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DNA Barcoding Identifies Argentine Fishes from Marine and Brackish Waters

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DNA Barcoding Identifies Argentine Fishes from Marine and Brackish Waters DNA Barcoding Identifies Argentine Fishes from Marine and Brackish Waters Ezequiel Mabragan˜ a1,2*, Juan Martı´nDı´az de Astarloa1,2, Robert Hanner3, Junbin Zhang4, Mariano Gonza´lez Castro1,2 1 Laboratorio de Biotaxonomı´a Morfolo´gica y Molecular de Peces, Instituto de Investigaciones Marinas y Costeras, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, Mar del Plata, Argentina, 2 Consejo Nacional de Investigaciones Cientı´ficas y Te´cnicas, Argentina, 3 Biodiversity Institute of Ontario and Department of Integrative Biology, University of Guelph, Ontario Canada, 4 College of Fisheries and Life Science, Shanghai Ocean University, Shanghai Abstract Background: DNA barcoding has been advanced as a promising tool to aid species identification and discovery through the use of short, standardized gene targets. Despite extensive taxonomic studies, for a variety of reasons the identification of fishes can be problematic, even for experts. DNA barcoding is proving to be a useful tool in this context. However, its broad application is impeded by the need to construct a comprehensive reference sequence library for all fish species. Here, we make a regional contribution to this grand challenge by calibrating the species discrimination efficiency of barcoding among 125 Argentine fish species, representing nearly one third of the known fauna, and examine the utility of these data to address several key taxonomic uncertainties pertaining to species in this region. Methodology/Principal Findings: Specimens were collected and morphologically identified during crusies conducted between 2005 and 2008. The standard BARCODE fragment of COI was amplified and bi-directionally sequenced from 577 specimens (mean of 5 specimens/species), and all specimens and sequence data were archived and interrogated using analytical tools available on the Barcode of Life Data System (BOLD; www.barcodinglife.org). Nearly all species exhibited discrete clusters of closely related haplogroups which permitted the discrimination of 95% of the species (i.e. 119/125) examined while cases of shared haplotypes were detected among just three species-pairs. Notably, barcoding aided the identification of a new species of skate, Dipturus argentinensis, permitted the recognition of Genypterus brasiliensis as a valid species and questions the generic assignment of Paralichthys isosceles. Conclusions/Significance: This study constitutes a significant contribution to the global barcode reference sequence library for fishes and demonstrates the utility of barcoding for regional species identification. As an independent assessment of alpha taxonomy, barcodes provide robust support for most morphologically based taxon concepts and also highlight key areas of taxonomic uncertainty worthy of reappraisal. Citation: Mabragan˜aE,Dı´az de Astarloa JM, Hanner R, Zhang J, Gonza´lez Castro M (2011) DNA Barcoding Identifies Argentine Fishes from Marine and Brackish Waters. PLoS ONE 6(12): e28655. doi:10.1371/journal.pone.0028655 Editor: Vincent Laudet, Ecole Normale Supe´rieure de Lyon, France Received March 9, 2011; Accepted November 12, 2011; Published December 9, 2011 Copyright: ß 2011 Mabragan˜a et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Funding: This research was supported through funding to Consejo Nacional de Investigaciones Cientı´ficas y Te´cnicas, under the Argentina iBOL funds, Comisio´n de Investigaciones Cientı´ficas and Universidad Nacional de Mardel Plata funds (Argentina), and through funding to the Canadian Barcode of Life Network from Genome (through the Ontario Genomics Institute) and Natural Sciences and Engineering Research Council of Canada. The funders have no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. Competing Interests: The authors have declared that no competing interests exist. * E-mail: [email protected] Introduction [6], although it is not intended to replace classical taxonomy [1]. Its purpose is to facilitate species identifications by non-experts and to Despite ongoing scientific debate concerning the role of molecular do so in a rapid and cost-effective manner [7]. The effectiveness of methods in taxonomy DNA barcoding has emerged as a widely barcoding has been demonstrated in diverse taxa, including accepted tool for species identification because of its enhanced focus springtails [8], spiders [9], butterflies [2,3,10–12], flies [13], bivalves on standardization and data validation [1]. Barcoding [2–4] seeks to [14], fishes [15], birds [16,17] and mammals [18–20], with extend species