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      Nine-year demography of the black-eared opossum Didelphis aurita (Didelphimorphia: Didelphidae) using life tables Translated title: Demografia do marsupial Didelphis aurita (Didelphimorphia: Didelphidae) durante nove anos utilizando-se tábuas de vida

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          Abstract

          A population of the black-eared opossum, Didelphis aurita Wied-Neuwied 1826, was studied during 1997-2006 by capture-mark-recapture in the Atlantic Forest in the state of Rio de Janeiro. Cohorts were established with females marked still in the pouch, classified into five age classes. Population parameters were estimated using life tables. Survival was type III and mortality was greatest in age classes I and II, just after weaning. Fecundity was inversely correlated with survival, reproductive value was inversely correlated with mortality and residual reproductive value was inversely correlated with fecundity. The intrinsic rate of increase was always close to zero and tended to be slightly negative. The black-eared opossum can be considered a good model species for this type of study.

          Translated abstract

          Uma população de gambás, Didelphis aurita Wied-Neuwied 1826, foi estudada de 1997 a 2006 por captura, marcação e recaptura numa área de Mata Atlântica no Estado do Rio de Janeiro. Foram estabelecidas coortes, incluindo apenas fêmeas marcadas ainda no marsúpio, classificando-as em cinco classes etárias. Os parâmetros populacionais foram calculados através de tábuas de vida horizontais. A maior mortalidade ocorreu entre as classes etárias I e II, logo após o desmame, sendo que a sobrevivência apresentou uma curva do tipo III. A taxa de fecundidade foi inversamente correlacionada com a sobrevida, o valor reprodutivo inversamente correlacionado com a mortalidade e o valor reprodutivo residual inversamente correlacionado com a taxa de fecundidade. A taxa intrínseca de crescimento sempre esteve próxima de zero, porem ligeiramente negativa. O gambá mostrou-se um bom modelo de mamífero para este tipo de estudo.

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          Climatologia do Brasil

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            Ecology: the experimental analysis of distribution and abundance,

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              The evolution of life histories

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                rbzool
                Revista Brasileira de Zoologia
                Rev. Bras. Zool.
                Sociedade Brasileira de Zoologia (Curitiba )
                0101-8175
                June 2008
                : 25
                : 2
                : 206-213
                Affiliations
                [1 ] Universidade Federal do Rio de Janeiro Brazil
                [2 ] Fundação Oswaldo Cruz Brasil
                Article
                S0101-81752008000200007
                10.1590/S0101-81752008000200007
                5abdc8a4-af90-4e50-a0f5-c8bb27eb89e2

                http://creativecommons.org/licenses/by/4.0/

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                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0101-8175&lng=en
                Categories
                ZOOLOGY

                Animal science & Zoology
                Atlantic forest,cohort,intrinsic factors,small mammals,survival,Coorte,fatores intrínsecos,Mata Atlântica,pequenos mamíferos,sobrevivência

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