The study, published last month in Ecology Letters, states: "Bee abundance and richness were higher in diversified and organic fields and in landscapes comprising more high-quality habitats." It adds that "bee richness on conventional fields with low diversity benefited most from high-quality surrounding land cover".
Senior study author Professor Claire Kremen of the University of California, Berkeley, said: "The way we manage our farms and agricultural landscapes is important for ensuring production of pollinated food crops, which provide about one-third of our calories and far higher proportions of critical micronutrients."
She added: "This result provides strong support for the importance of biologically diversified, organic farming systems in ensuring sustainable food systems."
Kremen also co-authored a study published last month in Science which found that fruit and vegetable production increases when wild pollinators, as opposed to domesticated honeybees, are more abundant.