High salinity tolerance in sea ice copepods

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Abstract
The ice meiofaunal cope pods Tisbefurcata, Cyclopina schneideri, C. gracilis and Arctocyclopina pagonasta and the pelagic copepods Calanus glacialis and Pseudocalanus sp. were subjected in the laboratory to salinities of 10,20,30,40,50,60 and 70%0. Survival of the ice animals was longest at 40‰, ofthe pelagic animals at 20‰. Tisbe survived 3 to 10 times longer than the pelagic copepods at 30, 40 and 50‰, and the ice copepods were the only survivors at 60 and 70‰. The ice animals were more tolerant than the pelagic copepods of the relatively high salinity conditions found in the lower levels of arctic winter sea ice.