Date: 19 Jan 2007
Phylogenetic relationships of the Chinese sisorid catfishes: a nuclear intron versus mitochondrial gene approach
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Several recent molecular phylogenetic studies of the sisorid catfishes (Sisoridae) have challenged some aspects of their traditional taxonomy and cladistic hypotheses of their phylogeny. However, disagreement with respect to relationships within this family in these studies highlights the need for additional data and analyses. Here we subjected 15 taxa representing 12 sisorids genera to comprehensive phylogenetic analyses using the second intron of low-copy nuclear S7 ribosomal protein (rpS7) gene and the mitochondrial 16S rRNA gene segments both individually and in combination. The competing sisorid topologies were then tested by using the approximately unbiased (AU) test and the Shimodaira–Hasegawa (SH) test. Our results support previously suggested polyphyly of Pareuchiloglanis. The genus Pseudecheneis is likely to be nested in the glyptosternoids and Glaridoglanis might be basal to the tribe Glyptosternini. However, justified by AU and SH test, the sister-group relationship between Pseudecheneis and the monophyletic glyptosternoids cannot be rejected based on the second intron of rpS7 gene and combined data analyses. It follows that both gene segments are not suitable for resolving the phylogenetic relationships within the sisorid catfishes. Overall, the second intron of rpS7 gene yielded poor phylogenetic performance when compared to 16S rRNA gene, the evolutionary hypothesis of which virtually agreed with the combined data analyses tree. This phenomenon can be explained by the insufficient length and fast saturation of substitutions in the second intron of rpS7 gene, due to substitution patterns such as frequent indels (insertion/deletion events) of bases in the sequences during the evolution.
Handling editor: C. Sturmbauer
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- Phylogenetic relationships of the Chinese sisorid catfishes: a nuclear intron versus mitochondrial gene approach
Volume 579, Issue 1 , pp 55-68
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- Print ISSN
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- Kluwer Academic Publishers
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- S7 ribosomal protein gene
- 16S rRNA
- Industry Sectors
- Author Affiliations
- 1. Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, P. R. China
- 2. Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, P. R. China
- 3. School of Life Science, Southwest University, Chongqing, 400715, P. R. China