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Photoperiod acclimation and 24-hour variations in the critical thermal maxima of a tropical and a temperate frog

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Summary

The effect of photoperiod on the upper thermal tolerance of two species of frogs was studied by using the critical thermal maximum (CTM) as the end point. Both species are heliotropic and from temperate climates, but Hyla labialis lives under a near constant tropical photoperiod while Rana pipiens lives under a varying temperatezone photoperiod. The CTM of both species was studied over a 24-hour period to determine if a rhythm of temperature tolerance exists. In all but one of the acclimatization conditions used, the CTM of R. pipiens was higher than that of H. labialis. This agrees with what is known of their thermal ecology. Photoperiod significantly affects the CTM of both species. For Rana pipiens long (LD 16:8) photoperiods result in significantly higher thermal tolerance than short (LD 8:16) or moderate (LD 12:12) photoperiods at both 15 and 25° C. H. labialis shows a different pattern, having highest CTM at 25°C, LD 12:12 and lowest at 15°C, LD 12:12. When acclimated to a short (LD 8:16) photoperiod certain aspects of the frogs' tolerance of high temperatures are altered. At the same acclimatization the CTM of R. pipiens is higher than that of H. labialis, except under a combination short light regime and low temperature, and H. labialis at LD 8:16 shows no thermal acclimation between 15 and 25°C. Significant variation in the CTM over a 24-hour period occurred in H. labialis acclimatized at 25°C, LD 12:12 and R. pipiens at 25°C, LD 8:16 and 15°C, LD 12:12. For both species the 24-hour rhythm of temperature tolerance, when it occurs at LD 12:12, might be of adaptive value. Times of highest thermal tolerance are in the late morning or early afternoon and lowest tolerance is during the dark period. For R. pipiens under the unnatural combination of 25°C, LD 8:16, the pattern is reversed. When all three significant cycles are phase shifted so that the times of highest tolerance coincide, the pattern of the curves is very similar.

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Authors and Affiliations

  1. Department of Zoology, University of Rhode Island, Kingston, USA

    J. J. Mahoney & V. H. Hutchison

  2. Institute of Environmental Biology, University of Rhode Island, Kingston, USA

    J. J. Mahoney & V. H. Hutchison

  3. Institute of Ecology, University of Georgia, Athens

    J. J. Mahoney

Authors
  1. J. J. Mahoney
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  2. V. H. Hutchison
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Mahoney, J.J., Hutchison, V.H. Photoperiod acclimation and 24-hour variations in the critical thermal maxima of a tropical and a temperate frog. Oecologia 2, 143–161 (1969). https://doi.org/10.1007/BF00379157

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