During the year 1973-74 samples of sea water were collected fortnightly from the Menai Straits. Glycollate and pigment concentrations were estimated and counts made of the predominating phytoplankton species. Over a shorter period, primary productivity and total extracellular products of photosynthesis were estimated by the radiocarbon method. The variation in glycollate level was in the range 0-60 /ig l~1. Statistically significant correlations between glycollate concentrations and chlorophyll a, total pigments and percentage extracellular release were found but there was no significant correlation with numbers of any one phytoplankton species.
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