Conversion of natural habitat to agriculture can profoundly impact pollinator communities with corresponding changes in pollination function. A growing number of studies now document patterns of community change, but we have limited understanding of the mechanism that link changes in the landscape to changes in pollinator communities. We explored the effects of local habitat and landscape composition on bumble bee colony productivity and examined the importance of resource use and availability in the landscape as a mechanism underlying population persistence. We established colonies of Bombus vosnesenskii at 38 sites along a landuse gradient in central
Worker number but not queen production declined significantly with isolation from semi-natural habitat. Connectivity of the landscape proved important. Workers from colonies in all site types collected resources from native plants and crops growing in complementary habitats.