identification capabilities by using short, standardized barcoding systems also now being established for plants [21], gene regions for the efficient and cost-effective identification of macroalgae [22], and bacteria [23]. eukaryotes. Advocating the use of an easily characterized 648 bP The Fish Barcode of Life campaign (FISH-BOL) [24] seeks to fragment from the mitochondrial 59 region of the cytochrome c establish a standard reference sequence library for the molecular oxidase subunit I (COI) gene for animal identification, the primary identification of fishes worldwide [25]. The identification process goal of barcoding focuses on the assembly of reference sequence using COI sequence data for fishes is promising, as supported by libraries derived from expert-identified voucher specimens in order recent examples of its application. DNA barcoding surveys of 207 to develop reliable molecular tools for species identification in nature Australian marine fish species [15] and 210 Australasian shark and [5]. Barcoding has been mischaracterized as molecular taxonomy ray species [26] have concluded that DNA barcoding can be used PLoS ONE | www.plosone.org 1 December 2011 | Volume 6 | Issue 12 | e28655 DNA Barcoding of Argentine Fishes for both teleost and chondricthyan species identification. Hubert et specimens are generally recalcitrant to DNA analyses due to of al. [5] were able to distinguish 93% of 190 Canadian freshwaters their fixation in formalin, a dedicated collecting effort of fresh fishes using the mitochondrial DNA COI gene. Steinke et al. [27] material was required from Argentinean waters. We examined demonstrated that sequence variability in the barcode region the patterns of barcode sequence divergence among 577 permitted discrimination of 98% of 201 fish species from the specimens identified as belonging to 125 fish species, representing Canadian Pacific. Ward and Holmes [28] analysed the DNA nearly one third of the known fauna [33,35,43]. The investigation barcode region in 388 species of fishes, including 4 holocephali not only provides the potential use of DNA barcoding as a tool to and 61 elasmobranchs showing the discrimination of 98–99% of aid traditional taxonomy in the identification of Argentinean fish species examined thus far. In addition, barcodes were marine fish species, but also explores the application of DNA subsequently used to identify marine fish larvae from Australian barcodes to flag overlooked species and discusses the potential [29,30] and Antarctic [31] waters. limitations inherent to the existing morphologically-based taxo- The ichthyofauna of the Argentine continental shelf is well nomic system. known due to information obtained by large foreign expeditions and local research cruises since the early twentieth Century [32– Materials and Methods 35, 36 and references therein]. However, taxonomic resolution remains elusive for some challenging groups, and new species Ethics Statement remain to be discovered as evidenced by the ongoing description All tissue samples were extracted from specimens that were of new species [35,37–42]. collected as part of other biological studies carried out with The aim of this study is to extend barcode coverage to appropriate permissions from local authorities: Comisio´n de Argentine marine and brackish water fishes. Because museum Investigaciones Cientı´ficas de la Provincia de Buenos Aires, Figure 1. Collection sites for specimens examined in this study. Black triangles correspond to northern samples, shelf of Buenos Aires province; green circle correspond to samples collected in Mar Chiquita coastal lagoon; red triangles correspond to samples of inner shelf of Patagonian waters, and blue circles, samples of outer shelf of Patagonian waters. Numbers are provided to facilitate species collection sites of table 2. doi:10.1371/journal.pone.0028655.g001 PLoS ONE | www.plosone.org 2 December 2011 | Volume 6 | Issue 12 | e28655 DNA Barcoding of Argentine Fishes Table 1. Polymorphic nucleotide sites in the COI, haplotype presently studying or has reviewed the group in the region in designation (Hd) and absolute haplotype frequency (n), for question’’ and Level 2: ‘‘identification made with high degree of specimens of Psammobatis normani and P. rudis. confidence at all levels—specimen identified by a trained identifier who had prior knowledge of the group in the region or used available literature to identify the specimen’’. Some of the specimens were deposited in the fish collection of INIDEP; the Hd n Position other specimens studied were kept only as e-voucher (See Table 133 160 457 493 501 S1). All sequence assemblies, electropherogram (trace) files, P. normani 3T T T G T primer sequences and specimen provenance data
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