TY - JOUR

T1 - Untangling taxonomic confusion and diversification patterns of the Streak-breasted Scimitar Babblers (Timaliidae: Pomatorhinus ruficollis complex) in southern Asia

AU - Reddy, Sushma

AU - Sharief, Sarah

AU - Yohe, Laurel R.

AU - Witkowski, Julie

AU - Hosner, Peter A.

AU - Nyári, Árpád S.

AU - Moyle, Robert G.

PY - 2015

Y1 - 2015

N2 - Biodiversity patterns in Asia are poorly understood due to inferences drawn from incorrect taxonomy and limited survey effort. The Streak-breasted Scimitar Babblers (Pomatorhinus ruficollis complex) have a wide distribution across southern Asia and exhibit a high degree of plumage variability within and among populations. Continued use of traditional subspecies designations over revised species-limits based on plumage and DNA sequence data furthers confusion in this group and obscures complex biogeographic patterns. In this study, we combined previously published DNA sequences with newly sampled populations to produce a comprehensive dataset for the ruficollis complex. Phylogenetic analysis of these data confirms that traditional subspecies based on plumage alone are paraphyletic and therefore not good descriptors of evolutionary history. With increased sampling, our study supported previous delimitations of phylogenetic species as distinct units, refined the range limits of two taxa - P. reconditus (throughout central China) and P. nigrostellatus (Hainan, Guangxi, N Vietnam), showed two additional clades that may be distinct species, and uncovered a 'suture' zone where populations of multiple species occur in the same localities. Diversification within the ruficollis complex indicates a clade of Sino-Himalayan and SE Asian species sister to a clade distributed in central and southern China species. The 'suture' zone where different ruficollis species are in contact coincides with the meeting of these four major geographic areas in a highly geomorphologically complex region.

AB - Biodiversity patterns in Asia are poorly understood due to inferences drawn from incorrect taxonomy and limited survey effort. The Streak-breasted Scimitar Babblers (Pomatorhinus ruficollis complex) have a wide distribution across southern Asia and exhibit a high degree of plumage variability within and among populations. Continued use of traditional subspecies designations over revised species-limits based on plumage and DNA sequence data furthers confusion in this group and obscures complex biogeographic patterns. In this study, we combined previously published DNA sequences with newly sampled populations to produce a comprehensive dataset for the ruficollis complex. Phylogenetic analysis of these data confirms that traditional subspecies based on plumage alone are paraphyletic and therefore not good descriptors of evolutionary history. With increased sampling, our study supported previous delimitations of phylogenetic species as distinct units, refined the range limits of two taxa - P. reconditus (throughout central China) and P. nigrostellatus (Hainan, Guangxi, N Vietnam), showed two additional clades that may be distinct species, and uncovered a 'suture' zone where populations of multiple species occur in the same localities. Diversification within the ruficollis complex indicates a clade of Sino-Himalayan and SE Asian species sister to a clade distributed in central and southern China species. The 'suture' zone where different ruficollis species are in contact coincides with the meeting of these four major geographic areas in a highly geomorphologically complex region.

KW - Asia

KW - Biogeography

KW - Birds

KW - Phylogenetics

KW - Species-limits

KW - Taxonomy

U2 - 10.1016/j.ympev.2014.10.013

DO - 10.1016/j.ympev.2014.10.013

M3 - Journal article

C2 - 25450499

AN - SCOPUS:84909979109

VL - 82

SP - 183

EP - 192

JO - Molecular Phylogenetics and Evolution

JF - Molecular Phylogenetics and Evolution

SN - 1055-7903

IS - Part A

ER -