|Changes in the zooplankton of the North Sea, 1948 to 1973|
Colebrook, J.M. (1978). Changes in the zooplankton of the North Sea, 1948 to 1973. Rapp. et Proc.-Verb. Cons. Int. Explor. Mer 172: 390-396
In: Rapports et Procès-Verbaux des Réunions du Conseil Permanent International pour l'Exploration de la Mer. Conseil Permanent International pour l'Exploration de la Mer: Copenhague. ISSN 0074-4336, more
Annual variations; Zooplankton; Marine
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A routine, monthly, synoptic survey of zooplankton of the North Sea and the Northeast Atlantic has been carried out using Continuous Plankton Recorders from 1948 to the present. Plankton recorders are towed at a standard depth of 10 m behind merchant ships and ocean weather ships along a number of more or less fixed routes. The recorders collect a continuous sample which for the purpose of analysis is divided into sections each representing 10 miles of towing. As far as possible the zooplankton are identified as to species but, in some taxonomic groups identification is confined to genus, family or higher categories. The survey provides information about the seasonal, geographical and annual fluctuations in abundance of the species. This paper is confined to a summary presentation of some of the main features of year-to-year changes in the abundance of zooplankton in the North Sea.