A long-term decline in krill density is linked to winter sea ice

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An analysis of decades of net-haul records from the Southern Ocean reports that krill density in the southwest Atlantic sector declined over the second half of the twentieth century, correlating with reduced winter sea-ice extent, while salps increased. It is the paper that made the krill-ice dependency a matter of measured record rather than of inference from life history, and the size of the decline has been argued over ever since.

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