Species tree phylogeny, character evolution, and biogeography of the Patagonian genus Anarthrophyllum Benth. (Fabaceae)
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ORIGINAL ARTICLE
Species tree phylogeny, character evolution, and biogeography of the Patagonian genus Anarthrophyllum Benth. (Fabaceae) Fernanda Achimón 1 & Leigh A. Johnson 2 & Andrea A. Cocucci 3 & Alicia N. Sérsic 3 & Matias C. Baranzelli 3 Received: 6 June 2017 / Accepted: 28 December 2017 # Gesellschaft für Biologische Systematik 2018
Abstract Geologic events promoting the aridization of southern South America contributed to lineage divergences and species differentiation through geographic (allopatric divergence) and biotic and abiotic factors (ecological divergence). For the genus Anarthrophyllum, which is distributed in arid and semi-arid regions of Patagonia, we assessed how these factors affected species diversification and reconstructed its possible biogeographic history in South American arid environments. Sequences were obtained from two molecular markers: the ITS nuclear region and the trnS-trnG plastid region. Using Parsimony, Maximum likelihood and Bayesian inference individual gene trees were reconstructed, and a species tree was obtained using multi-species coalescent analysis. Divergence times among species were estimated using secondary calibrations. Flexible Bayesian models and stochastic character mapping were used to elucidate ancestral geographic distributions and the evolution of the floral and vegetative phenotypes in the genus. Gene trees and species tree analyses strongly support Anarthrophyllum as monophyletic; all analyses consistently retrieved three well-supported main clades: High Andean Clade, Patagonian Clade 1, and Patagonian Clade 2. Main diversification events occurred concomitant with the Andean uplift and steppe aridization; the Andean mountain range possibly acted as a species barrier for the High Andean Clade. Vegetative traits showed adaptations to harsh climates in some clades, while pollinator-related floral features were associated with independent diversification in bee- and bird-pollinated clades within both Patagonian Clades. In conclusion, evolutionary and biogeographic history of Anarthrophyllum resulted from the action of ecological, historical, and geographic factors that acted either alternatively or simultaneously. Keywords Arid lands . Andes . Payunia . Molecular dating . Patagonian steppe . Ancestral state reconstruction
Introduction In evolutionary diversification, concur processes take place at geographic scale, such as the emergence of geographic
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s13127-017-0355-1) contains supplementary material, which is available to authorized users. * Matias C. Baranzelli [email protected] 1
Laboratorio de Fitoquímica - FCEFyN - Instituto Multidisciplinario de Biología Vegetal (IMBIV), CONICET-Universidad Nacional de Córdoba, Córdoba, Argentina
2
Department of Biology and M. L. Bean Life Science Museum, Brigham Young University, Provo, UT, USA
3
Laboratorio de Ecología Evolutiva - Biología Floral, Instituto Multidisciplinario de Biología Vegetal (IMBIV), C
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