The thermal stress response to diel vertical migration in the hyperiid amphipod Phronima sedentaria
The thermal stress response to diel vertical migration in the hyperiid amphipod Phronima sedentaria
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DOI：
10.1016/j.cbpa.2015.04.008
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发表时间：
2015-09-01
影响因子：
2.3
通讯作者：
Seibel, Brad A.
中科院分区：
文献类型：
--
作者：
Elder, Leanne E.;Seibel, Brad A.
超类片足类动物 Phronima sedentaria 在东部热带北太平洋 (ETNP) 的昼间迁徙过程中经历 15 摄氏度的温度变化，从深度的 8-10 摄氏度到夜间表层水域的 25-27 摄氏度。本研究的目的是确定 P.sedentaria 经历的自然温度梯度是否会导致热应激反应。个体最初暴露在夜间温度（23 摄氏度）下，随后暴露在他们通常经历的范围内或以上的温度下。在热带北太平洋东部热带地区，久坐的 P. sedentaria 可以忍受正常的夜间温度（类似于 23 摄氏度），但仅限于其停留期间（类似于 9 小时）。较长时间的暴露（24 小时）会导致热休克蛋白 (hsp) 表达升高。 29 摄氏度会导致 hsp 表达、乳酸产量增加，并且在所有暴露时间下死亡率为 50%。这代表上临界温度。了解远洋片脚类动物对当前环境的适应将有助于预测全球变暖对片脚类动物及其捕食者的生理影响。 (C) 2015 Elsevier Inc. 保留所有权利。
The hyperiid amphipod Phronima sedentaria experiences a temperature change of 15 degrees C during diel migration in the Eastern Tropical North Pacific (ETNP) from 8-10 degrees C at depth to 25-27 degrees C at night in the surface waters. The aim of this study was to determine if the natural temperature gradient experienced by P. sedentaria results in a thermal stress response. Individuals were initially exposed to their night time temperatures (23 degrees C) and subsequently subjected to temperatures within and above the range they typically experience. In the Eastern Tropical North Pacific P. sedentaria tolerates its normal night-time temperature (similar to 23 degrees C), but only for the duration of its stay there (similar to 9 h). Longer exposures (24 h) result in elevated heat shock protein (hsp) expression. 29 degrees C results in hsp expression, increased lactate production and 50% mortality at all exposure durations. This represents an upper critical temperature. Understanding the adaptations of pelagic amphipods to their current environment will help predict the physiological impacts of global warming for amphipods and their predators. (C) 2015 Elsevier Inc. All rights reserved.