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首页> 外文期刊>Journal of Comparative Physiology, B. Biochemical, Systemic, and Environmental Physiology >The effect of temperature on digestive and assimilation efficiency, gut passage time and appetite in an ambush foraging lizard, Cordylus melanotus melanotus
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The effect of temperature on digestive and assimilation efficiency, gut passage time and appetite in an ambush foraging lizard, Cordylus melanotus melanotus

机译：温度对伏击觅食蜥蜴黑腹冬虫的消化和消化效率，肠道通过时间和食欲的影响

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摘要

In ectotherms, an increase in body temperature increases metabolic rate and may increase rates of digestive processes. We measured the thermal dependence of the apparent digestive and apparent assimilation efficiencies (ADE and AAE), gut passage time (GP) and appetite in Cordylus melanotus melanotus, a medium sized Crag Lizard, which is endemic to South Africa. Trials were conducted at 20, 22, 25, 30, 32 and 35degreesC under controlled conditions. Trials lasted 14 days, during which, lizards were fed ca. 1 g meal-worms per day. Glass beads were used as markers to determine GP at the beginning and end of trials. Faeces and urates were collected daily and oven dried at 50degreesC. The energy content of egested matter was then measured using bomb calorimetry. ADE and AAE were not affected by temperature for either males or females. The mean +/- SE ADE and AAE were 94.4+/-0.3% and 87.2+/-0.6%, respectively. GP was not significantly different between males and females at any temperature, but decreased significantly with increasing temperature. Appetite was significantly different between the different temperatures measured. The decrease of gut passage time with increasing temperature was expected, since the digestive and assimilation efficiencies are similar over the range of temperatures tested. Lizards are thus assimilating a similar proportion of ingested energy, but at faster rates at higher temperatures. The results indicate that the digestive physiology of this species results in maximum energy gain per meal in environments where food is scarce.
机译：在外热中，体温升高会增加代谢率，并可能增加消化过程的速率。我们测量了Cordylus melanotus melanotus（一种中型C蜥蜴）的表观消化和表观吸收效率（ADE和AAE），肠道通过时间（GP）和食欲的热依赖性，该蜥蜴是南非特有的。在受控条件下于20、22、25、30、32和35℃进行试验。试验持续了14天，在此期间，蜥蜴被喂食了约20天。每天1克餐虫。在试验开始和结束时，将玻璃珠用作标记物以确定GP。每天收集粪便和尿酸盐，并在50℃下烘干。然后使用炸弹量热法测量被割出物的能量含量。男性和女性的ADE和AAE均不受温度影响。平均+/- SE ADE和AAE分别为94.4 +/- 0.3％和87.2 +/- 0.6％。男性和女性在任何温度下的GP均无显着差异，但随着温度的升高而显着下降。在所测量的不同温度之间，食欲明显不同。由于消化和吸收效率在所测试的温度范围内相似，因此预计肠道通过时间会随着温度的升高而减少。因此，蜥蜴吸收了相似比例的摄入能量，但在较高温度下吸收速率更快。结果表明，在缺乏食物的环境中，该物种的消化生理学导致每餐最大能量获取。

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