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Plankton effect on cod recruitment in the North Sea.

Authors :
Beaugrand G
Brander KM
Alistair Lindley J
Souissi S
Reid PC
Source :
Nature [Nature] 2003 Dec 11; Vol. 426 (6967), pp. 661-4.
Publication Year :
2003

Abstract

The Atlantic cod (Gadus morhua L.) has been overexploited in the North Sea since the late 1960s and great concern has been expressed about the decline in cod biomass and recruitment. Here we show that, in addition to the effects of overfishing, fluctuations in plankton have resulted in long-term changes in cod recruitment in the North Sea (bottom-up control). Survival of larval cod is shown to depend on three key biological parameters of their prey: the mean size of prey, seasonal timing and abundance. We suggest a mechanism, involving the match/mismatch hypothesis, by which variability in temperature affects larval cod survival and conclude that rising temperature since the mid-1980s has modified the plankton ecosystem in a way that reduces the survival of young cod.

Details

Language :
English
ISSN :
1476-4687
Volume :
426
Issue :
6967
Database :
MEDLINE
Journal :
Nature
Publication Type :
Academic Journal
Accession number :
14668864
Full Text :
https://doi.org/10.1038/nature02164