Geographic origins and patterns of radiation of <i>Mertensia</i> (Boraginaceae)

Nazaire, Mare; Wang, Xiaoquan; Hufford, Larry

doi:10.3732/ajb.1300320

Cited by 15 publications

(7 citation statements)

References 104 publications

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“…Long-distance dispersals from Eastern Asia to North America were estimated for Mertensia, in agreement with the study of Nazaire et al (2014). Further dispersals from North America to South America (MRCA of Amsinckiinae and Mertensia) as well as from Eastern Asia to Australia (Austrocynoglossum), and from North America to New Zealand (Myosotidium) also occurred between the Miocene and the Pliocene (Figures 1, 2).…”

Section: Discussionsupporting

confidence: 87%

Biogeographic Events Are Not Correlated with Diaspore Dispersal Modes in Boraginaceae

2017

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Long-distance dispersal seems to be the main biogeographic event responsible for intriguing distribution patterns in plant groups in which sister taxa are separated by thousands of kilometers of distance across oceans and continents. The biotic and abiotic mechanisms behind such dispersal events are poorly understood and many attempts have been made to explain how plants can manage to disperse and survive these long journeys. The biogeographic history of Boraginaceae, a subcosmopolitan plant family with many disjunct clades, is here addressed and analyzed in the context of the different dispersal modes exhibited by the species. The lack of a clear pattern between the main dispersal events in Boraginaceae and the phylogenetic distribution of the dispersal modes indicates that no single dispersal mechanism can be associated with the events of dispersal in the family. Moreover, adaptations to different dispersal agents and unassisted dispersal modes in some clades might have promoted the diversification of Boraginaceae in various habitats across several continents. Our study reveals that long-distance dispersal is a very complex process that needs to be analyzed in the context of climatic and environmental changes and the response of plants and their dispersal vectors to these variable conditions.

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Section: Discussionsupporting

confidence: 87%

Biogeographic Events Are Not Correlated with Diaspore Dispersal Modes in Boraginaceae

2017

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“…Using a more extensive sampling, Nazaire et al . () also retrieved younger ages for stem Boraginales [89 (95% HPD 73–102) Ma]. However, Nazaire et al .…”

Section: Discussionmentioning

confidence: 99%

“…However, Nazaire et al . () used only two, very recent calibration points of Boraginaceae s.str. (2.6 and 5.3 Ma).…”

Section: Discussionmentioning

confidence: 99%

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Historical biogeography of Boraginales: West Gondwanan vicariance followed by long‐distance dispersal?

Luebert

Couvreur

Gottschling

et al. 2016

Journal of Biogeography

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Aim To examine the historical biogeography of the Boraginales using molecular dating and ancestral area reconstruction. Location World‐wide. Methods We constructed data sets that included all major clades of Boraginales and all orders of asterids using previously published sequences of four plastid markers (trnL‐trnF, rps16, ndhF, rbcL). We estimated divergence times using a Bayesian uncorrelated, lognormal relaxed clock approach with four different fossil calibration schemes. Ancestral areas were reconstructed using maximum likelihood methods (Dispersal‐Extinction‐Cladogenesis). Results Boraginales originated during the Early to Late Cretaceous and started its diversification in the Late Cretaceous. The inferred ancestral area of Boraginales includes the Americas and Africa. The two major clades of Boraginales diversified during the Early Paleogene from African and American ancestors respectively. Early branching families in both clades (Codonaceae and Wellstediaceae in one clade and Hydrophyllacee and Namaceae in the other) may have remained restricted to their areas of origin. The other families started diversifying in several regions of the world during the Eocene (Boraginaceae s.str., Heliotropiaceae, Ehretiaceae) or later (Cordiaceae). Main conclusions Molecular dating and ancestral area reconstruction may be broadly consistent with the idea of a vicariant origin of the two major clades of Boraginales after the break‐up of West Gondwana, followed by several independent trans‐oceanic dispersal events into most areas of the world. However, uncertainty in both divergence times and ancestral area reconstruction do not rule out the possibility of an origin involving long‐distance dispersal.

