Contribution
Ökophysiologische Untersuchungen zur Säuretoleranz von Gammarus fossarum (Koch)
[Ecophysiological studies on acid tolerance of Gammarus fossarum]
Meinel, Werner; Matthias, Uwe; Zimmermann, Sonja
Archiv für Hydrobiologie Volume 104 Number 2 (1985), p. 287 - 302
18 références bibliographiques
publié: Aug 13, 1985
DOI: 10.1127/archiv-hydrobiol/104/1985/287
ArtNo. ESP141010402008, Prix: 29.00 €
Abstract
The acidification of running waters results in an aggravating reduction of the species composition. Gammarus fossarum is showing a very high sensitivity against low environmental pH and becomes damaged below pH 6 in low buffered waters. In some experiments G. fossarum was kept in acid waters (pH 4.5, 4.0, 3.5, 3.0) with different ionic composition. It was found out that the survival rate at pH 4.5 and 4.0 could be enhanced by increasing of the sodium concentration. Other cations (K+, Mg2+, Ca2+) had no significant influence. The positive effect of sodium was related to the presence of chloride. With other anions (SO42-) the efficiency of sodium for the survival rate is smaller. Below pH 4.0 the addition of sodium could not increase the survival time. We guess that the toxicity of environmental pH till 4.0 is caused by a failure of ionic regulation, expecially by a break down of the sodium and chloride uptake. In waters with higher H+-concentration other mechanisms, like acidbase balance and gas echange, could be damaged.
Mots-clefs
Gammarus fossarum • sodium • chloride • water • acid tolerance