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冰下的热浪:在南极的石鱼中,器官特异性的生理反应,Trematomus bernacchii (Boulenger,1902)
Elisabetta Piva1, Shaghayegh Kholdihaghighi2, Alessia Ametrano3
1Department of Biology, University of Padova, Padova, Italy.
概括
海洋热浪给南极鱼造成压力. 肝脏对温和的热量反应较早,而脏对强烈的热量反应较晚,表明生理可塑性有限,易受气候变化的影响.
科学领域:
- 海洋生物学 海洋生物学
- 生态生态学 生态生态学
- 气候变化科学 气候变化科学
背景情况:
- 海洋生态系统面临着气温上升和海洋热浪 (MHWs) 的日益严重威胁.
- 南洋和南极地区是气候驱动生物多样性变化的敏感指标.
- 南极鱼类生理学可能表现出有限的可塑性,以应对热应激.
研究的目的:
- 为了研究南极鱼Trematomus bernacchii对模拟海洋热浪的转录反应.
- 分析肝脏和脏组织中的基因表达,专注于抗氧化剂和天生的免疫基因.
- 了解极地鱼的热应激背后的分子机制.
主要方法:
- 成人Trematomus bernacchii标本是从罗斯海收集的.
- 鱼类暴露在模仿MHWs的温度梯度 (0°C至+3°C) 中.
- 在肝脏和脏组织中分析了抗氧化剂 (prdx3,prdx5,cat,sod1,sod2,gpx1,gpx3,gpx4) 和先天免疫 (tlr2,tlr9) 基因的基因表达水平.
主要成果:
- 肝脏表现出早期的动态反应,基因在+1°C和+2°C上调,随后在+3°C下调.
- 脏表现出延迟反应,只有在+3°C时才有显著的基因激活.
- 催化酶 (猫) 基因在所有条件下对热应激没有反应.
结论:
- 肝脏和脏对热应激有不同的反应,这表明了不同的调节机制和节能策略.
- 这些发现凸显了极地鱼类有限的生理可塑性,强调了它们对预计气候变化的脆弱性.
- 这项研究提供了关于海洋变暖对南极海洋生物多样性影响的分子见解.
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