文献类型：期刊文献

英文题名：Assessing the impact of atmospheric heatwaves on intertidal clams

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

年份：2022

卷号：841

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：SCI-EXPANDED(收录号：WOS:000817046600015)、、EI(收录号：20222612269402)、Scopus(收录号：2-s2.0-85132538067)、WOS

基金：The present study has been made possible by research grants from the Sci-ence and Technology Program of Guangdong Province (2021B0202020003) , the National Science Foundation of China (42076121, M-0163) , the Department of Education of Guangdong Province (2020KTSCX050) , the Guangxi Innovation Driven Development Special Fund (AA19254032) , and the Earmarked Fund for Modern Agro-industry Technology Research System (CARS-49) .

语种：英文

外文关键词：Global warming; Extreme climatic events; Physiological responses; Energy homeostasis; Ruditapes philippinarum

外文摘要：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.