Effects of dehydration on thermoregulatory behavior and thermal tolerance limits of Rana catesbeiana ( )

Guevara-Molina, Estefany Carolíne; Gomes, Fernando Ribeiro; Camacho, Agustín

doi:10.1016/j.jtherbio.2020.102721

Cited by 21 publications

(38 citation statements)

References 66 publications

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“…As wet skin ectotherms, hydration level can also influence the temperatures tolerated and selected by individuals for thermoregulation in their habitats [55][56][57][58]. This has been observed for other frog species (e. g. Rana catesbeiana; [22]), with individuals decreasing their VT Max in response to dehydration, and some even losing their behavioral response to the VT Max . Even though we controlled for hydration when measuring VT Max , individuals in the wild rarely are at their optimal hydration level and thus desiccation might influence local frog distribution [59].…”

Section: Plos Onementioning

confidence: 84%

“…The box had a movable lid, allowing the animal to easily leave the box when needed. A thin thermocouple (type-T, Omega1) was located in the inguinal region of each individual to record its body temperature during the heating [22]. Another type-T thermocouple was placed inside (on the surface) of the box to record heating rate of individuals.…”

Section: Measurements Of the Voluntary Thermal Maximum (Vt Max )mentioning

confidence: 99%

“…Another type-T thermocouple was placed inside (on the surface) of the box to record heating rate of individuals. A dimmer previously connected to the box allowed to control that its temperature not exceeded 5-6˚C the temperature of the individual, allowing the thermoregulation of individuals, and avoided thermal shock and/or a premature exit of the box by the frog (i. e. before VT Max is reached; [22]). The thermocouples were calibrated and connected to a FieldLogger PicoLog TC-08 to record temperature data every 10 seconds.…”

Section: Measurements Of the Voluntary Thermal Maximum (Vt Max )mentioning

confidence: 99%

“…Regarding the lower VT Max values in the nocturnal period for P. nattereri, this result warrants future studies exploring variation in behavioral thermal tolerances in diurnal and nocturnal species in both periods of the day. Indeed, a higher VT Max during the day could reflect physiological adjustment of its thermal safety margin (see [22]), thus helping to protect the frog from extreme, potentially deleterious temperatures.…”

Section: Plos Onementioning

confidence: 99%

“…Behavioral thermal tolerances can be influenced by factors such as reproductive status, sex, photoperiod, and hydration state [18,22]. Additionally, thermal tolerances such as the VT Max might decrease with body size: due to thermal inertia, larger animals might have slower heating and cooling rates than small animals, which increases the exposed time to stressful thermal conditions [23,24].…”

Section: Introductionmentioning

confidence: 99%

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Does behavioral thermal tolerance predict distribution pattern and habitat use in two sympatric Neotropical frogs?

Díaz‐Ricaurte¹,

Serrano²,

Guevara-Molina³

et al. 2020

PLoS ONE

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Environmental temperatures are a major constraint on ectotherm abundance, influencing their distribution and natural history. Comparing thermal tolerances with environmental temperatures is a simple way to estimate thermal constraints on species distributions. We investigate the potential effects of behavioral thermal tolerance (i. e. Voluntary Thermal Maximum, VT Max) on anuran local (habitat) and regional distribution patterns and associated behavioral responses. We tested for differences in Voluntary Thermal Maximum (VT Max) of two sympatric frog species of the genus Physalaemus in the Cerrado. We mapped the difference between VT Max and maximum daily temperature (VT Max-ET Max) and compared the abundance in open and non-open habitats for both species. Physalaemus nattereri had a significantly higher VT Max than P. cuvieri. For P. nattereri, the model including only period of day was chosen as the best to explain variation in the VT Max while for P. cuvieri, the null model was the best model. At the regional scale, VTMax-ET Max values were significantly different between species, with P. nattereri mostly found in localities with maximum temperatures below its VT Max and P. cuvieri showing the reverse pattern. Regarding habitat use, P. cuvieri was in general more abundant in open than in non-open habitats, whereas P. nattereri was similarly abundant in these habitats. This difference seems to reflect their distribution patterns: P. cuvieri is more abundant in open and warmer habitats and occurs mostly in warmer areas in relation to its VT Max , whereas P. nattereri tends to be abundant in both open and non-open (and cooler) areas and occurs mostly in cooler areas regarding its VT Max. Our study indicates that differences in behavioral thermal tolerance may be important in shaping local and regional distribution patterns. Furthermore, small-scale habitat use might reveal a link between behavioral thermal tolerance and natural history strategies.

