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      Plankton effect on cod recruitment in the North Sea.

      Nature

      Survival Rate, Temperature, Ecosystem, Fishes, Diet, growth & development, physiology, Larva, North Sea, Plankton, Population Dynamics, Seasons, Seawater, Animals, Biomass

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          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.

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          Most cited references 19

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          Stock and Recruitment

           W. Ricker (1954)
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            Singular-spectrum analysis: A toolkit for short, noisy chaotic signals

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              Marine ecology: Spring algal bloom and larval fish survival.

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                Author and article information

                Journal
                10.1038/nature02164
                14668864

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