Infra-red irradiance and set point temperatures in behaviourally thermoregulating lacertid lizards |
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Authors: | Gianluca Tosini Scott Jones Roger Avery |
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Affiliation: | School of Biological Sciences, Bristol University, Bristol BS8 1UG, U.K. |
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Abstract: | - 1. 1. Set point temperatures at which Podarcis muralis and Lacerta vivipara ceased basking (Tmove; upper set point) and commenced basking (Tbask; lower set point) increased incrementally with increasing i.r. irradiance; values for all set point temperatures were higher in the former species.
- 2. 2. Changing the i.r. irradiance during a bask resulted in a shift in the upper set point temperature to a level intermediate between the values expected at constant previous and new irradiances (experiment with L. vivipara only).
- 3. 3. The changes in set-point temperatures following changes in i.r. irradiance were not due to changes in light intensity.
- 4. 4. The ability to respond to immediate changes in i.r. irradiance is adaptive for lizards in areas in which rapid changes in amounts of sunshine are a feature of the climate.
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Keywords: | Thermoregulatory set points behavioural thermoregulation thermography infra-red radiation lizard Podarcis muralis Lacerta vivipara |
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