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The seasonal abundance of the copepodite stages of Calanus helgolandicus and Pseudocalanus elongatus off Plymouth

Published online by Cambridge University Press:  11 May 2009

E. P. Green ,
R. P. Harris  and
A. Duncan
E. P. Green
Affiliation:
Plymouth Marine Laboratory, Prospect Place, The Hoe, Plymouth, PL1 3DH.
R. P. Harris
Affiliation:
Plymouth Marine Laboratory, Prospect Place, The Hoe, Plymouth, PL1 3DH.
A. Duncan
Affiliation:
Department of Biology, Royal Holloway and Bedford New College, Egham, Surrey, TW20 0EX.:
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Extract

The relative abundance of the six copepodite stages (CI-CVI) of Calanus helgolandicus Claus (Copepoda: Calanoida) and Pseudocalanus elongatus Boeck (Copepoda: Calanoida) was recorded at a station in the English Channel throughout 1989. There was a pronounced seasonal variation in the abundance of the early stages. Increased recruitment from the nauplii corresponded in both species to rising primary production early in the year, producing small CI abundance peaks in March. The major period of naupliar development occurred after the April/May spring bloom. During seasonal peaks the CI and CII stages typically formed 40% of the copepodites of these species but were scarce at other times. The body carbon weight of Calanus and Pseudocalanus CIs decreased by 38% and 21% respectively from May to August, indicating an increase in food limitation for the nauplii. Summer was passed predominantly in the CIV and CV stage at low abundances.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 73 , Issue 1 , February 1993 , pp. 109 - 122
Copyright
Copyright © Marine Biological Association of the United Kingdom 1993

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