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Biol Bull 139: 351-362. (October 1970)
© 1970 Marine Biological Laboratory
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THE APPARENT WATER-PERMEABILITY OF CARCINUS MAENAS (CRUSTACEA, BRACHYURA, PORTUNIDAE) AS A FUNCTION OF SALINITY

RALPH I. SMITH 1

1 Department of Zoology and Dove Marine Laboratory (Cullercoats), University of Newcastle upon Tyne, England, U. K.

1. The apparent water-permeability of Carcinus maenas, as measured by D2O influx, is 2-3 times higher than that of the more euryhaline crab Rhithropanopeus.

2. Like Rhithropanopeus, Carcinus shows a reduction of water-exchange rate at lower salinities. The highest hourly water-exchange fraction is in 75% SW (K = 2.73), the lowest in 30% SW (K = 1.76); values refer to a crab with wet weight of 10 g, at 18° C.

3. The calculated net diffusional (osmotic) water influx is adequate to account for the urine production of Carcinus in 50-70% SW, but does not account for urine production in SW, and only inadequately for the urine produced in 30-40% SW, and it seems necessary to postulate some isotonic transport of water.






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