Seabird Abstracts

Zooplankton Communities in the Bristol Channel and Severn Estuary

Collins NR & Williams R (1982) Mar Ecol Prog Ser 9:1-11

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 classification 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 month, chosen to represent the seasonal features of a time series extending from November 1973 to February 1975. A strong relationship 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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