Variation of thermal parameters in two different color morphs of a diurnal poison toad, Melanophryniscus rubriventris (Anura: Bufonidae)

Sanabria, Eduardo Alfredo; Vaira, Marcos; Quiroga, Lorena B.; Akmentins, Mauricio Sebastián; Pereyra, Laura

doi:10.1016/j.jtherbio.2014.01.005

Cited by 15 publications

(8 citation statements)

References 24 publications

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“…El comportamiento termoconformador ha sido explicado como una estrategia de los anfibios para evitar la pérdida de agua y mantener su piel húmeda y permeable, lo que resulta particularmente importante en salamandras terrestres de la familia Plethodontidae (que no presentan pulmones) para poder realizar el intercambio gaseoso a través de la piel (Feder, 1976(Feder, , 1983. También, con el propósito de ahorrar tiempo y energía en la búsqueda innecesaria de microhábitat que no ofrecen oportunidades para termorregular (Oromí et al, 2010;Sanabria et al, 2011), que pueden ser utilizados en otras actividades como la alimentación, búsqueda de refugios, reproducción y crecimiento (Sanabria et al, 2014). Específicamente, para el caso de B. ramosi, es posible que la poca variación térmica de su hábitat sea la principal limitante para termorregular durante su actividad nocturna, ya que en términos de balance de agua la humedad relativa siempre se mantuvo por encima del 85% en el lugar de estudio.…”

Section: Discussionunclassified

Dependencia térmica de la salamandra endémica de Colombia Bolitoglossa ramosi (Caudata, Plethodontidae)

Cruz

Galindo

Bernal

2016

Iheringia, Sér. Zool.

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ABSTRACT. Thermal dependence of the Colombian endemic salamander Bolitoglossa ramosi (Caudata, Plethodontidae). Environmental temperature is a determining factor in the physiological and behavioral processes of amphibians because they are ectotherms and consequently depend on external heat sources to achieve optimal body temperatures. The aim of this study was to determine the thermal dependence of the Colombian endemic salamander Bolitoglossa ramosi Brame & Wake, 1972 with respect to the air and substrate temperatures. Field samples were carried out in the municipality of Líbano, Tolima, Colombia, between 18:00 and 24:00 hours, in April and May 2015. 34 individuals were captured and for each salamander it was recorded: the body temperature, body mass and body length. The substrate and air temperatures were also measured in the place where the animals were found. Body temperature of the individuals had a mean of 18.3±0.55°C, showing a positive and signifi cant relationship to the substrate and air temperatures, which demonstrates that the species is thermoconformer. Furthermore, the body temperature showed a higher thermal dependence on the substrate than the air temperature indicating that B. ramosi presents a tigmothermal regulation. Finally, the body temperature was not related to body length or body mass. This information is useful for understanding the thermal biology of the species and the possible physiological responses to the increase in environmental temperatures.KEYWORDS. Amphibian, conservation, ectotherms, physiology, thermal biology.RESUMEN. La temperatura ambiental es un factor determinante en los procesos fi siológicos y comportamentales de los anfi bios ya que son ectotérmos y consecuentemente dependen de una fuente de calor externa para alcanzar su temperatura corporal óptima. El objetivo de este trabajo fue determinar la dependencia térmica de la salamandra endémica de Colombia Bolitoglossa ramosi Brame & Wake, 1972 con respecto a las temperaturas del aire y del sustrato. Para esto se realizaron diferentes muestreos en el municipio de Líbano, Tolima, Colombia, entre las 18:00 y las 24:00 horas, en Abril y Mayo de 2015. Allí se capturaron 34 individuos a los cuales se les registró directamente en campo: la temperatura corporal, la masa corporal y la longitud corporal. También, se midió la temperatura del sustrato y la temperatura del aire en el lugar donde fue encontrado el animal. La temperatura corporal de los individuos tuvo una media de 18.3±0.55°C, mostrando una relación positiva y signifi cativa con la temperatura del sustrato y la temperatura del aire, lo que demuestra que la especie es termoconformadora. Además, la temperatura corporal mostró una dependencia térmica mayor con la temperatura del sustrato que con la del aire, indicando que B. ramosi presenta una regulación tigmotérmica. Finalmente, la temperatura corporal no se relacionó con la longitud corporal ni con la masa corporal. Esta información es importante para el conocimiento de la biología térmica de la especie y las posibles...

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Section: Discussionunclassified

Dependencia térmica de la salamandra endémica de Colombia Bolitoglossa ramosi (Caudata, Plethodontidae)

Cruz

Galindo

Bernal

2016

Iheringia, Sér. Zool.

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“…Our study was performed during mid-winter; a condition that favours thermoconformism due to the lower availability of thermal resources (Huey 1982;Labra et al 2008). This thermoconformism may allow animals to save time and energy for other behaviours (Labra & Vidal 2003, Sanabria et al 2014, such as storing energy for reproduction. We cannot rule out, however, the possibility that during the summer P. thaul is a more active thermoregulator.…”

Section: Discussionmentioning

confidence: 99%

“…For amphibians, however, temperature is not the only factor which modulates their biology; moisture is the other important determinant (Sanabria et al 2014). In fact, the effectiveness of basking behaviour is severely constrained in most anurans due to their limited ability to control evaporative water loss (Carey 1978;Navas et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Thermal Ecology Of Pleurodema thaul (Amphibia: Leptodactylidae)

Iturra-Cid¹,

Vidal²,

Labra

et al. 2014

Gayana (Concepc.)

