Eduardo Sanabria

vol. 23 número1 Sobre la puesta, incubacion de huevos, nacimiento y desarrollo de crías de Philodryas viridissima (Colubridae: Xenodontinae) en cautiverio Liolaemus puna Lobo y Espinoza, 2004 (Squamata: Liolaemidae) índice de autores índice de materia búsqueda ...

... Las márgenes de inundación y los cuerpos de agua permanentes fue-ron comúnmente utilizadas por Rhinella arenarum y Leptodactylus latrans [=oce-llatus], mientras que Pleurodema nebu-losum fue detectado en las laderas de La Sierra Chica de Zonda. ...

The regulation of body temperature in ectotherms has a major impact in their physiological and behavioral processes. Observing changes in thermal parameters related with reproduction allows us to better understand how Rhinella arenarum optimizes a thermal resource. The aim of this study was to compare the thermal parameters of this species between breeding and non-breeding periods. In the field, we recorded the body temperature from captured animals, the air temperature, and the temperature of the substrate. In the laboratory, we measured the temperature R. arenarum selected on a thermal gradient and the critical extreme temperatures. The results of our study show variations in thermal parameters between the two situations studied. This species makes efficient use of thermal resources during the breeding period by basking to significantly increase body temperature. Because calling is energetically costly for males, this behavior results in increased efficiency to callers during the breeding period.

... Eduardo Sanabria 1* , Yanina Ripoll 1,2 , Marcelo Jordan 1,2 , Lorena Quiroga 1 , Mariano Ariza 2 , María Guillemain 2 , Mauricio Pérez 2 and Héctor Chávez 2. ... Hanselmann, R., A. Rodríguez, M. Lampo, L. Fajardo–Ramos, A. Aguirre, A. Kilpatrick, JP Rodríguez and P. Daszak. ...

We determined if the photoperiod regime affects the thermal biology of the tadpoles of Odontophrynus occidentalis from the Monte desert (Argentina). Variables measured were: selected body temperature (Tsel), critical thermal maximum (CTmax) and thermal critical minimum (CTmin). The tadpoles were acclimated to 15±2 °C for 15 days, and they were divided in three experimental groups: 24 h light, 24 h dark and 12 h/12 h light/dark. Data indicate that the photoperiod had an important effect upon the thermal biology of the Odontophrynus occidentalis tadpoles. The treatment group exposed to 24 h of light showed the highest selected temperature and thermal extremes. We suggest that changes in photoperiod may allow these organisms to anticipate the future changes in their thermal environment, as longer days usually involve higher temperatures.

... San Juan, Argentina. Lorena B. Quiroga 1 , Eduardo A. Sanabria, and Juan C. Acosta. ... Guerrero, 2001). The high values of IRI are attributable to the numerical fraction of ants rather than their volumetric fraction (see also Basso, 1990). The ...

We determined and compared the efficiency of thermoregulation of Rhinella arenarum in the Monte desert (Argentina) in two seasons, dry and wet. In the field, we measured body temperatures, micro-habitat temperatures and operative temperatures; while in the laboratory; we measured the selected body temperatures. Our results show a change in the thermoregulatory strategy of R. arenarum that is related to environmental constraints on their thermal niche. R. arenarum has the ability to be plastic and combine two strategies: (i) a moderate thermoregulator in the wet season, where thermal resources are available such that body temperature is maintained within the set points and physiologicial and behavioral processes are optimized; and (ii) a thermoconformer in the dry season where the thermal environment is more homogeneous and there is greater time invested in searching for food.