Altitude and ground brightness explain interpopulation variation in dorsal coloration in a lizard.

IF 2 2区 生物学 Q2 ZOOLOGY
Current Zoology Pub Date : 2024-10-21 eCollection Date: 2025-08-01 DOI:10.1093/cz/zoae065
José J Cuervo, María C Durán-García, Josabel Belliure
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引用次数: 0

Abstract

Non-signaling functions of coloration include thermoregulation (thermal melanism hypothesis), protection against ultraviolet radiation (photoprotection hypothesis), and concealment from predators (crypsis hypothesis). We investigated whether dorsal coloration in 19 populations of spiny-footed lizards, Acanthodactylus erythrurus, across the Iberian Peninsula varies according to these functions. We captured adult males and females in each population and calculated standardized dorsum brightness estimates from photographs. We also calculated standardized ground luminosity estimates and gathered information on latitude, altitude, mean annual temperature, and mean annual solar radiation for each location. Males showed a higher percentage of black coloration and a more contrasted dorsum than females, suggesting different selection pressures on dorsal coloration in both sexes. Furthermore, males showed a darker dorsum and a higher percentage of black coloration at higher altitudes and when the ground was darker. In contrast, females exhibited a darker dorsum only when the ground was darker and a higher percentage of black coloration only at higher altitudes. We also observed that the variation of dorsum luminosity within males and the variation of dorsum luminosity among females within populations were both positively related to the variation of ground luminosity among different points within locations. Latitude, temperature, and solar radiation were not significantly related to dorsal coloration in either sex. Our results support the photoprotection and crypsis hypotheses in males and, to some extent, in females, whereas the thermal melanism hypothesis is weakly supported in both sexes. These findings suggest that there is local adaptation in the dorsal coloration of the spiny-footed lizard.

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海拔和地面亮度解释了蜥蜴背部颜色的种群间差异。
颜色的非信号功能包括体温调节(热黑变假说)、防止紫外线辐射(光保护假说)和躲避捕食者(隐变假说)。我们调查了伊比利亚半岛19个棘足蜥蜴种群的背部颜色是否根据这些功能而变化。我们捕获了每个种群的成年雄性和雌性,并从照片中计算了标准化的背亮度估计值。我们还计算了标准化的地面光度估计,并收集了每个地点的纬度、海拔、年平均温度和年平均太阳辐射的信息。与雌性相比,雄性呈现出更高的黑色比例和更鲜明的背色,这表明两性对背色的选择压力不同。此外,在海拔较高和地面较暗的情况下,雄性的背部颜色较深,黑色的比例较高。相比之下,雌性只有在地面较暗时才会显示出较深的背部,只有在海拔较高的地方才会显示出较高的黑色比例。种群内雄性和雌性背光度的变化均与地点内不同点间地面光度的变化呈正相关。纬度、温度和太阳辐射对雌雄背色的影响不显著。我们的研究结果在一定程度上支持了雄性和雌性的光保护和隐变假说,而热黑变假说在两性中都得到了微弱的支持。这些发现表明,刺足蜥蜴的背部颜色存在局部适应性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Current Zoology
Current Zoology Agricultural and Biological Sciences-Animal Science and Zoology
CiteScore
3.20
自引率
9.10%
发文量
111
审稿时长
6 weeks
期刊介绍: About the Journal Current Zoology (formerly Acta Zoologica Sinica, founded in 1935) is an open access, bimonthly, peer-reviewed international journal of zoology. It publishes review articles and research papers in the fields of ecology, evolution and behaviour. Current Zoology is sponsored by Institute of Zoology, Chinese Academy of Sciences, along with the China Zoological Society.
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