Species complex delimitation and patterns of population structure at different geographic scales in Neotropical silver catfish (Rhamdia: Heptapteridae)

Ríos, Néstor; Bouza, Carmen; Gutiérrez, Verónica; García, Graciela

doi:10.1007/s10641-017-0622-1

Cited by 12 publications

(30 citation statements)

References 48 publications

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“…Although the MOTUs have been well established, the high intraspecific divergence rates can also be a consequence of the existence of different geographically isolated populations (Hebert et al., ) and are expected in species with the highest taxonomic uncertainties and a wide geographic distribution. Phylogenetic analysis has allowed the identification of four MOTUs that correspond to three nominal species (which corroborate that R. voulezi and R. branneri are valid species), supporting the results of a recent study, which used cytochrome b to identify seven new potentially cryptic species in the R. quelen species complex in the main lagoons and rivers of Uruguay and Argentina (Ríos et al., ).…”

Section: Discussionsupporting

confidence: 77%

“…(). In addition, the absence of the barcode gap also indicates the presence of cryptic species, which is supported by previous studies that suggested that R. quelen is a complex of species (Perdices et al., ; Ríos, Bouza, Gutiérrez & García, ). This absence of a barcode gap also suggests the risk of hybrid production among valid species, such as R. voulezi , R. branneri and R. quelen , due to aquaculture activity in southern Brazil.…”

Section: Discussionsupporting

confidence: 76%

“…However, the ability to identify pure and hybrid lineages is essential to the improvement, management and conservation of native species (Allendorf, Leary, Spruell & Wenburg, ). Despite the great relevance of “jundiá” for aquaculture, the current taxonomic classification of R. quelen is confusing and likely represents a complex of species (Ribolli et al., ; Ríos et al., ).…”

Section: Discussionmentioning

confidence: 99%

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DNA barcoding reveals blend of silver catfishRhamdiaspecies from fish farms in Southern Brazil

2018

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Rhamdia quelen is the most produced native freshwater fish in fish farms in South Brazil. Until recently, Rhamdia branneri and Rhamdia voulezi were synonyms of R. quelen, and all the species are commercialized as silver catfish (locally called jundiá or bagre sapo) by the aquaculture industry. In fact, because these species are morphologically very similar, interspecific crosses easily might occur in fish farming. We employed standard DNA barcoding to identify jundiá molecular operational taxonomic units (MOTUs) in fish cultivated and commercialized in the industry and in possible escapees in the natural environment in southern Brazil. We analysed 48 individuals from six fish farms and 48 individuals from three rivers (Uruguay, Benedito Novo and Itapocu Rivers) using the mitochondrial cytochrome oxidase subunit I (COI). Four MOTUs were identified based on the estimated optimum threshold (OT = 0.77), and these MOTUs were concordant with Bayesian Inferece (BI) and Neighbour‐Joining (NJ) trees. Our results support the existence of at least three species in our dataset: R. branneri, R. voulezi, and R. quelen 1 and R. quelen 2. The interspecific genetic divergence ranged from 1.1% to 5.1% (mean = 3.5%), and the intraspecific distance ranged from 0% to 1.4% (mean = 0.24%). The presence of cultivated fish in the Uruguay and Benedito Novo Rivers provides evidence of genetic contamination in native populations. These results show the need to regulate aquaculture activities and to characterize the species and commercial lineages of silver catfish that are cultivated in South Brazil.

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Section: Discussionsupporting

confidence: 77%

Section: Discussionsupporting

confidence: 76%

Section: Discussionmentioning

confidence: 99%

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DNA barcoding reveals blend of silver catfishRhamdiaspecies from fish farms in Southern Brazil

2018

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“…In the first systematic revision of the Rhamdia genus, more than 100 species were synonymized, 46 of which were synonymized with R. quelen [13]. Previous studies on this species based on mitochondrial DNA (mtDNA) data suggested different mtDNA lineages [11,14,15], while other authors provided morphological evidence supporting sister species previously included in R. quelen [10,16]. Those studies were based on two different mitochondrial markers, cytochrome b (cytb) and cytochrome c oxidase subunit I (COI); however, analyses at different geographical scales based on both markers have not been performed to date.…”

mentioning

confidence: 99%

“…Those studies were based on two different mitochondrial markers, cytochrome b (cytb) and cytochrome c oxidase subunit I (COI); however, analyses at different geographical scales based on both markers have not been performed to date. Five R. quelen cytb mtDNA lineages (Rq2, Rq4, Rq5a, Rq5b and Rq6) have been identified in the basin system encompassing the La Plata Basin, Patos-Merin lagoon Basin, as well as rivers and lagoons draining to the SW Atlantic Ocean (altogether LP-PM-AO) [14]. Microsatellite data provided evidence of hybridization and introgression between two mtDNA lineages (Rq4 and Rq6) in several basins of this region (Uruguay River, Negro River and Merin Lagoon basins) [17].…”

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confidence: 99%

Population Genomics in Rhamdia quelen (Heptapteridae, Siluriformes) Reveals Deep Divergence and Adaptation in the Neotropical Region

Ríos

Casanova

Hermida

et al. 2020

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Rhamdia quelen, a Neotropical fish with hybridization between highly divergent mitochondrial DNA (mtDNA) lineages, represents an interesting evolutionary model. Previous studies suggested that there might be demographic differences between coastal lagoons and riverine environments, as well as divergent populations that could be reproductively isolated. Here, we investigated the genetic diversity pattern of this taxon in the Southern Neotropical Basin system that includes the La Plata Basin, Patos-Merin lagoon basin and the coastal lagoons draining to the SW Atlantic Ocean, through a population genomics approach using 2b-RAD-sequencing-derived single nucleotide polymorphisms (SNPs). The genomic scan identified selection footprints associated with divergence and suggested local adaptation environmental drivers. Two major genomic clusters latitudinally distributed in the Northern and Southern basins were identified, along with consistent signatures of divergent selection between them. Population structure based on the whole set of loci and on the presumptive neutral vs. adaptive loci showed deep genomic divergence between the two major clusters. Annotation of the most consistent SNPs under divergent selection revealed some interesting candidate genes for further functional studies. Moreover, signals of adaptation to a coastal lagoon environment mediated by purifying selection were found. These new insights provide a better understanding of the complex evolutionary history of R. quelen in the southernmost basin of the Neotropical region.

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Past hybridisation and introgression erased traces of mitochondrial lineages evolution in the Neotropical silver catfish Rhamdia quelen (Siluriformes: Heptapteridae)

2018

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Species complex delimitation and patterns of population structure at different geographic scales in Neotropical silver catfish (Rhamdia: Heptapteridae)

Cited by 12 publications

References 48 publications

DNA barcoding reveals blend of silver catfishRhamdiaspecies from fish farms in Southern Brazil

DNA barcoding reveals blend of silver catfishRhamdiaspecies from fish farms in Southern Brazil

Population Genomics in Rhamdia quelen (Heptapteridae, Siluriformes) Reveals Deep Divergence and Adaptation in the Neotropical Region

Past hybridisation and introgression erased traces of mitochondrial lineages evolution in the Neotropical silver catfish Rhamdia quelen (Siluriformes: Heptapteridae)

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