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Post-feeding thermophily in a scorpion is associated with rapid digestion and recovery of maximal nocturnal activity
Journal of Insect Physiology ( IF 2.2 ) Pub Date : 2020-10-10 , DOI: 10.1016/j.jinsphys.2020.104155
Dagan Raviv 1 , Eran Gefen 1
Affiliation  

A postprandial increase in metabolic rate is typical in all studied animal groups. The phenomenon, termed specific dynamic action (SDA), is understudied in terrestrial arthropods, and arachnids in particular. To the best of our knowledge, this is the first report of SDA properties in scorpions, which are temperature-dependent as in other poikilotherms. Metabolic rates of scorpions are low compared with similarly-sized arthropods, and as they often feed on relatively large prey the cost of digestion is expected to be notable. This prompted us to study the extent of SDA and its characteristics in scorpions at two different ecologically-relevant temperatures. We also hypothesized that post-feeding behavioral thermoregulation would reflect benefits to the scorpion energy balance. On average, fed adult Hottentotta judaicus (Buthidae) expressed a 3 °C increase in preferred surface temperature, although we did not find evidence for lower costs of digestion at higher temperatures. However, SDA duration was significantly shorter at 30 compared with 25 °C. Fast processing of their meal at 30 °C was correlated with recovery of elevated nocturnal metabolic rates, which are not digestion-related. This suggests that post-feeding choice of higher temperatures accelerates digestion and recovery of other elevated metabolic states such as locomotion and lower sensory threshold, which may enhance foraging success.



中文翻译:

蝎子的摄食后嗜热与快速消化和最大夜间活动的恢复有关

在所有研究的动物组中,餐后代谢率的增加是典型的。这种被称为特定动力作用 (SDA) 的现象在陆生节肢动物,尤其是蛛形纲动物中尚未得到充分研究。据我们所知,这是蝎子 SDA 特性的第一份报告,与其他变温动物一样,它与温度有关。与类似大小的节肢动物相比,蝎子的代谢率较低,并且由于它们通常以相对较大的猎物为食,因此消化成本预计会很高。这促使我们在两种不同的生态相关温度下研究蝎子中 SDA 的范围及其特征。我们还假设喂食后的行为体温调节会反映蝎子能量平衡的好处。平均而言,喂食成年Hottentotta judaicus(Buthidae) 表示首选表面温度增加了 3 °C,尽管我们没有发现在较高温度下消化成本较低的证据。然而,与 25 °C 相比,SDA 持续时间在 30 时明显更短。在 30 °C 下快速处理他们的膳食与夜间代谢率升高有关,而这与消化无关。这表明,进食后选择较高的温度会加速消化和恢复其他升高的代谢状态,例如运动和较低的感觉阈值,这可能会提高觅食的成功率。

更新日期:2020-10-10
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