Abstract
DURING an ecological survey of the River Ivel1, a chalk stream in Bedfordshire, it was observed that shells of the snail Potamopyrgus jenkinsi (Smith) were heavily encrusted with calcareous nodules upstream of a sewage effluent discharge whereas downstream of the discharge such shells were clean (Fig. 1). Above the sewage effluent, snails were more than 70 per cent heavier than those below the effluent (Table 1). 
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References
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EDWARDS, R., HEYWOOD, J. Effect of a Sewage Effluent Discharge on the Deposition of Calcium Carbonate on Shells of the Snail Potamopyrgus jenkinsi (Smith). Nature 186, 492–493 (1960). https://doi.org/10.1038/186492a0
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DOI: https://doi.org/10.1038/186492a0
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