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| 作者 | Tao, Shan-Dar;Toda, Mamoru |
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| 出版日期 | 202602 |
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| 著作名稱 | Variation in cold tolerance among three house geckos with tropical origins at the northernmost range limitations in the Ryukyu Archipelago, Japan
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| 刊名 | Current Herpetology |
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| 卷 | 45 |
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| 期 | 1 |
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| 頁數 | 78-86 |
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| 被收錄索引 | SCI;SCI |
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| 主題 | 動物;動物 |
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| 關鍵字 | Behavioral thermoregulation; Biological invasion; Cold tolerance; Gehyra mutilata; Hemidactylus bowringii; Hemidactylus frenatus |
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| 摘要 | For tropical ectotherms invading temperate regions, cold stress
imposes significant negative impacts on their activity and survival. A previous
study demonstrated that the recent northward range expansion of
Hemidactylus frenatus to Amamioshima Island, Japan, after 2000 was driven
by climate change rather than acquisition of stronger cold tolerance: the
ambient temperature on Amamioshima after 2000 has increased compared to
that on Okinawajima Island prior to 1955, where H. frenatus has long
persisted. Two other gecko species of tropical or subtropical origin, H.
bowringii and Gehyra mutilata, established populations on Amamioshima
around the 1950s–1960s, suggesting they possess stronger cold tolerance
compared to H. frenatus. To test this hypothesis, we compared cold tolerance
among the Amamioshima populations of these three species, representing the
current northernmost limits of their distributions, through laboratory
experiments. Results showed significant differences in critical thermal
minimum (CTmin) among the three species: G. mutilata exhibited the highest
CTmin (11.35±0.34°C), whereas H. bowringii showed the lowest CTmin
(8.58±0.40°C) and H. frenatus exhibited intermediate values (10.36±0.55°C).
These findings suggest that G. mutilata persists in Amamioshima via
behavioral thermoregulation, most likely relying on anthropogenic heat
sources to survive the cold winter there. In contrast, H. bowringii may have
stronger cold tolerance inherently or acquired locally, allowing this species to
spread across Amamioshima in the 1960s. Rising ambient temperatures with
climate change after 2000 enabled H. frenatus to establish a stable population
on this northernmost island. |
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| DOI | https://doi.org/10.5358/hsj.45.78 |
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| 系統號 | NO000007769 |
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