In order to find out which chironomid species are able to hibernate in shallow rock pools, larvae were collected at the end of April and beginning of May from 11 pools in the archipelago near Bergen, Norway. Nine of the pools were wholly frozen in the winter. The larvae were reared in the laboratory and the adults collected and identified. The most common species were Chironomus pseudothummi Strenzke, and Tanytarsus gracilentus Holmgren which occurred in 5 and 7 rock pools respectively. Prodadius cf. simplicistilus Freeman, Cricotopus silvestris Fabricius, Psectrocladius limbatellus (Holmgren) Edwards, Glyptotendipes paripes Edwards, Chironomus pseudothummi, Tanytarsus gracilentus, T. holochlorus Edwards, T. telmaticus Lindeberg, Paratanytarsus austriacus Kieffer, and P. setosimanus Goetghebuer were found to hibernate in a frozen condition. Of the 12 species found all but 3 are new to Norway. Also Chironomus salinarius Kieffer, which lives in shallow inlets of the sea but is not found in the rock pools of the observation area, is a new species to Norway.
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Raili Koskinen (1967) studied this question.
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