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POPULATION ECOLOGY OF SMALL RODENTS AND MARSUPIALS IN A SEMI-DECIDUOUS TROPICAL FOREST OF THE SOUTHEAST PANTANAL, BRAZIL
Sazonalidade
Dinâmica populacional
Pantanal Matogrossense
Roedores
Oecomys mamorae
population dynamics
seasonality
small mammal
Thrichomys pachyurus
Author
Affilliation
Fundação Oswaldo Cruz. Campus Fiocruz da Mata Atlântica. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biologia de Tripanosomatídeos. Rio de Janeiro, RJ, Brasil. / EMBRAPA. Centro de Pesquisa Agropecuária do Pantanal. Corumbá, MS, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biologia de Tripanosomatídeos. Rio de Janeiro, RJ, Brasil. / EMBRAPA. Centro de Pesquisa Agropecuária do Pantanal. Corumbá, MS, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios. Rio de Janeiro, RJ, Brasil.
Abstract
The Pantanal is a South American biome characterized by extensive plains and stark environmental seasonality.
Several habitats are subject to annual flooding, forcing small mammal species to aggregate in dry forest patches,
which most likely influences their population dynamics and life history strategies. In order to investigate the seasonal
influence on the life history traits of these small mammals, we conducted a 2-year mark-recapture study in the southeastern
region of the Brazilian Pantanal (Nhecolândia) and analyzed the population dynamics of the most abundant
small mammal species with the jackknife estimator. A trapping effort of 21,560 trap-nights resulted in 615 individuals in
1,171 captures (success = 5.43%). Three species of rodents – Oecomys mamorae (Thomas, 1906), Thrichomys pachyurus
(Wagner, 1845), and Clyomys laticeps (Thomas, 1841) – and three species of marsupials – Gracilinanus agilis (Burmeister,
1854), Thylamys macrurus (Olfers, 1818), and Monodelphis domestica (Wagner, 1842) – were obtained. The most abundant
species was O. mamorae, followed by G. agilis and T. pachyurus. Oecomys mamorae was more abundant in the wet
season and presented an opportunistic reproductive strategy. Gracilianus agilis displayed increased population sizes in
the dry season and synchronized, seasonal reproduction during the rainy season. Thrichomys pachyurus had a small
population size, delayed response to variations in environmental conditions and higher reproductive rates in the dry
season. All species revealed different life history strategies (seasonal, opportunistic or delayed response to environmental
variations), coinciding with periods of higher resource availability in order to maximize survival.
Keywords in Portuguese
Pequenos mamíferosSazonalidade
Dinâmica populacional
Pantanal Matogrossense
Roedores
Keywords
Gracilinanus agilisOecomys mamorae
population dynamics
seasonality
small mammal
Thrichomys pachyurus
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