The postprandial increment of metabolism, often referred to as specific dynamic action (SDA), encompasses the summed costs of meal ingestion, digestion, absorption, and assimilation. Different SDA parameters, such as its magnitude, duration, and relative cost, are affected by a diverse set of environmental and physiological determinants, including meal size and body temperature. While the influence of these variables has been thoroughly examined in most ectothermic vertebrate groups, few studies have focused on the determinants and consequences of the SDA response in anuran amphibians. Thus, we examined the effects of meal size and body temperature on the SDA response of a Neotropical frog, Leptodactylus latrans, by measuring the rates of oxygen consumption of frogs while fasting and after being fed meals of different sizes at different temperatures. SDA lasted from 3 to 5 days and increased with meal size for frogs fed meals equivalent to 5–15% of their body mass. SDA cost was not affected by meal size and averaged 14.6% of the caloric content of the meal. Temperature increment was accompanied by proportional increases in metabolic rate and shorter SDA duration. The relative SDA cost averaged 14.8% of the meal caloric content at 20°C and 25°C, but increased to 23.5% at 30°C. Our results indicate that meal size imposes no physiological or energetic constraint to L. latrans feeding. Digestion at temperatures near the thermal preference of the species seems to optimize energetic return, whereas the shortening of SDA duration at higher temperatures may provide significant ecological advantages.

中文翻译：

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温度和进餐量对Latrans Leptodactylus latrans（Anura，Leptodactylidae）餐后代谢反应的影响。

餐后新陈代谢的增加（通常称为特定动态作用（SDA））涵盖了进餐，消化，吸收和同化的总费用。不同的SDA参数（例如其大小，持续时间和相对成本）受多种环境和生理决定因素（包括进餐量和体温）的影响。尽管这些变量的影响已在大多数外热脊椎动物组中进行了全面研究，但很少有研究集中在无尾两栖动物中SDA响应的决定因素和后果上。因此，我们研究了进食量和体温对新热带青蛙Leptodactylus latrans的SDA反应的影响。通过测量青蛙在禁食时和在不同温度下喂食不同大小的食物后的耗氧率。SDA持续3到5天，并随着进食相当于其体重5–15％的青蛙的进食量增加。SDA成本不受进餐量的影响，平均为进餐热量的14.6％。温度升高伴随着代谢率的增加和SDA时间的缩短。在20°C和25°C下，相对SDA成本平均为餐时卡路里含量的14.8％，但在30°C时增加至23.5％。我们的研究结果表明，进餐量不会对L. latrans产生任何生理或能量上的约束喂养。在接近物种热偏好的温度下消化似乎可以优化能量返回，而在较高温度下缩短SDA持续时间可能会提供明显的生态优势。