文献类型：期刊文献

英文题名：Effects of diel-cycling hypoxia and salinity on lipid metabolism and fatty acid composition of the oyster Crassostrea hongkongensis

作者：Gao, Yiming[1,2];Xie, Zhe[1,2];Qian, Jin[1,2];Tu, Zhihan[1,2];Yang, Chuangye[3];Deng, Yuewen[3];Xue, Yucai[4];Shang, Yueyong[1,2];Hu, Menghong[1,2];Wang, Youji[1,2]

机构：[1]Shanghai Ocean Univ, Minist Sci & Technol, Int Res Ctr Marine Biosci, Shanghai 201306, Peoples R China;[2]Shanghai Ocean Univ, Key Lab Explorat & Utilizat Aquat Genet Resources, Minist Educ, Shanghai 201306, Peoples R China;[3]Guangdong Ocean Univ, Fisheries Coll, Zhanjiang 524088, Peoples R China;[4]Shanghai Ocean Univ, Ctr Res Environm Ecol & Fish Nutr CREEFN, Minist Agr, Shanghai 201306, Peoples R China

年份：2023

卷号：191

外文期刊名：MARINE ENVIRONMENTAL RESEARCH

收录：SCI-EXPANDED(收录号：WOS:001069783600001)、、EI(收录号：20233314566129)、Scopus(收录号：2-s2.0-85167829976)、WOS

基金：This research was supported by the grants from the National Natural Science Foundation of China (42176144, 3201101951) and the Guangxi Key Laboratory of Beibu Gulf Marine Biodiversity Conservation, Beibu Gulf University (2023KA04).

语种：英文

外文关键词：Oyster; Salinity change; Diel-cycling hypoxia; Lipid metabolism; Fatty acids

外文摘要：For marine animals living in estuarine, coastal, and intertidal areas, salinity changes and periodic hypoxia are typical stressors; however, how the varying salinity and dissolved oxygen affect the quality and nutrition of marine aquaculture species, such as oysters remains unknown. In this study, we evaluated the diel-cycling hypoxia under different salinities on fatty acid composition and lipid metabolism in oyster Crassostrea hongkongensis digestive glands. After 28 days of exposure, both hypoxia and elevated salinity caused a decrease in the saturated fatty acid (SFA)/polyunsaturated fatty acid (PUFA) ratio of C. hongkongensis, salinity mainly causes changes in C17:0, C17:1, C18:1n9, C20:1n9, C20:4n6, C21:5n3, C22:5n3, with high salinity being more damaging to the fatty acid fractions. Also, Hypoxia accelerates the synthesis of C18:1n9 and C20:4n6. Fatty acid synthase (FAS) synthesis is increased by reduced salinity or hypoxia, but Acetyl CoA carboxylase (ACC) only weakly promotes fatty acid synthesis. Under hypoxic conditions, the activity of both hepatic lipase (HL) and lipoprotein lipase activity (LPL) decreases, which is contrary to the results for dissolved oxygen. The increase in salinity under dissolved oxygen leads to a decrease in LPL activity and an increase in HL activity. Our findings highlighted that exposure to a combination of salinity and hypoxia stressors, can disrupt the protective mechanisms of the oyster and affect the function of its lipid metabolism. Therefore, long-term exposure to periodic hypoxia with salinity changes poses a risk to the nutritional quality of C. hongkongensis, affecting oyster aqua-culture and the coastal ecosystem.