期刊
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
卷 288, 期 1946, 页码 -出版社
ROYAL SOC
DOI: 10.1098/rspb.2020.2340
关键词
cardiac function; hypoxia; thermal tolerance; temperature; haematology; climate change
资金
- NSERC Discovery Grant [2016-0448]
- Ocean Frontier Institute from the Canada First Research Excellence Fund
- Memorial University of Newfoundland, School of Graduate Studies, fellowship
Research suggests that hypoxia may impair fish cardiac and metabolic responses to increased temperatures, potentially making coastal species more vulnerable to climate change-related heat waves than previously thought. Moreover, the limited cross-tolerance and physiological plasticity in fish following hypoxia acclimation highlight the need for further study in this area.
Studies of heart function and metabolism have been used to predict the impact of global warming on fish survival and distribution, and their susceptibility to acute and chronic temperature increases. Yet, despite the fact that hypoxia and high temperatures often co-occur, only one study has examined the effects of hypoxia on fish thermal tolerance, and the consequences of hypoxia for fish cardiac responses to acute warming have not been investigated. We report that sablefish (Anoplopoma fimbria) did not increase heart rate or cardiac output when warmed while hypoxic, and that this response was associated with reductions in maximum O-2 consumption and thermal tolerance (CTmax) of 66% and approximately 3 degrees C, respectively. Further, acclimation to hypoxia for four to six months did not substantially alter the sablefish's temperature-dependent physiological responses or improve its CTmax. These results provide novel, and compelling, evidence that hypoxia can impair the cardiac and metabolic response to increased temperatures in fish, and suggest that some coastal species may be more vulnerable to climate change-related heat waves than previously thought. Further, they support research showing that cross-tolerance and physiological plasticity in fish following hypoxia acclimation are limited.
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