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GUO Chaonan, SUN Chengjun, YANG Guipeng, ZHANG Honghai, CHEN Yan, YIN Xiaofei, JIANG Fenghua, HUANG Yuhuan, NIU Jiaohong, DING Haibing. Vertical variations of dissolved carbohydrates in the North Yap Trench[J]. Journal of Oceanology and Limnology, 2020, 38(3): 606-618

Vertical variations of dissolved carbohydrates in the North Yap Trench

GUO Chaonan1,3, SUN Chengjun2,4, YANG Guipeng1,3,4,5, ZHANG Honghai1,3,4, CHEN Yan3, YIN Xiaofei2, JIANG Fenghua2, HUANG Yuhuan1,3, NIU Jiaohong1,3, DING Haibing1,4,5
1 Key Laboratory of Marine Chemistry Theory and Technology Ministry of Education, Ocean University of China, Qingdao 266100, China;
2 Key Laboratory of Marine Eco-environmental Science and Technology, Marine Bioresource and Environment Research Center, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China;
3 College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China;
4 Marine Ecology and Environmental Science Laboratory, Pilot National Laboratory for Marine Science and Technology, Qingdao 266237, China;
5 Qingdao Collaborative Innovation Center of Marine Science and Technology, Qingdao 266100, China
The concentrations of dissolved monosaccharides (MCHO), polysaccharides (PCHO), and total carbohydrates (TCHO) in the seawater samples collected from the north of the Yap Trench in the western Pacific Ocean were measured by 2,4,6-tripyridine-s-triazine (TPTZ) spectrophotometry method. The results show that the concentrations of MCHO, PCHO, and TCHO ranged from 4.6 to 22.1 μmol C/L, 3.5 to 27.3 μmol C/L, and 13.8 to 36.3 μmol C/L, respectively. In different sampling stations, the concentrations of MCHO, PCHO, and TCHO with water depth showed complex variation patterns. In the study area, the maximum concentrations of MCHO, PCHO, and TCHO occurred in the euphotic layer and the minimum concentrations occurred in mesopelagic seawater layer. Generally, the concentrations of MCHO, PCHO, and TCHO decreased with water depth from the euphotic layer to the hadal zone. The average value of PCHO/ TCHO was higher than the average value of MCHO/TCHO, indicating that PCHO was the main component of TCHO in north of the Yap Trench.
Key words:    Yap Trench|abyss|hadal zone|monosaccharide|polysaccharide   
Received: 2019-01-21   Revised: 2019-08-15
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