| Abstract Detail
Biogeography YU, Chih Chieh [1], Chung, Kuo-Fang [2]. Molecular phylogenetics, historical biogeography, and diversification of Berberis s.l. (Berberidaceae). Berberis s.l, comprising about 500-600 species of unifoliolate, pinnately compound-leaved shrubs or small trees, is distributed widely in world’s deserts, temperate and alpine habitats, but having two main diversity centers in Asian Himalayas and South American Andes. To understand the origin of the high diversity in alpine environments of this taxonomic group, molecular dating and ancestral area reconstruction (LAGRANGE) were performed based on the molecular phylogeny reconstructed by six chloroplast markers (rbcL, ycf6-psbM, rpoB-trnC, psbA-trnH, trnS-trnG and rpl32-trnL) and nuclear ITS sequences. Using multiple fossil calibrations, molecular dating suggests a relatively old origin (late Paleogene) of Berberis s.l.; however, most of the alpine species show to be undergone a series of rapid evolution events occurring in late Neogene. This species diversification pattern can be mainly explained by the increase of the suitable habitats after the period of Neogene (i.e. subalpine-alpine environment) due to the global frequent orogenies as well as the climate deterioration. On the other hand, together with the outcome of LAGRANGE, our dating analysis also confirms the modern biogeographic disjunctions within the genus are both shaped by long distance dispersals and a series of Neogene vicariance events. Therefore, Berberis s.l. is thought to be one of the largest high-elevational radiations in the basal eudicots, and earns itself an ideal study group to address the fundamental evolutionary questions as well as the assembly history of global high-mountain flora.
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1 - No. 1, Sec. 4, Roosevelt Road. Forestry Building, Room 318, Taipei, N/A, 106, Taiwan
2 - Academia Sinica , Biodiversity Research Center, No.128, Sec. 2, Academia Rd., Nangang Dist., Taipei, 106, TAIWAN
Keywords:
Mahonia
Molecular dating
disjunctions
basal eudicot.
Presentation Type: Oral Paper
Session: 37, Biogeography II
Location: 103/Savannah International Trade and Convention Center
Date: Wednesday, August 3rd, 2016
Time: 9:15 AM
Number: 37006
Abstract ID:604
Candidate for Awards:None |
