HOME-RANGE SIZE AND TERRITORIALITY IN BOLOMYS-LASIURUS (RODENTIA, MURIDAE) IN AN AMAZONIAN SAVANNA

Bolomys lasiurus is the only species of rodent commonly found in the s avanna of Alter do Chao, central Amazonia. Peak densities during 42 mo nths were less than have been reported from the cerrado biome of centr al Brazil. However, the population at Alter do Chao appears to be more stable than those in other areas and we never recorded zero densities . Many animals were captured over periods greater than 7 months, indic ating that either mortality or dispersal was less than in previous stu dies. Mean home-range size of females was inversely related to the pro portion of females that were gravid or lactating. Female home ranges w ere mutually exclusive and averaged 35% (SD = 8.2%) of male home range s. Male home ranges overlapped extensively. Indices of home-range size varied seasonally and among years.