pattern of the correlation between the NAO and sea surface temperature, and (ii) trends in recruitment levels as well as in the effects of climate. These trends are not fully explainable through changes in spawning stock biomass. Summarizing the old and new insights, we arrive at the following general conclusions: NAO affects cod recruitment through local environmental variables such as sea temperature, salinity, oxygen, turbulence and advection. Cod recruitment is density-dependent, although the new analysis does not unequivocally support the existence of general patterns of density-dependent climate effects. There are trends in cod recruitment and in the relationship between climate and recruitment, possibly caused by demographic changes in the cod stocks (e.g. fishing-induced) and changes in the biotic or abiotic environment (regime shifts). KEY WORDS: Fish recruitment · Climate effect · Non-stationarity · Density-dependence · Gadus morhua Full text in pdf format Supplementary appendix PreviousNextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 325. Online publication date: November 07, 2006 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2006 Inter-Research." @default.
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- W2081425666 title "Cod and climate: effect of the North Atlantic Oscillation on recruitment in the North Atlantic" @default.
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