The reptiles of Tinhosa Grande islet (Gulf of Guinea): A taxonomic update and the role of Quaternary sea level fluctuations in their diversification

IF 0.8 4区 生物学 Q3 ZOOLOGY African Journal of Herpetology Pub Date : 2020-07-02 DOI:10.1080/21564574.2020.1832151
L. Ceríaco, Justin M. Bernstein, A. C. Sousa, M. P. Marques, A. Bauer, S. Norder
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引用次数: 2

Abstract

ABSTRACT The reptile fauna of Tinhosa Grande islet, Gulf of Guinea, comprises an endemic skink, Trachylepis adamastor, and an unidentified species of gecko of the genus Hemidactylus. Until recently, no molecular data were available for either species, impeding their phylogenetic placement. However, due to several synapomorphic characters, it was suggested that the Tinhosa Grande population would be related to the congeners of the neighbouring islands of Príncipe and São Tomé. In a recent survey of Tinhosa Grande islet we collected fresh material of both species, allowing us to examine their phylogenetic relationships to the other members of their respective genera occurring on the neighbouring islands using multigene Bayesian and maximum likelihood analyses. In contrast with the morphological results and previous taxonomic allocations, our molecular results suggest that both T. adamastor and the unidentified Hemidactylus sp. are conspecific with their Príncipe counterparts, Trachylepis principensis and Hemidactylus principensis. While today Tinhosa and Príncipe differ strongly in their environmental conditions, we show that the islands have been repeatedly merged into a single landmass as a result of Quaternary sea level fluctuations. We suggest that the repeated fusion of the islands during low sea levels could have impeded the phylogenetic divergence of both populations, while contrasting habitats might have simultaneously promoted some morphological differences.
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几内亚湾Tinhosa Grande岛的爬行动物:分类更新及第四纪海平面波动在其多样化中的作用
几内亚湾Tinhosa Grande岛爬行动物区系包括一种特有的石龙子(Trachylepis adamastor)和一种未确定的半爪壁虎属壁虎。直到最近,还没有这两个物种的分子数据,阻碍了它们的系统发育定位。然而,由于几个近亲特征,人们认为Tinhosa Grande种群可能与邻近岛屿Príncipe和 o tom的同系物有关。在最近对Tinhosa Grande岛的一次调查中,我们收集了这两个物种的新材料,使我们能够使用多基因贝叶斯和最大似然分析来检查它们与邻近岛屿上各自属的其他成员的系统发育关系。与形态学结果和先前的分类划分结果相比,我们的分子结果表明,T. adamastor和未识别的Hemidactylus sp.与Príncipe对应的Trachylepis principensis和Hemidactylus principensis是同源的。虽然今天Tinhosa和Príncipe的环境条件有很大的不同,但我们表明,由于第四纪海平面的波动,这些岛屿已经多次合并成一个单一的大陆。我们认为,低海平面时期岛屿的反复融合可能阻碍了两个种群的系统发育分化,而不同的栖息地可能同时促进了一些形态差异。
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来源期刊
CiteScore
3.00
自引率
6.70%
发文量
15
审稿时长
>12 weeks
期刊介绍: African Journal of Herpetology (AJH) serves as an outlet for original research on the biology of African amphibians and reptiles. AJH is an interdisciplinary journal that publishes original articles and reviews from diverse fields and disciplines, such as conservation, phylogenetics, evolution, systematics, performance, physiology, ecology, behavioural ecology, ethology, and morphology. The Journal publishes two issues a year. There are no page charges .
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