Amino acid biogeochemistry and bacterial contribution to sediment organic matter along the western margin of the Bay of Bengal |
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| Institution: | 1. Key Laboratory of Marine Chemistry Theory and Technology, Ocean University of China, Ministry of Education/Qingdao Collaborative Innovation Center of Marine Science and Technology, Qingdao 266100, China;2. Laboratory of Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, China;3. College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China;4. Institute of Marine Chemistry, Ocean University of China, Qingdao 266100, China;1. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China;2. College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China;3. National Marine Hazard Mitigation Service, Beijing 100194, China;1. Colorado School of Mines, Golden, CO, USA;2. U.S. Geological Survey, Denver Federal Center, Denver, CO, USA;3. Indiana University – Purdue University Indianapolis, Indianapolis, IN, USA;1. Key Laboratory of Marine Chemistry Theory and Technology, Ocean University of China, Ministry of Education/Qingdao Collaborative Innovation Center of Marine Science and Technology, Qingdao 266100, China;2. Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China;3. Institute of Marine Chemistry, Ocean University of China, Qingdao 266100, China |
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| Abstract: | Six sediment cores collected from various water depths and sampling locations along the western margin of the Bay of Bengal (BOB) were investigated for the total hydrolysable amino acids (THAA) and d-amino acids (d-AA) to understand their distribution, digenetic alteration and bacterial contribution to organic matter (OM). Irrespective of their location, THAA concentrations and yields generally decreased and mol% glycine increased with increasing water depth indicating that OM was degraded during its transit through the water column. Amino acid based degradation index (DI) indicated that OM of the surface sediments of shallow stations, BOB-1 to BOB-3 was relatively fresher than that of deeper stations, BOB-4, BOB-5 and BOB-6. The concentrations and mol% of the d-AA varied from 0.04 to 0.76 µmol gdw?1 and 0.3 to 8.5 mol%, respectively. Contribution of bacterial peptidoglycan amino acids to THAA (% THAApep/THAA) ranged between 4.0% and 55.0%. Both % THAApep/THAA and mol% d-AAs were significantly (p<0.01) higher in the surface sediments and decreased with sediment core depth. Based on the d-AA yields, bacterial OM accounted for 1.5–15.6% of TOC, and 3.7–50.0% of TN of the sediments of BOB. |
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| Keywords: | Sediment THAA Bacteria Degradation Peptidoglycan Bay of Bengal |
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