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

Detalhes bibliográficos
Ano de defesa: 2016
Autor(a) principal: Dias, Dayse
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal do Espírito Santo
BR
Mestrado em Biologia Animal
UFES
Programa de Pós-Graduação em Ciências Biológicas
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
57
Link de acesso: http://repositorio.ufes.br/handle/10/3862
Resumo: 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.