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Saving our bees
Date:8/3/2008

hose to inform us about natural populations and how they deliver pollinator services to crops?" he asks.

Rachael Winfree of Rutgers University is particularly interested in the health of native bees as "biological insurance" against the decline of honeybees. "Over half of the world's native plants require animal pollinators, and most of those are bees," she says. "Native pollinators are serving as a backup plan for the honeybee."

Winfree will present a study that combines data from over 50 published studies of bee population sizes and diversity. She found that in areas of extreme fragmentation due to human development, animal grazing, logging and crop fields, bee populations were smaller and the number of bee species was lower than in natural or minimally disturbed areas.

Scientists are also using technological methods to further understand bee communities. Daniel Chalk, a graduate student at the University of Exeter in the United Kingdom, used an artificial intelligence computer model to predict flight patterns of wild bumblebees. His model is useful because it can predict how bees would forage, or look for food resources, in different landscapes.

"Crucially, our model is able to predict the behavior of bees in larger-scale foraging environments, where the foraging patches can be thought of as large fields of crops," says Chalk. His model, he says, could help scientists understand how land disturbance caused by humans affects bee species richness and density.

Williams used an experimental approach to understand the landscape-scale ecology of native bumblebees. He and his colleagues established 38 bee colonies across central California, ranging from undisturbed chaparral to organic and conventional farms. During the course of the summer months, they found that the further a colony was from natural areas, the fewer worker bees it sustained. Williams' team also found that bees always collected pollen from both crops an
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Contact: Christine Buckley
christine@esa.org
202-833-8773
Ecological Society of America
Source:Eurekalert

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