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Journal of Experimental Biology 53,93-100 (1970)
Published by Company of Biologists 1970

Chloride Regulation at Low Salinities by Nereis Diversicolor (Annelida, Polychaeta) : II. Water Fluxes and Apparent Permeability to Water

RALPH I. SMITH ¹

¹ Department of Zoology and Dove Marine Laboratory (Cullercoats), University of Newcastle upon Tyne; Department of Zoology, University of California, Berkeley, California 94720, U.S.A.

1. By studies of D₂O exchange the apparent permeability of Nereis diversicolor to water has been shown to vary in response to changes of salinity.

2. The hourly water-exchange fraction drops from over 12 in SW nearly to 6 in fresh water.

3. Calculation of the net flux of water indicates potential urine volumes of 0.3 % of body weight/h in SW, a maximum of 2.8 % in 10 % SW, and a reduction to 2.1 % in fresh water.

4. It is calculated that, if such urine volumes are produced, the urine is probably hypotonic in chloride to the coelomic fluid at salinities of 25 % SW and lower.