Potamopyrgus antipodarum pool fed by drain at top of salting, Dee Estuary, Cheshire. Salinity 0 p.p.t. Filamentous algae over bare sand, black and anaerobic below surface. Near high water mark; Scirpus maritimus beyond log in image.

Submitted by Ian Smith on Sun, 18/09/2011 13:56
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I.F. Smith
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