Abstract
The species composition of epipelic algal assemblages on intertidal mudflats was investigated at three sites in the Severn estuary, England, between March 1990 and February 1991. Diatoms were the dominant algal group, comprising greater than 95% of living cells in 100 out of 106 lens tissue samples. Euglenoid algae were abundant at one site during the summer months. Although over 60 diatom taxa were identified, only 15–20 species occurred regularly, with 12 species being dominant in the samples. Upper and middle shore diatom assemblages were dominated by Navicula pargemina during the spring and autumn, and by Nitzschia epithemioides during the early summer months. High relative abundances of Rhaphoneis minutissima were recorded at lower shore stations throughout the year and on upper and middle shores during the winter months. These lower shore assemblages contained high proportions of epipsammic species (Coscinodiscus sp., Cymatosira belgica). Principal component scores (obtained from assemblage composit...
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