Ravaux Juliette, Gaill Françoise, Le Bris Nadine, Sarradin Pierre-Marie, Jollivet Didier, Shillito Bruce
UMR CNRS 7138 Systématique, Adaptation et Evolution, Université Pierre et Marie Curie, 7 Quai St-Bernard, Batiment A, 75252 Paris Cedex 05, France.
J Exp Biol. 2003 Jul;206(Pt 14):2345-54. doi: 10.1242/jeb.00419.
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 degrees 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 degrees 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 degrees C. The R. exoculata optimal thermal habitat may thus be restricted to values lower than previously expected (<25 degrees C).
在大西洋中脊沿线的大多数热液喷口处，虾类“长眼柄糠虾”（Rimicaris exoculata）聚集在热液黑烟柱烟囱周围。该物种与热液流体保持着密切接触，热液流体温度可达350摄氏度，且预计存在陡峭的热梯度和化学梯度。我们在加压水族箱中进行了体内实验，以确定长眼柄糠虾的热上限[临界热最大值（CT(max)）]，并研究该虾对热暴露应激反应的一些特征。这些实验表明，该虾无法耐受持续暴露于33 - 37摄氏度范围内的温度（CT(max)）。在长眼柄糠虾中鉴定出一种属于hsp70家族的热诱导应激蛋白，其合成阈值诱导温度低于25摄氏度。因此，长眼柄糠虾的最佳热栖息地可能局限于比先前预期更低的值（<25摄氏度）。
