鱼对反复出现的海洋热浪的生理和生化反应
Ke Yang1, Yang Xu1, Guixiang He1
1Fisheries College, Guangdong Ocean University, Zhanjiang, China.
Marine environmental research
|July 24, 2023
概括
马尼拉贝对海洋热浪 (MHWs) 具有弹性,激活补偿机制,并表现出对热应激的生理和分子适应. 这凸显了双鱼适应不断变化的海洋条件的潜力.
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 气候变化
背景情况:
- 海洋热浪 (MHW) 在南中国海的频率和强度正在增加.
- 潮间双鱼,包括生态和经济上重要的马尼拉 (Ruditapes philippinarum),易受MHW影响.
- 关于R. philippinarum对不断升级的MHW事件的适应能力的知识有限.
研究的目的:
- 为了研究Ruditapes philippinarum对模拟海洋热浪事件的生理和分子反应.
- 评估在不同热应力场景下马尼拉的生存率和补偿机制.
- 确定关键的基因和酶,涉及马尼拉的耐受性和适应性,以重复的MHWs.
主要方法:
- 将马尼拉暴露在两个连续的MHW场景中,温度增加4°C和8°C.
- 测量生存率和标准代谢率.
- 分析与能量代谢,抗氧化防御和生物矿物化的相关酶的活性.
- 量化与生理耐受性和健康相关的基因的表达.
主要成果:
- 在极端高温 (+8°C) 条件下,多达87%的马尼拉能够在重复性MHW中幸存下来,并且在极端高温 (+8°C) 条件下观察到更高的代谢率.
- 酶活性 (NKA,CMA,T-ATP,SOD,CAT,MDA,AKP,ACP) 显示出最初的增加,随后随着MHWs的加剧而下降.
- 特定的基因 (ATAD3A,PFK,SOD,C3) 显著下调,表明对MHWs的抗性.
结论:
- 马尼拉拥有补偿机制,以减轻MHWs的热应激.
- 生理和分子反应表明,海洋双生物对模拟的MHW事件具有一定程度的适应潜力.
- 这些发现有助于了解面对气候变化引起的海洋热浪时的双弹性.
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