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      Translated title: Terrestrial mammals of the Jequitinhonha River basin, Brazil: a transition area between Atlantic Forest and Cerrado

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          Translated abstract

          Aqui apresentamos uma extensa pesquisa de mamíferos não-voadores ao longo das margens do Rio Jequitinhonha, região biogeográfica interessante que representa uma área de contato entre dois biomas brasileiros (Cerrado e Mata Atlântica), ainda pouco conhecidos para a fauna de mamíferos. Nossos dados foram obtidos após 13 expedições de captura (de 2005 a 2012), em ambas as margens do rio, da nascente até à foz, enriquecida por dados obtidos a partir de amostras de material depositado em seis coleções de mamíferos. Todos os espécimes coletados foram identificados através de seus cariótipos ou morfologia. Foram obtidos dados de 75 localidades (34 na margem direita, 41 à esquerda; 30 no Cerrado e 45 na Floresta Atlântica). Obtivemos registros de 91 espécies de mamíferos não-voadores, ca. de 17% de todos os mamíferos terrestres brasileiros conhecidos. Nossos resultados incluem extensões de distribuição de seis espécies (Monodelphis scalops, Thylamys velutinus, Calomys mattevii, Wiedomys pyrrhorhinos, Galea spixii, Kerodon rupestris), e informações de cariótipo de 26 espécies (11 marsupiais e 15 de roedores), com quatro novos cariótipos. Enquanto a maioria das espécies têm ampla distribuição geográfica, 26 ocorreram apenas no Cerrado e 19 apenas na Mata Atlântica. Foram registradas de 28.7% (6.3% endêmicas) de todas as espécies conhecidas para o Cerrado e 21.5% (22.2% endêmicas) da Floresta Atlântica. A riqueza da fauna registrada nesta região apoia a sua importância da compreensão na diversidade, biogeografia e evolução dos mamíferos.

          Translated abstract

          Here we present an extensive survey for non-volant mammals along the margins of the Jequitinhonha River, which represents a contact area between the Cerrado and Atlantic Forest biomes. Our data were obtained after 13 trapping expeditions (from 2005 to 2012) on both banks of the river, from its source to its mouth, enriched by data obtained from a literature review and voucher specimens deposited in six mammal collections. All collected specimens were identified through their karyotypes and/or morphology. We obtained data for 75 localities (34 at the rigth margin, 42 at the left margin; 30 in the Cerrado and 45 in the Atlantic Forest). We obtained voucher records for 91 species, ca. 17% of all known Brazilian terrestrial non-volant mammals. Our results include range extensions for six species (Monodelphis scalops, Thylamys velutinus, Calomys mattevii, Wiedomys pyrrhorhinos, Galea spixii, Kerodon rupestris), and karyotype information for 26 species (11 marsupials and 15 rodents), with four new karyotypes. While most species have wide geographical range in both biomes, 26 were recorded only in the Cerrado and 19 were recorded only in the Atlantic Forest. Recorded species represent 28.7% (6.3% endemic) of the species known from the Cerrado and 21.5% (22.2% endemic) of those from the Atlantic Forest. The richness of the fauna recorded in this region supports its importance for the understanding of mammal biogeography, diversity and evolution.

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          Ten New Genera of Oryzomyine Rodents (Cricetidae: Sigmodontinae)

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            Neotropical forest expansion during the last glacial period challenges refuge hypothesis.

            The forest refuge hypothesis (FRH) has long been a paradigm for explaining the extreme biological diversity of tropical forests. According to this hypothesis, forest retraction and fragmentation during glacial periods would have promoted reproductive isolation and consequently speciation in forest patches (ecological refuges) surrounded by open habitats. The recent use of paleoclimatic models of species and habitat distributions revitalized the FRH, not by considering refuges as the main drivers of allopatric speciation, but instead by suggesting that high contemporary diversity is associated with historically stable forest areas. However, the role of the emerged continental shelf on the Atlantic Forest biodiversity hotspot of eastern South America during glacial periods has been ignored in the literature. Here, we combined results of species distribution models with coalescent simulations based on DNA sequences to explore the congruence between scenarios of forest dynamics through time and the genetic structure of mammal species cooccurring in the central region of the Atlantic Forest. Contrary to the FRH predictions, we found more fragmentation of suitable habitats during the last interglacial (LIG) and the present than in the last glacial maximum (LGM), probably due to topography. We also detected expansion of suitable climatic conditions onto the emerged continental shelf during the LGM, which would have allowed forests and forest-adapted species to expand. The interplay of sea level and land distribution must have been crucial in the biogeographic history of the Atlantic Forest, and forest refuges played only a minor role, if any, in this biodiversity hotspot during glacial periods.
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              Manual Técnico da Vegetação Brasileira

              (2012)
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                mznt
                Mastozoología neotropical
                Mastozool. neotrop.
                Sociedad Argentina para el Estudio de los Mamíferos (SAREM) (Mendoza, Mendoza, Argentina )
                0327-9383
                1666-0536
                June 2017
                : 24
                : 1
                : 95-119
                Affiliations
                [05] Seropédica RJ orgnameUniversidade Federal do Rio de Janeiro orgdiv1Departamento de Biologia Animal orgdiv2Laboratório de Diversidade de Morcegos Brazil
                [03] Diamantina MG orgnameUniversidade Federal dos Vales do Jequitinhonha e Mucuri orgdiv1Departamento de Ciências Biológicas orgdiv2Laboratório de Ecologia Brazil
                [02] Recife PE orgnameUniversidade Federal de Pernambuco orgdiv1CB orgdiv2Departamento de Zoologia Brazil
                [04] Rio de Janeiro RJ orgnameUniversidade do Estado do Rio de Janeiro orgdiv1FGEL orgdiv2Departamento de Geologia Aplicada Brazil
                [01] Rio de Janeiro RJ orgnameUniversidade do Estado do Rio de Janeiro orgdiv1IB orgdiv2Departamento de Zoologia Brazil
                Article
                S0327-93832017000100009
                2883fd7a-00a8-4f78-a798-8cc0283005b0

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 23 March 2016
                : 23 February 2017
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 70, Pages: 25
                Product

                SciELO Argentina


                Barreiras,Cariótipos,Didelphimorphia,Riqueza de espécies,Rodentia,Barriers,Karyotypes,Species richness

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