Preferred Body Temperature of Free-Ranging Starred Agama Laudakia stellio (Linnaeus, 1758) (Agamidae) from Egypt

Samy A. Saber


Preferred body temperature of Starred Agama Laudakia stellio collected from Western Coastal Desert of Egypt was monitored telemetrically in a temperature gradient. It was found to be a good thermoregulator lizard using behavioral means. Shuttling behavior between the hot and cold sides of the temperature gradient was found to be the main means of body temperature regulation. The mean selected body temperature was 35.9 and 37.7°C at day and 32.9 and 37.2°C at night in males and females, respectively. At LD it showed a well defined circadian rhythm with high selected body temperature during photophase and low value during scotophase. Under LL and DD the amplitude of the body temperature rhythm was greatly reduced. It was found that Laudakia stellio selected lower body temperature at night in spite of the availability of a wide range of temperatures in the thigmothermal temperature gradient which may prolong potential foraging time the following day.


Agamidae; Laudakia stellio; body temperature; Egypt

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Angilletta M. J. and Werner Y. L. (1998), «Australian geckos do not display dial variation in thermoregulatory behavior», Copeia, 1998, 736 – 742.

Avery R. A. (1979), «Lizards, a study in the thermoregulation», in: Studies in Biology. No. 109, Edward Arnold, London.

Berk M. L. and Heath J. E. (1975), «An analysis of behavioral thermoregulation in the lizard, Dipsosaurus dorsalis», J. Thermal Boil., 1(1), 15 – 22.

Blumberg M. S., Lewis S. J., and Sokoloff G. (2002), «Incubation temperature modulates post-hatching thermoregulatory behavior in the Madagascar ground gecko, Paroedura pictus», J. Exp. Biol., 205, 2777 – 2784.

Bogert C. M. (1949), «Thermoregulation in reptiles; a factor in evolution», Evolution, 3, 195 – 211.

Cadena V. and Tattersall G. J. (2009), «Decreased precision contributes to the hypoxic thermoregulatory response in lizards», J. Exp. Biol., 212, 137 – 144.

Cloudsely-Thompson J. L. (1961), Rhythmic Activity in Animal Physiology and Behavior, Acad. Press, New York – London.

Cothran M. L. and Hutchison V. H. (1979), «Effect of melatonin on thermal selection Crotaphytus collaris (Squamata: Iguanidae)», Comp. Biochem. Physiol. A, 63, 461 – 466.

Cowles R. B. and Bogert C. M. (1944), «A preliminary study on the thermal requirements of desert reptiles», Bull. Am. Mus. Nat. Hist., 83, 267 – 296.

Cowgell J. and Underwood H. (2005), «Behavioral thermoregulation in lizards: A circadian rhythm», J. Exp. Biol., 210(1), 189 – 194.

De Witt C. B. (1967), «Precision of thermoregulation and its relation to environmental factors in the desert iguana Dipsosaurus dorsalis», Physiol. Zool., 40, 265 – 273.

Ellis D. J., Firth B. T., and Belan I. (2006), «Circadian rhythm of behavioral thermoregulation in the sleepy lizard (Tiliqua rugosa)», Herpetologica, 62(3), 259 – 265.

Ellis D. J., Firth B. T., and Belan I. (2007), «Circadian rhythms of locomotor activity and temperature selection in sleepy lizards, Tiliqua rugosa», J. Comp. Physiol. A. Neuroethol. Sens. Neural Behav. Physiol., 193(7), 695 – 701.

Engbretson G. A. and Hutchison V. H. (1976), «Parietalectomy and thermal selection in the lizard, Scelopours occidentalis», J. Exp. Zool., 198, 29 – 38.

Firth B. T., Turner J. S., and Ralph C. L. (1989), «Thermoregulatory behaviour in two species of iguanid lizards (Crotaphytus collaris and Sauromalus obesus): dial variation and the effect of pinealectomy», J. Comp. Physiol. B. Biochem. Syst. Env. Physiol., 159(1), 13 – 20.

Gehrmann W. H. (1971), «Influence of constant illumination on the thermal performance in the immature water snake, Natrix erythrogaster transversa», Physiol. Zool., 44, 84 – 89.

