Chromosomes and phylogeography of Sylvilagus (Mammalia, Leporidae) from eastern Brazil

Abstract

A large geographic differentiation has been reported in Sylvilagus brasiliensis based on external characters of a small number of specimens. A new karyotype with 2n = 40 and FNa = 74 from Rio de Janeiro is herein reported. Phylogenetic analyses based on cytochrome b DNA of eight samples from the states of Paraíba, Tocantins, Goiás, Minas Gerais and Rio de Janeiro suggested a strongly structured population. Altogether, molecular and karyotypic data suggested that the diversity of Sylvilagus in eastern Brazil may be larger than the one reported in the literature on the basis of external characters.

Medium- And Large-Sized Mammals at the Urucum Massif in the Brazilian Pantanal: Camera Trap as an Effective Sampling Method to Estimate Species Richness, Relative Abundance, and Activity Patterns

“…The highest species richness were found in Carnivora, Rodentia, and Artiodactyla, following a pattern also observed in similar studies carried out in the Pantanal and Cerrado (Trolle 2003, Porfirio et al 2014, Estrela et al 2015. In turn, the lowest species richness occurred in Lagomorpha and Perissodactyla, a pattern that is expected since only one species of these orders occur within the area (Bonvicino et al 2015, Abreu Oecol. Aust.…”

Areas of endemism: to overlap or not to overlap, that is the question

“…The CA 11 has no genus or cladogram in common with four of the eight overlapping CAs. With the other four CAs it shares endemic taxa in the genus Sylvilagus (an American genus with 17 species): S. audubonii (CA 11) has its counterparts ( S. cunicularis (CA 6), although this species is absent in the phylogenies of Sylvilagus ); S. brasiliensis (CA 23) which is four nodes distant according to the analysis where the species was described (Bonvicino et al., ); and S. nuttalli (CA 35) which is the sister group of S. audubonii according to several studies (Halanych and Robinson, ; Matthee et al., ; Robinson and Matthee, ). Another genus in common is Reithrodontomys , an American genus with 20 species: R. montanus (CA 11) is 11 nodes from R. mexicanus (CA 23), four nodes from R. sumichrasti (CA 23) and four nodes from R. fulvescens (CA 40), following Fabre et al.…”

Untitled

“…Deixaram claro que estes dois táxons são provavelmente distintos. Ruedas e Smith (2018) usaram a denominação de S. brasiliensis sensu lato para estes táxons e outras prováveis novas espécies no Tocantins (Bonvicino et al, 2015) e no Pará . No entanto, Silva et al (2019), baseados em dados moleculares, usaram S. minensis para amostras dos estados de Minas Gerais, Bahia, São Paulo, Mato Grosso, corroborando e ampliando a estruturação genética encontrada por Bonvicino et al (2015), usando, ainda, S. paraguensis para uma amostra do Rio Grande do Sul, no Parque Estadual do Turvo (Figura 2).…”