Regulación térmica en dos murciélagos insectívoros (Myotis keaysi y Myotis oxyotus) de los andes venezolanos.
Palabras clave:
Insectivorous bats, metabolic rate, thermoregulation, tropical andes, VenezuelaResumen
En este trabajo se puso a prueba las hipótesis de que las restricciones termorregulatorias están correlacionadas con la diferenciación altitudinal de dos especies andinas de murciélagos insectívoros, Myotis oxyotus y Myotis keaysi, en los Andes venezolanos, así como también entre ellas y otras especies de murciélagos insectívoros de tierras bajas. Se midieron sus respectivas temperaturas corporales y consumo de oxígeno, a la vez que se calcularon sus tasas metabólicas y conductancias térmicas a diferentes temperaturas ambientales (2-35ºC) empleando un respirómetro de flujo abierto. Ambas especies utilizaron el “torpor” como principal estrategia de ahorro energético cuando fueron expuestas a temperaturas ambientales por debajo de sus temperaturas críticas inferiores. Myotis keaysi mostró una tasa metabólica media de 1,2 ± 0,02 ml O2 g-1 h-1 y una estrecha zona de termoneutralidad. Igualmente, la tasa metabólica basal de Myotis oxyotus fue de de 0,92 ± 0,04 ml O2 g-1 h-1 y mostró una zona termoneutral más extendida (7,3°C) así como un menor valor de temperatura crítica inferior (25,2°C). Los rasgos fisiológicos de ambas especies concuerdan con su distribución altitudinal y muestran fuertes contrastes en estrategias termorregulatorias con los murciélagos insectívoros de tierras bajas.
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Fondo Nacional de Ciencia Tecnología e Innovación
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Consejo de Desarrollo Científico, Humanístico, Tecnológico y de las Artes, Universidad de Los Andes Venezuela
Números de la subvención C-1039-00-01-EM
