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Biogenic acidification of Portuguese oyster Magallana angulata mariculture can be mediated through introducing brown seaweed Sargassum hemiphyllum

文献类型： 外文期刊

作者： Han, Tingting 1 ; Shi, Rongjun 1 ; Qi, Zhanhui 1 ; Huang, Honghui 1 ; Wu, Fengxia 1 ; Gong, Xiuyu 1 ;

作者机构： 1.CAFS, Guangdong Prov Key Lab Fishery Ecol Environm, Key Lab South China Sea Fishery Resources Exploit, Minist Agr,South China Sea Fisheries Res Inst, Guangzhou 510300, Peoples R China

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

关键词： Portuguese oyster; Magallana angulata; Sargassum hemiphyllum; Daya bay; Dissolved inorganic carbon; Aquaculture

期刊名称：AQUACULTURE （ 影响因子：4.242； 五年影响因子：4.723 ）

ISSN： 0044-8486

年卷期： 2020 年 520 卷

页码：

收录情况： SCI

摘要： The physiological responses of aquaculture organisms (e.g., oyster and seaweed) have the potential to affect seawater carbon fluxes and subsequently are affected by these seawater changes. In this study, a laboratory experiment and a field mesocosm experiment were carried out in Daya Bay, southern China. In the laboratory experiment, Portuguese oyster Magallana angulata and the brown seaweed Sargassum hemiphyllum were mono cultured in 20-L transparent glass bottles for 24 h. Water sample were collected at four incubation time points (i.e. 0 h, 4 h, 12 h and 24 h) to examine their physiological responses across the incubation period. The results showed that the oyster calcification rate was not significantly changed among 4 h, 12 h and 24 h. On the other hand, during the 24 h incubation time, the oyster respiration rate, seawater pH, dissolved oxygen (DO), and CO32- concentration were significantly declined, but the seawater CO2 concentration was increased. For the seaweed, from 0 h to 12 h, seawater CO2 and HCO3- concentrations were significantly declined. However, the seawater pH and DO concentration were increased. In the field experiment, oyster and seaweed were cultured in mesocosm bags. The effects of different culture models of M. angulata and S. hemiphyllum (i.e. oyster monoculture, seaweed monoculture and oyster-seaweed co-culture) on seawater CO2-carbonate system and air-sea CO2 flux (F-CO2) were investigated after 24 h incubation. The results showed that DIC, HCO3- and CO2 concentrations and the partial pressure of CO2 in co-culture bags were significantly lower than the control bags (without any culture organisms) and oyster bags, indicated that S. hemiphyllum can effectively absorb the CO2 released by the oysters. The negative values of air-sea F-CO2 in the co-culture bags represent a CO2 sink from the atmosphere to the sea. These results demonstrated that aquaculture organism monoculture could result in a stress for itself, and there could be an interspecies mutual benefit for both M. angulata and S. hemiphyllum in the co-culture system. The negative environmental impacts of mono-trophic oyster aquaculture in this view could be mediated with the multi-trophic inclusion of seaweed.

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