Distributions and phylogeographic data of rheophilic freshwater fishes provide evidences on the geographic extension of a central-brazilian amazonian palaeoplateau in the area of the present day Pantanal Wetland

• Published in: Neotropical Ichthyology Vol. 11; no. 2; pp. 319 - 326
• Main Authors: Ribeiro, Alexandre C., Jacob, Rodrigo M., Silva, Ronnayana R. S. R., Lima, Flávio C. T., Ferreira, Daniela C., Ferreira, Katiane M., Mariguela, Tatiane C., Pereira, Luiz H. G., Oliveira, Claudio
• Format: Journal Article
• Language: English
• Published: Sociedade Brasileira de Ictiologia 01.06.2013
• Subjects: Brazil; Brazilian highlands; Centromochlus; Cochliodon; Freshwater; Historical biogeography; Hypostomus; Hypostomus cochliodon; Jubiaba acanthogaster; Knodus chapadae; Leporinus; Leporinus octomaculatus; Moenkhausia; Moenkhausia cosmops; Oligosarcus; Oligosarcus perdido; Paleodrainage; Pisces; Tectonic evolution; Brazil
• ISSN: 1679-6225; 1982-0224; 1679-6225; 1982-0224
• DOI: 10.1590/S1679-62252013000200010

The analysis of the distribution patterns presented by examples of freshwater fishes restricted to headwater habitat: the anostomid Leporinus octomaculatus, the characins Jubiaba acanthogaster, Oligosarcus perdido, Moenkhausia cosmops, Knodus chapadae, Planaltina sp., the loricariid Hypostomus cochliodon, and the auchenipterid Centromochlus sp. provided evidences of a relatively recent shared history between the highlands of the upper rio Paraguay and adjoining upland drainage basins. Restricted to headwater of the uplands in the upper rio Paraguay and adjoining basins, these species provide biological evidence of the former extension of the central Brazilian plateau before the origin of the Pantanal Wetland. Disjunction took place due to an ecological barrier to these rheophilic taxa represented tectonic subsidence related to the origin of the Pantanal Wetland. Molecular analysis of Jubiaba acanthogaster revealed that the sample from the upper rio Xingu basin are the sister-group of a clade that includes samples from the upper rio Arinos (upper rio Tapajos) plus the upper rio Paraguay basin, supporting the assumption that the origin of the upper rio Paraguay basin causing vicariance between this basin and the upper rio Tapajos is the least vicariant event in the evolutionary history of the group.Original Abstract: A analise do padrao de distribuicao apresentado por exemplos de peixes de agua doce neotropicais restritos a habitats reofilicos de cabeceira: o anostomideo Leporinus octomaculatus, os caracideos Jubiaba acanthogaster, Oligosarcus perdido, Moenkhausia cosmops, Knodus chapadae, Planaltina sp., o loricariideo Hypostomus cochliodon e o auquenipterideo Centromochlus sp. fornecem evidencias de uma historia compartilhada relativamente recente entre as terras altas do alto rio Paraguai e bacias de terras altas vizinhas. Restritas as cabeceiras das areas altas nas bacias do alto rio Paraguai e bacias vizinhas, estas especies fornecem evidencias biologicas da preterita extensao do Planalto Central Brasileiro anteriormente a origem tectonica da planicie alagavel do Pantanal. Disjuncoes ocorreram devido a barreira ecologica para estes taxons reofilicos representada pela subsidencia tectonica associada a origem do Pantanal. A analise molecular de Jupiaba acanthogaster revelou que amostras da bacia do alto rio Xingu consistem no grupo-irmao de um clado mais inclusivo que inclui amostras do alto rio Arinos (alto rio Tapajos) mais o alto rio Paraguai, suportando a suposicao de que a origem do alto rio Paraguai causou vicariancia entre esta bacia e o alto rio Tapajos no ultimo evento vicariante na historia evolutiva do grupo.