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HE Yunhong, SUN Chengjun, LI Wenjuan, YANG Gui-Peng, DING Haibing. Degradation of lipids in seasonal hypoxic seawater under different oxygen saturation[J]. HaiyangYuHuZhao, 2018, 36(5): 1570-1585

Degradation of lipids in seasonal hypoxic seawater under different oxygen saturation

HE Yunhong1, SUN Chengjun2,3, LI Wenjuan1, YANG Gui-Peng1,3,4,5, DING Haibing1,3,5
1 Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China;
2 Marine Ecology Center, the First Institute of Oceanography, State Oceanic Administration(SOA), Qingdao 266061, China;
3 Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China;
4 College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China;
5 Qingdao Collaborative Innovation Center of Marine Science and Technology, Ocean University of China, Qingdao 266100, China
The hypoxic phenomena of seawater have been found in the Changjiang esturay and its adjacent area for several decades. To study organic matter degradation in seasonal hypoxic seawater, series of stimulated incubation experiments with Skeletonema costatum in seawater under different oxygen saturations were conducted. By tracking variations of lipids originated from the alga, time-dependent concentrations of neutral lipids (hexadecanol, otctadecanol, cholesterol, brassicasterol and phytol) and fatty acids (12:0, 14:0, 16:0, 16:1, 18:0, 18:1(9), 20:5 and 22:6) were obtained during three month of incubation. The results indicate that residence time, oxygen saturation, bacterial community and the structure of lipids were key factors controlling preservation and degradation of lipids in seawater. The degradation rate constants calculated from multi-G model showed that under same oxygen saturation, algal fatty acid degraded faster than neutral lipids, and unsaturated fatty acids degraded faster than saturated fatty acids. Our new discovery showed that degradation rate constant had linear positive correlation with oxygen saturation of seawater, indicating the critical role of oxygen on degradation of algal lipids in hypoxic seawater. The results of this study will be helpful to understand organic carbon cycling in seawater and marine environment more deeply. Future field experiments and investigation should be conducted tracking control factors, especially the role of oxygen saturation on organic matter degradation in natural environment.
Key words:    organic matter degradation|seasonal hypoxia|lipids|fatty acids|the Changjiang River estuary   
Received: 2017-04-07   Revised:
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