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Prodigal plankton species makes first known migration from Pacific to Atlantic via Pole
Date:6/25/2011

thereby recruitment, making the reconstitution of the stock difficult." Young cod rely on the copepod Calanus finmarchicus, the migration of which 1,000 kilometres to the north inhibits the cod from re-establishing in the southern North Sea.

  • Warmer temperatures and stratification of the water are allowing living and dead microscopic organic matter to form massive, mucous-like blobs of marine mucilage in the Mediterranean Sea. This noxious material harbours bacteria and viruses that could kill fish.

  • In the North Sea, several fish species, including sea bass, mullet, solenette and scaldfish, are moving northward and increasing in numbers as the water warms, according to experts at the NIOZ Royal Netherlands Institute for Sea Research and the Netherlands Institute for Ecology (NIOO).

    "The predictions of higher average temperatures and milder winters in the North Sea make it likely that these species will increase further in abundance and move northward," say NIOO scientists. This "will affect the North Sea food web and therefore commercial species by predation on juveniles and competition for food resources."

    The impacts of some observed changes remain difficult to assess because the web of life in the oceans, and the forces that shape it, are so complex, and so little is known about them. Some impacts will combine to magnify their effects on ocean life; others might neutralize each other.

    In the Baltic Sea, for example, warmer temperatures should improve biodiversity. But the sea is also expected to become less salty, which would reduce the number of fish species.

    If, as forecast, sea levels rise, newly flooded coastal areas in Europe will provide more fish habitat. On the other hand, studies suggest a combination of rising temperature and decreasing oxygen could degrade the coastal habitats for bottom-living fish species such as cod and flatfish, particularly in areas that already recei
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  • Contact: Terry Collins
    tc@tca.tc
    416-538-8712
    Flanders Marine Institute (VLIZ)
    Source:Eurekalert

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