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Push for pollinators: Local efforts to restore bee populations

  • 5 min to read

On a hot day in late July, a group of researchers sat in a grassy section of Carver Park Reserve in Victoria, counting and classifying types of bumble bees they plucked off wildflowers. All of a sudden, they got excited. 

The group, a team of Three Rivers Park District naturalists led by wildlife biologist Angela Grill and aided by University of Minnesota Bee Lab researcher and doctorate student Julia Brokaw, found something rare: a rusty patched bumble bee. 

“That’s super cool to get a rusty patched,” Brokaw grinned.  

The rusty patched was once common in the eastern United States, but has seen a 90 percent population loss in the past two decades, according to the U.S. Fish and Wildlife Service. 

In many ways, the rusty patched bumble bee is emblematic of all pollinator species in Minnesota and throughout the country that have suffered massive population loss in the past 20 years due to habitat loss, pesticide use, climate change, disease and other factors.

Bee

A bumblebee finds a bee balm plant at Murphy-Hanrehan Park Reserve in Savage. Three Rivers Parks puts out about 200 pounds of wildflower seeds every year to help pollinators.

The public has become aware of the plight of bees and other pollinators in recent years, prompting the federal government to announce a National Strategy to Promote the Health of Honey Bees and Other Pollinators in 2015.

In 2016, Gov. Mark Dayton signed an executive order creating a team of state employees dedicated to restoring healthy pollinator levels in Minnesota and the Interagency Pollinator Protection Team was born. The team consists of staffers from all state agencies, the Minnesota Board of Water and Soil Resources, the Minnesota Pollution Control Agency and the Minnesota Zoo.

Organizing the interagency effort is the task of state pollinator coordinator Faith Krogstad of the DNR. She said the interagency group is needed because pollinators impact the lives of all Minnesotans. 

"Pollinators are vital to ecosystem health and to our food system," Krogstad said. 

In December, they published their first annual summary: the 2017 Minnesota State Agency Pollinator Report. 

The report outlines the trouble pollinators are facing in Minnesota. For example, the monarch butterfly has seen an 80 percent population loss since the mid-1990s, largely attributable to an estimated 81 percent decline in milkweed plants in the agricultural landscape between 1999 and 2010, according to the report. 

It also established three goals for the state: one, ensure lands throughout Minnesota support healthy, diverse and abundant pollinator populations; two, get Minnesotans to use pesticides judiciously and only when necessary; and three, engage Minnesotans in understanding, supporting and valuing pollinator populations. 

State departments have all been asked to do what they can to improve pollinator conditions. While the DNR focuses on planting diverse wildflower seeds throughout state forests, parks and trails, MnDOT is planting wildflower seed mixes on roadsides to grow pollinator habitat, the Minnesota Pollution Control Agency is working on turning the state's 109 closed landfills into pollinator friendly habitats, and other state agencies are planting pollinator gardens outside their facilities.

"There's a lot of collaboration on this," Krogstad said. 

MnDOT is also one of the state transportation agencies participating in the Monarch Highway, an initiative launched by the National Wildlife Federation to plant pollinator friendly vegetation along Interstate 35 from Minnesota through Texas along the butterfly's migratory path.  

ESTABLISHING BASELINE

Another goal for the state is learning more about how Minnesota pollinators are doing, which is why surveys like the one Grill and Brokaw worked on at Carver Park Reserve are important.

To conduct a bumble bee survey, Grill and a team of naturalists from Three Rivers Parks go through flower patches and prairie areas where the bees are feeding and snag them off the flowers into small plastic containers.

Bee

Two bumblebees feed at Murphy-Hanrehan Park Reserve in Savage. Three Rivers Parks puts out about 200 pounds of wildflower seeds every year to help pollinators.

The captured bees are sorted by the plant they were found feeding on, then identified by the naturalists and Brokaw. There are at least 400 species of bees in Minnesota, including 20 species of bumble bees, 14 of which can be found in Three Rivers Parks. Telling them apart takes an expert eye and some help from a guide sheet. 

