Allopatric hybrids as evidence for past range dynamics in Sempervivum (Crassulaceae), a western Eurasian high mountain oreophyte

Klein, Johannes; Kadereit, Joachim W.

doi:10.1007/s00035-016-0164-8

Cited by 20 publications

(21 citation statements)

References 63 publications

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“…While the impacts of both niche evolution and climate change on hybridization are poorly understood, more study has been devoted to the latter question, with many qualitative hypotheses that hybridization in various plant groups was enabled by increased geographic range contact under Pleistocene glacial conditions. One extreme situation where this situation arises is in putative ancestral hybridization events where the descendants are allopatric and highly disjunct, a phenomenon observed in several plant lineages (Klein and Kadereit, ; Marques et al., ; Folk et al., ).…”

Section: Ancient Hybridization and Historical Climate Change: Questiomentioning

confidence: 99%

“…These results, primarily based on ecological modeling and paleoclimate data, are consistent with the fossil record, which has long suggested the existence of forested dispersal corridors in what are currently desert regions (e.g., Gugger et al., ). These diverse range dynamics could add to the instability of geographic relationships among taxa, potentially creating some of the unusual distributions observed in ancestral hybridization events (Klein and Kadereit, ; Marques et al., ; Folk et al., ). Of course, these observations are not limited to Pleistocene scenarios; the accumulation of more ancient hybridization events will create opportunities for testing the association of hybridization with other periods of elevated disturbance.…”

Section: Ancient Hybridization and Historical Climate Change: Questiomentioning

confidence: 99%

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New prospects in the detection and comparative analysis of hybridization in the tree of life

Folk

Soltis

et al. 2018

American J of Botany

133

108

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Assessing the relative importance of the various pathways to diversification is a central goal of biodiversity researchers. For plant biologists, and increasingly across the spectrum of biological sciences, among these pathways of interest is hybridization. New methodological developments are moving the field away from questions of whether natural hybridization occurs or hybrids can persist and toward more direct assessments of the long-term impact of hybridization on diversification and genome organization. Advances in theory and new data, especially phylogenomic data, have changed the face of this field, revealing extensive occurrences of hybridization at both shallow and deep levels, but lacking is a synthesis of these advancements. Here we provide an overview of methods that have been proposed for detecting hybridization with molecular data and advocate a time-extended, comparative view of reticulate evolution. In particular, we pose three overarching questions, newly placed within reach, that are critical for advancing our understanding of hybridization pattern and process: (1) How often is introgression biased toward certain genomes and loci, and is this bias selectively neutral? (2) What are the relative rates of formation of hybrid species and introgressants, and how does this compare to their subsequent fates? (3) Has the frequency of hybridization increased under historical periods of greater dynamism in climate and geographic range, such as the Pleistocene?

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Section: Ancient Hybridization and Historical Climate Change: Questiomentioning

confidence: 99%

Section: Ancient Hybridization and Historical Climate Change: Questiomentioning

confidence: 99%

New prospects in the detection and comparative analysis of hybridization in the tree of life

Folk

Soltis

et al. 2018

American J of Botany

133

108

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“…), it seems likely that the diversification of Leucanthemum was influenced by climatic changes during the Quaternary over the past 1.6 Myr in Europe. It is well known that alternating glacial and interglacial periods during the Quaternary resulted in changes in distribution ranges of plant populations, leading to homoploid and polyploid hybrid species formation (Klein & Kadereit, ; Marques et al ., ; Folk et al ., ). An appropriate scenario in this context was recently described by Kadereit (), based on a plethora of examples from different plant genera of the northern temperate regions, comprising: climate‐induced range shifts of species during the Quaternary; secondary contact of formerly allopatrically distributed species in refugial or recolonized areas, resulting in formation of interspecific hybrids; recolonization of the originally allopatric ranges by parental species; and hybrids remaining in the area of secondary contact along with geographical isolation from their parents.…”

