02640nas a2200265   4500008004100000245006400041210006200105260001200167300001400179490000600193520195900199653001202158653001602170653001702186653001202203653001402215653001802229653001202247653001602259653001502275653001402290653000902304100001702313856004402330       2001                        eng d00aHabitat fragmentation and native bees: a premature verdict?0 aHabitat fragmentation and native bees a premature verdict  c2001///  a149 - 1610 v53 aFew studies directly address the consequences of habitat fragmentation for communities of pollinating insects, particularly for the key pollinator group, bees (Hymenoptera: Apiformes). Bees typically live in habitats where nesting substrates and bloom are patchily distributed and spatially dissociated. Bee studies have all defined habitat fragments as remnant patches of floral hosts or forests, overlooking the nesting needs of bees. Several authors conclude that habitat fragmentation is broadly deleterious, but their own data show that some native species proliferate in sampled fragments. Other studies report greater densities and comparable diversities of native bees at flowers in some fragment size classes relative to undisrupted habitats, but find dramatic shifts in species composition. Insightful studies of habitat fragmentation and bees will consider fragmentation, alteration, and loss of nesting habitats, not just patches of forage plants, as well as the permeability of the surrounding matrix to interpatch movement. Inasmuch as the floral associations and nesting habits of bees are often attributes of species or subgenera, ecological interpretations hinge on authoritative identifications. Study designs must accommodate statistical problems associated with bee community samples, especially non-normal data and frequent zero values. The spatial scale of fragmentation must be appreciated: bees of medium body size can regularly fly 1-2 km from nest site to forage patch. Overall, evidence for prolonged persistence of substantial diversity and abundances of native bee communities in habitat fragments of modest size promises practical solutions for maintaining bee populations. Provided that reserve selection, design, and management can address the foraging and nesting needs of bees, networks of even small reserves may hold hope for sustaining considerable pollinator diversity and the ecological services pollinators provide10aApoidea10aCOMMUNITIES10aCONSERVATION10aDENSITY10aDIVERSITY10aFRAGMENTATION10aHABITAT10aPOLLINATION10aPOLLINATOR10aSELECTION10aSIZE1 aCane, J., H.  uhttps://apoidea.myspecies.info/node/128