Abstract
Molecular identification through DNA barcoding has been proposed as a way to standardize a global biodiversity identification system using a partial sequence of the mitochondrial COI gene. We applied an integrative approach using DNA barcoding and traditional morphology-based bioassessment to identify fish from a neotropical region possessing low taxonomic knowledge: the Jequitinhonha River Basin (Southeastern Brazil). The Jequitinhonha River Basin (JRB) has a high rate of endemism and is considered an area of high priority for fish conservation, with estimates indicating the presence of around 110 native and non-indigenous species. DNA barcodes were obtained from 260 individuals belonging to 52 species distributed among 35 genera, 21 families and 6 orders, including threatened and rare species such as Rhamdia jequitinhonha and Steindachneridion amblyurum. The mean Kimura two-parameter genetic distances within species, genera and families were: 0.44, 12.16 and 20.58 %, respectively. Mean intraspecific genetic variation ranged from 0 to 11.43 %, and high values (>2 %) were recovered for five species. Species with a deep intraspecific distance, possibly flagging overlooked taxa, were detected within the genus Pimelodella. Fifteen species, only identified to the genus level, had unique BINs, with a nearest neighbor distance over 2 % and therefore, potential new candidate species supported by DNA barcoding. The integrative taxonomy approach using DNA barcoding and traditional taxonomy may be a remedy to taxonomy impediment, accelerating species identification by flagging potential new candidate species and to adequately conserve the megadiverse neotropical ichthyofauna.
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Acknowledgments
We are grateful to Naiara G. Sales, Tobias A. Barroso, Iago S. Penido, Guilherme M. Santos, Gilberto N. Salvador and Amarildo A. Rodrigues for help in the fieldwork. Luisa M. Sarmento-Soares and Ronaldo F. M. Pinheiro for sharing data from Professor Mello Leitão Museum. DCC is grateful to Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for his productivity fellowship (308537/2014-9). This work was funded by the Brazilian Barcode of Life Network BrBol/CNPq (564953/2010-5), Coordenação de Aperfeiçoamento de Pessoal do Ensino Superior (CAPES—PRÓ EQUIPAMENTOS grant number 783380/2013), Conselho Nacional de Desenvolvimento Científico e Tecnológico—CNPq (process numbers INCT 573899/2008-8 and 482852/2011-9) and Fundação de Amparo à Pesquisa do Estado de Minas Gerais—FAPEMIG (process number INCT APQ-0084/08).
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Pugedo, M.L., de Andrade Neto, F.R., Pessali, T.C. et al. Integrative taxonomy supports new candidate fish species in a poorly studied neotropical region: the Jequitinhonha River Basin. Genetica 144, 341–349 (2016). https://doi.org/10.1007/s10709-016-9903-4
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DOI: https://doi.org/10.1007/s10709-016-9903-4