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Section: Plos Onementioning

confidence: 84%

Section: Measurements Of the Voluntary Thermal Maximum (Vt Max )mentioning

confidence: 99%

Section: Measurements Of the Voluntary Thermal Maximum (Vt Max )mentioning

confidence: 99%

Section: Plos Onementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Does behavioral thermal tolerance predict distribution pattern and habitat use in two sympatric Neotropical frogs?

Díaz‐Ricaurte¹,

Serrano²,

Guevara-Molina³

et al. 2020

PLoS ONE

Self Cite

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Short‐term captivity does not affect immediate voluntary thermal maximum of a neotropical pitviper: Implications for behavioral thermoregulation

Díaz‐Ricaurte

Serrano

2020

J Exp Zool Pt A

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Ectotherms depend on temperature to maintain their physiological functions and through behavioral changes, they can avoid overheating in their habitats. The voluntary thermal maximum (VTMax) represents the maximum temperature tolerated by individuals before actively moving to a colder place. However, if and how VTMax might change after capture and in captivity remains understudied. We investigate if measurements taken in captivity are a good proxy for thermal tolerance of wild individuals. As thermal history has been shown to affect behavioral response and physiological parameters, herein we hypothesized that VTMax of the neotropical viper Bothrops pauloensis varies throughout the captivity period. We measured the VTMax of individuals immediately after capture and in three trials during a short‐term period in captivity. Measurements were done by recording their body temperature at which they exited a heating box experimental setup. In contrast to our hypothesis, the VTMax was not significantly affected by time in captivity but there was interindividual variation. There were also no significant differences between field and captivity measurements, in spite of the small effect size. Our results indicate that the VTMax of this snake population is not affected by a short‐term captivity period. Furthermore, an invariant VTMax might indicate low phenotypic plasticity, as individuals do not appear to adjust their tolerance to short‐term exposure to higher temperatures and potential vulnerability to threats such as global warming. We expect that our results can contribute to understanding the effect of captivity on thermal tolerance in neotropical squamates, allowing for insights into their thermal physiology and ecology.

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Thermal sensitivity of Bullfrog's immune response kept at different temperatures

et al. 2020

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Climate change and emerging infectious diseases are often described as the main factors associated with the worldwide amphibian population decline. In this context, rising temperatures due to global warming might act as a chronic stressor for many amphibians, leading to immunosuppression. This study aimed to characterize the thermal sensitivity of the Bullfrog's (Lithobates catesbeianus) immune response and the effect of acclimation at different temperatures on it. Plasma bacterial killing ability (BKA) and phagocytosis activity of blood leukocytes were measured at different incubation temperatures (5–40°C) in individuals kept at 28°C and 34°C. First, all individuals were held under 28°C and sampled on the 16th day. Subsequently, one group was kept at 28°, and the other one was transferred to 34°C. Both groups were sampled at 83 and 106 days of maintenance. Plasma corticosterone (CORT) and testosterone (T) were assessed to evidence thermal stress and possible endocrine correlates of immune changes over time. The incubation temperature affected BKA both on animals kept at 28°C and 34°C, with maximum values at lower temperatures (5–20°C). Phagocytosis activity was constant over the range of assay temperatures. Immune and endocrine variables decreased over time in both thermal regimes, but frogs maintained at 34°C showed lower T and immunosuppression, evidencing stress response. Therefore, exposure to high temperatures might decrease immune function in bullfrogs due to chronic stress response and by exposition to temperatures of lower performance according to the thermal sensitivity curve, which might increase vulnerability to diseases in this anuran species.

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Effects of dehydration on thermoregulatory behavior and thermal tolerance limits of Rana catesbeiana ( )

Cited by 21 publications

References 66 publications

Does behavioral thermal tolerance predict distribution pattern and habitat use in two sympatric Neotropical frogs?

Does behavioral thermal tolerance predict distribution pattern and habitat use in two sympatric Neotropical frogs?

Short‐term captivity does not affect immediate voluntary thermal maximum of a neotropical pitviper: Implications for behavioral thermoregulation

Thermal sensitivity of Bullfrog's immune response kept at different temperatures

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