Influence of temperature acclimation and gut content on the supercooling ability of the land snail Cornu aspersum - Université de Rennes Accéder directement au contenu
Article Dans Une Revue Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology Année : 2008

Influence of temperature acclimation and gut content on the supercooling ability of the land snail Cornu aspersum

Résumé

The invasive land snail Cornu aspersum possesses a lowability to supercool (c. −5 °C inwinter) and survives only minimal ice formation in its body fluids, what may limit its expansion to colder environments. In the present study,we investigated the influence of acclimation and starvation on its supercooling ability. During eight weeks, individuals were maintained at 20 °C, fed or starved, or placed at 5 °C, directly or with progressive acclimation to cold and shorter photoperiod. Temperature of crystallisation of whole individual (TcI) and hemolymph (TcH), mass data and gut content were recorded every two weeks. Hemolymphatic glucose and glycerol were measured at the end of experiment and occurrence of intestinal ice-nucleating agents (INA) was researched. Acclimation had no effect on TcI but stimulated purging of the gut. Starvation induced a slight decrease of TcI whereas a high quantity of alimentary particles in the digestive tract limited the supercooling ability. Glucose and glycerol were not synthesized in cold conditions. Mean TcH was low (c. −17 °C), some INA being present in hemolymph of fed animals. Intestinal content of starved individuals exhibited a mean Tc of c. −6 °C, decreasing to c. −12° after heating, suggesting the presence of organic INA.

Dates et versions

hal-00315881 , version 1 (01-09-2008)

Identifiants

Citer

Armelle Ansart, Pierre-Aymeric Aulne, Luc Madec, Philippe Vernon. Influence of temperature acclimation and gut content on the supercooling ability of the land snail Cornu aspersum. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 2008, 150 (1), pp.14-20. ⟨10.1016/j.cbpa.2008.02.013⟩. ⟨hal-00315881⟩
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