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Vertical distribution of Calanus finmarchicus and C. helgolandicus in relation to the development of the seasonal thermocline in the Celtic Sea
Williams, R. (1985). Vertical distribution of Calanus finmarchicus and C. helgolandicus in relation to the development of the seasonal thermocline in the Celtic Sea. Mar. Biol. (Berl.) 86: 145-149
In: Marine Biology. Springer: Heidelberg; Berlin. ISSN 0025-3162, more
Peer reviewed article  

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Keywords
    Calanus helgolandicus (Claus, 1863) [WoRMS]; Calanus finmarchicus (Gunnerus, 1770) [WoRMS]; Marine

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  • Williams, R.

Abstract
    The geographical distribution and annual mean abundance of C. Finmarchicus (Gunnerus) and C. Helgolandicus (Claus) in the northern North Atlantic Ocean were shown in relation to the seasonal and annual fluctuations of abundance of the species in the Celtic Sea from 1960 to 1981. The two species respond differently to the development of the seasonal thermocline and halocline by taking up different vertical distributions in the water column. The species have the same foraging techniques and are able to exploit the same size spectrum of particulates. The isolating mechanisms whereby these two populations partition the habitat in the Celtic Sea are discussed.

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