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First published online January 30, 2009
Journal of Experimental Biology 212, 514-522 (2009)
Published by The Company of Biologists 2009
doi: 10.1242/jeb.024034
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Do mitochondrial properties explain intraspecific variation in thermal tolerance?

Nann A. Fangue1,2,*, Jeffrey G. Richards1 and Patricia M. Schulte1

1 Department of Zoology, University of British Columbia, 6270 University Boulevard, Vancouver, BC V6T 1Z4, Canada
2 Department of Ecology, Evolution and Marine Biology, University of California Santa Barbara, Santa Barbara, CA 93106, USA


Figure 1
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  		Fig. 1. Temperature dependence of State III (pmol O mg–1 mitochondrial protein min–1) respiration rates, determined in mitochondria from 5°C (A), 15°C (B) and 25°C (C) acclimated northern (filled triangles) and southern (open circles) killifish. Significant differences within a population and acclimation temperature are indicated with different letters. An asterisk (*) indicates a significant difference between populations within an acclimation temperature for a given assay temperature. A {dagger} indicates a significant difference between the 25°C acclimation group and the 5 and 15°C acclimation groups when assayed at the same temperature (indicated on 25°C acclimation data). Data are expressed as means ± s.e.m. (N=4–6), and P≤0.05 for all significant comparisons.

 

Figure 2
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  		Fig. 2. Temperature dependence of State IVol (pmol O mg–1 mitochondrial protein min–1) respiration rates, determined in mitochondria from 5°C (A), 15°C (B) and 25°C (C) acclimated northern (filled triangles) and southern (open circles) killifish. Significant differences within a population and acclimation temperature are indicated with different letters. An asterisk (*) indicates a significant difference between the 25°C acclimation group and the 5 and 15°C acclimation groups when assayed at the same temperature (indicated on 25°C data). An arrow ({downarrow}) indicates the temperature of inflection (the assay temperature where the largest change in slope was observed) within each acclimation temperature group. Data are expressed as means ± s.e.m. (N=4–6), and P≤0.05 for all significant comparisons.

 

Figure 3
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  		Fig. 3. Metabolic rates (µmol g–1 h–1) for northern (black) and southern (white) killifish acclimated to 5, 15 or 25°C (A) or acclimated to 5°C and acutely challenged with increasing temperatures (B). Oxygen consumption rate (MO2) values are expressed as means ± s.e.m. (N=6–8 per population and temperature treatment). Different letters indicate significant differences (P≤0.05) between acclimation groups within a population, and an asterisk (*) indicates a significant difference (P≤0.05) between populations within an acclimation temperature.

 

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© The Company of Biologists Ltd 2009