Yu, Chih Chieh , Chung, Kuo-Fang .
Phylogeny,historical biogeography, and patterns of diversification for Berberis (Berberidaceae).
Berberis s.l. (including Mahonia), a strongly supported clade comprising some 450 species, is distributed worldwide in the Mediterranean,temperate, and alpine biomes. To understand the historical biogeography of this group, molecular dating and ancestral area reconstruction were performed using phylogenies reconstructed based on 5 chloroplast (rbcL, ycf6-psbM, rpoB-trnC, psbA-trnH and rpl32-trnL) markers and nuclear ITS DNA sequences. Comparing with the fossil sequence data, molecular dating suggests a late Paleogene origin for the crown of the genus. However, most of the species diversity in the genus appears to be result of very recent (late Neogene) radiations. Within the temperate and alpine lineages of Berberiss.s., species with deciduous habit were originated in early and late Neogene, respectively. Sect. Wallichianae,a species-rich clade characterized by its evergreen habit, appears to have derived from within the deciduous lineage in the late Neogene. Phylogenetic relationships and molecular dating also suggest that both the oceanic dispersal and Bering Land Bridges in the Neogene could be responsible for the disjunct taxa in North America and Eurasia, while species in northern Africa and west Pacific islands were derived from long distance dispersal. Species diversity with the genus reflects different climatic patterns and geological events with the late Paleogene and Neogene, especially the onset of glaciations and the environmental differences associated with the alpine and the Mediterranean climates.
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1 - No. 1, Sec. 4, Roosevelt Road. Forestry Building, Room 318, Taipei, N/A, 106, Taiwan
2 - National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, N/A, 10617, Taiwan
Presentation Type: Poster:Posters for Topics
Location: Battelle South/Convention Center
Date: Monday, July 9th, 2012
Time: 5:30 PM