Eva Rueda

• PhD
• Researcher at National University of the Littoral

Introduction Megaleporinus obtusidens, also known as "boga," is a freshwater teleost fish species widely distributed across South America with significant commercial value in Argentina and Brazil. Fishers, particularly those in the lower Paraná River, frequently classify the fish they catch as M. obtusidens. Despite various approaches, including cy...

Phylogeographic research is able to identify previously unrecognized units of biodiversity. The aeglid Aegla scamosa is a species that inhabits the Desaguadero basin waterbodies in southern South America. Crabs of the family Aeglidae are especially sensitive to changes in their environment since they have restricted distributions. The aims of our s...

Surubim (Pseudoplatystoma corruscans, Pimelodidae) are migratory catfish native to the rivers in the La Plata and São Francisco basins. They are piscivores that attain considerable body sizes and are a valuable economic resource. Surubim exhibits extensive migrations during its life cycle that may affect the population structure at vast geographic...

Population genetics studies the distributions and changes in population allele frequencies in response to processes, such as mutation, natural selection, gene flow, and genetic drift. Researchers daily manage genetic, biological, and environmental data of the samples, storing them in text files or spreadsheets, which makes it difficult to maintain...

Ceratium furcoides is an invasive freshwater dinoflagellate that in the last three decades has expanded its geographic distribution in South America, being recently found in Paraná River floodplain (Argentina). Despite growing concern about the presence and impacts of this invader, information regarding genetic diversity in the southern hemisphere...

Geographical isolation is a key element in allopatric speciation. If gene flow is interrupted for long enough by geographical barriers, populations can evolve independently and eventually form distinct species. Aegla singularis provides an ideal model to study this process due to the characteristics of the geographical area that it occupies and its...

Geographical isolation is a key element in allopatric speciation. If gene flow is interrupted for long enough by geographical barriers, populations can evolve independently and eventually form distinct species. Aegla singularis provides an ideal model to study this process due to the characteristics of the geographical area that it occupies and its...

Las modificaciones antrópicas de los ecosistemas acuáticos favorecen la proliferación de microorganismos invasores que pueden ocasionar alteraciones en la biodiversidad y el funcionamiento ecosistémico. Las especies del dinoflagelado del género Ceratium provenientes del hemisferio norte comenzaron a dispersarse en la década del 90 en América del Su...

Acipenser gueldenstaedtii is recorded for the first time from Argentina, from lotic and lentic environments of the lower Paraná and La Plata rivers in the provinces of Santa Fe and Buenos Aires. The species has previously been mentioned as introduced to the Negro river in Uruguay. Probably all known specimens were accidentally released from aquicul...

Four valid species are currently recognized in the Neotropical migratory genus Salminus : Salminus brasiliensis , Salminus franciscanus , Salminus hilarii and Salminus affinis . However, molecular evidence strongly suggested that two different species might be contained under the taxonomic denomination Salminus brasiliensis . Therefore, the geograp...

El sábalo es una especie de gran importancia ecológica y económica que se distribuye en ríos de la Cuenca del Plata, la segunda en importancia en Sudamérica. Es un eslabón crucial en los ecosistemas paranoplatenses ya que es sostén de su cadena trófica. Presenta alta fecundidad, alta longevidad (hasta 25 años) y comportamiento migratorio de alta mo...

The Patagonian silverside Odontesthes hatcheri is a native fish restricted to streams and lakes of Patagonia (Argentina and Chile). Stocking programs to enhance recreational fisheries in man-made reservoirs have introduced a nonnative, closely-related species (the pejerrey O. bonariensis) in Patagonia almost a century ago, and yet little is known a...

The yacare caiman (Caiman yacare) is a reptile from South America and one of the two crocodilian species present in Argentina. The degradation of their natural habitat and strong hunting pressure led to a sharp numerical decline of wild populations. Nowadays C. yacare is included in the Appendix II of CITES, and at the same time it has been subject...

Microsatellites are genomic sequences comprised of tandem repeats of short nucleotide motifs widely used as molecular markers in population genetics. FullSSR is a new bioinformatic tool for microsatellite (SSR) loci detection and primer design using genomic data from NGS assay. The software was tested with 2000 sequences of Oryza sativa shotgun seq...

Wild populations of Caiman latirostris are subject to sustainable use programs in Argentina, becoming a species with important impact in the regional economy, based in their skin and meat. Genetic studies are fundamental to acquire information on important parameters for conservation and management, which may be obtained from analysis of molecular...

Aeglidae is the only freshwater family in the infraorder Anomura. Aegla uruguayana Schmitt, 1942 is one of themost widely distributed species in southern South America and is found in different environments, which makes it an interesting object for population genetic studies. The main objective of this work was to analyse the genetic population str...

Prochilodus lineatus is a highly migratory fish species that sustains the most important commercial fishery of Paraná-Paraguay basin. Migratory patterns are poorly known and only few population genetic studies are available for this species in the Upper Paraná. To assess genetic population structure, we genotyped a sample of 93 individuals from the...

Sometimes, commercial products obtained from wild animals are sold as if they were from domestic animals and vice versa. At this point of the productive chain, legal control of possible wildlife products is difficult. Common in the commerce of northern Argentina, skins of two wild species, the carpincho and the collared peccary, look very similar t...

The knowledge about reproductive strategies of a species contributes to their conservation. Multiple paternity is a reproductive behavior increasing effective population size, which could increase genetic diversity particularly in populations submitted to bottlenecks events. In Argentina, wild populations of Caiman latirostris are subject of a mana...

Eight polymorphic microsatellite loci were isolated and characterized for the migratory freshwater fish Salminus brasiliensis (Characiformes) and tested on 67 individuals from nine geographically distant locations along the Paraná Basin. The number of alleles per locus ranged from four to 14, with observed heterozygosity estimates ranging from 0·15...

Thirteen new polymorphic microsatellite loci were developed and tested in 57 individuals from three locations along the Paraná River. All loci were polymorphic, with 2–22 alleles per locus. Cross-species amplifications were successful for all loci in four other Prochilodus species, suggesting that these microsatellites will be useful for investigat...

Genetic population analysis using molecular markers is probably the most important issue in conservation genetics and today it is a very useful tool for the study of species subjected to sustainable use. Caiman latirostris (broad-snouted caiman) is one of the two crocodilian species cited for Argentina. Their wild populations were drastically reduc...

Homeodomain-leucine zipper proteins constitute a family of transcription factors found only in plants. Expression patterns of the sunflower homeobox-leucine zipper gene Hahb-10 (Helianthus annuus homeobox-10), that belongs to the HD-Zip II subfamily, were analysed. Northern blots showed that Hahb-10 is expressed primarily in mature leaves, although...