INIBIOMA   20415
INSTITUTO DE INVESTIGACIONES EN BIODIVERSIDAD Y MEDIOAMBIENTE
Unidad Ejecutora - UE
artículos
Título:
Thermal relationships between body temperature and environment conditions set upper distributional limits on oviparous species
Autor/es:
MARLIN MEDINA; ALEJANDRO SCOLARO; FAUSTO MÉNDEZ-DE LA CRUZ; BARRY SINERVO; NORA IBARGÜENGOYTÍA
Revista:
JOURNAL OF THERMAL BIOLOGY
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Año: 2011 vol. 36 p. 527 - 534
ISSN:
0306-4565
Resumen:
We determined the thermal biology of the oviparous Liolaemus boulengeri and the viviparous Liolaemus lineomaculatus populations localised at high and low latitude sites in Patagonia, Argentina. We present data of body temperatures in the field (T b ) and preferred temperature in the laboratory (T pref ), micro- environmental and operative temperatures and the effectiveness of thermoregulation. Liolaemus boulengeri and L. lineomaculatus choose different heat sources for active selection of suitable thermal micro-environments for thermoregulation, and the oviparous L. boulengeri is a more effective thermoregulator (E ¼ 0.55) than the viviparous L. lineomaculatus (E ¼ 0.43). Even when L. boulengeri is a better thermoregulator and both species show identical timing in the reproductive cycles, there are constraint factors that impose limitations on the southernmost distribution of the oviparous L. boulengeri.