Behavioural thermoregulation by the endangered crocodile lizard (Shinisaurus crocodilurus) in captivity

Area of Science:

• Herpetology
• Ecology
• Conservation Biology

Background:

• Thermoregulation is vital for ectotherm physiology and survival.
• Understanding behavioral thermoregulation in endangered species is critical for conservation efforts.
• Crocodile lizards (Shinisaurus crocodilurus) face conservation challenges, necessitating research into their environmental responses.

Purpose of the Study:

• To investigate seasonal variations in operative environmental temperature (Te) and body temperature (Tb) in captive crocodile lizards.
• To assess how microhabitat selection (open vs. shaded enclosures) influences thermoregulation in Shinisaurus crocodilurus.
• To determine the thermoregulatory effectiveness of crocodile lizards in response to thermally challenging environments.

Main Methods:

• Seasonal monitoring of operative environmental temperature (Te) and body temperature (Tb).
• Observation of microhabitat use (water, branches, open/shaded areas) within controlled enclosures.
• Comparative analysis of thermoregulatory responses between open and shaded environments.

Main Results:

• Operative environmental temperature (Te) was higher in open enclosures compared to shaded ones.
• Body temperature (Tb) differences were observed between enclosures in summer and autumn, but not spring.
• Crocodile lizards exhibited distinct behavioral thermoregulation strategies, including aquatic refuge in summer and seeking optimal perches in autumn.

Conclusions:

• Crocodile lizards demonstrate behavioral thermoregulation through microhabitat selection.
• The species' overall thermoregulatory effectiveness is limited, highlighting vulnerability to thermal challenges.
• Conservation strategies must include maintaining diverse thermal environments to support behavioral thermoregulation for Shinisaurus crocodilurus.