Reproductive strategies and genetic variability in tropical freshwater fish

Lassala, Maria Dolores Peres; Renesto, Erasmo

doi:10.1590/s1415-47572007000400030

Cited by 18 publications

(9 citation statements)

References 23 publications

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“…Likewise, the microsatellite genetic diversity was slightly lower than that reported by Aguirre et al (2013) for mitochondrial DNA (mtDNA control region) in P. magdalenae (HD = 0.997). These results demonstrate the vagility of the P. magdalenae , in which the strong migratory behavior facilitates the maintenance of high levels of genetic variability, as in species of the genus Prochilodus (Lassala and Renesto, 2007; Santos et al , 2007). …”

Section: Discussionmentioning

confidence: 66%

Genetic diversity and population structure of bocachico Prochilodus magdalenae (Pisces, Prochilodontidae) in the Magdalena River basin and its tributaries, Colombia

Berdugo

Barandica

2014

Genet. Mol. Biol.

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Prochilodus magdalenae is an endemic freshwater fish that occurs in the Magdalena, Sinú and Atrato hydrographic basins. It has an important economic role and is a food resource for the artisanal fishing communities. Its socioeconomic importance contrasts with the current status of its fisheries, where stocks are being depleted. Considering its importance and lack of information on its genetic structure, we used seven microsatellite markers to assess the genetic structure of wild populations of P. magdalenae. The genetic diversity was assessed and the population genetic structure was estimated through Fst, analysis of molecular variance and Bayesian analysis. A total of 290 alleles were found in all loci throughout all population. The high polymorphism contrasts with the levels of observed heterozygosity (Ho = 0.276), which are the lowest values recorded for the family. We found three populations of bocachico coexisting throughout the studied system, contradicting the hypothesis that freshwater migratory fish form panmictic populations. These results on the genetic structure of P. magdalenae constitute tools for a better understanding of the behavior and biology of this species, contributing to fish management and conservation programs.

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Section: Discussionmentioning

confidence: 66%

Genetic diversity and population structure of bocachico Prochilodus magdalenae (Pisces, Prochilodontidae) in the Magdalena River basin and its tributaries, Colombia

Berdugo

Barandica

2014

Genet. Mol. Biol.

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“…A strong migratory behaviour, as in species of the genus Prochilodus, helps to keep high levels of genetic variability (Lassala and Renesto, 2007;Santos et al, 2007) and gene flow (Batista et al, 2005;Vergara and Garcia, 2008). In P. magdalenae, the ability to migrate is undoubtedly an important factor in preserving genetic structure at lower complex levels (Ward et al, 1992), and also demonstrates the degree of connectivity within the catchment of the Magdalena River, as there are no obvious barriers restricting the exchange of gene flow.…”

Section: Population Structurementioning

confidence: 99%

Mitochondrial DNA variation of the bocachico Prochilodus magdalenae (Characiformes, Prochilodontidae) in the Magdalena River Basin, Colombia

Aguirre-Pabón

Barandica

Castro

2013

Aquatic Conservation

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The bocachico Prochilodus magdalenae is a freshwater migratory species of great importance for conservation in Colombia. The populations of this fish have been seriously threatened in the last decade, and there is limited knowledge of its genetic conditions.In order to evaluate the genetic structure of P. magdalenae in the Magdalena River basin and some tributaries, the mitochondrial DNA control region was analysed in samples selected from 20 sites.In total, 189 polymorphic sites were detected on a sequence of 500 bp of the control region among 292 individuals, defining 233 haplotypes from which 88.41% were private. Genetic diversity was high (HD = 0.997 and π = 0.0303), neither the analysis of molecular variance, the Φst statistic, nor the Mantel test values revealed significant differences of population subdivision in any of the hierarchical levels. The tests of neutrality and mismatch distribution detected a population expansion in the Middle Pleistocene.Results showed that P. magdalenae forms a large panmictic population in the basin of the Magdalena River. A wide migratory capacity, the absence of geographical barriers and not enough time to accumulate genetic variation are likely reasons for the genetic homogeneity found in this species. Copyright © 2013 John Wiley & Sons, Ltd.

