Kremen Lab Group : “In California, our recent findings show that a diverse community of native bee pollinators can provide sufficient pollination services for crops without the addition of managed colonies of honey bees (Kremen et al. 2002), but that this service critically depends on the availability of natural habitat in proximity to the farm site (Kremen et al. 2004). Farm management (organic versus conventional) may also influence the diversity and abundance of native bees found on farms.”  taken from Current Projects at Dr. Kremen’s (University of California, Berkeley, USA) research website