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First published online December 1, 2006
Journal of Experimental Biology 209, 4869-4877 (2006)
Published by The Company of Biologists 2006
doi: 10.1242/jeb.02585

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Compensation for environmental change by complementary shifts of thermal sensitivity and thermoregulatory behaviour in an ectotherm

E. J. Glanville and F. Seebacher^*

School of Biological Sciences A08, University of Sydney, NSW 2006, Australia

View larger version (17K): [in this window] [in a new window]   Fig. 1. Changes in thermoregulatory behaviour of Crocodylus porosus during acclimation. At the start of acclimation, all animals heated to the same maximum body temperature (Tb) during the day (A; means are shown, and all means ± s.e.m. <0.3°C). At the end of the acclimation period, crocodiles still displayed their characteristic thermoregulatory pattern, but maximum body temperatures of cold-acclimated animals (broken line) were significantly lower (B). During cold acclimation, maximum body temperatures (C; means ± s.e.m.) and mean daily body temperatures (D; means ± s.e.m.) decreased significantly.

View larger version (10K): [in this window] [in a new window]   Fig. 2. Maximal sustained swimming performance shifts significantly with acclimation and coincides with mean body temperatures within each treatment (broken line, cold acclimation; solid line, warm acclimation). BL, body length.

View larger version (25K): [in this window] [in a new window]   Fig. 3. Mitochondrial oxygen consumption rates (left panels) and respiratory control ratios (RCRs) (right panels) for liver (A,B), tail muscle (C,D) and heart (E,F) at different assay temperatures. State 3 (SIII) respiratory rates are shown as broken lines and state 4 (SIV) rates as solid lines; cold-acclimation treatments are represented by blue and warm-acclimation treatments by red. There are significant differences between acclimation treatments in SIII rates and RCRs of liver (A,B) and muscle (C,D), and RCRs of heart mitochondria differ significantly between acclimation treatments (F).

View larger version (11K): [in this window] [in a new window]   Fig. 4. Activities (mean ± s.e.m.) of lactate dehydrogenase (LDH) (units g-1 wet tissue) in liver (A), tail muscle (B) and heart (C). Open boxes indicate cold-acclimation treatment and solid boxes indicate warm-acclimation treatment. LDH activity is significantly greater at low temperatures in cold-acclimated animals in muscle and heart, but not in liver.

View larger version (10K): [in this window] [in a new window]   Fig. 5. Activities (mean ± s.e.m.) of cytochrome c oxidase (CCO) (units g-1 wet tissue) in liver (A), tail muscle (B) and heart (C). Open boxes indicate cold-acclimation treatment, and solid boxes indicate warm-acclimation treatment. There are significant interactions between acclimation treatment and test temperature in liver and heart, but not in muscle.

View larger version (9K): [in this window] [in a new window]   Fig. 6. Activities (mean ± s.e.m.) of citrate synthase (CS) (units g-1 wet tissue) in liver (A), tail muscle (B) and heart (C). Open boxes represent cold-acclimation treatment, and solid boxes represent warm-acclimation treatment. There are significant interactions between acclimation treatment and test temperature in muscle and heart, but not in liver.