Thermal ecology of montane Atelopus (Anura: Bufonidae): A study of intrageneric diversity

Solano, Luis Alberto Rueda; Navas, Carlos A.; Carvajalino-Fernández, Juan M.; Amézquita, Adolfo

doi:10.1016/j.jtherbio.2016.04.007

Cited by 14 publications

(6 citation statements)

References 28 publications

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“…The climate variability hypothesis (CVH; Janzen, 1967;Stevens, 1989) predicts that organisms should have wide thermal tolerance breadths in environments with wide temperature ranges, such as in tropical mountain areas. As a result, tropical high elevation amphibian species appear to have greater warming tolerance and wider thermal tolerance breadths than amphibians living in environments with relatively narrow temperature ranges (Catenazzi et al, 2014;Navas, 1996aNavas, , 1996bNavas et al, 2013;Rueda-Solano et al, 2016;von May et al, 2017). Compared to lower-elevation species in closed-canopy habitats, high elevation ectotherms appear to be more buffered from climatic warming, as their upper critical thermal limits (i.e., CT max ) are farther away from the maximum temperatures that they regularly experience in the environment (Catenazzi et al, 2014;von May et al, 2017).…”

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confidence: 99%

Thermal adaptations to extreme freeze–thaw cycles in the high tropical Andes

et al. 2020

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Temperature plays a key role in the biology of ectotherms, including anurans, which are found at higher elevations in the tropics than anywhere in the temperate zone. High elevation tropical environments are characterized by extreme daily thermal fluctuation including high daily maxima and nightly freezing. Our study investigated the contrasting operative temperatures of the anurans Telmatobius marmoratus and Pleurodema marmoratum in different environmental contexts at the same elevation and biome above 5,200 m. Telmatobius marmoratus avoids extremes of daily temperature fluctuation by utilizing thermally buffered aquatic habitat at all life stages, with minimal operative temperature variation (range: 4.6–8.0°C). Pleurodema marmoratum, in contrast, experienced operative temperatures from −3.5 to 44°C and has one of the widest thermal breadths reported for any tropical frog, from >32°C (critical thermal maximum) to surviving freezing periods of 1 and 6 hr down to −3.0°C. Our findings expand experimental evidence of frost tolerance in amphibians to the widespread Neotropical family Leptodactylidae, the first such evidence of frost tolerance in a tropical amphibian. Our study identifies three strategies (wide thermal tolerance breadth, use of buffered microhabitats, and behavioral thermoregulation), which allow these tropical frogs to withstand the current wide daily thermal fluctuation above 5,000 m.a.s.l. and which may help them adapt to future climatic changes. Abstract in Spanish is available with online material

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confidence: 99%

Thermal adaptations to extreme freeze–thaw cycles in the high tropical Andes

et al. 2020

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“…These results are similar to those observed in the work of Sanabria et al (2003), where the variables environmental temperature, solar radiation and wind speed showed a significant effect on body temperature. In contrast, the studies of Navas et al (2013) and Rueda-Solano et al (2016) found an association between body temperature and altitude gradient.…”

Section: Climate Variables and Agar Modelsmentioning

confidence: 68%

Infiriendo el efecto de factores abióticos sobre la temperatura corporal y pérdida de agua sobre modelos de agar de la rana sabanera (Dendropsophus molitor) en Cajicá- Cundinamarca

Lugo¹,

Uribe²,

Altamiranda³

et al. 2022

Actual. Biol.

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La alta permeabilidad de la piel representa una restricción fisiológica en anfibios, debido a un mayor riesgo de deshidratación por evapotranspiración en ambientes con menor disponibilidad de agua y mayor temperatura. Dendropsophus molitor es una especie semiacuática con comportamiento de tomar el sol, mecanismo termorregulatorio, necesario para llevar a cabo sus procesos vitales. El objetivo de este trabajo fue evaluar el efecto de las variables ambientales, tipo de microhábitat y color, sobre la temperatura corporal y pérdida de agua en D. molitor. Para esto, se usaron modelos de agar de dos colores, ubicados en dos tipos de microhábitat (húmedo vs. seco), cada uno en dos condiciones de exposición (sol vs. sombra), midiendo el porcentaje de cambio de peso y temperatura corporal. Se realizaron análisis estadísticos como correlación, modelos de efectos lineares mixtos, y el método del factor de inflación de la varianza. Los resultados del estudio mostraron que el punto de rocío, la humedad relativa, la radiación solar, la temperatura del sustrato y el microhábitat, pero no el color de los modelos de agar, tuvieron un efecto significativo sobre el porcentaje de cambio de peso y la temperatura corporal. Ambas variables incrementaron en la condición microhábitat seco y sol, así como en seco y sombra, entre las 12:00 y 16:00 horas. La evapotranspiración está íntimamente relacionada con la radiación y el déficit de presión de vapor, siendo importante para la temperatura corporal del anfibio, debido a que éste se enfría mediante la evapotranspiración del agua a través de su piel. Por último, se sugiere que las variables a nivel del microhábitat son vitales para estas especies, y deberían ser incorporadas en este tipo de estudios.

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“…A disjunct group of species occupies the eastern Amazonian Basin and the Guiana Shield ( Lötters et al, 2011 ). Atelopus are found at elevations ranging from 0 to 4800m ( La Marca et al, 2005 ) and occupy a variety of habitats, including Chocó-Darién moist forests ( Veselý and Batista, 2021 ), treeless high-altitude páramo ( Rueda Solano et al, 2016 ), and lowland Amazonian rainforest ( Jorge et al, 2020a ). Harlequin toads live in riparian areas, with males often staying close to streams and females ranging further into the surrounding areas ( Mcdiarmid, 1971 ).…”

Section: Geographic and Phylogenetic Distribution Of A ...mentioning

confidence: 99%