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The Journal of Experimental Biology 206, 2345-2354 (2003)
doi: 10.1242/jeb.00419

Heat-shock response and temperature resistance in the deep-sea vent shrimp Rimicaris exoculata

Juliette Ravaux¹, Françoise Gaill¹, Nadine Le Bris², Pierre-Marie Sarradin², Didier Jollivet³ and Bruce Shillito^1,*

¹ UMR CNRS 7138 `Systématique, Adaptation et Evolution', Université Pierre et Marie Curie, 7 Quai St-Bernard, Batiment A, 75252 Paris Cedex 05, France
<sup>2</sup> Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Centre de Brest, DRO-EP, bp 70, 29280 Plouzané, France
<sup>3</sup> Station Marine de Roscoff, UPR CNRS 9042, Equipe `Evolution et génétique des populations marines', bp 74, 29682 Roscoff Cedex, France

^* Author for correspondence (e-mail: bruce.shillito{at}snv.jussieu.fr)

Accepted 31 March 2003

The shrimp Rimicaris exoculata swarms around hydrothermal black smoker chimneys at most vent sites along the Mid-Atlantic Ridge. This species maintains close proximity to the hydrothermal fluid, where temperatures can reach 350°C and steep thermal and chemical gradients are expected. We performed in vivo experiments in pressurized aquaria to determine the upper thermal limit [critical thermal maximum (CT_max)] of R. exoculata and to investigate some characteristics of the shrimp stress response to heat exposure. These experiments showed that the shrimp does not tolerate sustained exposure to temperatures in the 33-37°C range (CT_max). A heat-inducible stress protein belonging to the hsp70 family was identified in R. exoculata, and its synthesis threshold induction temperature is below 25°C. The R. exoculata optimal thermal habitat may thus be restricted to values lower than previously expected (<25°C).

Key words: hydrothermal vent, thermal stress, Crustacea, Caridae, IPOCAMP, chaperone, Rimicaris exoculata, shrimp, heat shock

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