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Quantification of the carbon released by a marine fish using a carbon release model and radiocarbon

文献类型： 外文期刊

作者： Liu, Qingxia 1 ; Zhou, Linbin 1 ; Wu, Yun 4 ; Huang, Honghui 2 ; He, Xuejia 5 ; Gao, Na 1 ; Zhang, Li 1 ;

作者机构： 1.Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Trop Marine Bioresources & Ecol, Guangdong Prov Key Lab Appl Marine Biol, Guangzhou 510301, Peoples R China

2.Chinese Acad Fishery Sci, South China Sea Fisheries Res Inst, Guangdong Prov Key Lab Fishery Ecol & Environm, Guangzhou 510300, Peoples R China

3.Southern Marine Sci & Engn Guangdong Lab Guangzhou, Guangzhou 511458, Peoples R China

4.Nanjing Univ Informat Sci & Technol, Sch Environm Sci & Engn, Nanjing 210044, Peoples R China

5.Jinan Univ, Res Ctr Harmful Algae & Marine Biol, Guangzhou 510632, Peoples R China

6.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

7.State Ocean Adm, South China Sea Inst Planning & Environm Res, Guangzhou 510310, Peoples R China

关键词： Ocean carbon flux; Dissolved organic carbon; Marine medaka; Marine environment; Radiocarbon; Carbon release model

期刊名称：MARINE POLLUTION BULLETIN （ 影响因子：7.001； 五年影响因子：7.301 ）

ISSN： 0025-326X

年卷期： 2022 年 181 卷

页码：

收录情况： SCI

摘要： Here we propose a carbon release model that divides fish-released carbon into two sources (ingested food and the fish body), and three forms (dissolved organic carbon (DOC), CO2, and particulate carbon (PC)). We quantified the daily carbon budget of a marine fish Oryzias melastigma by feeding the fish radiocarbon-labeled living rotifer. We found that 91%-92%, 25%-47%, 28%-50%, 20%-31%, and 8%-9% of the ingested food carbon was absorbed, assimilated, and released as DOC, CO2, and PC, respectively. Fish body carbon dissimilated/catabolized and released as 0.053-0.12 d(-1) at two daily food rations. DOC, CO2, and PC accounted for 39%-42%, 39%-45%, and 16%-19% of the released fish body carbon, respectively. Our study shows that the fish transformed substantial fractions of their daily ingested food and dissimilated body carbon into DOC, and fish may be an important source of DOC in the ocean.

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