Pleistocene diversification of unifoliolate-leaved Lupinus (Leguminosae: Papilionoideae) in Florida
Pleistocene diversification of unifoliolate-leaved Lupinus (Leguminosae: Papilionoideae) in Florida
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DOI：
10.1111/mec.17232
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发表时间：
2024-01-11
影响因子：
4.9
通讯作者：
Hughes，Colin E.
中科院分区：
文献类型：
--
作者：
Nevado，Bruno;Atchison，Guy W.;Hughes，Colin E.
在更新世期间，在许多生物群和地文环境中，最近的冰期和冰后期物种形成和物种多样化的重要性和普遍性已经得到了很好的确立。然而，更新世的多样性在多大程度上可以归因于气候振荡及其对分布范围和种群结构的影响仍然存在争议。在这项研究中，我们使用形态，地理和遗传（RADseq）数据记录更新世物种形成和种内多样化的单小叶分支的FloridaLupinus，一小群物种主要限于内陆和沿海沙脊横跨佛罗里达半岛和狭长地带。系统发育和人口学分析以及形态学和地理学证据表明，该分支内最近的物种形成和种内分化是由土壤生态位保守性引起的非适应性异地分化和冰后期新沙脊栖息地出现所带来的机会的组合所驱动的。这些结果突出了核心的重要性，即使是温和的地理隔离和短期的异地分歧范围扩大后出现的新类群，并增加了越来越多的证据表明，更新世气候振荡可能有助于快速多样化的无数的地文设置。此外，我们的研究结果揭示了新的长期存在的分类学争论周围的物种数量在佛罗里达unifoliateLupinusclade提供支持识别的五个物种和一组种内变异。本文讨论了与其姊妹种Lupinus westianus在遗传学上不同的高度濒危物种Lupinus aridorum的重要保护意义。
The importance and prevalence of recent ice‐age and post‐glacial speciation and species diversification during the Pleistocene across many organismal groups and physiographic settings are well established. However, the extent to which Pleistocene diversification can be attributed to climatic oscillations and their effects on distribution ranges and population structure remains debatable. In this study, we use morphologic, geographic and genetic (RADseq) data to document Pleistocene speciation and intra‐specific diversification of the unifoliolate‐leaved clade of FloridaLupinus, a small group of species largely restricted to inland and coastal sand ridges across the Florida peninsula and panhandle. Phylogenetic and demographic analyses alongside morphological and geographic evidence suggest that recent speciation and intra‐specific divergence within this clade were driven by a combination of non‐adaptive allopatric divergence caused by edaphic niche conservatism and opportunities presented by the emergence of new post‐glacial sand ridge habitats. These results highlight the central importance of even modest geographic isolation and short periods of allopatric divergence following range expansion in the emergence of new taxa and add to the growing evidence that Pleistocene climatic oscillations may contribute to rapid diversification in a myriad of physiographic settings. Furthermore, our results shed new light on long‐standing taxonomic debate surrounding the number of species in the Florida unifoliateLupinusclade providing support for recognition of five species and a set of intra‐specific variants. The important conservation implications for the narrowly restricted, highly endangered speciesLupinus aridorum, which we show to be genetically distinct from its sister speciesLupinus westianus, are discussed.