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Northern richness and southern poverty: contrasting genetic footprints of glacial refugia in the relictual tree Sciadopitys verticillata (Coniferales: Sciadopityaceae)
Citation
Worth, JRP and Sakaguchi, S and Tanaka, N and Yamasaki, M and Isagi, Y, Northern richness and southern poverty: contrasting genetic footprints of glacial refugia in the relictual tree Sciadopitys verticillata (Coniferales: Sciadopityaceae), Biological Journal of the Linnean Society, 108, (2) pp. 263-277. ISSN 0024-4066 (2013) [Refereed Article]
Copyright Statement
Copyright 2012 The Linnean Society of London
DOI: doi:10.1111/j.1095-8312.2012.02017.x
Abstract
Sciadopitys verticillata is amongst the most relictual of all plants, being the last living member of an ancient conifer
lineage, the Sciadopityaceae, and is distributed in small and disjunct populations in high rainfall regions of Japan.
Although mega-fossils indicate the persistence of the species within Japan through the Pleistocene glacial–
interglacial cycles, how the species withstood the colder and drier climates of the glacials is not well known. The
present study utilized phylogeography and palaeodistribution modelling to test whether the species survived within
pollen-based coastal temperate forest glacial refugia or within previously unidentified refugia close to its current
range. Sixteen chloroplast haplotypes were found that displayed significant geographical structuring. Unexpectedly,
northern populations in central Honshu most distant from coastal refugia had the highest chloroplast diversity and
were differentiated from the south, a legacy of glacial populations possibly in inland river valleys close to its current
northern range. By contrast, populations near putative coastal refugia in southern Japan, harboured the lower
chloroplast diversity and were dominated by a single haplotype. Fragment size polymorphism at a highly variable
and homoplasious mononucleotide repeat region in the trnT-,i>trnL intergenic spacer reinforced the contrasting
patterns of diversity observed between northern and southern populations. The divergent histories of northern and
southern populations revealed in the present study will inform the management of this globally significant
conifer.
Item Details
| Item Type: | Refereed Article |
|---|---|
| Keywords: | chloroplast DNA, inland refugia, Japanese temperate forest, Japanese umbrella pine, mitochondria, mononucleotide repeats, palaeodistribution modelling, pollen-based refugia |
| Research Division: | Biological Sciences |
| Research Group: | Genetics |
| Research Field: | Population, Ecological and Evolutionary Genetics |
| Objective Division: | Environment |
| Objective Group: | Flora, Fauna and Biodiversity |
| Objective Field: | Forest and Woodlands Flora, Fauna and Biodiversity |
| Author: | Worth, JRP (Dr James Worth) |
| ID Code: | 94727 |
| Year Published: | 2013 |
| Web of Science® Times Cited: | 8 |
| Deposited By: | Plant Science |
| Deposited On: | 2014-09-16 |
| Last Modified: | 2014-10-13 |
| Downloads: | 0 |
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