Intraspecific variation in a physiological thermoregulatory mechanism: the case of the lizard Liolaemus tenuis (Liolaeminae)

The interspecific variation of heating rates in Liolaemus lizards, suggests an adaptive value of this physiological thermoregulatory mechanism, which would allow lizards to cope with the environmental thermal restrictions, imposed to behavioral thermoregulation. This trend has barely been tested at...

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Autores principales:	VIDAL,MARCELA A, ORTIZ,JUAN CARLOS, LABRA,ANTONIETA
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2008
Materias:	geographic variation sexual variation thermoregulation
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000200002
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spelling	oai:scielo:S0716-078X20080002000022009-01-13Intraspecific variation in a physiological thermoregulatory mechanism: the case of the lizard Liolaemus tenuis (Liolaeminae)VIDAL,MARCELA AORTIZ,JUAN CARLOSLABRA,ANTONIETA geographic variation sexual variation thermoregulation The interspecific variation of heating rates in Liolaemus lizards, suggests an adaptive value of this physiological thermoregulatory mechanism, which would allow lizards to cope with the environmental thermal restrictions, imposed to behavioral thermoregulation. This trend has barely been tested at intraspecific level, and here we explore if intraspecific variation in heating rates occurs in Liolaemus tenuis, a relative widely distributed species from central Chile. We test the hypothesis that heating rates are related to the thermal environmental conditions at which populations are exposed, by comparing the heating rates of three populations (from a latitudinal range), which inhabit under different thermal conditions. Additionally, we explore if the intrinsic factor, sex, also modulates heating rates. There was a significant intraspecific variation in heating rates, at population and gender level. These rates however, showed only a partial relationship with the environmental thermal conditions. We found that the northern population, inhabiting at higher temperature, heated slower, which might reduce the risk of overheating. On the other hand, independent of the population, females heated slower than males. The meaning of this sexual variation is unclear, but may be consequence of the significant differences in genders' social behavior. Because males defend a territory with a harem, by heating faster, they can allocate extra time in behaviors associated to the defense and maintenance of the territory.info:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.81 n.2 20082008-06-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000200002en10.4067/S0716-078X2008000200002
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	geographic variation sexual variation thermoregulation
spellingShingle	geographic variation sexual variation thermoregulation VIDAL,MARCELA A ORTIZ,JUAN CARLOS LABRA,ANTONIETA Intraspecific variation in a physiological thermoregulatory mechanism: the case of the lizard Liolaemus tenuis (Liolaeminae)
description	The interspecific variation of heating rates in Liolaemus lizards, suggests an adaptive value of this physiological thermoregulatory mechanism, which would allow lizards to cope with the environmental thermal restrictions, imposed to behavioral thermoregulation. This trend has barely been tested at intraspecific level, and here we explore if intraspecific variation in heating rates occurs in Liolaemus tenuis, a relative widely distributed species from central Chile. We test the hypothesis that heating rates are related to the thermal environmental conditions at which populations are exposed, by comparing the heating rates of three populations (from a latitudinal range), which inhabit under different thermal conditions. Additionally, we explore if the intrinsic factor, sex, also modulates heating rates. There was a significant intraspecific variation in heating rates, at population and gender level. These rates however, showed only a partial relationship with the environmental thermal conditions. We found that the northern population, inhabiting at higher temperature, heated slower, which might reduce the risk of overheating. On the other hand, independent of the population, females heated slower than males. The meaning of this sexual variation is unclear, but may be consequence of the significant differences in genders' social behavior. Because males defend a territory with a harem, by heating faster, they can allocate extra time in behaviors associated to the defense and maintenance of the territory.
author	VIDAL,MARCELA A ORTIZ,JUAN CARLOS LABRA,ANTONIETA
author_facet	VIDAL,MARCELA A ORTIZ,JUAN CARLOS LABRA,ANTONIETA
author_sort	VIDAL,MARCELA A
title	Intraspecific variation in a physiological thermoregulatory mechanism: the case of the lizard Liolaemus tenuis (Liolaeminae)
title_short	Intraspecific variation in a physiological thermoregulatory mechanism: the case of the lizard Liolaemus tenuis (Liolaeminae)
title_full	Intraspecific variation in a physiological thermoregulatory mechanism: the case of the lizard Liolaemus tenuis (Liolaeminae)
title_fullStr	Intraspecific variation in a physiological thermoregulatory mechanism: the case of the lizard Liolaemus tenuis (Liolaeminae)
title_full_unstemmed	Intraspecific variation in a physiological thermoregulatory mechanism: the case of the lizard Liolaemus tenuis (Liolaeminae)
title_sort	intraspecific variation in a physiological thermoregulatory mechanism: the case of the lizard liolaemus tenuis (liolaeminae)
publisher	Sociedad de Biología de Chile
publishDate	2008
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2008000200002
work_keys_str_mv	AT vidalmarcelaa intraspecificvariationinaphysiologicalthermoregulatorymechanismthecaseofthelizardliolaemustenuisliolaeminae AT ortizjuancarlos intraspecificvariationinaphysiologicalthermoregulatorymechanismthecaseofthelizardliolaemustenuisliolaeminae AT labraantonieta intraspecificvariationinaphysiologicalthermoregulatorymechanismthecaseofthelizardliolaemustenuisliolaeminae
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Intraspecific variation in a physiological thermoregulatory mechanism: the case of the lizard Liolaemus tenuis (Liolaeminae)

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