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Zooplankton communities in the Bristol Channel and Severn estuary
Collins, N.R.; Williams, R. (1982). Zooplankton communities in the Bristol Channel and Severn estuary. Mar. Ecol. Prog. Ser. 9: 1-11.
In: Marine Ecology Progress Series. Inter-Research: Oldendorf/Luhe. ISSN 0171-8630, more
Peer reviewed article  

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  • Collins, N.R.
  • Williams, R.

    Zooplankton distributions in the Bristol Channel and Severn Estuary, for January, April and August 1974, were analysed using an hierarchical clustering technique (CLUSTER) and an ordination technique (multi-dimensional scaling). Shade-matrices were used to associate the groups of species with the groups of sampling sites derived from these techniques. Four groups of species or assemblages of zooplankton were described; these were numerically dominated by the calanoid copepods Eurytemora affinis (Poppe), Acartia bifilosa var. inermis Rose, Centropages hamatus (Lilljeborg) and Calanus helgolandicus (Claus), respectively . These 4 assemblages conformed to the generalised classifi cation of plankton according to salinity in estuaries : true estuarine, estuarine and marine, euryhaline marine, and stenohaline marine . The groups were relatively consistent over the 3 mo, chosen to represent the seasonal features of a time series extending from November 1973 to February 1975. A strong relati onship between the assemblages and salinity was demonstrated. It is suggested that these assemblages conformed to a working definition of a community.

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