Journal of Tropical Ecology



Scale-dependent habitat selection in three didelphid marsupials using the spool-and-line technique in the Atlantic forest of Brazil


Maíra C. Moura a1a3c1, Alice C. Caparelli a2, Simone R. Freitas a1 and Marcus V. Vieira a1
a1 Laboratório de Vertebrados, Departamento de Ecologia, Universidade Federal do Rio de Janeiro, CP 68020, Rio de Janeiro, RJ, 21941-590, Brazil
a2 Museu Nacional, Quinta da Boa Vista, São Cristóvão, Rio de Janeiro, RJ, 20940-040, Brazil
a3 Pós-Graduação em Ecologia, Universidade Federal do Rio de Janeiro, CP 68020, Rio de Janeiro, RJ, 21941-590, Brazil

Article author query
moura mc   [PubMed][Google Scholar] 
caparelli ac   [PubMed][Google Scholar] 
freitas sr   [PubMed][Google Scholar] 
vieira mv   [PubMed][Google Scholar] 

Abstract

Habitat selection can be detected at different scales. For small mammals, habitat studies normally evaluate micro- or meso-habitat selection, but rarely are multiple scales analysed simultaneously. These studies use quantitative data of structural characteristics around the trap stations to evaluate selection. We test an alternative method to evaluate habitat selection in three didelphid marsupials (Didelphis aurita, Philander frenatus and Metachirus nudicaudatus), using a spool-and-line device, and measure habitat selection at two spatial scales. Habitat was characterized by seven habitat variables measured at ten points of direction change along the path traversed by each individual, and at 25 trap stations distributed in a 1-ha area. Micro-habitat selection was estimated at each point by comparing habitat measures between the direction selected against other directions. Meso-habitat selection was estimated by comparing habitat measurements on the whole path of an individual against habitat measures on the 25 trap stations. Patterns of selection for each species could only be detected at the meso-habitat scale, although a few individuals in each species were selective at the micro-habitat scale. Studies of habitat selection need to address the scale of study quantitatively, if possible comparing two or more scales to determine the scale of selection.

(Accepted October 12 2004)


Key Words: Didelphis aurita; Metachirus nudicaudatus; Philander frenatus; scales.

Correspondence:
c1 Corresponding author. Email: mairamoura@hotmail.com or mvvieira@biologia.ufrj.br