期刊
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
卷 71, 期 7, 页码 1096-1105出版社
CANADIAN SCIENCE PUBLISHING
DOI: 10.1139/cjfas-2013-0569
关键词
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资金
- Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery Grant
- NSERC Discovery Accelerator Supplement
- Biology Department (Memorial University of Newfoundland)
In this first study examining the thermal tolerance of adult Arctic char (Salvelinus alpinus) acclimated to seawater, we measured their critical thermal maximum (CTMax) and several cardiorespiratory parameters (oxygen consumption (MO2), heart rate (f(H)), stroke volume (S-V), cardiac output (Q), ventilatory frequency (V-F), opercular pressure (P-O), and ventilatory effort (V-E)) when exposed to a temperature increase of 2 degrees C h(-1). Further, we directly compared these results with those obtained for the eurythermal Atlantic salmon (Salmo salar) under identical conditions. There was no significant difference in cardiorespiratory values between the two species at their acclimation temperature (9.5-10 degrees C). In contrast, the slope of the MO2-temperature relationship was lower (by 27%) in the char as compared with that in the salmon, and the char had significantly lower values for maximum f(H) (by 13%), maximum MO2 (by 35%), absolute metabolic scope (by 39%), and CTMax (approximately 23 versus 26.5 degrees C, respectively). Although not a focus of the study, preliminary data suggest that interspecific differences in mitochondrial respiration (oxidative phosphorylation), and its temperature sensitivity, may partially explain the difference in thermal tolerance between the two species. These results provide considerable insights into why Atlantic salmon are displacing Arctic char in the current era of accelerated climate change.
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