期刊
JOURNAL OF EXPERIMENTAL BIOLOGY
卷 211, 期 24, 页码 3915-3926出版社
COMPANY BIOLOGISTS LTD
DOI: 10.1242/jeb.019281
关键词
Pacific salmon; cardiac output; heart rate; oxygen consumption; respiration; temperature
类别
资金
- Carlsberg Foundation
- Natural Sciences and Engineering Research Council of Canada
The mechanism underlying the decrease in aerobic scope in fish at warm temperatures is not fully understood and is the focus of this research. Our study examined oxygen uptake and delivery in resting, swimming and recovering sockeye salmon while water temperature was acutely increased from 15 degrees C to 24 degrees C in 2 Ch(-1) increments. Fish swam at a constant speed during the temperature change. By simultaneously measuring oxygen consumption ((M) over dot (O2)), cardiac output ((Q) over dot) and the blood oxygen status of arterial and venous blood, we were able to determine where in the oxygen cascade a limitation appeared when fish stopped sustained swimming as temperature increased. High temperature fatigue of swimming sockeye salmon was not a result of a failure of either oxygen delivery to the gills or oxygen diffusion at the gills because oxygen partial pressure (P-O2) and oxygen content (C-O2) in arterial blood did not decrease with increasing temperature, as would be predicted for such limitations. Instead, arterial oxygen delivery (Ta-O2) was initially hampered due to a failure to adequately increase (Q) over dot with increasing temperature. Subsequently, lactate appeared in the blood and venous P-O2 remained constant.
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