Can Wild Bees Take Sting From Honeybee Decline?

John Roach
for National Geographic News
October 20, 2004

Decades of disease and overuse of pesticides have put the squeeze on populations of the domesticated honeybee. As a result, farmers are increasingly left with fields of flowering crops that fail to bear fruit.

Since some 15 to 30 percent of the food we humans eat directly or indirectly depend on the pollination services of bees, scientists say the problem threatens to take some excitement—and potentially abundance—from our diets.

Claire Kremen, a conservation biologist at Princeton University in New Jersey, thinks native wild bees can take some of the sting from the honeybee decline. These wild bees buzzed North America for thousands of years before the domesticated European variety arrived.

"We need to ensure we can keep on having [honeybees] around, but at the same time we can reduce the risk of relying on honeybees for crop pollination by protecting wild bees and ensuring their pollination services can be maximized," she said.

Scott Hoffman Black is executive director of the Xerces Society, a Portland, Oregon-based invertebrate-conservation organization. He says North American farmers rely so heavily on domesticated honeybees today that they often forget that pollinated food crops existed before the domesticated honeybee was introduced.

"Prior to the advent of large-scale monoculture agriculture [the practice of growing only one kind of plant in a given plot] in the fifties and the use of lots of chemical pesticides, native bees and feral honeybees pollinated everything. It wasn't an issue. People didn't cart bees all over the country," he said.

Kremen and Black's organization are collaborating to spread the word about the role wild bees play in crop pollination.

While they acknowledge that farmers cannot and will not revert to pre-1950s practices for the sake of wild bees, they advocate steps to conserve and use native wild bee populations as an insurance policy for when a honeybee shortage would otherwise leave fields sapped of their full potential.

Wild Bee Needs

Scientists estimate there are about 4,000 different species of wild bees that are native to North America. They nest in thick grass, soil, and wood; are rarely kept in hives; and generally do not make surplus honey or form large colonies.

While the mites that have proven so devastating to domesticated honeybee populations cause little effect to the wild bees, pesticide use and habitat loss are taking their toll, according to Black.

Continued on Next Page >>




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