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Figure 2


Fig. 2. Histograms showing times of arousal (filled vertical bars) and times of re-entry into torpor (open vertical bars) by bats over their rest phase during exposure to a diurnal fluctuation in ambient temperature (Ta; shown at the top) that commenced heating at (A) 06:00 h, (B) 09:00 h or (C) 12:00 h. Bats were placed into respirometry chambers in the evening (Ta: 13°C) and all had entered torpor during the night or around the time of lights on. All bats aroused in response to passive rewarming when heating commenced at 09:00 h or 12:00 h. When heating commenced at 06:00 h, bats (n=3) remained in torpor throughout on 4 of 15 (27%) days. The horizontal black and white bars above indicate the photophase.





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