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First published online February 15, 2006
Journal of Experimental Biology 209, 945-955 (2006)
Published by The Company of Biologists 2006
doi: 10.1242/jeb.02102

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Temperature resistance studies on the deep-sea vent shrimp Mirocaris fortunata

Bruce Shillito^1,*, Nadine Le Bris², Stéphane Hourdez³, Juliette Ravaux¹, Delphine Cottin¹, Jean-Claude Caprais², Didier Jollivet³ and Françoise Gaill¹

¹ UMR CNRS 7138 `Systématique, Adaptation et Evolution', Université Pierre et Marie Curie, 7 Quai St-Bernard, Batiment A, 75252 Paris Cedex 05, France
² Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Centre de Brest, DRO-EP, BP70, 29280 Plouzané, France
³ Station Marine de Roscoff, UPR CNRS 9042, BP74, 29682 Roscoff Cedex, France

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

Accepted 17 January 2006

The shrimp Mirocaris fortunata is a hydrothermal vent species that is found at most vent-sites along the Mid-Atlantic Ridge. This endemic species is found across a hydrothermal gradient, with thermal conditions ranging from 2–9°C in ambient seawater to fairly warm values of about 25°C. We performed in vivo experiments on M. fortunata specimens originating from different sites and depths (850 m to 2300 m), both at atmospheric pressure and in pressurized aquaria, to characterise the upper thermal limits of this species. Atmospheric pressure results show that thermal physiology should be studied at each population's native pressure. At in situ pressure, shrimps from Menez Gwen (850 m depth) and Lucky Strike (1700 m depth) do not survive temperatures of 39°C, and the `loss of equilibrium' response suggests that their critical thermal maximum (Ct_max), is about 36±1°C for both sites. This value is similar to those found for another vent shrimp, Rimicaris exoculata, which is thought to be a more temperature-resistant organism, so temperature resistance does not appear to be a crucial factor for explaining differences in distribution of shrimp species in a given vent site. Finally, the data for both vent shrimps are also comparable to those of other non-vent tropical caridean species.

Key words: hydrothermal vent, thermal stress, Mirocaris fortunata, Crustacea, IPOCAMP^TM

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