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Montane refugia isolation and plateau population expansion:Phylogeography of Sino‐Himalayan endemic Spenceria ramalana (Rosaceae)

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Climate oscillations and landscape heterogeneity make the historical population processes of organisms of
the Qinghai–Tibet Plateau quite complex. We used chloroplast DNA sequences and amplified fragment length
polymorphism (AFLPs) to study the phylogeography and genetic variation of the Qinghai–Tibet Plateau endemic
Spenceria ramalana Trimen. The parsimony network contains two star‐like evolutionary units, nested into two nested
clades, coinciding with geographic population groups indicated by SAMOVA software. The central group shows genetic
homogeneity, indicating a bottleneck or founder effect of population dynamics. Margin groups contribute more
haplotype diversity (CT), indicating potential refugia. Several expansion events during several interglacial periods
were detected. The latest expansion of the eastern population contributed to the modern population structure of the
central area. Four AFLP clusters were detected. Higher CT, a relict pattern of haplotype distribution and DW values of marginal populations, confirmed the location of potential montane refugia. Relict distribution pattern, nested clade phylogeographic analysis conclusions, and restricted gene flow detected by AFLPs indicated an isolation pattern of the populations of montane areas. Heterogeneity of landscape of the western and southern montane areas could be the main barrier for gene flow. Moisture conditions and ecotype transformation might help to build the phylogeographic pattern of this species. Neither chloroplast DNA markers nor AFLP was able to differentiate the two varieties of this species.

Key words ecotype transformation, phylogeography, population expansion, Qinghai–Tibet Plateau, refugia,
Spenceria ramalana.

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Ketersediaan

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Informasi Detail

Judul Seri

Journal of Systematics and Evolution

No. Panggil

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Penerbit

: Institute of Botany., 2014

Deskripsi Fisik

Journal of Systematics and Evolution 52 (3): 326–340 (2014)

Bahasa

English

ISBN/ISSN

doi: 10.1111/jse.120

Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

BIOLOGI

Info Detail Spesifik

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Pernyataan Tanggungjawab

Wati/Agus

Versi lain/terkait

Lampiran Berkas

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