Abstract
The Neotropical freshwater fish Ichthyoelephas longirostris (Characiformes: prochilodontidae) is a short-distance migratory species endemic to Colombia. This study developed for the first time a set of 24 polymorphic microsatellite loci by using next-generation sequencing to explore the population genetics of this commercially exploited species. Nineteen of these loci were used to assess the genetic diversity and structure of 193 I. longirostris in three Colombian rivers of the Magdalena basin. Results showed that a single genetic stock circulates in the Cauca River, whereas other single different genetic stock is present in the rivers Samaná Norte and San Bartolomé-Magdalena. Additionally, I. longirostris was genetically different among and across rivers. This first insight about the population genetic structure of I. longirostris is crucial for monitoring the genetic diversity, the management and conservation of its populations, and complement the genetic studies in Prochilodontidae.
Highlights
Ichthyoelephas longirostris (Steindachner, 1879) is a Colombian endemic fish of importance in the commercial and subsistence fisheries
This study developed a set of 24 microsatellite loci for population genetic studies of the Colombian endemic fish I. longirostris
These loci are polymorphic, highly informative and 19 of them exhibited abilities to detect reliable levels of genetic diversity and structure in three Colombian rivers. These microsatellite loci are suitable for future studies of diversity and population genetics of I. longirostris
Summary
Ichthyoelephas longirostris (Steindachner, 1879) is a Colombian endemic fish of importance in the commercial and subsistence fisheries. In the Colombian red list of threatened freshwater fishes, I. longirostris is considered an endangered species based on some criteria that include scarce biological and ecological information, restricted distribution (tributaries of Magdalena and Ranchería basins), infrequent catches, disappearance in some floodplain lakes and rivers (Ranchería) and the habitat degradation by anthropogenic activities (Mojica et al, 2012). This detritivourous species prefers turbulent and clear waters (RománValencia, 1993) and has a short-distance migration range The population genetics of I. longirostris remain unknown, this information is necessary to develop management and conservation policies for this species
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