New Caledonian rovers and the historical biogeography of a hyper-diverse endemic lineage of South Pacific leaf beetles

IF 4.7 1区 农林科学 Q1 ENTOMOLOGY
Leonardo Platania, Anabela Cardoso, Mark Anderson, Martin Fikáček, Jérémy Gauthier, Lars Hendrich, Christian Mille, Yuta Morii, Chris A. M. Reid, Matthias Seidel, Mary Morgan-Richards, Steven A. Trewick, Emmanuel F. A. Toussaint, Jesús Gómez-Zurita
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Abstract

South Pacific archipelagos are central in the biogeographic debate on the relative importance of vicariance and dispersal in shaping the distribution of species. However, each taxonomic group was subject to different processes and histories, and here, we reveal the historical biogeography of the diverse Eumolpinae leaf beetles, widely distributed in the region. Extensive taxon sampling focusing on South Pacific Eumolpinae was used to infer the first molecular phylogeny of the group using three single-copy protein-coding nuclear and two mitochondrial markers. Upon assessing the clade of interest for lineage-specific variation in substitution rates, the age of the most recent common ancestors was estimated using out-group calibration and multi-gamma site models (MGSMs). Biogeographic analyses used standard event-based inferences also incorporating phylogenetic uncertainty. Zealandian Eumolpinae are monophyletic and appear to have split from their global relatives in the transition from the Cretaceous to the Paleogene. Variation in the rates of molecular evolution affected the in-group stem branch, with a significant drop in the substitution rate, and the MGSM correction recovered the crown age of Zealandian Eumolpinae during the Late Eocene–Oligocene transition. Biogeographic inference resolved the origin of the radiation in New Caledonia, favouring a null model without island age constraints, and repeated dispersal events to the other islands, including three independent but synchronous colonisations of New Zealand during the Miocene. New Caledonia, with a highly diverse Eumolpinae fauna of uncertain origin, acted as a hub and pump of biodiversity of these beetles in the entire South Pacific region, sending migrants to other islands through long-distance dispersal with lineages establishing when land became available.

Abstract Image

Abstract Image

新喀里多尼亚漫游者与南太平洋叶甲虫超多样化特有品系的历史生物地理学
南太平洋群岛在生物地理学关于沧海桑田和物种扩散在物种分布中的相对重要性的争论中占据中心位置。然而,每个分类群都经历了不同的过程和历史。在此,我们揭示了广泛分布于该地区的多种叶甲虫(Eumolpinae)的历史生物地理学。我们对南太平洋叶甲虫进行了广泛的分类群取样,利用三个单拷贝蛋白编码的核标记和两个线粒体标记推断出了该类群的第一个分子系统发生。在评估了相关支系在替代率方面的世系特异性变化后,利用外群校准和多伽马位点模型(MGSM)估算了最近共同祖先的年龄。生物地理学分析采用了标准的基于事件的推断,同时也考虑了系统发生学的不确定性。西兰岛Eumolpinae是单系动物,似乎是在白垩纪向古近纪过渡时从其全球亲缘动物中分离出来的。分子进化速率的变化影响了群内的干支,其替代率显著下降,而 MGSM 校正恢复了晚始新世-渐新世过渡时期西兰岛乌头蜥科的冠年龄。生物地理推断解决了新喀里多尼亚的辐射起源问题,倾向于无岛屿年龄限制的空模型,以及向其他岛屿的重复扩散事件,包括中新世期间新西兰的三次独立但同步的殖民。新喀里多尼亚的Eumolpinae动物群种类繁多,来源不明,是整个南太平洋地区这些甲虫生物多样性的枢纽和泵,通过长距离扩散向其他岛屿输送迁徙者,并在有陆地时建立世系。
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来源期刊
Systematic Entomology
Systematic Entomology 生物-进化生物学
CiteScore
10.50
自引率
8.30%
发文量
49
审稿时长
>12 weeks
期刊介绍: Systematic Entomology publishes original papers on insect systematics, phylogenetics and integrative taxonomy, with a preference for general interest papers of broad biological, evolutionary or zoogeographical relevance.
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