摘要：The present study describes the distribution of Zygodontomys brevicauda (Rodentia, Sigmodontinae)
relating the presence/absence of the species to a digital database on the vegetation of savannas of the
northeastern State of Roraima , Brazil. The study area is situated in the Surumu River region, between 03º58’-
04º27’N and 60º13’-61º16’W, and is composed mainly of savanna formations. In a total effort of 9479 trap
days, the trap success for Z. brevicauda was 0.57%. The probability of capture of the species was calculated for
each trap station through logistic regression, using structural characteristics of each habitat. The association
of capture probabilities with different habitat classes using a LANDSAT-TM satellite image allowed a spatial
view of the potential distribution of the species considering the habitat mosaic of the region. The species is at
least partially dependent on the savanna-forest boundary. The models show a high frequency of apparently
unsuitable areas, especially of open and closed savannas, which might suggest that habitat occupancy is far
from saturated. Zygodontomys brevicauda appears to be a colonizing species, and was shown to be associated
particularly with the edges of the gallery forests. This habitat type may act as source habitats for open savannas.
Loading...
