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Thermal biology in two syntopic lizards, Phymaturus extrilidus and Liolaemus parvus, in the Puna region of Argentina.
Gómez Alés, Rodrigo; Acosta, Juan Carlos; Laspiur, Alejandro.
Afiliação
  • Gómez Alés R; DIBIOVA (Diversidad y Biología de Vertebrados del Árido), Departamento de Biología, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de San Juan, Av. Ignacio de la Roza 590 (O), Rivadavia, San Juan CPA: J5402DCS, Argentina; CONICET (Consejo Nacional de Investigaciones Científicas y Técnicas), Argentina. Electronic address: rodri.gomezales@gmail.com.
  • Acosta JC; DIBIOVA (Diversidad y Biología de Vertebrados del Árido), Departamento de Biología, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de San Juan, Av. Ignacio de la Roza 590 (O), Rivadavia, San Juan CPA: J5402DCS, Argentina; CIGEOBIO-CONICET, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de San Juan, Av. Ignacio de la Roza 590 (O), Rivadavia, San Juan CPA: J5402DCS, Argentina.
  • Laspiur A; CONICET (Consejo Nacional de Investigaciones Científicas y Técnicas), Argentina.
J Therm Biol ; 68(Pt A): 73-82, 2017 Aug.
Article em En | MEDLINE | ID: mdl-28689724
Body temperature is the most important ecophysiological variable affecting reptiles' life history. Moreover, thermoregulation in ectotherms implies a struggle to reach preferred temperatures in natural conditions due to the influence of biotic and abiotic factors. Our objective was to evaluate and compare the thermal biology of two syntopic species, Phymaturus extrilidus and Liolaemus parvus, in the Puna region of San Juan, Argentina. We determined body temperature (Tb), micro-environmental temperatures (Ta and Ts) and operative temperatures (Te) in the field. In the laboratory, we measured preferred temperatures (Tpref) and calculated the index of thermoregulatory efficiency (E). Neither body temperatures in the field nor preferred temperatures varied between seasons and sexes. Body temperatures were lower than preferred temperatures for both species. Nevertheless, regardless of the low thermal offer available in habitat, both species did achieve body temperatures higher than operative temperatures during activity. Thermoregulatory effectiveness was moderate in P. extrilidus (E=0.65), while L. parvus presented greater thermoregulatory efficiency (E=0.78). We conclude that under the rigorous climate conditions of the Puna, Phymaturus extrilidus and Liolaemus parvus are able to actively and efficiently thermoregulate, maintaining body temperatures close to the preferred and higher than those of its habitat. Differences in thermal characteristics between Phymaturus extrilidus and Liolaemus parvus are a consequence of differential limitations imposed on each species by the environment and of forces inherent to their life histories.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Temperatura Corporal / Lagartos Limite: Animals País/Região como assunto: America do sul / Argentina Idioma: En Revista: J Therm Biol Ano de publicação: 2017 Tipo de documento: Article País de publicação: Reino Unido
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Temperatura Corporal / Lagartos Limite: Animals País/Região como assunto: America do sul / Argentina Idioma: En Revista: J Therm Biol Ano de publicação: 2017 Tipo de documento: Article País de publicação: Reino Unido