SciELO - Scientific Electronic Library Online

vol.45 issue4OsHV-1 and notifiable protozoa in healthy Crassostrea corteziensis cultured in two distant areas of the Gulf of CaliforniaCatalase, superoxide dismutase, glutathione peroxidase and oxygen radical absorbance capacity in the gut of juvenile pacu Piaractus mesopotamicus and dourado Salminus brasiliensis fed bovine first milk secretion author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links

  • On index processCited by Google
  • Have no similar articlesSimilars in SciELO
  • On index processSimilars in Google


Latin american journal of aquatic research

On-line version ISSN 0718-560X


VALENCIA, Evelyn; VELIZ, David; TOMBARI, Andrea  and  VEGA-RETTER, Caren. Genetic population structure and evidence of genetic homogeneity in populations of the Argentinian silverside Odontesthes bonariensis (Teleostei: Atherinopsidae) inhabiting central and northwestern Argentina. Lat. Am. J. Aquat. Res. [online]. 2017, vol.45, n.4, pp.708-716. ISSN 0718-560X.

The study of species in their native geographic ranges is key to understanding how human activity has influenced spatial fragmentation or species homogenization. The Argentinian silverside Odontesthes bonariensis, of interest for aquiculture and sport fishing, is a relevant subject of study. The species has been introduced in a number of countries and re-introduced in some areas of Argentina with unknown effects. The objectives of this study were to determine the population structure, genetic diversity (GD) and effective population sizes (Ne) of O. bonariensis in Argentina. Six microsatellite loci were amplified in individuals collected from four water bodies affected by commercial and sport fishing: Cabra Corral Reservoir (CC), Chascomús Lake (CH), Chasicó Lake (LCH) and the Río de la Plata (RLP). Three genetic groups were detected: one in CC, one in RLP and the last inhabiting CH and LCH. Interestingly, CH and LCH are located 768 km apart, but showed no difference in allele frequencies; suggesting the introduction of individuals from CH into LCH. The largest allele richness, GD and Ne were found in RLP indicating that the largest population of O. bonariensis may be found in this area. Current Ne were lower than historical Ne in all areas, suggesting a change in the GD over time. This study provides information on the genetic structure and genetic diversity of O. bonariensis across its native distribution and over time, demonstrating the first evidence of a possible genetic homogenization in this species probably linked to human activities.

Keywords : genetic population structure; genetic homogenization; microsatellite; human impact.

        · text in English     · English ( pdf )