Ecología térmica de la lagartija de lava de Santa Cruz (Microlophus indefatigabilis) de Gálapagos, Ecuador: implicaciones del fenómeno de El Niño
DOI:
https://doi.org/10.22201/ib.20078706e.2022.93.3895Palabras clave:
Termorregulación, Temperatura óptima, Desempeño locomotor, Amplitud térmica, Islas Galápagos, Cambio climático, Restricción térmicaResumen
La temperatura es la principal variable ambiental de la que dependen las lagartijas para mantener sus procesos metabólicos, esta influencia el desempeño locomotor. Debido a esto, si la temperatura ambiental aumenta como consecuencia del cambio climático, los lacertilios podrían verse afectados fisiológica y ecológicamente. Evaluamos la eficiencia térmica y el desempeño locomotor de 3 poblaciones de Microlophus indefatigabilis. Registramos las temperaturas corporales, seleccionadas y críticas de los organismos, su desempeño locomotor y temperaturas operativas durante la temporada fría de 2017. Analizamos las temperaturas ambientales durante el fenómeno de El Niño de 1997 y 2015. Calculamos sus horas de restricción térmica durante el muestreo y ante los posibles aumentos en la temporada fría durante El Niño. Encontramos que las temperaturas corporales variaron significativamente entre poblaciones, pero conservan sus temperaturas seleccionadas, las cuales son cercanas a su temperatura óptima. Microlophus indefatigabilis tiende a termorregular y el extremo superior de su amplitud térmica está cercano a la temperatura crítica máxima. En años sin influencia de El Niño, la población con escasa cobertura vegetal presentó horas de restricción, pero con el aumento de las temperaturas ambientales, la especie podría incrementar sus horas de restricción, limitando sus horas de alimentación.
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