Evolution, range formation and a revised taxonomy of the disjunctly distributed European members of Astragalus sect. Caprini, an intricate group including highly endangered species of dry grasslands
Maylandt, Clemens (University of Innsbruck. Department of Botany)
Kirschner, Philipp (University of Innsbruck. Department of Botany)
Pirkebner, Daniela (University of Innsbruck. Department of Botany)
Frajman, Bozo (University of Innsbruck. Department of Botany)
de Giles, Julio Penas (Universidad de Granada)
Schonswetter, Peter (University of Innsbruck. Department of Botany)
Carnicero, Pau (University of Innsbruck. Department of Botany)

Data:	2025
Descripció:	21 pàg.
Resum:	The Eurasian steppes are among the largest and most threatened biomes on Earth. During cold periods of the Pleistocene, the zonal Eurasian steppes had a much larger extent as compared to interglacial periods, and repeatedly expanded into large areas of present-day forested temperate Europe. Conversely, during warm periods, forest expansion recurrently forced Eurasian steppe biota into disjunct and small warm-stage refugia, i. e. today's extrazonal steppes. The rare, threatened and disjunctly distributed northwestern African and European members of Astragalus sect. Caprini constitute an ideal model for gaining insights into the evolutionary dynamics of typical steppe biota. Here, we reconstructed the spatiotemporal diversification of northwestern African and European members of Astragalus sect. Caprini based on a combination of RADseq data, single gene markers (internal transcribed spacer, plastid ycf1), genome size measurements and multivariate morphometrics. We outline an evolutionary scenario in which the group originated in the Irano-Turanian region and started to diversify shortly after the Mid-Pleistocene-Transition (ca. 0. 5 to 0. 7 Ma). While lineages occurring in (sub-) mediterranean mountain ranges diverged early, lineages occurring in northern lowland steppes are much younger (ca. 0. 2 to 0. 3 Ma), emphasizing the importance of southern European mountain ranges as long-term refugia. Recurrent colonization of the western Mediterranean region by eastern Mediterranean lineages and secondary contacts of currently spatially isolated lineages have significantly (co-)shaped the genetic structure within the group; we assume that these events may be a consequence of cold-stage range expansions. Based on combined genetic and morphometric data, we suggest treating the ten lineages introduced in this study as independent species, contrasting previous taxonomic treatments.
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Eurasian steppe ; Pleistocene ; RADseq ; Secondary contact ; Warm-stage refugium
Publicat a:	Molecular phylogenetics and evolution, Vol. 204 (March 2025) , art. 108242, ISSN 1095-9513

DOI: 10.1016/j.ympev.2024.108242
PMID: 39551224

21 p, 6.3 MB

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