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First published online August 17, 2006
Journal of Experimental Biology 209, 3469-3475 (2006)
Published by The Company of Biologists 2006
doi: 10.1242/jeb.02387
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Freezing or supercooling: how does an aquatic subterranean crustacean survive exposures at subzero temperatures?

Julien Issartel1,*, Yann Voituron2, Valentina Odagescu3, Anne Baudot3, Geneviève Guillot4, Jean-Pierre Ruaud4, David Renault5, Philippe Vernon5 and Frédéric Hervant1

1 Ecologie des Hydrosystèmes Fluviaux, UMR CNRS 5023, Université Claude Bernard Lyon 1, 69622 Villeurbanne cedex, France
2 Laboratoire Souterrain de Moulis (CNRS), 09200 Moulis, France
3 Centre de Recherches sur les Très Basses Températures, CNRS, BP 166, 38042, Grenoble cedex 9, France
4 Unité de Recherche en Résonance Magnétique Médicale, UMR 8081 CNRS-Université Paris-Sud 91405 Orsay, France
5 Ecosystèmes - Biodiversité - Evolution, UMR CNRS 6553, Université Rennes 1, 35042 Rennes cedex, France


Figure 1
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  		Fig. 1. Glycogen content in N. rhenorhodanensis and G. fossarum after acclimations at 12°C, 3°C and -2°C. Values are means ± s.e.m. (N=10). FM, fresh mass. *Significant differences (P<0.05) between the acclimated and the control (12°C) groups.

 

Figure 2
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  		Fig. 2. Ice content (% of body water) after being inoculated at -2°C and completion of the exotherm in N. rhenorhodanensis and G. fossarum acclimated at 12°C, 3°C and -2°C. Values are means ± s.e.m. (N=10). *Significant differences (P<0.05) between the acclimated and the control (12°C) groups.

 

Figure 3
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  		Fig. 3. Relative amounts of bound water according to the nuclear magnetic resonance measurements in N. rhenorhodanensis and G. fossarum after acclimation at 12°C, 3°C and -2°C. Values are means ± s.e.m. (N=7). *Significant differences (P<0.05) between the acclimated and the control (12°C) groups.

 

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© The Company of Biologists Ltd 2006