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“…In the paper, a superficial discussion based on molecular data is employed to explain the relationships between mitochondrial phylogenetics, biogeography and evolution of parental care that can be attached to issues of the coevolutionary paradigm (Brooks and McLennan, 1991). Lassala and Renesto (2007) were more specific in comparing heterozygosity values between fish groups with different reproductive strategies. These authors have noted that non-migratory fish with no parental care had the highest mean heterozygosity values, in contrast with long-distance migratory and non-migratory species with parental care or internal fecundation strategies.…”

Section: Fish Community Structure and Hydrographic Basinsmentioning

confidence: 99%

Contribution of conservation genetics in assessing neotropical freshwater fish biodiversity

Piorski¹,

Sanches

Costa

et al. 2008

Braz. J. Biol.

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Human activities have a considerable impact on hydrographic systems and fish fauna. The present review on conservation genetics of neotropical freshwater fish reveals that DNA analyses have been promoting increased knowledge on the genetic structure of fish species and their response to environmental changes. This knowledge is fundamental to the management of wild fish populations and the establishment of Evolutionary Significant Units capable of conserving genetic integrity. While population structuring can occur even in long-distance migratory fish, isolated populations can show reduced genetic variation and be at greater risk of extinction. Phylogeography and phylogeny have been powerful tools in understanding the evolution of fish populations, species and communities in distinct neotropic environments. Captive fish can be used to introduce new individuals and genes into the wild and their benefits and disadvantages can be monitored through genetic analysis. Understanding how fish biodiversity in neotropical freshwaters is generated and maintained is highly important, as these habitats are transformed by human development and fish communities are increasingly exploited as food sources to sustain a growing human population.Keywords: molecular genetics, fish population, biology conservation. Contribuição da Genética da Conservação para o conhecimento da biodiversidade dos peixes de água doce neotropicais ResumoAtividades humanas têm um grande impacto sobre os sistemas hidrográficos e a fauna de peixes. A presente revisão em genética da conservação dos peixes de água doce neotropicais revela que as análises de DNA têm promovido um crescimento no conhecimento da estrutura genética das espécies e suas respostas às alterações ambientais. Este conhecimento é fundamental para o manejo das populações de peixes nativos e para o estabelecimento de Unidades Evolutivas Significantes capazes de conservar a integridade genética dessas populações. Enquanto o fenômeno de estruturação de populações pode ocorrer mesmo em peixes migradores de longas distâncias, populações isoladas podem mostrar reduzida variação genética e apresentar grande risco de extinção. Em adição, a filogeografia e a filogenia têm dado importantes contribuições para o entendimento da evolução das populações, espécies e comunidades de peixes em distintos ambientes neotropicais. Populações de cativeiro podem ser utilizadas como fonte de introdução de novos indivíduos e genes no ambiente natural e seus benefícios e desvantagens podem ser monitorados por meio de análises genéticas. É altamente importante, portanto, entender como é gerada e mantida a biodiversidade de peixes de água doce neotropicais, uma vez que os habitats são transformados pelo desenvolvimento humano e as comunidades de peixes têm sido intensamente exploradas como alimento de sustentação desse crescimento das populações humanas.Palavras-chave: genética molecular, populações de peixes, conservação biológica.

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Reproductive strategies and genetic variability in tropical freshwater fish

Cited by 18 publications

References 23 publications

Genetic diversity and population structure of bocachico Prochilodus magdalenae (Pisces, Prochilodontidae) in the Magdalena River basin and its tributaries, Colombia

Genetic diversity and population structure of bocachico Prochilodus magdalenae (Pisces, Prochilodontidae) in the Magdalena River basin and its tributaries, Colombia

Mitochondrial DNA variation of the bocachico Prochilodus magdalenae (Characiformes, Prochilodontidae) in the Magdalena River Basin, Colombia

Contribution of conservation genetics in assessing neotropical freshwater fish biodiversity

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