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Journal of Experimental Biology 51,591-605 (1969)
Published by Company of Biologists 1969

Active Transport and Sodium Fluxes at Moult in the Amphipod, Gammarus Duebeni

A. P. M. LOCKWOOD ¹ and W. R. H. ANDREWS ¹

¹ Department of Oceanography, University of Southampton

1. The sodium fluxes of individual Gammarus duebeni, which moulted in sea water, have been followed daily from the morning following moult for at least 6 days.

2. Sodium influx from sea water declined from 15.1µM/animal/hr. on the first morning after moult to 1.7µM/animal/hr. by the tenth day after moult.

3. Sodium influx from 10 mM/l. NaCl plus sucrose solution isotonic with sea water declines from 4.48µM/animal/hr. to 0.14µM/animal/hr. in inter-moult animals.

4. Thionine inhibits over 90% of the influx from 10 mM/l NaCl plus isotonic sucrose on the first day after moult, and this, together with other evidence, suggests that the major part of the influx from this medium is due to active sodium uptake. The rate of active uptake is comparable with, or faster than, the rate of uptake by animals acclimatized to fresh water.

5. The influx occurs primarily across the body surface. It is suggested that the high level of sodium uptake is associated with the water uptake which occurs at moult.

Note:

Division of Sea Fisheries, Beach Road, Seapoint, Cape Town, South Africa.