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North Sea cod 'doomed by climate change' http://apocadocs.com/s.pl?1252504768
Species of plankton, on which cod larvae feed, have moved away in search of cooler waters. The decline in cod stocks has led to an explosion in the populations of crabs and jellyfish, on which the adult fish feed.
The shortage of predators at the top of the food chain has had a knock-on effect on flat fish, such as plaice and sole, whose offspring are eaten by crabs.... The researchers studied the distribution of surface-dwelling copepod plankton on which young cod feed. Copepod's numbers have declined by more than 60 per cent as the sea has warmed over the last four decades.
Dr Kirkby said: "The plankton that young cod usually eat during March, April and May, a species of copepod that is the size of a grain of rice, prefer cold water and so they have become much less frequent as the North Sea has warmed.... "As top predators such as cod are declining, this appears to have had a cascading effect on the whole ecosystem."
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[Read more stories about:
overfishing, predator depletion, ocean warming, ecosystem interrelationships]
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