Is the sword moss (Bryoxiphium) a preglacial Tertiary relict?

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Serval ID
serval:BIB_AB0DB2A2A9BD
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Is the sword moss (Bryoxiphium) a preglacial Tertiary relict?
Journal
Molecular Phylogenetics and Evolution
Author(s)
Patiño J., Goffinet B., Sim-Sim M., Vanderpoorten A.
ISSN
1095-9513 (Electronic)
ISSN-L
1055-7903
Publication state
Published
Issued date
2016
Volume
96
Pages
200-206
Language
english
Abstract
The disjunction of floras between East Asia, Southeast North America, West North America, and Southwest Eurasia has been interpreted in terms of the fragmentation of a once continuous mixed mesophytic forest that occurred throughout the Northern Hemisphere due to the climatic and geological changes during the late Tertiary. The sword moss, Bryoxiphium, exhibits a distribution that strikingly resembles that of the mesophytic forest elements such as Liriodendron and is considered as the only living member of an early Tertiary flora in Iceland. These hypotheses are tested here using molecular dating analyses and ancestral area estimations. The results suggest that the extant range of Bryoxiphium results from the fragmentation of a formerly wider range encompassing North America and Southeast Asia about 10 million years ago. The split of continental ancestral populations is too recent to match with a continental drift scenario but is spatially and temporally remarkably congruent with that observed in Tertiary angiosperm relict species. The timing of the colonization of Iceland from Macaronesian ancestors, about two million years ago, is, however, incompatible with the hypothesis that Bryoxiphium is the only living member of an early Tertiary flora of the island. Alaska was recurrently colonized from East Asia. The ability of Bryoxiphium to overcome large oceanic barriers is further evidenced by its occurrence on remote oceanic archipelagos. In particular, Madeira was colonized twice independently from American and East Asian ancestors, respectively. The striking range disjunction of Bryoxiphium is interpreted in terms of its mating system, as the taxon exhibits a very singular pattern of spatial segregation of the sexes.
Keywords
Ancestral area estimation, East Asia, Extinction, Iceland, Long-distance dispersal, North America
Pubmed
Web of science
Create date
24/03/2016 15:07
Last modification date
20/08/2019 15:15
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