Section: Discussionmentioning

confidence: 99%

‘At the crossroads towards polyploidy’: genomic divergence and extent of homoploid hybridization are drivers for the formation of the ox‐eye daisy polyploid complex (Leucanthemum, Compositae‐Anthemideae)

et al. 2019

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Polyploidy plays a paramount role in phytodiversity, but the causes of this evolutionary pathway require further study. Here, we use phylogenetic methods to examine possible polyploidy-promoting factors by comparing diploid representatives of the comprehensive European polyploid complex Leucanthemum with members of its strictly diploid North African counterpart Rhodanthemum.We investigate genetic divergence and gene flow among all diploid lineages of both genera to evaluate the role of genomic differentiation and hybridization for polyploid speciation. To test whether hybridization in Leucanthemum has been triggered by the geological conditions during its diversification, we additionally generate a time-calibrated phylogeny of 46 species of the subtribe Leucantheminae.Leucanthemum shows a significantly higher genetic divergence and hybridization signal among diploid lineages compared with Rhodanthemum, in spite of a similar crown age and diversification pattern during the Quaternary.Our study demonstrates the importance of genetic differentiation among diploid progenitors and their concurrent affinity for natural hybridization for the formation of a polyploid complex. Furthermore, the role of climate-induced range overlaps on hybridization and polyploid speciation during the Quaternary is discussed. Research Plastid and nuclear marker sequencingWe sequenced a set of eight nuclear markers (A39, B12 B20, C12, C20, D18, D23, D27) which were characterized as putative single-copy regions for the sunflower family (Compositae) by Chapman et al. (2007). Additionally, we sequenced the nuclear

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“…The extant occurrences of the species in the Massif Central and Rhine Gorge area would then be the remnants of a formerly continuous and larger distribution area. Based on the non-sympatric distribution of hybrid and parent individuals in Sempervivum, long-distance migration of the genus in glacial times has indeed been postulated by Klein & Kadereit (2016). The existence and persistence through at least the last glacial of such "northern" lineages including populations from the Massif Central (but also other populations from elsewhere in Europe) has been postulated before for other mountain species such as Pulsatilla alpina (L.) Delarbre (Zetzsche 2004), Meum athamanticum Jacq.…”

Section: Identity and Relationships Of Rhine Gorge Sempervivum Tectorummentioning

confidence: 99%

“…In the context of a phylogenetic study of Sempervivum L. and Jovibarba Opiz (Klein & Kadereit 2015), an analysis of the geographical distribution of interspecific hybrids and their parental species (Klein & Kadereit 2016), and ongoing studies on the evolution of S. tecto-…”

Section: Introductionmentioning

confidence: 99%

Identity and relationships of Sempervivum tectorum (Crassulaceae) in the Rhine Gorge area

Fabritzek

Kadereit

2018

Willdenowia

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Sempervivum tectorum (Crassulaceae), an orophyte widespread in the European high mountains, also grows in rocky habitats of the Rhine Gorge area (Upper Middle Rhine, Mosel and Ahr river valleys). On the background of its long history of cultivation, it is unclear whether S. tectorum is native or naturalized in the Rhine Gorge area. Using 52 accessions of S. tectorum from across its geographical range (except SE Europe) as well as 15 samples of S. calcareum and S. marmoreum in our final sample, we conducted a genotyping-by-sequencing analysis. The genetic data were used for the identification of genetic groups and for the reconstruction of phylogenetic relationships. We found that the material from the Rhine Gorge area forms a homogeneous genetic group that is clearly distinct from populations from the Massif Central, Alps and Pyrenees. The Rhine Gorge material appears to be most closely related to material from the Massif Central. We hypothesize that the disjunct distribution of the Rhine Gorge/Massif Central clade is best interpreted as the remnant of a formerly wider distribution area obtained in a Quaternary glacial. The possibility of recognizing Rhine Gorge material taxonomically is discussed and rejected for morphological and nomenclatural reasons.

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Allopatric hybrids as evidence for past range dynamics in Sempervivum (Crassulaceae), a western Eurasian high mountain oreophyte

Cited by 20 publications

References 63 publications

New prospects in the detection and comparative analysis of hybridization in the tree of life

New prospects in the detection and comparative analysis of hybridization in the tree of life

‘At the crossroads towards polyploidy’: genomic divergence and extent of homoploid hybridization are drivers for the formation of the ox‐eye daisy polyploid complex (Leucanthemum, Compositae‐Anthemideae)

Identity and relationships of Sempervivum tectorum (Crassulaceae) in the Rhine Gorge area

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