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Abstract Detail



Systematics Section/ASPT

Xing, Yaowu [1], Ree, Richard [2].

Comparative phylogenetic analysis of angiosperm diversification in the Hengduan Mountains biodiversity hotspot.

Mountain ranges are well-represented in biodiversity hotspots, but the reasons for this are still not well understood. We address this question through comparative analyses of biogeographic history and lineage diversification using multiple time-calibrated phylogenies of plants that are well-represented in the flora of the Hengduan Mountains region (HMR), a biodiversity hotspot in SW China immediately east of the Himalayas. Ancestral range reconstruction showed many origins of HMR clades between 10-15 Ma, coinciding with Neogene uplift of the region. Diversification analyses indicated clades in the HMR exhibit higher net diversification rates through reduced extinction rather than increased speciation. Rates of dispersal out of the HMR were much higher than the reverse, indicating that the region acts as a source (“cradle”) more than a sink (“museum”) of plant diversity.


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1 - Field Museum of Natural History, Botany, 1400 S. Lake Shore Drive, Chicago, Illinois, 60615, USA
2 - Field Museum Of Natural History, Botany, 1400 S Lake Shore Drive, Chicago, IL, 60605, USA

Keywords:
biodiversity hotspot
diversification rates
biogeography
extinction
mountain radiation.

Presentation Type: Oral Paper:Papers for Sections
Session: 31
Location: Salon 4/The Shaw Conference Centre
Date: Tuesday, July 28th, 2015
Time: 8:00 AM
Number: 31001
Abstract ID:852
Candidate for Awards:George R. Cooley Award


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