01941nas a2200181   4500008004100000022001400041245014600055210006900201260001200270300001200282490000800294520132700302100002401629700002101653700002001674700002201694856004301716       2007                        eng d  a0008-347X00aDiversity of cavity-nesting bees (Hymenoptera : Apoidea) within apple orchards and wild habitats in the Annapolis Valley, Nova Scotia, Canada0 aDiversity of cavitynesting bees Hymenoptera Apoidea within apple  cMAR-APR  a235-2490 v1403 aSolitary cavity-nesting bees, especially trap-nesting Megachilidae, have great potential as commercial pollinators. A few species have been developed for crop pollination, but the diversity, abundance, and potential pollination contributions of native cavity-nesting bees within agricultural systems have seldom been assessed. Our objectives were to compare the diversity and fecundity of cavity-nesting bees in Nova Scotia in natural ecosystems with those in apple orchards under three levels of management, using trap nests, and to determine whether any native bees show promise for development as pollinators. Our results show that species richness and numbers of bees reared from trap nests in commercially managed orchards, abandoned orchards, and natural habitats were similar, and species’ compositional patterns were not unique to specific habitats. Trap nests can be used to increase and maintain cavity-nesting bee populations within Nova Scotia apple orchards. Osmia tersula Cockerell (Megachilidae), which accounted for almost 45% of all bees captured and was the most abundant species nesting in all habitats evaluated, should be assessed for potential as a commercial pollinator of spring-flowering crops. The influence of natural cavities on bee species richness in trap-nesting surveys is also discussed.1 aSheffield, Cory, S.1 aKevan, Peter, G.1 aWestby, Sue, M.1 aSmith, Robert, F.  uhttps://apoidea.myspecies.info/node/77