On the Size of Calanus hyperboreus Krøyer in West Greenland Waters

✍ Scribed by Dr. P. Jespersen

• Book ID: 102284900
• Publisher: John Wiley and Sons
• Year: 1937
• Tongue: English
• Weight: 225 KB
• Volume: 34
• Category: Article
• ISSN: 1434-2944
• DOI: 10.1002/iroh.19370340108

✦ Synopsis

Working out a large material of copepods from the Davis Strait and Baffin Bayl) I measured the length of the cephalothorax of a considerable number of Calanus finmarchicus (Gunner). The variation in size for this species was found to fall into two clearly marked sizegroups as first shown by Stormer2). The investigations of the Godthaab Expedition established the fact that the larger sized group occurred most abundantly a t the extreme northerly stations and at those close to the western side of the more southern part of the investigated area (1. c. pp. 21-30).

A similar investigation, by measuring the cephalothorax, was carried out with the closely related species Calanus hyperboreus Krayer, but this species, though found with a wide variation of sizes, showed only a single size-group. In Fig. 1 is reproduced a figure showing the length of cephalothorax in respect of 1792 individuals of stage VI 9.