Can DNA barcoding accurately discriminate megadiverse Neotropical freshwater fish fauna?

BMC Genetics

Claudio Oliveira²  Fausto Foresti²  Robert Hanner¹  Luiz HG Pereira² 

[1] Biodiversity Institute of Ontario and Department of Integrative Biology, University of Guelph, Guelph, ON, Canada;Laboratory of Biology and Genetic of Fish, Department of Morphology, Biosciences Institute, State University of São Paulo, São Paulo, Brazil

关键词: Biodiversity.;    Overlooked species;    Siluriformes;    Characiformes;    COI;    Upper Paraná River basin;   

Others  :  1087289
DOI  :  10.1186/1471-2156-14-20

 received in 2012-08-20, accepted in 2013-03-05,  发布年份 2013

【 摘 要 】

Background

The megadiverse Neotropical freshwater ichthyofauna is the richest in the world with approximately 6,000 recognized species. Interestingly, they are distributed among only 17 orders, and almost 80% of them belong to only three orders: Characiformes, Siluriformes and Perciformes. Moreover, evidence based on molecular data has shown that most of the diversification of the Neotropical ichthyofauna occurred recently. These characteristics make the taxonomy and identification of this fauna a great challenge, even when using molecular approaches. In this context, the present study aimed to test the effectiveness of the barcoding methodology (COI gene) to identify the mega diverse freshwater fish fauna from the Neotropical region. For this purpose, 254 species of fishes were analyzed from the Upper Parana River basin, an area representative of the larger Neotropical region.

Results

Of the 254 species analyzed, 252 were correctly identified by their barcode sequences (99.2%). The main K2P intra- and inter-specific genetic divergence values (0.3% and 6.8%, respectively) were relatively low compared with similar values reported in the literature, reflecting the higher number of closely related species belonging to a few higher taxa and their recent radiation. Moreover, for 84 pairs of species that showed low levels of genetic divergence (<2%), application of a complementary character-based nucleotide diagnostic approach proved useful in discriminating them. Additionally, 14 species displayed high intra-specific genetic divergence (>2%), pointing to at least 23 strong candidates for new species.

Conclusions

Our study is the first to examine a large number of freshwater fish species from the Neotropical area, including a large number of closely related species. The results confirmed the efficacy of the barcoding methodology to identify a recently radiated, megadiverse fauna, discriminating 99.2% of the analyzed species. The power of the barcode sequences to identify species, even with low interspecific divergence, gives us an idea of the distribution of inter-specific genetic divergence in these megadiverse fauna. The results also revealed hidden genetic divergences suggestive of reproductive isolation and putative cryptic speciation in some species (23 candidates for new species). Finally, our study constituted an important contribution to the international Barcoding of Life (iBOL.org) project, providing barcode sequences for use in identification of these species by experts and non-experts, and allowing them to be available for use in other applications.

【 授权许可】

   
2013 Pereira et al.; licensee BioMed Central Ltd.

【 图 表 】

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