Vertical variations and composition of dissolved free amino acid in the seawater of the Yap Trench in the western Pacific Ocean

Jiaohong NIU; Chengjun SUN; Bo YANG; Lei XIE; Fenghua JIANG; Wei CAO; Yan CHEN; Haibing DING; Yuhuan HUANG; Xianchi GAO

doi:10.1007/s00343-022-0190-x

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Vertical variations and composition of dissolved free amino acid in the seawater of the Yap Trench in the western Pacific Ocean

Chemistry | Updated：2023-04-27

- Vertical variations and composition of dissolved free amino acid in the seawater of the Yap Trench in the western Pacific Ocean
- Journal of Oceanology and Limnology Vol. 41, Issue 1, Pages: 118-137(2023)
- Affiliations：
  
  1.Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China
  2.Marine Ecology and Environmental Science Laboratory, Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266237, China
  3.Marine Ecology Center, the First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
  4.Qingdao No. 2 Middle School, Qingdao 266100, China
  5.College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China
  6.Qingdao Collaborative Innovation Center of Marine Science and Technology, Ocean University of China, Qingdao 266100, China
- Author bio：
  
  Yuhuan HUANG, E-mail: hyh1299@163.com
  Xianchi GAO, E-mail: gaoxch@ouc.edu.cn
- Funds：
- DOI：10.1007/s00343-022-0190-x
  CLC：
- Received：10 May 2020，
  
  Accepted：28 June 2020，
  
  Online First：06 January 2022，
  
  Published：2023-01
- Accepted：
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Jiaohong NIU, Chengjun SUN, Bo YANG, et al. Vertical variations and composition of dissolved free amino acid in the seawater of the Yap Trench in the western Pacific Ocean[J]. Journal of Oceanology and Limnology, 2023, 41(1): 118-137.
DOI：

Jiaohong NIU, Chengjun SUN, Bo YANG, et al. Vertical variations and composition of dissolved free amino acid in the seawater of the Yap Trench in the western Pacific Ocean[J]. Journal of Oceanology and Limnology, 2023, 41(1): 118-137. DOI： 10.1007/s00343-022-0190-x.

摘要

Abstract

The composition and concentration of dissolved free amino acid (DFAA) of seawater samples collected in May 2016 from the surface to the hadal zone of the northern region of the Yap Trench were analyzed by pre-column derivatization of o-phthalaldehyde. Results show that the average concentration of DFAA in the study area was 0.47±0.36 μmol/L. In different sampling stations

the concentrations of DFAA with water depth showed complex variation patterns. At the sediment-seawater interface

the concentrations of DFAA in the western side of the trench were obviously higher than that in its eastern side. In the study area

there were no significant correlations between the concentrations of DFAA and the environmental parameters such as concentrations of chlorophyll

(Chl

)

dissolved oxygen (DO)

and dissolved inorganic nitrogen (DIN)

indicating that the concentrations of DFAA in seawater of the trench are affected by many factors

such as photosynthesis

respiration

temperature

pressure

illumination

and circulation. The dominant DFAA are similar in different water layers of sampling stations

including aspartic acid (Asp)

glutamic acid (Glu)

glycine (Gly)

and serine (Ser). The composition of different amino acids

and the relative abundance of acidic

basic

and neutral amino acids might be related to the sources and consumption of various amino acids. Nine pairs of amino acids in the DFAA showed significantly positive relationship by correlation matrix analysis

suggesting that they might share similar biogeochemical processes. The degradation index (DI) of the DFAA in seawater of the Yap Trench could reflect the degradation

source

and freshness of DFAA in the trench to some extents. This is a preliminary study of amino acids from sea surface to hadal zone in the ocean

more works shall be done in different trenches to reveal their biogeochemical characteristics in extreme marine environments.

关键词

Keywords

references

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Qingdao Collaborative Innovation Center of Marine Science and Technology

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