Abstract
ABSTRACT Pimelodus yuma (formerly Pimelodus blochii) is a freshwater fish, endemic to the Colombian Magdalena-Cauca and Caribbean basins that experiences habitat disturbances resulting from anthropogenic activities. Due to the lack of information about the population genetics of this species, this study developed 14 species-specific microsatellite loci to assess the genetic diversity and population structure of samples from the lower section of the Cauca River. The studied species showed genetic diversity levels higher than the average values reported for Neotropical Siluriformes and significant inbreeding levels as was described for some congeners. Furthermore, P. yuma comprises two coexisting genetic groups that exhibit gene flow along the lower section of the Cauca River. This information constitutes a baseline for future monitoring of the genetic diversity and population structure in an anthropic influenced sector of the Magdalena-Cauca basin.
Highlights
IntroductionPimelodus yuma Villa-Navarro & Acero, 2017 is one of the 36 valid species of the genus Pimelodus Lacepède, 1803 (Fricke et al, 2020) distributed in Cauca, Magdalena and Sinú River drainages in Colombia (Villa-Navarro et al, 2017)
Migratory patterns may influence the gene flow or genetic structure in the natural populations of fishes of the family Pimelodidae
These loci exhibited values of average number alleles per locus (13.071) and expected heterozygosities (0.849) lower than those reported in the congener P. grosskopfii (Restrepo-Escobar, Márquez, 2020), but higher than those reported in P. microstoma Steindachner, 1877 (Savada et al, 2020) and were similar to those reported in P. maculatus (Paiva, Kalapothakis, 2008)
Summary
Pimelodus yuma Villa-Navarro & Acero, 2017 is one of the 36 valid species of the genus Pimelodus Lacepède, 1803 (Fricke et al, 2020) distributed in Cauca, Magdalena and Sinú River drainages in Colombia (Villa-Navarro et al, 2017). This species and their congener Pimelodus crypticus Villa-Navarro & Cala, 2017 were both considered as Pimelodus blochii Valenciennes, 1840 before 2017 (Villa-Navarro et al, 2017). There are no reports of any risk category for P. yuma in the Colombian red list of threatened freshwater fishes (Mojica et al, 2012) or in the red list of threatened species of the International Union for ni.bio.br | scielo.br/ni
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