How does Spix's yellow-toothed cavy (Galea spixii Wagler, 1831) face the thermal challenges of the Brazilian tropical dry forest?
| Autor: | Moacir Franco de Oliveira, João Paulo Araújo Fernandes de Queiroz, Vanessa Raquel de Morais Oliveira, João Batista Freire Souza-Junior, Leonardo Lelis de Macedo Costa |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Tropical and subtropical dry broadleaf forests
Convection Male Convective heat transfer Physiology Infrared Rays Spix's yellow-toothed cavy Rodentia Wind Forests Eye Biochemistry Animal science Galea Animals Tropical Climate biology Temperature Humidity Thermoregulation biology.organism_classification Thermal radiation Thermography Female General Agricultural and Biological Sciences Brazil Developmental Biology Body Temperature Regulation |
| Zdroj: | Journal of thermal biology. 88 |
| ISSN: | 0306-4565 |
| Popis: | The aim of this work was to investigate the thermal biology of the Spix's yellow-toothed cavy (Galea spixii) from the hot and dry environment of the Brazilian Caatinga by infrared thermography and biophysical equations. We monitored the rectal temperature, as well as the non-evaporative (radiative and convective pathways) and evaporative heat exchanges of males and females. The mean rectal temperature of females and males was 37.58 ± 0.02 and 37.47 ± 0.02 °C, respectively. We identified thermal windows by infrared thermography. The surface temperatures and the long-wave radiation heat exchanges were higher in the periocular, preocular, pinnae and vibrissae regions, in that order. The surface temperature of the periocular and preocular regions correlated positively with rectal temperature. Convective heat exchange was insignificant for thermoregulation by G. spixii. Evaporative heat loss increased when the thermal environment inhibited the radiative pathway. Females showed higher evaporative thermolysis than males at times of greater thermal challenge, suggesting a lower tolerance to heat stress. Therefore, infrared thermography identified the thermal windows, which represented the first line of defense against overheating in G. spixii. The periocular and preocular surface temperatures could be used as predictors of the thermal state of G. spixii. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect