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Feeding alters the preferred body temperature of Cururu toads, Rhinella diptycha (Anura, Bufonidae).
Comparative Biochemistry and Physiology A: Molecular & Integrative Physiology ( IF 2.3 ) Pub Date : 2020-07-22 , DOI: 10.1016/j.cbpa.2020.110771
Amanda C Clemente 1 , Luis M Senzano 1 , Rodrigo S B Gavira 2 , Denis V Andrade 1
Affiliation  

Ectothermic organisms depend primarily on external heat sources and behavioural adjustments to regulate body temperature. Under controlled conditions, in a thermal gradient, body temperature often clusters around a more or less defined range of preferred body temperatures (Tpref). However, Tpref may be modified in response to environmental parameters and/or physiological state. For example, meal ingestion is sometimes followed by a post-prandial thermophilic response leading to a transient increment in Tpref. Although thought to optimize digestive processes, its occurrence, magnitude, and possible determinants remains scarcely documented for anuran amphibians. Herein, we investigated whether the Cururu toad, Rhinella diptycha, exhibits a post-prandial thermophilic response by monitoring the body temperature of fasting and fed toads while they were maintained in a thermal gradient. We found that the toads' Tpref increased by about 13% from day 2 to 4 after feeding, in comparison with the Tpref recorded under fasting. Also, fed animals exhibited a broader range for Tpref at days 2 and 3 post-prandial, which reflects a greater level of locomotor activity compared to fasting individuals. We conclude that R. diptycha is capable to exhibit a post-prandial thermophilic response under the controlled conditions of a thermal gradient. Although this thermoregulatory adjustment is thought to optimize meal digestion yielding important energetic and ecological benefits, its occurrence in anuran amphibians in nature remains uncertain.



中文翻译:

进食会改变Cururu蟾蜍(Rinellla diptycha)(Anura,Bufonidae)的首选体温。

放热生物主要依靠外部热源和行为调节来调节体温。在受控条件下,在热梯度下,人体温度通常会在或多或少的最佳人体温度范围(T pref)附近聚集。然而,T pref可响应于环境参数和/或生理状态而被修饰。例如,进餐后有时会出现餐后嗜热反应,导致T pref瞬时增加。尽管被认为可以优化消化过程,但对于无水两栖动物,其发生,大小和可能的决定因素仍然鲜有记载。在这里,我们调查了Cururu蟾蜍,莱茵兰双翅目通过监测禁食和喂养的蟾蜍在保持温度梯度时的体温来显示餐后的嗜热反应。我们发现,与禁食时记录的T pref相比,蟾蜍的T pref从进食后的第2天到第4天增加了约13%。而且,进食的动物在餐后第2天和第3天表现出更广泛的T pref范围,与空腹个体相比,这反映出更大的运动活动水平。我们得出结论,R。diptycha能够在受控的温度梯度条件下表现出餐后的嗜热响应。尽管人们认为这种体温调节可以优化膳食消化,从而产生重要的能量和生态效益,但其在自然无水两栖动物中的发生仍不确定。

更新日期:2020-07-29
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