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Impact of wild fish faeces to deep sea dissolved organic carbon as revealed by laboratory incubations

文献类型： 外文期刊

作者： Zhu, Zhuo-Yi 1 ; Fang, Fu-Tao 1 ; Hossen, Shipan 2 ; Zhao, Yuan 4 ; Chen, Zuo-Zhi 5 ; Zeng, Cong 1 ; Zhou, Meng 1 ;

作者机构： 1.Shanghai Jiao Tong Univ, Sch Oceanog, Shanghai, Peoples R China

2.East China Normal Univ, State Key Lab Estuarine & Coastal Res, Shanghai, Peoples R China

3.Univ Chittagong, Dept Oceanog, Chattogram, Bangladesh

4.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Marine Ecol & Environm Sci, Qingdao, Peoples R China

5.Chinese Acad Fishery Sci CAFS, South China Sea Fisheries Res Inst, Guangzhou, Peoples R China

6.Minist Agr & Rural Affairs, Key Lab Sustainable Utilizat Opensea Fishery, Guangzhou, Peoples R China

关键词： DOM; Fish faeces; Incubation; Amino acids; Network analysis; South China sea

期刊名称：DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS （ 影响因子：2.4； 五年影响因子：3.1 ）

ISSN： 0967-0637

年卷期： 2023 年 200 卷

页码：

收录情况： SCI

摘要： Wild fish faeces play an important role in mediating marine organic carbon cycle, but the faeces released dissolved organic matter (DOM) and its potentials in contribution to refractory DOM is unclear. The mixed wild fish (including mesopelagic fish) faecal samples from the northern South China Sea were collected and incubated up to 75 days using the waters collected at 800 m depth of the same site, to reveal the stability of the faeces released DOM. Our result showed that the faeces had a good DOM-release potential and dissolved organic carbon (DOC) was up to 150 mu M in the first day and reached its maximum (172 mu M) on day 3, which was in comparison with the control group (DOC <70 mu M). In our incubations, the faecal samples contributed net DOC of 110 mu M, in which 42 mu M persisted till the end of the 75 days dark incubation. This meant the faeces-released DOC had a refractory fraction of 38% over the incubation. Total hydrolysable amino acids concentration significantly dropped, and amino acids molecular indicator (DI, AA C yield and D/L ratio) changes over the incubation indicated the fast transformation of DOM from labile to degraded stage. Network analysis was applied to the amino acids and our result showed that D-form amino acids were almost positively coupled with L-form amino acids. Glycine (in mol%) showed consistent accumulation along with DOM degradation. Also, glycine was at the key node position of the amino acids network, showing negative relation with all other amino acids enantiomers in both faeces group and control group. Our results proved that glycine had the potential in tracing the refractory fraction over the DOM degradation.

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