Temperature resistance of Hesiolyra bergi, a polychaetous annelid living on deep-sea vent smoker walls

Shillito, B.; Jollivet, D.; Sarradin, P.-M.; Rodier, Ph.; Lallier, F.; Desbruyères, D.; Gaill, F.

doi:/10.3354/meps216141

Temperature resistance of Hesiolyra bergi, a polychaetous annelid living on deep-sea vent smoker walls

Shillito, B.; Jollivet, D.; Sarradin, P.-M.; Rodier, Ph.; Lallier, F.; Desbruyères, D.; Gaill, F. (2001). Temperature resistance of Hesiolyra bergi, a polychaetous annelid living on deep-sea vent smoker walls. Mar. Ecol. Prog. Ser. 216: 141-149. https://dx.doi.org/10.3354/meps216141

In: Marine Ecology Progress Series. Inter-Research: Oldendorf/Luhe. ISSN 0171-8630; e-ISSN 1616-1599, meer

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Shillito, B. Jollivet, D. Sarradin, P.-M. Rodier, Ph.	Lallier, F. Desbruyères, D., meer Gaill, F.

Abstract

For the first time, in vivo heat-exposure experiments were conducted on the hydrothermal vent polychaete Hesiolyra bergi from the hottest part of the vent biotope. Using a pressurised incubator equipped with video-facilities, we found that H. bergi, which forages around and in the tubes of the thermophilic Alvinella sp., became hyperactive once temperature exceeded 35°C and further lost co-ordination in the 41 to 46°C interval, just before death occurred. Another exposure experiment at 39°C for 3 to 4 h led to 80% mortality (max) 9 h after heat shock, and 100% thereafter. In view of the much higher temperatures recorded in this organism’s habitat, these results suggest that tolerance to high temperatures (exceeding 40°C) is not a pre-requisite for life amongst alvinellid tubes. Behavioural responses (escape from heat) may suffice.

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