CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China; Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China.
CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China; Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; University of Chinese Academy of Sciences, Beijing, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, China.
Mar Environ Res. 2022 Apr;176:105601. doi: 10.1016/j.marenvres.2022.105601. Epub 2022 Mar 15.
The blue mussel Mytilus edulis, which is a worldwide commercial species distributed mainly from the intertidal zone to tens of meters deep, has been previously studied regarding its acute defense responses to air exposure and intermittent hypoxia. However, the effects of sustained hypoxia, such as caused by coastal eutrophication, remain to be explored. In the present study, the critical threshold of dissolved oxygen (DO) for experimental mussels exposed to 16 days of hypoxia was DO 0.7-0.8 mg L, below which survival dropped drastically from nearly 80% to <38%. When hypoxia was combined with DO fluctuations or with poor water quality, the threshold rose to an average of DO 1.0 mg L, which resulted in less than 80% survival. To find possible clues of physiological stress to account for mortalities, the metabolic rate and enzyme activities of Na/K ATPase, superoxide dismutase, acid phosphatase, and alkaline phosphatase were further recorded.
贻贝（Mytilus edulis）是一种分布广泛的商业物种，主要分布在潮间带和数十米深的海域。之前的研究已经探讨了贻贝对空气暴露和间歇性缺氧的急性防御反应。然而，由于沿海富营养化等原因导致的持续低氧的影响仍有待探索。在本研究中，实验贻贝暴露于 16 天低氧的溶解氧（DO）临界阈值为 0.7-0.8mg/L，低于该阈值，存活率会从近 80%急剧下降到<38%。当低氧与 DO 波动或水质差相结合时，阈值会上升到平均 DO 1.0mg/L，此时存活率会低于 80%。为了寻找可能导致死亡的生理应激的线索，进一步记录了钠/钾 ATP 酶、超氧化物歧化酶、酸性磷酸酶和碱性磷酸酶的代谢率和酶活性。
