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Shifts in thermal preference of introduced Asian house geckos (Hemidactylus frenatus) in temperate regions of southeastern Australia
Journal of Thermal Biology ( IF 2.7 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.jtherbio.2020.102625
Yingyod Lapwong 1 , Ariya Dejtaradol 2 , Jonathan K Webb 1
Affiliation  

Despite its tropical origin, the Asian house gecko (Hemidactylus frenatus) is currently invading higher latitudes around the world. In this study, we investigated whether the introduced geckos in the subtropical/temperate region of southeastern Australia have shifted their thermal biology to cope with colder temperatures. In the lab, we measured the body temperatures of geckos from Thailand and Australia in a cost-free thermal gradient. Native H. frenatus from Thailand displayed a diel pattern of thermoregulation. Geckos maintained higher body temperatures during mid-afternoon and at dusk but selected cooler temperatures during the night. Introduced geckos showed a similar pattern of thermoregulation, but selected lower body temperatures in summer (mean = 28.9 °C) and winter (mean = 25.5 °C) than native geckos (mean = 31.5 °C). While the Asian house geckos from Thailand did not alter their body temperatures after feeding, their conspecifics from southeastern Australia selected body temperatures that were 1.6-3.1 °C higher after feeding. In conclusion, our study shows that invasive house geckos in Australia have shifted their preferred body temperatures downwards relative to their native conspecifics in Thailand, presumably as a result of plasticity or natural selection. Our findings suggest that these tropical geckos have adapted to colder regions, and thus, they may spread much further than expected for a tropical ectotherm.

中文翻译:

澳大利亚东南部温带地区引进的亚洲壁虎(Hemidactylus frenatus)的热偏好变化

尽管起源于热带,但亚洲壁虎(Hemidactylus frenatus)目前正在入侵世界各地的高纬度地区。在这项研究中,我们调查了澳大利亚东南部亚热带/温带地区引入的壁虎是否已经改变了它们的热生物学以应对较冷的温度。在实验室中,我们以免费的热梯度测量了来自泰国和澳大利亚的壁虎的体温。来自泰国的本地 H. frenatus 显示出一种体温调节模式。壁虎在中午和黄昏时保持较高的体温,但在夜间选择较低的温度。引入的壁虎表现出类似的体温调节模式,但在夏季(平均值 = 28.9 °C)和冬季(平均值 = 25.5 °C)中选择的体温低于原生壁虎(平均值 = 31.5 °C)。虽然来自泰国的亚洲家壁虎在喂食后没有改变体温,但它们来自澳大利亚东南部的同种壁虎在喂食后选择了高 1.6-3.1°C 的体温。总之,我们的研究表明,相对于它们在泰国的本地同类,澳大利亚的侵入性家壁守宫已将其偏好的体温降低,这可能是可塑性或自然选择的结果。我们的研究结果表明,这些热带壁虎已经适应了较冷的地区,因此,它们的传播可能比热带变温动物的预期传播得更远。我们的研究表明,相对于泰国本土同类,澳大利亚的入侵壁虎已经将其偏好的体温降低了,这可能是可塑性或自然选择的结果。我们的研究结果表明,这些热带壁虎已经适应了较冷的地区,因此,它们的传播可能比热带变温动物的预期传播得更远。我们的研究表明,相对于泰国本土同类,澳大利亚的入侵壁虎已经将其偏好的体温降低了,这可能是可塑性或自然选择的结果。我们的研究结果表明,这些热带壁虎已经适应了较冷的地区,因此,它们的传播可能比热带变温动物的预期传播得更远。
更新日期:2020-07-01
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