Liu Xiaolong, Peng Yalan, Xu Yang, He Guixiang, Liang Jian, Masanja Fortunatus, Yang Ke, Xu Xin, Deng Yuewen, Zhao Liqiang
Fisheries College, Guangdong Ocean University, Zhanjiang, China.
Zhuhai Central Station of Marine Environmental Monitoring, Ministry of Natural Resources, Zhuhai, China.
Mar Pollut Bull. 2023 Jan;186:114395. doi: 10.1016/j.marpolbul.2022.114395. Epub 2022 Nov 28.
Marine heatwaves (MHWs) have increased in intensity and frequency in global oceans, causing deleterious effects on many marine organisms and ecosystems they support. Bivalves are among the most vulnerable taxonomic groups to intensifying MHWs, yet little is known about the underlying mechanisms. Here, we investigated the impact of MHWs on the digestive metabolism of pearl oysters (Pinctada maxima). Two moderate and severe scenarios of MHWs were performed by increasing seawater temperature respectively from 24 °C to 28 °C and 32 °C for 3 days. When subjected to MHWs and with increasing intensity, pearl oysters significantly enhanced their digestive enzymatic activities, such as lipase and amylase. LC-MS-based metabolomics revealed negative responses in the lipid metabolism (e.g., steroid biosynthesis, glycerophospholipid metabolism, and sphingolipid metabolism), the amino acid metabolism (e.g., glutamate, histidine, arginine, and proline), and the B-vitamins metabolism. These findings indicate that the digestive metabolism of marine bivalves can likely succumb to intensifying MHWs events.
海洋热浪（MHWs）在全球海洋中的强度和频率不断增加，对许多海洋生物及其所支持的生态系统造成了有害影响。双壳类动物是受海洋热浪加剧影响最脆弱的分类群体之一，但对其潜在机制却知之甚少。在此，我们研究了海洋热浪对珍珠贝（Pinctada maxima）消化代谢的影响。通过将海水温度分别从24°C升高到28°C和32°C持续3天，模拟了两种中度和重度海洋热浪情景。当遭受海洋热浪且强度增加时，珍珠贝显著提高了其消化酶活性，如脂肪酶和淀粉酶。基于液相色谱 - 质谱联用的代谢组学分析揭示了脂质代谢（如类固醇生物合成、甘油磷脂代谢和鞘脂代谢）、氨基酸代谢（如谷氨酸、组氨酸、精氨酸和脯氨酸）以及B族维生素代谢的负面反应。这些发现表明，海洋双壳类动物的消化代谢可能会受到不断加剧的海洋热浪事件的影响。
