Upper temperature tolerances of some European molluscs II. Donax vittatus,D. semistriatus and D. trunculus |
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| Authors: | A D Ansell P R O Barnett A Bodoy H Massé |
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| Institution: | (1) Dunstaffnage Marine Research Laboratory, Scottish Marine Biological Association, P. O. Box 3, PA34 4AD Oban, Argyll, Scotland;(2) Station Marine d'Endoume et Centre d'Océanographie, Rue de la Batterie-des-Lions, F-13007 Marseille, France |
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| Abstract: | The upper temperature tolerances of 3 European species of Donax D. vittatus (da Costa), D. semistriatus Poli, D. trunculus L.] are compared by means of median lethal temperatures (LT50) and median burial temperature (BT50) determinations for periods of exposure up to 96 h. The influence of previous acclimation temperatures on these determinations is also considered. D. trunculus shows the greatest thermal tolerance, reflecting its distribution in shallower water; D. vittatus and D. semistriatus display much closer thermal tolerances, although D. semistriatus which has a more southerly geographical distribution has a slightly higher thermal tolerance. All 3 species exhibit a significant effect of previous acclimation temperature, the effect on the burrowing responses being greater than that on LT50. |
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