Volunteers count bees on sunflowers in study

San Francisco State University biologist Gretchen LeBuhn wants you to grow a sunflower - not just any old sunflower, but the North American native species Helianthus annuus - and monitor the bee traffic once it blooms. It's called the Great Sunflower Project, and with it LeBuhn hopes to connect the ecosystem services of bees with issues of food security.

LeBuhn started out as a botanist but became fascinated with bees. When teaching a bee-identification course at the Southwest Research Center in Arizona, she realized how little most people know about this diverse (1,500 species exist in California, 500 in the Bay Area) and ecologically vital group.

Honeybees are declining

"There's very good data that honeybees seem to be declining, and spotty data that native bees aren't doing well," she said. Several researchers, including Gordon Frankie at UC Berkeley, have been studying urban bee communities. But no one had attempted a continentwide survey of the state of the bees.

LeBuhn, who provides the seeds, wants Great Sunflower Project participants to use a specific kind of sunflower so their observations can be standardized. H. annuus is "a classic bee plant." Its long blooming season - potentially May to September - should attract a broad range of native bees that fly at different times of the year.

"Sunflowers are easy to grow, easy to watch bees on, and bees love them," she added. Schools, including San Francisco's Willie Brown Academy, and community gardens will have their own patches.

Bee watchers will be asked to spend half an hour - early in the day, before the pollen is depleted - on two Saturdays each month taking note of what kinds of bees visit their sunflowers and how long it takes for the first five to arrive. The identification part has been field-tested.

"We're comfortable that people can identify bumblebees," LeBuhn said, "and honeybees possibly." Other possibilities are large, solitary, shiny black carpenter bees and green "metallic" bees. Reporting "just bees" is fine, though. The time the bees spend at the sunflowers indicates how much pollination service the flower is getting.

That's where the food-security connection comes in.

"Worldwide, community gardens provide up to 15 to 20 percent of food," explains LeBuhn. "For the urban poor in some countries, 60 to 80 percent of their food is what they raise. It's often the only material contribution women can make to the household economy. I'm interested in whether community gardens are getting enough pollinator services in urban settings."

Although it may not be the norm in the Bay Area, she said, community gardens in other countries can have high pesticide use - and beneficial insects like bees are not immune to pesticides. If funding is available, she'd like to take the Great Sunflower Project