CIGEOBIO   24054
CENTRO DE INVESTIGACIONES DE LA GEOSFERA Y BIOSFERA
Unidad Ejecutora - UE
artículos
Título:
Effect of temperature on the locomotor performance of species in a lizard assemblage in the Puna region of Argentina
Autor/es:
ACOSTA JUAN C.; BLANCO G.; ACOSTA JUAN C.; BLANCO G.; RODRIGO GOMEZ ALÉS; CORDOBA M.; RODRIGO GOMEZ ALÉS; ASTUDILLO V; CORDOBA M.; D. MILES; ASTUDILLO V; D. MILES
Revista:
JOURNAL OF COMPARATIVE PHYSIOLOGY B-BIOCHEMICAL SYSTEMIC AND ENVIRONMENTAL PHYSIOLOGY
Editorial:
Springer Berlin Heidelberg
Referencias:
Año: 2018 p. 977 - 990
ISSN:
0174-1578
Resumen:
Locomotion is relevant to the ecology of reptiles because of its presumed influence on an organism?s Darwinian fitness.Moreover, in ectothermic species, physiological performance capacity is affected by body temperature. We analyzed twocomponents of locomotor performance in three species of lizards, Phymaturus extrilidus, Liolaemus parvus, and Liolaemusruibali, in the Puna environment of Argentina. First, we estimated the thermal sensitivity of locomotion by measuring sprintspeed at four different body temperatures. We included two measures of sprint speed: initial velocity and long sprint forsustained runs. Based on these data, we calculated the optimal temperature for performance and the optimal performancebreadth. We also estimated endurance capacity at a single temperature. Maximum sprint speed for L. parvus was greater thanL. ruibali and P. extrilidus in both initial velocity and long sprint. In contrast, L. parvus exhibited lower levels of endurancethan L. ruibali and P. extrilidus. However, endurance in L. ruibali exceeded that of P. extrilidus. The species differed in theoptimal temperature for the initial velocity with the lowest for L. ruibali (31.8 °C) followed by P. extrilidus (33.25 °C) andthen L. parvus (36.25 °C). The optimal temperature for long sprint varied between 32 and 36 °C for all species. We foundthat all species attained maximum performance at body temperatures commonly experienced during daily activity, which washigher than the thermal quality of the environment. We found evidence for thermal sensitivity in locomotor performance inthese species. However, we also show that the broad thermal breadth of performance suggests that the lizards are capable ofsustaining near optimal levels of locomotor performance at ambient temperatures that would appear to be suboptimal. Thus,this lizard assemblage is capable of coping with the highly variable climatic conditions in the Puna region of Argentina.