Diversity and distribution of Oxytropis DC. (Fabaceae) species in Asian Russia

Санданов, Д. В.; Dugarova, Anastasiia S; Brianskaia, Elena; Selyutina, I. Yu.; Makunina, Natalia I; Dudov, Sergey V.; Chepinoga, Victor V.; Wang, Zhiheng

doi:10.3897/bdj.10.e78666

Cited by 8 publications

(2 citation statements)

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“…Among our outgroups, we sampled 71 species of Oxytropis, a monophyletic closely related segregate of Astragalus more prevalent in the Arctic (Meyers, 2012;Sandanov et al, 2022) that has been studied previously using small numbers of chloroplast and nuclear ribosomal markers (Archambault and Strömvik, 2012;Meyers, 2012;Kholina et al, 2016Kholina et al, , 2020Tekpinar et al, 2016a;b), as well as phylogenomic data to a limited extent (Shahi Shavvon et al, 2017). Biogeography of the Oxytropis species of the Americas was investigated by Archambault and Strömvik (2012) and Tekpinar et al (2016b); both studies suggested multiple dispersals to the Americas from Eurasia, but were limited by very little nucleotide variation and were unable to target specifically the origin of this dispersal.…”

Section: Astragalus Oxytropis and Astragalean Clade Relationships-mos...mentioning

confidence: 99%

Anatomy of a mega-radiation: Biogeography and niche evolution inAstragalus

Folk

Charboneau

Belitz

et al. 2023

Preprint

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Astragalus (Fabaceae), with more than 3,000 species, represents a successful radiation of morphologically highly similar species found across the Northern Hemisphere. It has attracted attention from systematists and biogeographers, who have asked what factors might be behind the extraordinary diversity of this important arid-adapted clade and what sets it apart from close relatives with far less species richness. Here, for the first time using extensive taxonomic sampling in a phylogenetic analysis, we ask whether (1) Astragalus is uniquely characterized by bursts of radiation or is instead similar to related taxa. Then we test whether the species diversity of Astragalus is attributable specifically to its predilection for (2) cold and arid habitats or (3) particular soils. Finally, we test (4) whether Astragalus originated in central Asia as proposed and (5) whether niche evolutionary shifts were associated with the colonization of other continents. Our results point to the importance of heterogeneity in the diversification of Astragalus, with upshifts associated with the earliest divergences but attributable to no abiotic factor or biogeographic regionalization tested here. The only potential correlate with diversification we identified was chromosome number. We find strong evidence for a central Asian origin and direct dispersals from this region responsible for much of the present-day distribution, highlighting the importance of central Asia as a biogeographic gateway. In contrast to diversification shifts, biogeographic shifts have a strong association with the abiotic environment. Our most important result was a fundamental divide in soil types and diurnal temperature variation between the Eastern and Western Hemisphere species; this divergence does not reflect differences in available habitat among these biogeographic domains but may reflect unique local gains of edaphic and abiotic stress adaptations. While large clades are logistically difficult to tackle, our investigation shows the importance of phylogenetic and evolutionary studies of "mega-radiations." Our findings reject any simple key innovation behind the dominance and richness of Astragalus and underline the often nuanced, multifactorial processes leading to species-rich clades.

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Section: Astragalus Oxytropis and Astragalean Clade Relationships-mos...mentioning

confidence: 99%

Anatomy of a mega-radiation: Biogeography and niche evolution inAstragalus

Folk

Charboneau

Belitz

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Among our outgroups, we sampled 71 species of Oxytropis, a monophyletic segregate of Astragalus more prevalent in the Arctic (Meyers, 2012;Sandanov et al, 2022) that has been studied previously using small numbers of chloroplast and nuclear ribosomal markers (Archambault and Strömvik, 2012;Meyers, 2012;Kholina et al, 2016Kholina et al, , 2020Tekpinar et al, 2016a, b) and to a limited extent, phylogenomic data (Shahi Shavvon et al, 2017). Biogeography of the Oxytropis species of the Americas was investigated by Archambault and Strömvik (2012) and Tekpinar et al (2016b).…”

Section: Astragalus Oxytropis and Astragalean Clade Relationshipsmentioning

confidence: 99%

Anatomy of a mega‐radiation: Biogeography and niche evolution in Astragalus

Folk,

Charboneau,

Belitz

et al. 2024

American J of Botany

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PremiseAstragalus (Fabaceae), with more than 3000 species, represents a globally successful radiation of morphologically highly similar species predominant across the northern hemisphere. It has attracted attention from systematists and biogeographers, who have asked what factors might be behind the extraordinary diversity of this important arid‐adapted clade and what sets it apart from close relatives with far less species richness.MethodsHere, for the first time using extensive phylogenetic sampling, we asked whether (1) Astragalus is uniquely characterized by bursts of radiation or whether diversification instead is uniform and no different from closely related taxa. Then we tested whether the species diversity of Astragalus is attributable specifically to its predilection for (2) cold and arid habitats, (3) particular soils, or to (4) chromosome evolution. Finally, we tested (5) whether Astragalus originated in central Asia as proposed and (6) whether niche evolutionary shifts were subsequently associated with the colonization of other continents.ResultsOur results point to the importance of heterogeneity in the diversification of Astragalus, with upshifts associated with the earliest divergences but not strongly tied to any abiotic factor or biogeographic regionalization tested here. The only potential correlate with diversification we identified was chromosome number. Biogeographic shifts have a strong association with the abiotic environment and highlight the importance of central Asia as a biogeographic gateway.ConclusionsOur investigation shows the importance of phylogenetic and evolutionary studies of logistically challenging “mega‐radiations.” Our findings reject any simple key innovation behind high diversity and underline the often nuanced, multifactorial processes leading to species‐rich clades.

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