Systematics of the genus Oecomys (Sigmodontinae: Oryzomyini): molecular phylogenetic, cytogenetic and morphological approaches reveal cryptic species

Autor(es)

Suarez-Villota, Elkin Y. ^{[1, 2]} ; Carmignotto, Ana Paula ^[3] ; Brandao, Marcus Vinicius ^[3] ; Percequillo, Alexandre Reis ^[4] ; Silva, Maria Jose de J. ^[1]

Afiliação do(s) autor(es)

^[1] Inst Butantan, Lab Ecol & Evolucao, Ave Vital Brazil 1500, BR-05503900 Sao Paulo - Brazil

^[2] Univ Austral Chile, Inst Ciencias Marinas & Limnol, Edificio Emilio Pugin, Campus Isla Teja, Valdivia 5110236 - Chile

^[3] Univ Fed Sao Carlos, Dept Biol, Lab Diversidade Anim, Campus Sorocaba, Rodovia Joao Leme Santos, Km 110, BR-18052780 Sao Paulo - Brazil

^[4] Univ Sao Paulo, Escola Super Agr Luiz de Queiroz, Dept Ciencias Biol, Ave Padua Dias 11, BR-13418900 Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ZOOLOGICAL JOURNAL OF THE LINNEAN SOCIETY; v. 184, n. 1, p. 182-210, SEP 2018.
• Citações Web of Science: 4

Resumo

Oecomys is a genus of Neotropical arboreal rodents composed of 17 species with diploid number ranging from 2n = 54 to 86. Despite this high taxonomic and karyotypic diversity, the species-level systematics remains uncertain. We investigated the phylogenetic relationships and species delimitation of Oecomys using multiple approaches based on cytogenetic, molecular (mtDNA and nuDNA sequences) and morphological data sets. Sampling included 73 individuals from 25 localities in Amazonia, Cerrado, Pantanal and the Atlantic Forest, as well as 128 DNA sequences from GenBank. Molecular species boundaries associated with karyotype, morphological characters and geographic distribution led us to recognize 15 distinct lineages in Oecomys. These include five major well-supported clades composed of O. bicolor, O. catherinae, O. cleberi, O. mamorae, O. paricola and O. roberti, which were hypothesized as species complexes with at least eight putative new taxa. Three new karyotypes are also reported for the genus: 2n = 54 (FN = 54), 2n = 62 (FN = 62) and 2n = 70 (FN = 74). Sympatry of up to four species with different diploid numbers recovered in distinct clades illustrates the complex evolutionary history in Oecomys. These data highlight the importance of combining cytogenetic, morphological and geographic information along with molecular coalescent analyses in developing species delimitation scenarios. (AU)

• Processo FAPESP: 10/03969-4 - Os pequenos mamíferos (Didelphimorphia, Rodentia) do Estado de Mato Grosso, Brasil
• Beneficiário: Marcus Vinicius Brandão de Oliveira
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 05/04557-3 - Estudos citogenéticos e moleculares em pequenos roedores neotropicais
• Beneficiário: Maria José de Jesus Silva
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 11/20022-3 - Sistemática de pequenos mamíferos das formações abertas da América do Sul: o caso do gênero Cryptonanus (Didelphimorphia: Didelphidae)
• Beneficiário: Ana Paula Carmignotto
• Modalidade de apoio: Auxílio à Pesquisa - Regular