Apr 25, 2020

Geographic and subsequent biotic isolations led to a diversity anomaly of Heterotropa (Aristolochiaceae) in insular versus continental regions of the Sino-Japanese Floristic Region

BioRxiv : the Preprint Server for Biology
Daiki TakahashiH. Setoguchi

Abstract

The Sino-Japanese Floristic Region is highly diverse with respect to temperate plants. However, the reasons for this diversity are poorly understood because most studies have only considered geographic isolation caused by climatic oscillations. Heterotropa (genus Asarum; Aristolochiaceae) diverges here and shows high species diversity in insular systems (63 species) compared to continental areas (25 species). Heterotropa shows low dispersal ability with small distribution ranges, implying diversification by geographic events, and high floral diversity, implying pollinator-mediated diversification. To reveal how abiotic and biotic factors have shaped the diversity anomaly of Heterotropa, we conducted phylogenetic analysis using ddRAD-seq and chloroplast genome datasets including 79 species, estimation of floral trait evolution, and comparison of isolation factors within clades based on distribution range and floral trait analysis. Phylogenetic analysis indicates that Heterotropa originated in mainland China and expanded to the Japanese Archipelago in the Miocene, and the major clades almost correspond to geographic distributions. Floral traits evolved repeatedly in the tip nodes within the clades. Although the major clades inclu...Continue Reading

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Mentioned in this Paper

Biological Markers
Structure of Beard
Genes
Emotional Responses
Simulation
Laboratory Culture
Population Group
EAF2 gene

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