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JOURNAL OF PLANKTON RESEARCH | VOLUME 19 | NUMBER 8 | PAGES 1175-1182 | 1997
© Oxford University Press

research-article

The occurrence of Calanus finmarchicus (Gunnerus) and Calanus helgolandicus (Claus) in the western Irish Sea

R.J. Gowen, M. Dickey-Collas and G. McCullough1

Agricultural and Environmental Science Division, Department of Agriculture for Northern Ireland The Queens University of Belfast Newforge Lane, Belfast BT9 5PX, UK 1Department of Agricultural and Environmental Science, The Queens University of Belfast Newforge Lane, Belfast BT9 5PX, UK

Received on February 15, 1997; accepted on April 16, 1997 The seasonal abundance of Calanus finmarchicus and Calanus helgolandicus in the North Channel and stratified region of the western Irish Sea is reviewed using data collected between 1992 and 1996. Both species occur in the western Irish Sea, but were more abundant in the stratified region during spring. Increased abundance during May/June was attributed to an increase in copepodite stages. Calanus helgolandicus dominated in both regions, exhibiting spring and autumn peaks in abundance in the stratified region. It is argued that the presence of ripe females and naupliar stages in the stratified region is evidence of an in situ breeding population, rather than advection of individuals from population centres outside the Irish Sea. The lack of geographical separation of the two species in the western Irish sea, and reports that both species occur in the Celtic Sea and Malin Shelf, limit the use of either species as indicators of exchange processes between the Irish Sea and neighbouring waters.


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R. D. M. Nash and A. J. Geffen
Seasonal and interannual variation in abundance of Calanus finmarchicus (Gunnerus) and Calanus helgolandicus (Claus) in inshore waters (west coast of the Isle of Man) in the central Irish Sea
J. Plankton Res., March 1, 2004; 26(3): 265 - 273.
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