Hybridization and long-distance colonization at different time scales: towards resolution of long-term controversies in the sweet vernal grasses (Anthoxanthum)

Pimentel, Manuel; Sahuquillo, Elvira; Torrecilla, Zeltia; Popp, Magnus; Catalán, Pilar; Brochmann, Christian

doi:10.1093/aob/mct170

Cited by 27 publications

(60 citation statements)

References 79 publications

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“…In contrast, colonizations of Madagascar from mainland Asia have been frequent for several plant and animal lineages at different Cenozoic times (e.g. the temperate grass Anthoxanthum in the Pliocene; Pimentel et al, 2013), because of the presence of prevalent summer winds connecting the Indian subcontinent with Madagascar (Warren et al, 2010). In Loliinae, additional colonizations of S. Africa seem to have occurred through LDDs from C. America in the Mid-Miocene, resulting in the isolated BL F. scabra lineage, and from the Eurasian region in the Late Miocene, resulting in the FL Exaratae F. vulpioides and F. Figure 5 Mean per-route dispersal rates in Loliinae inferred with biogeographical stochastic mapping plotted against the shortest distance between respective OAs.…”

Section: Dec and Dec+j+x: Dispersal Countsmentioning

confidence: 99%

Contrasting dispersal histories of broad‐ and fine‐leaved temperate Loliinae grasses: range expansion, founder events, and the roles of distance and barriers

Minaya

Hackel

Namaganda

et al. 2017

Journal of Biogeography

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Aim Successful colonization after long‐distance dispersal (LDD) depends on the availability of suitable habitats and competitive ability. In this study, we address the hypothesis that two widely distributed sister grass lineages (broad‐ and fine‐leaved Loliinae; hereafter BL and FL) that differ in their habitat requirements and competitive ability also differ in their biogeographic history, with particular reference to LDD. Location Global. Methods We reconstructed a comprehensive phylogeny of Loliinae, based on nuclear and plastid markers and estimated divergence times using fossil calibrations. Biogeographical events were estimated using analysis of range evolution, comparing different models. Numbers and rates of dispersals were estimated for BL and FL using stochastic mapping with best‐performing and baseline biogeographical models, and examined for correlation with distance, disjunction type, and phenotypic syndrome. Results The most recent common ancestor of Loliinae likely split at the Oligocene‐Miocene transition (22.50 ± 3.95 Ma), pre‐dating previous estimates, whereas the ancestors of the BL and FL Loliinae likely began to diversify in the Early Miocene (18.91 ± 4.15 and 17.50 ± 3.50 Ma, respectively). A model of range evolution integrating founder events and scaling of dispersal by shortest distance between areas performed best amongst a set of alternative models and recovered a mean of 83 dispersal events in Loliinae. Overall dispersal rates were significantly higher in BL than in FL. Per‐route dispersal rates showed a significant negative exponential relationship to shortest distance but were not affected by phenotypic syndrome or disjunction type. Main conclusions Loliinae originated in the Northern Hemisphere and evolved through recurrent LDDs. Higher competitive ability, potentially related to the broad‐leaved syndrome (i.e. tall strong‐rhizomatous plants, long‐living individuals, occupancy of more stable habitats), may explain higher observed dispersal rates in BL compared with FL Loliinae. However, the dominant factor impacting dispersal in both BL and FL Loliinae is the distance between suitable areas.

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Section: Dec and Dec+j+x: Dispersal Countsmentioning

confidence: 99%

Contrasting dispersal histories of broad‐ and fine‐leaved temperate Loliinae grasses: range expansion, founder events, and the roles of distance and barriers

Minaya

Hackel

Namaganda

et al. 2017

Journal of Biogeography

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“…Br.) (Pimentel et al 2013), Phalaridinae the genus Phalaris L., Brizinae the genera Airopsis Desv. and Briza L., and Torreyochloinae the genera Amphibromus Nees and Torreyochloa Nees.…”

Section: Introductionmentioning

confidence: 99%

“…In many cases ETS evolves faster than the ITS regions and is informative for phylogenetic reconstruction, especially when combined with ITS (Poczai and Hyvönen 2010). In Poaceae, the ETS region has been sampled in diverse grass genera (Duvall et al 2003, Sallares and Brown 2004, Gillespie et al 2009, Consaul et al 2010, Catalán et al 2012, Refulio-Rodriguez et al 2012, Pimentel et al 2013, Alonso et al 2014, Birch et al 2014, Scataglini et al 2014, Soreng et al 2015a), but of the subtribes of Poeae chloroplast group 1 its phylogenetic utility has only been characterized in Anthoxanthinae (Pimentel et al 2013). Additionally, we present a densely sampled ITS phylogeny, including new and previously published ITS sequences of subtribe Poeae.…”

Section: Introductionmentioning

confidence: 99%

Molecular phylogenetics of cool-season grasses in the subtribes Agrostidinae, Anthoxanthinae, Aveninae, Brizinae, Calothecinae, Koeleriinae and Phalaridinae (Poaceae, Pooideae, Poeae, Poeae chloroplast group 1)

