Full length paper

Relaciones térmicas temporales en una población de Liolaemus koslowskyi

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Cuadernos de Herpetología 16 (1): 33-45, 2002 rmartori@exa.unrc.edu.ar

Abstract

The thermal resource is one of the main restrictions in the activity of ectothermic animals, the preference for certain thermal ranges and the ethologic and phisiologic strategies to adapt the corporal temperature is an important aspect of the biology of these organisms. In this study monthly samples were carried out during two periods of activity between the month of December of 1998 and February of 2000 registering in 30 samples 1078 observations of three thermal variables: corporal temperature (TC), taken immediately after the capture, temperature of the air (TA) to 2 cm of the sight place and the ground temperature (TS). Simultaneously each individual's body size and the sex was registered. The mean of the corporal size (SVL) was of 54.10 mm, the mean of the TC was of 34.76 ºC, the mean of TA was of 30.27 ºC and the mean TS was of 34.50 ºC. The samples where analyzed independently, and also where grouped by month and season, for each treatment the regression slopes between the TC/TA and TC/TS where analyzed under the supposition that the tendency toward the slope 1 means thermoconformity. We concluded that the corporal temperature in general is adjusted better to air temperature, but important information about daily strategies gets lost when samples are grouped. According to the thermal offer of the means the corporal temperature is sometimes related with the air and sometimes with the substrate and the lizards develop strategies to win or to lose temperature according to the temporal circumstances. An analysis of the corporal temperature was carried out, considering sex, months and body size as factors, and the temperature of the air as covariable. This analysis demonstrated that the monthly variation of the thermal relationships is significant, also the variation of the body temperature was significant with regard to the body size, on the other hand they were not significant differences of temperature among sexes.

Key words:

Liolaemus; temperatura corporal; termorregulación; variación temporal; Argentina

Received: Apr. 29, 2002 ▪ Accepted: Jun. 28, 2002

Martori, R.; Aun, L. & Orlandini, S. 2002. Relaciones térmicas temporales en una población de Liolaemus koslowskyi. Cuadernos de Herpetología 16: 33-45.