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“…Chloroplast and nuclear estimates for the divergence between these two species overlap in the Upper Miocene to Upper Pliocene, consistent with allopatric speciation between lineages driven by orogeny of the Cascade and Sierra Nevada Ranges. Ancient vicariance (sensu Brunsfeld et al., ), similarly driven by topographical changes in the region, has been supported in studies of other species, including various amphibians (e.g., tailed frogs, Ascaphus ; Pacific giant salamanders, Dicamptodon ; plethodontid salamanders, Plethodon ; Carstens, Brunsfeld, Demboski, Good, & Sullivan, ), gray jays ( Perisoreus canadensis ; van Els, Cicero, & Klicka, ), Douglas‐fir ( Pseudotsuga menziesii ; Gugger & Sugita, ; Gugger et al., ), Constance's bittercress ( Cardamine constancei ; Brunsfeld & Sullivan, ), bluebells ( Mertensia ; Nazaire, Wang, & Hufford, ) and kittentails ( Synthyris ; Marlowe & Hufford, ). A Miocene–Pliocene orogeny‐driven allopatric divergence between C. biflora and C. chionophila is supported by our data, contrasting with the hypothesis proposed by Smit and Punt () of a more recent Pleistocene climate‐driven divergence.…”

Section: Discussionmentioning

confidence: 91%

Dated phylogeography of western North American subalpine marshmarigolds (Caltha spp., Ranunculaceae): Miocene–Pliocene divergence of hexaploids, multiple origins of allododecaploids during the Pleistocene, and repeated recolonization of Last Glacial Maximum glaciated regions

Wefferling

Hoot

2018

Journal of Biogeography

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Aim In order to understand how a montane polyploid species complex responded to Cenozoic mountain uplift and climate change, we reconstructed the biogeographic history of the subalpine marshmarigold polyploid complex, including Caltha biflora, Caltha chionophila and Caltha leptosepala. Phylogenies at multiple taxonomic levels were used to estimate the timing of species divergence, allopolyploid formation and migration patterns, and to identify Last Glacial Maximum (LGM) refugia and recolonization routes. Location Western North America. Methods A fossil‐calibrated chronogram was estimated for the eudicot order Ranunculales that was in turn used to set age priors on genus‐level Caltha phylogenies. Nuclear ribosomal and chloroplast DNA sequence data were collected from subalpine marshmarigolds, including 161 specimens from across the geographical range of the complex. The datasets were analysed under a strict or relaxed molecular clock and a structured coalescent model of evolution estimated under a Bayesian framework. Results Hexaploids C. biflora and Caltha chionophila diverged in the Upper Miocene to Lower Pleistocene (chloroplast and nuclear dataset estimates overlapping at the Miocene–Pliocene boundary), and upon secondary contact formed allododecaploid C. leptosepala bidirectionally and at least three times. The hexaploids persisted to the south of LGM icesheets and recolonized LGM glaciated regions in multiple waves, mainly from the C. biflora clade in the Cascades and Coast Ranges. Main conclusions This study of a widespread western North American plant lineage shows a complex response to past geological and climatic changes, with multiple refugia, allopolyploidization events, and migrations during the Pleistocene. Bidirectional allododecaploid formation has resulted in cryptic lineages, some of which (C. leptosepala in the Cascades and Coast Ranges) have been more successful at reclaiming glaciated regions than others (C. leptosepala in the Northern Rockies).

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Geographic origins and patterns of radiation of Mertensia (Boraginaceae)

Cited by 15 publications

References 104 publications

Biogeographic Events Are Not Correlated with Diaspore Dispersal Modes in Boraginaceae

Biogeographic Events Are Not Correlated with Diaspore Dispersal Modes in Boraginaceae

Historical biogeography of Boraginales: West Gondwanan vicariance followed by long‐distance dispersal?

Dated phylogeography of western North American subalpine marshmarigolds (Caltha spp., Ranunculaceae): Miocene–Pliocene divergence of hexaploids, multiple origins of allododecaploids during the Pleistocene, and repeated recolonization of Last Glacial Maximum glaciated regions

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