Assessing the impact of atmospheric heatwaves on intertidal clams

被引:36
作者
He, Guixiang [1 ]
Zou, Jie [2 ]
Liu, Xiaolong [1 ]
Liang, Feilong [1 ]
Liang, Jian [1 ,4 ]
Yang, Ke [1 ]
Masanja, Fortunatus [1 ]
Xu, Yang [1 ]
Zheng, Zhe [1 ]
Deng, Yuewen [1 ,3 ]
Zhao, Liqiang [1 ]
机构
[1] Guangdong Ocean Univ, Fisheries Coll, Zhanjiang, Peoples R China
[2] Guangxi Acad Sci Ltd, Guangxi Inst Oceanol Co, Beihai, Peoples R China
[3] Guangdong Prov Lab Marine Ecol Early Warning & Mon, Zhanjiang, Peoples R China
[4] Tianjin Agr Univ, Dept Fisheries, Tianjin, Peoples R China
基金
美国国家科学基金会;
关键词
Global warming; Extreme climatic events; Physiological responses; Energy homeostasis; Ruditapes philippinarum; CLIMATE-CHANGE; RUDITAPES-PHILIPPINARUM; SEAWATER ACIDIFICATION; TOLERANCE; RESPONSES; BIODIVERSITY; CAPACITY; PATTERNS; LIMITS;
D O I
10.1016/j.scitotenv.2022.156744
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
bivalves and ecosystems they sustain. Intertidal clams inhabit the most physiologically challenging habitats in coastal areas and live already near their thermal tolerance limits. However, whether and to what extent atmospheric heatwaves affect intertidal bivalves remain poorly understood. Here, we investigated physiological responses of the Manila clam, Ruditapes philippinarum, to heatwaves at air temperature regimes of 40 degrees C and 50 degrees C occurring frequently and occasionally at the present day in the Beibu Gulf, South China Sea. With the increasing intensity of heatwaves and following only two days of aerial exposure, Manila clams suffered 100 % mortality at 50 degrees C, indicating that they succumb to near future heatwaves, although they survived under various scenarios of moderate heatwaves. The latter is couched in energetic terms across levels of biological organization. Specifically, Manila clams acutely exposed to heatwaves enhanced their standard metabolic rate to fuel essential physiological maintenance, such as increasing activities of SOD, CAT, MDA, and AKP, and expression of HSP70. These strategies occur likely at the expense of fitness-related functions, as best exemplified by significant depressions in activities of enzymes (NKA, CMA, and T-ATP) and expression levels of genes (PT, KHK, CA, CAS, TYR, TNF-BP, and OSER). When heatwaves occurred again, Manila clams can respond and acclimate to thermal stress by implementing a suite of more ATP-efficient and less energy-costly compensatory mechanisms at various levels of biological organization. It is consequently becoming imperative to uncover underlying mechanisms responsible for such positive response and rapid acclimation to recurrent heatwaves.
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页数:10
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