Examinando por Autor "Bruno, María Cecilia"
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Acceso Abierto First record and supplementary description of Leporinus amae Godoy, 1980 (Characiformes: Anostomidae) from freshwaters in Argentina(2013) Almirón, Adriana E.; Casciotta, Jorge Rafael; Bruno, María Cecilia; Piálek, Lubomír; Doubnerová, Klára; Říčan, OldřichLeporinus amae is known from the Rio Apuaê (type locality), Rio Canoas and Rio Caveiras tributaries of the Uruguay River basin, in Brazil. The original description of this species was mainly based on a single specimen lacking intraspecific variation in meristic and morphometric of most characters. We expand the range of distribution and report the first occurrence of Leporinus amae in Misiones Province, Argentina. Additionally, we provide a supplementary description of the species. - Artículo
Acceso Abierto Phylogeographic pattern of Jenynsia multidentata (Cyprinodontiformes: Anablepidae) in the southern boundary of the Brazilian Subregion, Argentina(Sociedade Brasileira de Ictiologia, 2013) Bruno, María Cecilia; Casciotta, Jorge Rafael; Almirón, Adriana E.; Lizarralde, Marta SusanaThe Atlantic drainage basins are located in the southern Pampean area, in the southernmost part of the Brazilian subregion. Tectonic and paleoclimatic phenomena, occurring during the Quaternary, have currently isolated these basins from the present hydrographic system. Their ichthyofaunal composition is similar to that of hydric systems located further northward. Jenynsia multidentata is a species with wide distribution in the Atlantic drainage basins, as well as in those Northern basins. Here we investigated the phylogeographic pattern of Jenynsia multidentata and analyzed its relationships with the paleoclimatic and geologic history of the region. The analysis of the population’s assemblage showed moderate genetic diversity, demographic equilibrium and marked genetic structure in the populations that occupy the extremes of the distributional range. The populations in the center of the range did not present genetic diversity, sharing a single haplotype. These results allow inferring that the presence of Jenynsia multidentata in the area results from historical demographic processes that are independent but complementary. In turn, these processes could arise from paleoclimatic changes occurred during the Quaternary. - Artículo
Acceso Abierto Quaternary refugia and secondary contact in the southern boundary of the Brazilian subregion: comparative phylogeography of freshwater fish(Senckenberg Gesellschaft für Naturforschung, 2015) Bruno, María Cecilia; Casciotta, Jorge Rafael; Almirón, Adriana E.; Riccillo, Fernando; Lizarralde, MartaFreshwater fish are an ideal model to illustrate how climate-tectonic changes affect the distribution of genetic variation. Freshwater bodies are extensively affected by environmental changes, with streams even changing their courses in the most extreme cases. Fortunately, this situation is reflected in the genetic composition of populations and may currently be inferred from the study of mitochondrial DNA molecular markers. Here we analyze and compare the phylogeographic patterns of the species Corydoras paleatus and Jenynsia multidentata at the southern limit of the Brazilian subregion. These basins are isolated in the current hydrogeographic pattern due to geologic and paleoclimatic changes. Our results support a concurrent pattern for both species. Some lineages have persisted in the area under adverse climate conditions, possibly in environmental refuges, while other lineages may have colonized the area later by means of paleodrainage connections. In addition, the presence of independent, greatly diverging lineages, even within the same watercourses, suggests secondary contact between these lineages. This work represents a first approach to understand how geologic and paleoclimatic changes have affected the distribution of genetic variation in the Southern Pampean Area.