Abstract Detail


Li, Jianhua [1], Del Tredici, Peter [2], Lemmon, Alan [3], Lemmon, Emily [3], Zhao, Yunpeng [4], Fu, Chengxin [5].

Allopatric Speciation Produced Diversity Anomaly between Eastern Asia and Eastern North America: Evidence from Anchored Phylogenomics of Stewartia (Theaceae).

Diversity anomaly between eastern Asia and eastern North America has long attracted much attention of biologists and biogeographers and may have resulted from the greater physiographical heterogeneity in conjunction with climate and sea level changes in eastern Asia. However, few empirical studies have been done to test explicitly the association between species diversity and allopatric events. Stewartia is one of the plant genera with the eastern Asian-eastern North American disjunction and diversity anomaly between the two regions; however, interspecific phylogeny has not been resolved due to insufficient data. Here we sampled most of the species of Stewartia and generated DNA sequences of over 500 nuclear loci using the anchored phylogenomic approach. Our parsimony and Bayesian analyses produced congruent phylogenies with high resolution for interspecific relationships of Stewartia. Speciation in Asia was mostly allopatric between the Japanese islands and the Asian continent in the late Miocene and early Pliocene, while the two eastern North American species represent lineages of different times with S. malacodendron being the first lineage splitting from the remaining species of Stewartia and S. ovata being most closely related to deciduous species of Asian Stewartia. The results provide direct evidence for the importance of allopatry in the differential diversity between eastern Asia and eastern North America.

1 - Hope College, Biology, 35 E 12th Street, Holland, MI, 49423, United States
2 - 125 Arborway, Jamaica Plain, MA, 02130, United States
3 - Florida State University, 89 Chieftain Way, Biology Unit 1, Tallahassee, FL, 32306-4295, USA
4 - Zhejiang University, College Of Life Sciences, 866 Yuhangtang Rd, Hangzhou, Zhejiang, 310058, China
5 - Zhejiang University, Dept Of Biology, Yuhangtang Road 866,, Hangzhou, 310058, China

Anchored hybrid enrichment
anomaly of diversity
eastern Asia-eastern North American disjunction

Presentation Type: Poster
Number: PSY004
Abstract ID:265
Candidate for Awards:None

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