Saarela¹,

Bull²,

Paradis³

et al. 2017

138

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Circumscriptions of and relationships among many genera and suprageneric taxa of the diverse grass tribe Poeae remain controversial. In an attempt to clarify these, we conducted phylogenetic analyses of >2400 new DNA sequences from two nuclear ribosomal regions (ITS, including internal transcribed spacers 1 and 2 and the 5.8S gene, and the 3’-end of the external transcribed spacer (ETS)) and five plastid regions (matK, trnL–trnF, atpF–atpH, psbK–psbI, psbA–rps19–trnH), and of more than 1000 new and previously published ITS sequences, focused particularly on Poeae chloroplast group 1 and including broad and increased species sampling compared to previous studies. Deep branches in the combined plastid and combined ITS+ETS trees are generally well resolved, the trees are congruent in most aspects, branch support across the trees is stronger than in trees based on only ITS and fewer plastid regions, and there is evidence of conflict between data partitions in some taxa. In plastid trees, a strongly supported clade corresponds to Poeae chloroplast group 1 and includes Agrostidinae p.p., Anthoxanthinae, Aveninae s.str., Brizinae, Koeleriinae (sometimes included in Aveninae s.l.), Phalaridinae and Torreyochloinae. In the ITS+ETS tree, a supported clade includes these same tribes as well as Sesleriinae and Scolochloinae. Aveninae s.str. and Sesleriinae are sister taxa and form a clade with Koeleriinae in the ITS+ETS tree whereas Aveninae s.str. and Koeleriinae form a clade and Sesleriinae is part of Poeae chloroplast group 2 in the plastid tree. All species of Trisetum are part of Koeleriinae, but the genus is polyphyletic. Koeleriinae is divided into two major subclades: one comprises Avellinia, Gaudinia, Koeleria, Rostraria, Trisetaria and Trisetum subg. Trisetum, and the other Calamagrostis/Deyeuxia p.p. (multiple species from Mexico to South America), Peyritschia, Leptophyllochloa, Sphenopholis, Trisetopsis and Trisetum subg. Deschampsioidea. Graphephorum, Trisetum cernuum, T. irazuense and T. macbridei fall in different clades of Koeleriinae in plastid vs. nuclear ribosomal trees, and are likely of hybrid origin. ITS and matK trees identify a third lineage of Koeleriinae corresponding to Trisetum subsect. Sibirica, and affinities of Lagurus ovatus with respect to Aveninae s.str. and Koeleriinae are incongruent in nuclear ribosomal and plastid trees, supporting recognition of Lagurus in its own subtribe. A large clade comprises taxa of Agrostidinae, Brizinae and Calothecinae, but neither Agrostidinae nor Calothecinae are monophyletic as currently circumscribed and affinities of Brizinae differ in plastid and nuclear ribosomal trees. Within this clade, one newly identified lineage comprises Calamagrostis coarctata, Dichelachne, Echinopogon (Agrostidinae p.p.) and Relchela (Calothecinae p.p.), and another comprises Chascolytrum (Calothecinae p.p.) and Deyeuxia effusa (Agrostidinae p.p.). Within Agrostidinae p.p., the type species of Deyeuxia and Calamagrostis s.str. are closely related, supporting classification of Dey...

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“…Within the unresolved doria-decurrens clade, two diff erent colonization scenarios are conceivable. One possible scenario is that a Palearctic lineage gave rise to tropical afroalpine species in the doria subclade, a pattern that has been found before for otherwise predominantly northern temperate groups Gehrke et al, 2008 ;Gehrke and Linder, 2009 ;Pimentel et al, 2013 ). Th e other is that there was one colonization from ESA to the Palearctic via EA by a mrca of the doria clade as hypothesized but never unambiguously demonstrated for other disjunct northern temperate/Mediterranean-SA genera ( Galley et al, 2007 ;Devos et al, 2010 ;Galbany-Casals et al, 2014 ;Kandziora et al, 2016 ).…”

Section: Discussionmentioning

confidence: 92%

Frequent colonization and little in situ speciation in Senecio in the tropical alpine‐like islands of eastern Africa

Kandziora

Kadereit

Gehrke

2016

American J of Botany

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PREMISE OF THE STUDY:Floras of continental habitat islands, like those of islands, originate mostly through colonization, which can be followed by in situ speciation. We here address the question of the relative importance of colonization and in situ diversification in the high‐altitude areas of the eastern African high mountains, the tropical Afroalpine Region, using the most species‐rich genus in the region, Senecio, as an example.METHODS:We expanded earlier Senecioneae phylogenies by adding more tropical African species and analyzed our phylogenetic tree biogeographically.KEY RESULTS:Senecio contains at least five clades with tropical African species, all of them containing tropical afroalpine species. Between four to 14 independent colonization events into the tropical Afroalpine most likely from montane regions in southern Africa were found. Additionally, relationships of tropical afroalpine species to Palearctic and South American taxa were identified. Although some in situ diversification occurred in Senecio in the tropical Afroalpine, the resulting number of species per clade is never higher than seven.CONCLUSION:Like other genera, Senecio colonized the tropical Afroalpine several times independently. Comparison with Mt. Kinabalu, a small tropical alpine‐like region in Southeast Asia, and alpine‐like regions in the Andes implies that rates of in situ speciation might be linked to area size.

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Hybridization and long-distance colonization at different time scales: towards resolution of long-term controversies in the sweet vernal grasses (Anthoxanthum)

Cited by 27 publications

References 79 publications

Contrasting dispersal histories of broad‐ and fine‐leaved temperate Loliinae grasses: range expansion, founder events, and the roles of distance and barriers

Contrasting dispersal histories of broad‐ and fine‐leaved temperate Loliinae grasses: range expansion, founder events, and the roles of distance and barriers

Molecular phylogenetics of cool-season grasses in the subtribes Agrostidinae, Anthoxanthinae, Aveninae, Brizinae, Calothecinae, Koeleriinae and Phalaridinae (Poaceae, Pooideae, Poeae, Poeae chloroplast group 1)

Frequent colonization and little in situ speciation in Senecio in the tropical alpine‐like islands of eastern Africa

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