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The phylogeographic history of Megistostegium (Malvaceae) in the dry, spiny thickets of southwestern Madagascar using RAD‐seq data and ecological niche modeling.
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- Author(s): Hanes, Margaret M.1 (AUTHOR) ; Shell, Susan1 (AUTHOR); Shimu, Tahsina1 (AUTHOR); Crist, Clarissa1 (AUTHOR); Machkour‐M'Rabet, Salima2 (AUTHOR)
- Source:
Ecology & Evolution (20457758). Feb2022, Vol. 12 Issue 2, p1-16. 16p.- Subject Terms:
- Source:
- Additional Information
- Subject Terms:
- Abstract: The spiny thicket of southwestern Madagascar represents an extreme and ancient landscape with extraordinary levels of biodiversity and endemism. Few hypotheses exist for explaining speciation in the region and few plant studies have explored hypotheses for species diversification. Here, we investigate three species in the endemic genus Megistostegium (Malvaceae) to evaluate phylogeographic structure and explore the roles of climate, soil, and paleoclimate oscillations on population divergence and speciation throughout the region. We combine phylogenetic and phylogeographic inference of RADseq data with ecological niche modeling across space and time. Population structure is concurrent with major rivers in the region and we identify a new, potentially important biogeographic break coincident with several landscape features. Our data further suggests that niches occupied by species and populations differ substantially across their distribution. Paleodistribution modeling provide evidence that past climatic change could be responsible for the current distribution, population structure, and maintenance of species in Megistostegium. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Ecology & Evolution (20457758) is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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