Once the bumble bee is identified, the researchers note what species was found, what plant it was feeding on, and its gender. The captured bees are then transferred to a bee net and dotted with a marker so as not to be recorded twice. 

In about an hour and a half, the group had recorded 84 bumble bees, with the common eastern bumble bee being the most prominent. 

Bee Survey 2

Three Rivers Park District Wildlife Biologist Angel Grill, left, shows her team of naturalists a rusty patched bumblebee that was found during a bee survey at Carver Park Reserve in Victoria in late July. The rusty patched bumblebee is federally endangered but is found in Three Rivers Parks and throughout the metro.

Grill has been conducting these surveys throughout the summer, documenting 100 bees at each, and has now found the rusty patched bumble bee at three parks.

“I think it’s been really eye-opening,” Grill said of the surveys.

In many ways, the surveys are establishing a baseline of how bee populations are doing. At the U of M Bee Lab, and at universities across the nation, researchers are trying to figure out how to establish surveys on a broader level. Brokaw’s adviser, Dr. Dan Cariveau, attended a conference of bee researchers to discuss that strategy in West Virginia this year.

Without a baseline, researchers can't track the effectiveness of conservation efforts or determine the extent of bee declines. 

“It’s something a lot of people are working on,” Brokaw said.

One challenge in studying bees and measuring their populations is locating the nests. Unlike European honey bees or wasps, most native bee species are solitary, with one female to one small nest, but some bunch or nest close to one another in semi-social groups, Brokaw said. 

To find the nests Grill is working with tiny radios and telemetry. They plant a miniature radio on a captured bee, and follow its signals to the nest. 

That's partially why Three Rivers Park District has worked with the U of M Bee Lab to set up “bee blocks," or wooden boards with 1/4-inch holes bored into them where native bee species can nest in the parks. The bee blocks, or hotels, are great for the bees and make it easier for researchers to observe nesting populations. 

PITCHING IN

Actions from local governments, businesses and homeowners can help pollinators, experts say.

Krogstad recommends four techniques to help pollinators at the individual gardner level: first, plant a diverse array of flowering plants, mostly native species; second, try to plant flowers that will bloom throughout the year, not all at once; third, provide nesting sites in your yard; and fourth, use pesticides sparingly and judiciously.

For bees, not all plants are equal, Brokaw said. Some plants draw lots of bees, others draw lots of types of bees. Different plants have different nutrition breakdowns. Some have more nectar or pollen than others, some are rich in protein. 

Bee survey 4

Captured bumblebees wait to be identified during a bee survey at Carver Park Reserve in Waconia.

Some bee species nest in the ground, so keeping small bare sections of yard might help them. People can also make their own bee blocks, but should clean out the lining tubes where the bee’s nest once a year, Brokaw said.

Kelly Lorenz, general manager of The Mustard Seed Landscaping and Garden Center in Chanhassen, said there has been an increased interest in people buying bee blocks in recent years, but not exactly a spike. 

That move mirrors the way customers have been approaching pollinator friendly landscaping in general, Lorenz said. There's more interest and purchasing of native flowers and other pollinator friendly perennials, but it comes from a select audience. 

"People in general are more concerned and interested in bee friendly plants and habitats," Lorenz said. 

The increased interest in pollinator gardens has come in the last six years, she said, and in general is higher among younger homeowners and families. More people have asked about using less chemical pesticides in those years, too. 

Krogstad said throughout the metro and state they are seeing results from people planting native shrubs and wildflowers in their gardens. For example, the rusty patched bumblebee is now more common in the metro area than in more rural habitats, Krogstad said.

"It's a wonderful thing when the solution to your problem is planting flowers," Krogstad said. 

Three Rivers Parks District Senior Wildlife Manager John Moriarty said the park district, which oversees 27,000 acres of trails throughout the west metro, has been making an effort to support pollinators for several years. They disperse about 200 pounds of wildflower seed each year throughout the parks.

“We’re constantly adding wildflowers to our parks and have been for 20 years,” he said.

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