Effects of reproductive resource supplementation on space-use patterns in Dendrobates pumilio.

I increased the availability of tadpole-rearing sites (bromeliads) and oviposition sites (leaf litter) and examined the effects on space-use patterns in adult Dendrobates pumilio at the La Selva Biological Reserve in northeastern Costa Rica. I made 4158 observations of 986 marked adults during the seven-month study period. The addition of leaf litter did not result in increased density, but the addition of bromeliads did. The addition of leaf litter resulted in increased home-range size, but the effect depended on bromelial addition and sex. Home-range size was greater for females than males, and may be related to parental care and/or mate selection. Home-range size was not correlated with density. Spatio-temporal overlap was not affected by resource supplementation but the proportion of females captured in sites shared with males varied temporally. Dispersion was no affected by bromeliad supplementation but males on litter-addition plots were less clumped than males on other plots. These results indicate that the density increase observed on bromeliad-addition plots was accommodated by frogs utilizing previously unoccupied space. Frogs were captured more frequently at bromeliads on bromeliad-supplemented plots than on litter-addition and control plots. The size of the area defended by territorial males is smaller than home-range size indicating the absence of home-range defense.