Sodium uptake and transport (Na+ + K+)ATPase changes following Na+ depletion and low salinity acclimation in the mangrove crab Ucides cordatus (L.)

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Abstract

  • 1.

    1. Ucides cordatus in a medium isoionic for Na+ and isosmotic with the haemolymph (26%o salinity) has a relatively small active uptake component of Na+ influx (7% of Jin).

  • 2.

    2. In 9%o medium (hypo-osmotic to the haemolymph) Na+ is maintained by increased active uptake of Na+ (to 75% of Jin).

  • 3.

    3. Short-term Na+ depletion of animals acclimated to either medium stimulated active sodium uptake, increasing this component 4–5-fold.

  • 4.

    4. The net increase in active uptake was similar in both 26 and 9%o acclimated animals (~6μM g/hr), although the maximum rate was higher in the latter.

  • 5.

    5. After acclimation to 9%o (120hr), increases in gill and antennal gland (Na+ + K+)-ATPases were observed, notably in the posterior gill pairs.

  • 6.

    6. Mechanisms for the rapid Na+ depletion response and that of longer-term acclimation to low salinities in this euryhaline mangrove crab are discussed.

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