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The biodiversity of the entire planet is threatened by global warming, and among vertebrates, Amphibia is the taxon most negatively affected by this problem. Amphibians depend on an external heat source to achieve and maintain an adequate body temperature, which has a signifi cant impact on their fi tness. Therefore, an increase in the average environmental temperature will affect, probably in a negative way, the general performance of amphibians. This makes it imperative to increase our scarce knowledge of amphibian thermoregulation. The aim of this work is to contribute to the knowledge of amphibian thermoregulation by studying the winter thermal ecology of one of the most widely distributed species in Chile, Pleurodema thaul. Individuals were collected during the mid-austral winter in Península de Hualpén, which corresponds to the midpoint of the latitudinal range of distribution of P. thaul. In the fi eld and laboratory we recorded body temperature and the substrate and air temperatures. The data indicate that P. thaul is a thermoconformer, as its body temperature varies during the day, following the temperature of the substrate and the air. Pleurodema thaul does not seem to use morphological body properties to facilitate thermoregulation; body temperature was unrelated to the body size or weight of individuals. The fact that during winter P. thaul does not thermoregulate actively constitutes a clear indication that the global warming may have serious effects on this species. KEYWORDS:Anuran, thermobiology, thermoconformism. RESUMENLa biodiversidad de todo el planeta se encuentra amenazada debido a los efectos del calentamiento global, y dentro de los vertebrados, los anfi bios son los más afectados por este problema. Los anfi bios dependen de fuentes externas de calor para alcanzar y mantener una adecuada temperatura corporal, lo cual tiene un impacto signifi cativo en su adecuación biológica. Por lo tanto, un aumento en la temperatura media del ambiente afectará, probablemente en forma negativa, el desempeño general de los anfi bios. Esto hace que sea imperativo incrementar nuestro escaso conocimiento respecto a la termorregulación de anfi bios. El objetivo de este trabajo es contribuir al conocimiento de la termorregulación de estos organismos mediante el estudio de la ecología térmica en invierno de una de las especies de más amplia distribución en Chile, Pleurodema thaul. Los individuos fueron recolectados en invierno en la Península de Hualpén, que corresponde al punto medio del rango latitudinal de distribución de P. thaul. En terreno y en laboratorio se registró la temperatura corporal y las temperaturas de sustrato y el aire. Los datos indican que P. thaul es una especie termoconforme, ya que su temperatura corporal varía durante el día según varía la temperatura del substrato y del aire. Pleurodema thaul no parece utilizar las propiedades morfológicas del cuerpo para facilitar la termorregulación, ya que la temperatura del cuerpo no se relaciona con el tamaño corporal o el peso de los indiv...

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“…Such variation in morph frequency as a function of temperature and/or light conditions has also been well documented (Alho et al., ; Broennimann et al., ; Forsman & Shine, ; Geen & Johnston, ; McLean et al., ; Parkash, Rajpurohit, & Ramniwas, ). Furthermore, several other studies investigating the effect of skin reflectance on thermal traits, such as heating rates and equilibrium temperatures, have also shown strong support for the thermal advantage of colour (Alho et al., ; Forsman, ; Forsman, Ringblom, Civantos, & Ahnesjo, ; Geen & Johnston, ; Sanabria, Vaira, Quiroga, Akmentins, & Pereyra, ; Schultz & Hadley, ; Tanaka, ). For instance, in a large‐scale macroecological study involving 66 species of heliothermic lizards, Clusella‐Trullas et al.…”

Section: Introductionmentioning

confidence: 91%

Avian predation intensity as a driver of clinal variation in colour morph frequency

Matthews

Goulet

Delhey

et al. 2018

Journal of Animal Ecology

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Phenotypic variation provides the framework for natural selection to work upon, enabling adaptive evolution. One of the most discernible manifestations of phenotypic variability is colour variation. When this variation is discrete, genetically based colour pattern morphs occur simultaneously within a population. Why and how colour polymorphisms are maintained is an evolutionary puzzle. Several evolutionary drivers have been hypothesized as influencing clinal patterns of morph frequency, with spatial variation in climate and predation being considered especially important. Despite this, no study has examined both of their roles simultaneously. The aims of this study were to: (a) examine the covariation of physiology, environmental variables and colouration at a local scale; and (b) determine if these factors and their interplay explain broad clinal variation in morph frequency. We used the lizard Liopholis whitii as a model system, as this species displays a discrete, heritable polymorphism for colour pattern (plain-backed, patterned morphs) whose morph frequency varies latitudinally. We measured reflectance, field activity temperatures and microhabitat structure to test for differences in crypsis, thermal biology and microhabitat selection of patterned and plain-backed morphs within a single population where colour morphs occur sympatrically. We then used data from the literature to perform a broad-scale analysis to identify whether these factors also explained the latitudinal variation of morph frequency in this species. At the local scale, plain-backed morphs were found to be less cryptic than patterned morphs while no other differences were detected in terms of thermal biology, dorsal reflectance and microhabitat use. At a broader scale, predation was the most influential factor mediating morph frequency across latitudes. However, the observed pattern of morph frequency is opposite to what the modelling results suggest in that the incidence of the least cryptic morph is highest where predation pressure is most severe. Clinal variation in the level of background matching between morphs or the potential reproductive advantage by the plain-backed morph may, instead, be driving the observed morph frequency. Together, these results provide key insights into the evolution of local adaptation as well as the ecological forces involved in driving the dynamics of colour polymorphism.

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Variation of thermal parameters in two different color morphs of a diurnal poison toad, Melanophryniscus rubriventris (Anura: Bufonidae)

Cited by 15 publications

References 24 publications

Dependencia térmica de la salamandra endémica de Colombia Bolitoglossa ramosi (Caudata, Plethodontidae)

Dependencia térmica de la salamandra endémica de Colombia Bolitoglossa ramosi (Caudata, Plethodontidae)

Thermal Ecology Of Pleurodema thaul (Amphibia: Leptodactylidae)

Avian predation intensity as a driver of clinal variation in colour morph frequency

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