Thermal biology in two syntopic lizards, Phymaturus extrilidus and Liolaemus parvus, in the Puna region of Argentina

Alés, Rodrigo Gómez; Acosta, Juan Carlos; Laspiur, Alejandro

doi:10.1016/j.jtherbio.2017.02.001

Cited by 28 publications

(28 citation statements)

References 76 publications

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“…In this paper, we hypothesize that: (1) the preferred body temperature of P. tenebrosus ( T pref ) is correlated with its T o for locomotor performance, as postulated by the thermal coadaptation hypothesis (Huey & Bennett, 1987; Angilletta et al, 2006); (2) P. tenebrosus is capable of attaining high locomotor performance in the field by reaching and maintaining T pref in the field, as has been observed in other species of the genus (Corbalán, Debandi & Kubisch, 2013; Gómez Alés, Acosta & Laspiur, 2017; Vicenzi et al, 2017; Duran, Kubisch & Boretto, 2018); (3) the potential increase in temperature due to global warming will affect locomotor performance of the species, considering the narrow thermal performance breadth observed in other Phymaturus (Bonino et al, 2015a; Gómez Alés et al, 2018; Vicenzi et al, 2019), increasing their vulnerability to extinction. Consequently, we predict that the T o for locomotor performance will be included within the thermal preference range of the species, that P. tenebrosus is an efficient thermoregulator like other species of the genus, and that under a global warming scenario, locomotor performance will decrease, threatening the viability of the species.…”

Section: Introductionmentioning

confidence: 91%

Potential benefits from global warming to the thermal biology and locomotor performance of an endangered Patagonian lizard

Cabezas-Cartes¹,

Fernández²,

Duran³

et al. 2019

PeerJ

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Global warming can significantly affect many aspects of the biology of animal species, including their thermal physiology and physiological performance. Thermal performance curves provide a heuristic model to evaluate the impacts of temperature on the ecophysiology of ectotherms. When integrated with other thermal biology parameters, they can be used to predict the impacts of climate change on individual fitness and population viability. In this study, we combine holistic measures of thermal physiology and the thermal sensitivity of locomotor performance with environmental temperatures measured at fine scale to estimate the vulnerability to global warming of the endangered Patagonian lizard Phymaturus tenebrosus. Our results indicate that this lizard exhibits its preferred temperatures and maximum locomotor performance at higher temperatures than the mean temperature it currently experiences in its habitat. In addition, it exhibits a low effectiveness of thermoregulation, being a poor thermoregulator. In view of the results obtained, we suggest that the climatic conditions of Patagonia may be advantageous for P. tenebrosus to survive future global warming, since its thermal physiology and locomotor performance may improve under increasing in environmental temperatures in its habitat.

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Section: Introductionmentioning

confidence: 91%

Potential benefits from global warming to the thermal biology and locomotor performance of an endangered Patagonian lizard

Cabezas-Cartes¹,

Fernández²,

Duran³

et al. 2019

PeerJ

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“…For example, thermoregulatory strategies of Liolaemus species may rely on both air and substrate temperature [22,23], and also swapping between shaded areas and sites exposed to direct sunlight [24]. Moreover, it has been debated whether the body (field) temperature of this group of lizards is driven by a labile evolution in which the environmental thermal gradient causes a directional selection, or it responds to the phylogeny and thus thermal physiology is evolutionarily conservative [22,23,24,25,26,27,28].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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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 (T b), preferred temperature (T pref), critical thermal maximum (CT max), and critical thermal minimum (CT min)-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 (CT max and T b) are influenced by environmental heterogeneity, which brings changes on the thermoregulatory behavior. Other parameters (T pref and CT min), may be also influenced by phylogenetic constraints. Moreover, the fluctuating air temperature (T air) as well as the operative temperatures (T e) 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.

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“…El sexo tampoco influyó en el comportamiento heliotérmico, como lo observado en los lagartos L. tandiliensis (Stellatelli et al, 2018). Por otro lado, la temperatura corporal en L. chacoensis no se relacionó con LHC; como lo mencionado en otras especies de Liolaemus (Carothers, Fox, Marquet, & Jaksic, 1997;Labra et al, 2008;Pincheira-Donoso, Hodgson, & Tregenza, 2008;Gómez Alés, Acosta, & Laspiur, 2017). Estas evidencias apoyan lo propuesto por Pincheira-Donoso et al (2008), que establecen que el tamaño corporal en Liolaemus no está relacionado con la termorregulación.…”

Section: Discussionunclassified

Termorregulación de la lagartija Liolaemus chacoensis (Squamata: Liolaemidae) durante su ciclo reproductivo, en el Chaco occidental, Argentina

Astudillo¹

2019

RBT

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La capacidad de muchas especies de lagartos para disminuir su costo de mantenimiento durante los cambios de temperaturas ambientales está probablemente relacionada con su éxito para hacer frente a un ambiente fluctuante. En Argentina, Liolaemus chacoensis es una especie conocida en el sector del Chaco Árido de Llanura, esta región es un área subtropical que presenta diferencias estacionales bien marcadas y las temperaturas medias ambientales son cada vez más variables. El objetivo de este trabajo fue determinar cómo influyen las temperaturas ambientales en la termorregulación de L. chacoensis y conocer si la población responde como una unidad o existen diferencias entre el sexo y la estación. Los individuos fueron capturados a mano en el sector Sur de Valle Fértil, provincia de San Juan. Se capturaron un total de 44 individuos adultos durante los meses de noviembre 2014 (primavera), febrero 2015 (verano) y marzo 2015 (otoño). En primavera, se capturaron 17 individuos (9 hembras y 8 machos); para el verano fueron 10 individuos en total (5 hembras, 5 machos) y en otoño 17 lagartos (7 hembras, 10 machos). Se registró la temperatura corporal (Tc), la temperatura del sustrato (Ts) y del aire (Ta) y se evaluó la disponibilidad térmica del hábitat desde la perspectiva de un organismo no termorregulador, utilizando modelos biofísicos. En laboratorio, se estudió la temperatura seleccionada (Tsel). Luego se calculó el índice de eficiencia termorregulatoria (E). La temperatura corporal de campo en otoño fue 3.86 °C menor con respecto a primavera y 2.84 °C inferior a la de verano, lo cual se relaciona con la dependencia encontrada entre Tc y Ta. La media de Tsel entre las estaciones fue similar (P > 0.05). El índice de eficiencia termorregulatoria indica que L. chacoensis se comportaría como un termorregulador moderado (E = 0.33), excepto para el otoño (E = 0.01), donde se observa que tienden a una termorregulación nula. Al analizar los diferentes segmentos poblacionales de L. chacoensis se observó una marcada heterogeneidad estacional en la biología térmica y la selección activa de los micrositios parece ser un mecanismo responsable del mantenimiento de la temperatura corporal de la especie.

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Thermal biology in two syntopic lizards, Phymaturus extrilidus and Liolaemus parvus, in the Puna region of Argentina

Cited by 28 publications

References 76 publications

Potential benefits from global warming to the thermal biology and locomotor performance of an endangered Patagonian lizard

Potential benefits from global warming to the thermal biology and locomotor performance of an endangered Patagonian lizard

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

Termorregulación de la lagartija Liolaemus chacoensis (Squamata: Liolaemidae) durante su ciclo reproductivo, en el Chaco occidental, Argentina

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