Journal
POLAR BIOLOGY
Volume 29, Issue 11, Pages 971-977Publisher
SPRINGER
DOI: 10.1007/s00300-006-0139-0
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The thermal sensitivity of scope for activity was studied in the Antarctic nototheniid fish Pagothenia borchgrevinki. The scope for activity of P. borchgrevinki at 0 degrees C was 189 mg O-2 kg(-1) h(-1) (factorial scope 6.8) which is similar to that of temperate and tropical species at their environmental temperatures, providing no evidence for metabolic cold adaptation of maximum activity. The scope for activity increased to a maximum value of 266 mg O-2 kg(-1) h(-1) (factorial scope 8.3) at 3 degrees C and then decreased from 3 to 6 degrees C. The thermal sensitivity of critical swimming speed was also investigated and followed a similar pattern to aerobic scope for activity, suggesting oxygen limitation of aerobic performance. Oxygen consumption rates and ventilation frequencies were monitored for 24 h after the swimming challenge and the recovery of both parameters to resting levels was rapid and independent of temperature.
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