受到威胁的本地蜥蜴和入侵蜥蜴物种之间的温度调节比较

IF 1.1 4区 生物学 Q3 ZOOLOGY Herpetological Journal Pub Date : 2021-04-01 DOI:10.33256/HJ31.2.7076
Yole Caruso, Daniele Macale, L. Luiselli, L. Vignoli
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引用次数: 1

摘要

蜥蜴的体温调节是昂贵的,而且在很大程度上是行为性的。拉芬尼蜥蜴是埃奥利亚群岛(意大利南部)少数几个岛屿的特有蜥蜴,是欧洲最受威胁的蜥蜴之一,其生存也受到威胁,这也是由于同类西西里蜥蜴的存在,西西里蜥蜴是一种成功的入侵者,其特征是行为可塑性、调节体温的有效性和准确性。我们通过分析(i)标准热条件下的加热速率,以及(ii)蜥蜴结束沿热梯度晒太阳的温度(Tfinal),测试了这两个物种之间的体温调节行为是否存在差异。总的来说,我们发现这两种蜥蜴之间的行为差异(即P.siculus表现出较低的Tfinal),尽管两种蜥蜴的加热速率相当,并且在相同的热条件下温度调节。入侵的干燥P.siculus具有较低的Tfinal,并且由于不同物种之间的加热速率相似,它比本地的拉菲花更少的时间晒太阳。我们推测,在恶劣的岛屿环境中,观察到的热生态差异可能为P.siculus提供了选择性优势。
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Thermoregulation comparisons between a threatened native and an invasive lizard species
Lizard thermoregulation is costly and is largely behavioural. Podarcis raffonei, endemic of few islets of the Aeolian archipelago (southern Italy), is one of the most threatened lizards in Europe, its survival being under threat also due to the presence of the congeneric P. siculus, a successful invader characterised by behavioural plasticity and effectiveness and precision at regulating body temperature (Tb). We tested whether thermoregulation behaviour diverges between the two species by analysing (i) the heating rates under a standard thermal condition, and (ii) the temperature at which lizards ended basking (Tfinal) along a thermal gradient. Overall, we found behavioural differences between the two lizards (i.e. P. siculus exhibited lower Tfinal), although both species had comparable heating rates and thermoregulated in the same thermal conditions. The invasive P. siculus had lower Tfinal and, since heating rates were similar between species, it expended less time basking than native P. raffonei. We speculate that the observed thermal ecology differences could provide a selective advantage to P. siculus in the harsh island environment.
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来源期刊
Herpetological Journal
Herpetological Journal 生物-动物学
CiteScore
2.40
自引率
10.00%
发文量
25
审稿时长
>12 weeks
期刊介绍: The Herpetological Journal is the Society''s prestigious quarterly scientific journal.
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