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First published online August 17, 2007
Journal of Experimental Biology 210, 3068-3074 (2007)
Published by The Company of Biologists 2007
doi: 10.1242/jeb.003137
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Antarctic fish can compensate for rising temperatures: thermal acclimation of cardiac performance in Pagothenia borchgrevinki

Craig E. Franklin1,*, William Davison2 and Frank Seebacher3

1 School of Integrative Biology, The University of Queensland, Brisbane, QLD 4072, Australia
2 School of Biological Sciences, The University of Canterbury, Christchurch, New Zealand
3 School of Biological Sciences, The University of Sydney, Sydney, NSW 2001, Australia


Figure 1
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  		Fig. 1. The effect of 5 min exercise on cardiac output at –1°C (A), 4°C (B) and 8°C (C) in Pagothenia borchgrevinki acclimated to –1°C and 4°C for 4–5 weeks. There was a significant increase in cardiac output at all temperatures for both acclimation groups. Values are means ± s.e.m. (N=8). *Significant difference in cardiac output from resting levels (time=0 min) for –1°C acclimated fish; {dagger}significant difference in cardiac output from resting levels (time=0 min) for 4°C acclimated fish.

 

Figure 2
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  		Fig. 2. The effect of an acute increase in temperature on resting and maximum cardiac output (ml min–1 kg–1 body mass) in Pagothenia borchgrevinki acclimated to –1°C (A) and 4°C (B). Values are means ± s.e.m. (N=8).

 

Figure 3
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  		Fig. 3. The effect of an acute increase in temperature on heart rate (beats min–1) at rest and during maximum cardiac output in Pagothenia borchgrevinki acclimated to –1°C (A) and 4°C (B). Values are means ± s.e.m. (N=8).

 

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  		Fig. 4. The effect of an acute increase in temperature on stroke volume (ml kg–1 body mass) at rest and during maximum cardiac output in Pagothenia borchgrevinki acclimated to –1°C (A) and 4°C (B). Values are means ± s.e.m. (N=8).

 

Figure 5
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  		Fig. 5. Effect of acclimation temperature in Pagothenia borchgrevinki on factorial scope for (A) cardiac output, (B) heart rate and (C) stroke volume. Factorial scope was calculated as maximum level during exercise divided by resting level. Values are means ± s.e.m. (N=8).

 




© The Company of Biologists Ltd 2007