Direct effects of incubation temperature on morphology, thermoregulatory behaviour and locomotor performance in jacky dragons (Amphibolurus muricatus)

作者：Esquerre Damien; Keogh J Scott; Schwanz Lisa E^*

来源：Journal of Thermal Biology, 2014, 43: 33-39.

DOI：10.1016/j.jtherbio.2014.04.007

• Phenotypic plasticity
• Incubation temperature
• Maternal effects
• Jacky dragons
• Amphibolurus muricatus

Incubation temperature is one of the most studied factors driving phenotypic plasticity in oviparous reptiles. We examined how incubation temperature influenced hatchling morphology, thermal preference and temperature-dependent running speed in the small Australian agamid lizard Amphibolurus muricatus. Hatchlings incubated at 32 degrees C grew more slowly than those incubated at 25 and 28 degrees C during their first month after hatching, and tended to be smaller at one month. These differences were no longer significant by three months of age due to selective mortality of the smallest hatchlings. The cooler incubation treatments (25 degrees C and 28 degrees C) produced lizards that had deeper and wider heads. Hatchlings from 28 degrees C had cooler and more stable temperature preferences, and also had lower body temperatures during a 2-h thermoregulatory behaviour trial. Locomotor performance was enhanced at higher body temperatures, but incubation temperature had no measurable effect either independently or in interaction with body temperature. Our study demonstrates that incubation temperature has direct effects on morphology and thermoregulatory behaviour that appears to be independent of any size-dependent effects. We postulate a mechanistic link between these two effects.

• 出版日期2014-7