title: Genetic differentiation and cryptic speciation in natural populations of Drosophila lacertosa.
abstract: Drosophila lacertosa, an Oriental member of the robusta species group in the virilis-repleta radiation, has a wide distribution from northern India throughout China to the Far East. Phylogenetic analyses of mitochondrial ND2 gene sequences revealed two genetically significantly diverged lineages with 2.1% DNA sequence divergence. These two lineages are largely allopatric: one is mainly found in southwest China (lineage A), whereas the other ranges central and east of China to northeast Asia (lineage B). The geographic distributions of these two clades narrowly overlap near the provincial boundaries of Yunnan and Guizhou or Guangxi, probably as a consequence of population expansion and secondary contact. These two lineages were estimated to have diverged about 0.56 Mya, and the estimated time of expansion was approximately 70,000 years ago for lineage A population, and 110,000 years ago for lineage B population. The present molecular analysis, together with nearly complete reproductive isolation between those two lineages, strongly suggests that the two lineages might be incipient species.
authors.affiliation: Laboratory of Cellular and Molecular Evolution, and Molecular Biology of Domestic Animals, Kunming Institute of Zoology, The Chinese Academy of Sciences, Kunming 650223, China.
authors.forename: Li-ping
authors.initials: LP
authors.lastname: He
authors.forename: Hideaki
authors.initials: H
authors.lastname: Watabe
authors.forename: Jinggong
authors.initials: J
authors.lastname: Xiangyu
authors.forename: Jian-jun
authors.initials: JJ
authors.lastname: Gao
authors.forename: Xing-cai
authors.initials: XC
authors.lastname: Liang
authors.forename: Tadashi
authors.initials: T
authors.lastname: Aotsuka
authors.forename: Ya-ping
authors.initials: YP
authors.lastname: Zhang
mesh_terms: D000818:Animals; D001483:Base Sequence; D016000:Cluster Analysis; D004272:DNA, Mitochondrial / Q000235:genetics; D003710:Demography; D004330:Drosophila / Q000235:genetics*; D005202:Asia, Eastern; D049810:Genetic Speciation; D014644:Genetic Variation; D005828:Genetics, Population; D006239:Haplotypes / Q000235:genetics; D008969:Molecular Sequence Data; D010802:Phylogeny; D017422:Sequence Analysis, DNA; D013045:Species Specificity
chemical_list: D004272:DNA, Mitochondrial