Thermoregulatory and metabolic responses to hypoxia in the oviparous lizard, Phrynocephalus przewalskii.
Comp Biochem Physiol A Mol Integr Physiol
; 165(2): 207-13, 2013 Jun.
Article
em En
| MEDLINE
| ID: mdl-23500623
ABSTRACT
The effects of hypoxia on behavioral thermoregulation, rate of heating and cooling, hysteresis of heart rate, and standard metabolic rate (SMR) were investigated in Phrynocephalus przewalskii, a small size toad headed lizard. Preferred temperature (T(b)) descended when lizards were exposed to severe hypoxia (8% O(2) and 6% O(2)) for 22 h, and lizards were able to maintain preferred T(b) after one week at 12% and 8% O(2) respectively. The period of heating increased after being treated with hypoxia (12% and 8% O(2)) for one week. Hysteresis of heart rate appeared at any given body temperature and oxygen level except at 39 °C and 40 °C at 8% O(2). SMR significantly increased after one-week acclimatization to 12% and 8% O(2) when ambient temperature (T(a)) was 25 °C, however, it did not change at 35 °C. Thus, we suggest that P. przewalskii has special thermoregulatory and metabolic mechanisms to acclimatize to the hypoxic environment.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Regulação da Temperatura Corporal
/
Metabolismo Energético
/
Lagartos
/
Hipóxia
Limite:
Animals
Idioma:
En
Ano de publicação:
2013
Tipo de documento:
Article