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Lasting impacts of rapid salinity change on physiological energetics of estuarine oysters (Crassostrea hongkongensis)

文献类型： 外文期刊

作者： Yao, Tuo 1 ; Masanja, Fortunatus 1 ; Lu, Jie 1 ; Fu, Shengli 1 ; Luo, Wenfan 6 ; Shija, Vicent Michael 5 ; Ye, Lingtong 1 ; Zhao, Liqiang 5 ;

作者机构： 1.Chinese Acad Fishery Sci, South China Sea Fisheries Res Inst, Key Lab South China Sea Fishery Resources Exploita, Minist Agr & Rural Affairs, Guangzhou, Peoples R China

2.Sanya Trop Fisheries Res Inst, Sanya, Peoples R China

3.Chinese Acad Fishery Sci, South China Sea Fisheries Res Inst, Trop Aquaculture Res & Dev Ctr, Sanya, Peoples R China

4.Chinese Acad Fishery Sci, Shenzhen Base South China Sea Fisheries Res Inst, Shenzhen, Peoples R China

5.Guangdong Ocean Univ, Fisheries Coll, Zhanjiang, Peoples R China

6.Agrotech Extens Ctr Guangdong Prov, Guangzhou, Peoples R China

7.Oyster Ind Technol Inst Zhanjiang, Southern Marine Sci & Engn Guangdong Lab Zhanjiang, Zhanjiang, Peoples R China

关键词： Estuary; Hypersalinization; Desalinization; Bivalves; Survival; Bioenergetics; Stress tolerance

期刊名称：MARINE ENVIRONMENTAL RESEARCH （ 影响因子：3.2； 五年影响因子：3.3 ）

ISSN： 0141-1136

年卷期： 2025 年 207 卷

页码：

收录情况： SCI

摘要： The duration of rapid salinity change (RSC) prevailing in estuarine and coastal regions is increasing due to extreme climate and weather events, posing significant challenges to marine bivalves. The Hong Kong oyster (Crassostrea hongkongensis), an ecologically and economically important species in tropical estuarine ecosystems, has experienced increasing mass mortality during prolonged periods of RSC, yet little is known about underlying physiological processes. Here, we investigated how physiological energetics of C. hongkongensis were affected by longer-lasting scenarios and four-week episodes of RSC. Compared with ambient conditions with seawater salinity ranging from 15 to 20, rapid salinity change by +/- 10 units significantly decreased the survival of oysters, with RSC-induced hyposaline stress (-10) resulting in more serious consequences than that of hypersaline regime (+10). Continuing exposure of oysters to both RSC scenarios significantly affected their feeding activities, but the food absorption efficiency were still virtually unchanged. Significantly depressed respiration and increased excretion activities were observed in RSC-stressed oysters, resulting in significantly lowered O:N ratio. Overall, when exposed to RSC, oysters showed significantly decreased scope for growth, due to shifts in energy budget toward maintenance of essential physiological processes. Our results demonstrate the vulnerability of estuarine oysters to prolonged RSC events, and underscore the pressing need to develop strategies to enhance oyster tolerance under intensifying RSC conditions and safeguard oyster aquaculture in this era of unprecedented climate change.

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