Integrative taxonomy of two thrush complexes (Aves: Turdidae) reveals introgression across sister species
semanticscholar(2021)
摘要
The classification of some Turdus species, such as the Naumann’s and
dusky thrush complexes and the red-throated and black-throated thrush
complexes, is controversial. Herein, we used molecular data
(mitochondrial genes and microsatellite loci) and morphological
characters to review the taxonomy of these thrush complexes and analyze
the genetic differentiation between them. Our phylogenetic analysis
based on mitochondrial genes indicated that all haplotypes could be
divided into two reciprocally monophyletic sister clades corresponding
to these two thrush complexes. The same results were revealed by
coalescence-based species delimitation. Therefore, these two thrush
complexes should be divided into two separate species (T. naumanni and
T. ruficollis) and include two subspecies per species according to
combined characters from morphological analyses and multilocus
approaches. The above classifications were also supported by an analysis
of genetic differentiation between T. naumanni and T. ruficollis and
within each species. Moreover, there was significant mixing between
these two thrush species in the neighbor-joining (NJ) tree and the
cluster analysis of microsatellite loci. This led to a pattern of
nuclear-mitochondrial discordance between the two species. This could be
the result of extensive nuclear introgression between these two sister
species. We also provide a potential explanation for the mechanism of
gene introgression and nuclear-mitochondrial discordance between the two
bird species.
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关键词
thrush complexes,sister species,turdidae,integrative taxonomy
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