The Copepods Calanus glacial is Jaschnov and Calanus finmarchicus (Gunnerus) in Canadian Arctic-Subarctic Waters

• Published in: Journal of the Fisheries Research Board of Canada
• Main Author: Grainger, E. H.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Canadian Science Publishing 1961
• Subjects: Arctic; Canada; Calanus finmarchicus; Calanus glacialis; North Atlantic; Subarctic; Copepods
• Online Access: http://dx.doi.org/10.1139/f61-051; http://www.nrcresearchpress.com/doi/pdf/10.1139/f61-051

The literature on Calanus finmarchicus (Gunnerus) in arctic-subarctic Canada is reviewed, and the history of the 2-size-group phenomenon in the North Atlantic subarctic region is discussed. Calanus glacialis Jaschnov is briefly described, and compared with material from North America, the characters emphasized being size and the structure of the fifth legs. It is concluded that specimens from arctic and subarctic North America agree essentially with C. glacialis, those from the subarctic and north boreal regions with C. finmarchicus. Occurrence of the 2 species in northern North America is given, that of the large glacialis alone being shown to coincide closely with the known extent of unmixed polar water, of the 2 together to occupy the region of mixed polar and Atlantic water, and of the small finmarchicus alone to inhabit Atlantic water.