Tempo and mode of evolution of oryzomyine rodents (Rodentia, Cricetidae, Sigmodontinae): A phylogenomic approach.

The tribe Oryzomyini is an impressive group of rodents, comprising 30 extant genera and an estimated 147 species. Recent remarkable advances in the understanding of the diversity, taxonomy and systematics of the tribe have mostly derived from analyses of single or few genetic markers. However, the evolutionary history and biogeography of Oryzomyini, its origin and diversification across the Neotropics, remain unrevealed. Here we use a multi-locus dataset (over 400 loci) obtained through anchored phylogenomics to provide a genome-wide phylogenetic hypothesis for Oryzomyini and to investigate the tempo and mode of its evolution. Species tree and supermatrix analyses produced topologies with strong support for most branches, with all genera confirmed as monophyletic, a result that previous studies failed to obtain. Our analyses also corroborated the monophyly and phylogenetic relationship of three main clades of Oryzomyini (B, C and D). The origin of the tribe is estimated to be in the Miocene (8.93-5.38 million years ago). The cladogenetic events leading to the four main clades occurred during the late Miocene and early Pliocene and most speciation events in the Pleistocene. Geographic range estimates suggested an east of Andes origin for the ancestor of oryzomyines, most likely in the Boreal Brazilian region, which includes the north bank of Rio Amazonas and the Guiana Shield. Oryzomyini rodents are an autochthonous South America radiation, that colonized areas and dominions of this continent mainly by dispersal events. The evolutionary history of the tribe is deeply associated with the Andean cordillera and the landscape history of Amazon basin.

Mammals of a restinga forest in Mataraca, Paraíba, northeastern Brazil, and its affinities to restinga areas in Brazil / Mamíferos de uma floresta de Restinga em Mataraca, Paraíba, Nordeste do Brasil e suas afinidades com áreas de Restinga no Brasil

Abstract The Restinga forests are plant formations associated to the Atlantic Forest which still have not been much studied in terms of their mastofauna. The objective of the present work was to list for the first time the mammal species found in a Restinga on northeastern Brazil and show the similarities on species composition to other areas of the same environment and of Atlantic Forest. Our records were based on several complementary approaches: field survey, interviews, and museum collections. Subsequently, we performed similarity analysis between Restinga areas along Brazil and Atlantic Forest areas. We found a total of 30 species of mammals distributed in 28 genera, 16 families and 7 orders for Restinga of Mataraca. Species richness was similar to other Restinga areas and similarity analyzes pointed out that Restingas are more closely related to adjacent Atlantic Forest areas than to other Restingas in the country. This suggests that Restingas do not exhibit an autochthone fauna, but rather a faunal subsample of neighbor Atlantic Forest. Therefore, conservations policies for the Restinga habitat depends not only on actions focused on this habitat, but on initiatives that encompass nearby Atlantic Forest remnants, allowing the connectivity between these habitats.

Resumo As restingas são formações vegetais associadas à Floresta Atlântica e ainda pouco exploradas em relação a sua mastofauna. O objetivo desse trabalho foi listar pela primeira vez as espécies de mamíferos presentes em uma restinga no nordeste do Brasil e mostrar sua similaridade com outras áreas do mesmo ambiente e de Mata Atlântica. A listagem foi baseada em diversas abordagens complementares: coletas, entrevistas, material em coleção. Posteriormente realizamos análises de similaridade entre áreas de restinga ao longo do Brasil e áreas de Mata Atlântica. Encontramos um total de 30 espécies de mamíferos distribuídas em 28 gêneros, 16 famílias e sete ordens para restinga de Mataraca. A riqueza ficou próxima a de outras áreas de restinga e as análises de similaridade apontaram que as restingas são mais proximamente relacionadas com as áreas adjacentes de Floresta Atlântica do que com as outras restingas no país. Isso sugere que as Restingas não exibem uma fauna autóctone ou endêmica, mas que sua fauna representa um subconjunto da fauna da Floresta Atlântica mais próxima. Dessa forma, estratégias para a conservação das Restingas não dependem apenas de ações nesse ambiente, mas de iniciativas que atinjam áreas de Mata Atlântica próximas, que garantam a conectividade entre estas.