ISSN:
1432-136X
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Biologie
,
Medizin
Notizen:
Summary 1. Chloride influx and efflux rates were measured in three populations of the freshwater amphipodCorophium curvispinum, a recent invader of freshwaters in the English Midlands. 2. Chloride permeability (PCl) was found to be greater than in other freshwater crustaceans. There were differences in PCl between populations (range 3.5–5.5·10−8 m sec−1). PCl was reduced by 50% after acclimation to low chloride media (0.5 mM [Cl−]). 3. The kinetic characteristics of the saturable chloride uptake systems (60% SCN− sensitive, but not significantly inhibited by 10−4 M external amiloride) of different populations were compared, and the effects of short-term acclimation (≥7 days) to low and high [Cl−] media studied. 4. Acclimation to different [Cl−] media had more marked effects on PCl than on the uptake parameters studied, although some changes in apparent affinity (K m) and uptake rate (V max) occurred. 5. Comparison of Cl− balance points with recently measured Na+ values in populations ofCorophium curvispinum, with reference to environmental [Na+] and [Cl−], suggest that low chloride, not low sodium may, at present, limit its distribution in freshwaters.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00692731
Permalink
