Inverse relationship between cod recruitment in the North Sea and young fish in the continous plankton recorder survey
Lindley, J.A.; Reid, P.C.; Brander, K.M. (2003). Inverse relationship between cod recruitment in the North Sea and young fish in the continous plankton recorder survey. Sci. Mar. (Barc.) 67(S1): 191-200. https://dx.doi.org/10.3989/scimar.2003.67s1191 In: Scientia Marina (Barcelona). Consejo Superior de Investigaciones Científicas. Institut de Ciènces del Mar: Barcelona. ISSN 0214-8358; e-ISSN 1886-8134, more Also appears in:Ulltang, Ø.; Blom, G. (2003). Fish stock assessments and predictions: integrating relevant knowledge. SAP Symposium held in Bergen, Norway 4-6 December 2000. Scientia Marina (Barcelona), 67(S1). Institut de Ciències de Mar: Barcelona. 374 pp. https://dx.doi.org/10.3989/scimar.2003.67s1, more |   |
| Keywords | Aquatic communities > Plankton
Aquatic organisms > Marine organisms > Fish > Marine fish
Organisms > Aquatic organisms > Animals > Aquatic animals > Marine animals > Fishes > Aquatic animals > Marine fishes > Osteichthyes > Cod
Population functions > Recruitment
Temporal variations > Long-term changes
Gadus morhua Linnaeus, 1758 [WoRMS]
ANE, North Sea [Marine Regions]
Marine/Coastal |
| Authors | | Top | - Lindley, J.A., more
- Reid, P.C., more
- Brander, K.M.
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| Abstract | There is a significant (p<0.01) negative correlation between cod recruitment (age 1 year) and the numbers of young fish taken in the Continuous Plankton Recorder (CPR) Survey in the North Sea. This correlation is analysed with reference to hydrographic, climatic and biological variables in order to determine whether it results from opposite responses to physical forcing, trophic relationships or a combination of these. The results of correlation analyses are consistent with cod recruitment being determined mainly during the planktonic phase of development in the preceding year. Multiple regressions indicate that a combination of the North Atlantic Oscillation index in the preceding year and the abundance of CPR young fish is the pair of variables that provide the best fit to the data. The abundance of CPR young fish is best predicted by the Gulf Stream North Wall Index and the abundance of phytoplankton in the spring of the previous year. Opposite responses to climatic forcing and the regional environmental consequences are identified as of primary importance but interactions, possibly both predation and competition, occur between the planktonic stages of cod and both the planktonic stages of fish and the stocks from which they were derived. |
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