Water fluxes and urine production in blue crabs (Callinectes sapidus) as a function of environmental salinity |
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Affiliation: | 1. Biological Sciences, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada;2. Biology, Wilfrid Laurier University, Waterloo, Canada |
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Abstract: | - 1.1. Water efflux and urine production rates were measured in blue crabs acclimated to several salinities.
- 2.2. In 100% seawater the mean rate of water efflux (31.3 ml/100g hr−1) was significantly greater than that in 50% seawater (18.9 ml/100 g hr−1.
- 3.3. Water efflux was directly related to body weight.
- 4.4. The mean urine production rate was significantly greater in crabs acclimated to 50% and 30% seawater (0.17 and 0.18 ml/100g hr−1) than in animals conditioned to 100% seawater (0.09 ml/100 g hr−1).
- 5.5. The difference between theoretical net water fluxes for crabs exposed to 100% seawater and 50% seawater was similar to the difference in urine output in the same salinities, demonstrating the importance of the antennal gland in volume regulation.
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