Biodiversity and Conservation

, Volume 21, Issue 4, pp 1127–1147 | Cite as

Habitat patch and matrix effects on small-mammal persistence in Amazonian forest fragments

  • Manoel Santos-Filho
  • Carlos A. Peres
  • Dionei J. da Silva
  • Tânia M. Sanaiotti
Original Paper

Abstract

Tropical forest mammal assemblages are widely affected by the twin effects of habitat loss and habitat fragmentation. We evaluated the effects of forest patch metrics, habitat structure, age of patch isolation, and landscape metrics on the species richness, abundance and composition of small mammals at 23 forest fragments (ranging in size from 43 to 7,035 ha) in a highly deforested 3,609-km2 landscape of southwestern Brazilian Amazonia. Using pitfall traps and both terrestrial and arboreal traplines of Sherman, Tomahawk and snap traps, we captured a total of 844 individuals over 34,900 trap-nights representing 26 species and 20 genera of small-mammals, including 13 rodent and 13 marsupial species. We also consider the effects of distance from forest edges on species occupancy and abundance. Overall small mammal abundance, species richness and species composition were primarily affected by the quality of the open-habitat matrix of cattle pastures, rather than by patch metrics such as fragment size. Ultimately, small mammal community structure was determined by a combination of both landscape- and patch-scale variables. Knowledge of the anthropogenic factors that govern small mammal community structure is of critical importance for managing the persistence of forest vertebrates in increasingly fragmented neotropical forest landscapes.

Keywords

Fragmentation Matrix Marsupials Rodents Amazonia Species–area relationship Edge effects 

Notes

Acknowledgments

This study was funded by a Brazilian Ministry of Education (CAPES) doctoral studentship to MSF at the Instituto Nacional de Pesquisas da Amazônia (INPA, Manaus). We would like to thank all landowners for permission to work within their landholdings. William Magnusson, Renato Cintra, Jay Malcolm and an anonymous reviewer provided useful comments on the manuscript. This study was conducted under IBAMA research permits 033/02, 004/03 and 057/04.

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • Manoel Santos-Filho
    • 1
    • 2
  • Carlos A. Peres
    • 3
  • Dionei J. da Silva
    • 1
    • 2
  • Tânia M. Sanaiotti
    • 2
  1. 1.Universidade do Estado de Mato GrossoTangará da SerraBrazil
  2. 2.Instituto Nacional de Pesquisa da Amazônia (INPA)ManausBrazil
  3. 3.School of Environmental SciencesUniversity of East AngliaNorwichUK

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