Sistemática molecular, biogeografia e diversificação de Brucepattersonius (Rodentia: Sigmodontinae)

• Autor(a) principal: Dias, Dayse
• Data de Publicação: 2016
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Espírito Santo (riUfes)
• Texto Completo: http://repositorio.ufes.br/handle/10/3862
• topic: Atlantic Forest; Climatic cycles; Phylogeography; Tropical mountains; Mata atlântica; Filogenia; Filogeografia; Biogeografia; Marcadores biológicos; Akodontini; montanhas tropicais; Zoologia; 57

Brucepattersonius Hershkovitzcomprisesterrestrial and semi-fossorialcricetid rodents,which occupy forests and montanegrasslands in the Atlantic Forest of South America.Thegenuswas recently described(1998) and many aspects of its geographic distribution, phylogenetic relationships, and evolutionaryprocessesare still poorly known. In this study, we aimed to evaluate genetic diversity and the relationshipsof Brucepattersoniusand infer historical processes related to the genusdiversificationbased on phylogenetic hypothesis from afive loci matrix.Four distinct lineages were recovered:threewereassociated to species already named (Brucepattersonius griserufescens, Brucepattersonius soricinus, Brucepattersonius iheringi) and onewasnot attributedto any nominal formand it may represent a new species(Brucepattersoniussp.). Also, Brucepattersoniusigniventrisis apparently ajunior synonym of B. soricinus. Two supraspecific clades were recognized:(B. griserufescens+ Brucepattersoniussp.)distributed along southeastern,and (B. soricinus + B. iheringi),occurring both in southern andsoutheastern portionsof Atlantic Forest Biome.The diversification of this genus occurredmainly during Pliocene-Pleistocene and its evolutionary history appearsto be connectedtotopographic complexity, forest coverdistributionduringPleistocene climatic cycles,and neotectonic activity. Additionally, genetic data revealedidiosyncratic phylogeographic patterns for the species.Brucepattersoniusgriserufecensis relictual on the mountaintop of Caparaó National Park, comprising a small population subject to bottlenecksand founder effects. Brucepattersoniussoricinusand Brucepattersoniussp. showeda weak genetic structure associated to the topographic complexity of mountain areasinsoutheastern Brazil.Brucepattersoniusiheringishowedsignsof recent population expansions insouthern latitudes of the Atlantic Forest. Further investigations on Brucepattersoniusshould focus on the description of the newmolecularlineages and a better morphological diagnosisfor the otherspecies.