Chromosomal evidence of downstream dispersal of Astyanax fasciatus (Characiformes, Characidae) associated with river shed interconnection

Autor(es)

Moreira Peres, Wellington Adriano ^[1] ; Buckup, Paulo Andreas ^[2] ; Zanella Kantek, Daniel Luis ^[3] ; Carlos Bertollo, Luiz Antonio ^[4] ; Moreira-Filho, Orlando ^[4]

Afiliação do(s) autor(es)

^[1] IBAMA, Inst Brasileiro Meio Ambiente & Recursos Nat Reno, BR-78640000 Canarana, MT - Brazil

^[2] Univ Fed Rio de Janeiro, Museu Nacl, Dept Vertebrados, BR-20940040 Rio De Janeiro - Brazil

^[3] ICMBio, Estacao Ecol Taiama, Inst Chico Mendes Conservacao Biodiversidade, Caceres, MT - Brazil

^[4] Univ Fed Sao Carlos, Dept Genet & Evolucao, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Genetica; v. 137, n. 3, p. 305-311, DEC 2009.
• Citações Web of Science: 13

Resumo

In the 1960s, as a part of the construction of the Furnas Hydroelectric Power Dam, Minas Gerais, Brazil, the Rio Piumhi was diverted from the Rio Grande drainage to the So Francisco River basin, with the resulting introduction of species from one basin to the other. Chromosomal characteristics of various populations of Astyanax fasciatus sensu Eigenmann from the transect region were studied using cytogenetic techniques, with the goal to identify and map the dispersal of invasive species in the Rio So Francisco. Populations of the Rio Grande and Rio Piumhi are distinct from those of the So Francisco basin based on chromosome markers associated to the heterochromatin, Ag-NORs, 18S rDNA, 5S rDNA, and As-51 satellite DNA sites. Individuals with karyomorph originally present in the Piumhi drainage are now present in the So Francisco basin, downstream from the transposition channel. This expansion of the distribution corroborates a hypothesis of progressive substitution of native populations by the invasive Piumhi form. (AU)

• Processo FAPESP: 05/58630-3 - Analise citogenetica de especies de characidae envolvidas na transposicao do rio piumhi para a bacia do rio sao francisco.
• Beneficiário: Wellington Adriano Moreira Peres
• Modalidade de apoio: Bolsas no Brasil - Doutorado