Thermal biology of two tropical lizards from the Ecuadorian Andes and their vulnerability to climate change


Autoři: Estefany S. Guerra-Correa aff001;  Andrés Merino-Viteri aff001;  María Belén Andrango aff001;  Omar Torres-Carvajal aff001
Působiště autorů: Escuela de Ciencias Biológicas, Museo de Zoología, Pontificia Universidad Católica del Ecuador, Quito, Pichincha, Ecuador aff001;  Escuela de Ciencias Biológicas Laboratorio de Ecofisiología, Pontificia Universidad Católica del Ecuador, Quito, Pichincha, Ecuador aff002
Vyšlo v časopise: PLoS ONE 15(1)
Kategorie: Research Article
doi: 10.1371/journal.pone.0228043

Souhrn

This study aims to analyze the thermal biology and climatic vulnerability of two closely related lizard species (Stenocercus festae and S. guentheri) inhabiting the Ecuadorian Andes at high altitudes. Four physiological parameters—body temperature (Tb), preferred temperature (Tpref), critical thermal maximum (CTmax), and critical thermal minimum (CTmin)—were evaluated to analyze the variation of thermophysiological traits among these populations that inhabit different environmental and altitudinal conditions. We also evaluate the availability of operative temperatures, warming tolerance, and thermal safety margin of each population to estimate their possible risks in the face of future raising temperatures. Similar to previous studies, our results suggest that some physiological traits (CTmax and Tb) are influenced by environmental heterogeneity, which brings changes on the thermoregulatory behavior. Other parameters (Tpref and CTmin), may be also influenced by phylogenetic constraints. Moreover, the fluctuating air temperature (Tair) as well as the operative temperatures (Te) showed that these lizards exploit a variety of thermal microenvironments, which may facilitate behavioral thermoregulation. Warming tolerance and thermal safety margin analyses suggest that both species find thermal refugia and remain active without reducing their performance or undergoing thermal stress within their habitats. We suggest that studies on the thermal biology of tropical Andean lizards living at high altitudes are extremely important as these environments exhibit a unique diversity of microclimates, which consequently result on particular thermophysiological adaptations.

Klíčová slova:

Body temperature – Climate change – Forests – Lizards – Reptile biology – Sensory physiology – Sunlight – Evolutionary physiology


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2020 Číslo 1