Hammel H. T., Caldwell F. T., and Abrams R. M. (1967), «Regulation in the body temperature in the blue-tongued lizard», Science New Ser., 156, 1260 – 1262.

Harlow H. J., Purwandana D., Jessop T. S., and Phillips J. A. (2010), «Size-related differences in the thermoregulatory habits of free-ranging komodo dragons», Int. J. Zool., 2010, ID 921371.

Huey R. B. (1982), «Temperature, physiology, and ecology of reptile», in: C. Gans and D. W. Tinkel (eds.), Biology of the Reptilia. Vol. 12. No. 1, Acad. Press, London – New York, pp. 25 – 91.

Hutchison V. H. and Kosh R. J. (1974), «Thermoregulatory function of the parietal eye in the lizard Anolis carolinensis», Oecologia, 16, 173 – 177.

Myhre K. and Hammel H. T. (1969), «Behavioral regulation of internal temperature in the lizard Tiliqua scincoides», Am. J. Physiol., 217, 490 – 1495.

Regal P. J. (1967), «Voluntary hypothermia in reptiles», Science New Ser., 155, 1551 – 1553.

Regal P. J. (1974), «Circadian and low frequency rhythms in the temperature performance of the lizard», in: L. E. Scheving, F. Halberg, and J. E. Pauly (eds.), Chronobiology, Igaku Shoin, Tokyo, pp. 709 – 711.

Rismiller P. D. (1987), Thermal Biology of Lacerta viridis Seasonal Aspects. Ph.D. Thesis, Philipps Universität, Marburg, Germany.

Rismiller P. D. and Heldmaier G. (1982), «The effect of photoperiod on temperature selection in the european green lizard, Lacerta viridis», Oecologia, 53, 222 – 226.

Rismiller P. D. and Heldmaier G. (1988), «How photoperiod influences body temperature selection in Lacerta viridis», Oecologia, 75(1), 125 – 131.

Rock J., Andrews R. M., and Cree A. (2000), «Effect of reproductive condition, season, and site on selected temperature of a viviparous gecko», Physiol. Biochem. Zool., 73(3), 344 – 355.

Ruf T. and Heldmaier G. (1986), «Computerized body temperature telemetry in small animals», Comput. Biol. Med., 17(5), 331 – 340.

Spellerberg I. F. (1974), «Influence of photoperiod and light intensity on lizard voluntary temperatures», Br. J. Herpetol., 5, 412 – 420.

Spellerberg I. F. and Smith N. D. (1975), «Inter- and intra-individual variation in lizard voluntary temperatures», Br. J. Herpetol., 5, 496 – 504.

Spears M. W. and Angilletta M. J. (2004), «Body size clines in Sceloporus lizards: proximate mechanisms and demographic constraints», Integr. Comp. Biol., 44, 433 – 442.

SPSS, release 9.0.0 (1998), Statistica for Windows, Standard Version.

Regal P. J. (l967), «Voluntary hypothermia in reptiles», Science New Ser., 155(3769), 1551 – 1553.

Tracy C. R., Flack K. M., Zimmerman L. C., Espinoza R. E., and Tracy C. R. (2005), «Herbivory imposes constraints on voluntary hypothermia in lizards», Copeia, 2005(1), 12 – 19.

Vidal M. A., Habit E., Victoriano P., Gonzalez-Gijardo A., and Ortiz J. C. (2010), «Thermoregulation and activity pattern of the high-mountain lizard Phymaturus palluma (Tropiduridae) in Chile», Zoologia, 27(1), 13 – 18.

Underwood H. (1980), «Photoperiodic photoreception in the male lizard Anolis carolinensis: The eyes are not involved», Comp. Biochem. Physiol. A, 67, 91 – 194.

Underwood H. (1992), «Endogenous rhythms», in: C. Gans and D. Crews (eds.), Biology of the Reptilia. Physiology. E. Hormones, Brain, and Behavior, Univ. of Chicago Press, Chicago, pp. 229 – 297.

Zari T. A. (1996), «Effects of body mass and temperature on standard metabolic rate of the herbivorous desert lizard Uromastyx philbyi», J. Arid Environ., 33, 457 – 461.



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