Colorado has one of the nation's most diverse bee fauna. An army of volunteers is helping CU scientists track hundreds of front range species.
When a phenomenon called colony collapse disorder began ravaging honey bee populations in the mid-2000s, the world took notice: Flowers, food crops and ecosystems depend on bee pollination.
Of late, mass colony collapse has moderated in the United States, but honey beesā long-term population trend is still sharply downward. And there are thousands of other bee species about which little is known because they get less attention. Colorado alone is home to 946 species, more than all but four other states.
Their circumstances are not assumed to be good, based on existing surveys.
āIn general, bee populations are considered to be in decline everywhere,ā says Virginia Scott, entomology collections manager at the University of Colorado Museum of Natural History in Boulder.
To learn more about Coloradoās abundant solitary wood nesting bees, which make up about 25 percent of all Front Range species ā and to lay a foundation for scientific assessments of population changes ā Scott and colleague Alexandra Rose in 2013 established The Beesā Needs, a research project involving hundreds of volunteer ācitizen scientists.ā
āWe want to understand the āotherā bee mystery,ā says Rose, a bird biologist who is the museumās program manager for citizen science.
Counting bees isnāt easy: Small and spry, they can live throughout a vast area.
āSome are the size of gnats,ā says Rose.
āYouād think they were fruit flies.ā
Also, the Front Range is home to a great diversity of bees, about 650 species, or more than two-thirds of all Colorado species. (Only the desert states of California, Arizona, New Mexico and Utah have more.) Learning something about them all requires a small army.
The Beesā Needsā volunteers ā 528 in 2014, up from 337 a year earlier ā donāt need advanced science training. Mainly, Scott says, they need to be diligent observers and recorders.
āI suppose patience helps, too,ā she says.
A goal of The Beesā Needs is establishing baseline populations for as many species as possible.
These will provide a basis for comparison in the future.
To make data collection convenient, the museum provides volunteers with nesting boxes similar to birdhouses ā stationary attractions where bees (and wasps) take shelter and deposit identifying traces.
The first year of the program, Rose, Scott and friends drilled 10,000 holes of varying sizes into each of 250 wooden boxes.
Volunteers install the boxes in sunny spots (shady ones attract earwigs) and track nests bees build there, noting the plugs mother bees put into the holes to protect their larvae. Different species use different plug materials ā resin, for example, or chewed leaves, grass, mud or silk. Volunteers check the nests every two weeks from April to October, taking pictures and reporting on nest materials.
Adult bees die after the first hard frost. In the spring, offspring chew through the plugs to enter the world outside.
āItās fun, especially as you get others involved,ā says volunteer Sandra Laursen, a researcher in CUās ethnography & evaluation research unit.
Last year Laursen hung her nesting box on the fence of her Boulder condominium complex and found that the boxās āapartmentsā especially appealed to children.
āOne ten-year-old boy quite liked it when he had spotted something I hadnāt,ā she says.
So far, nobodyās been stung (or said so, anyway), according to Rose ā not even by the wasps that also take advantage of the boxes for nesting.
Wasps engender less fondness than bees ā āWe discovered early on that wasp is a four-letter word,ā says Scott ā but they too are important pollinators. Solitary wasps harvest aphids, caterpillars and other garden pests. Rose calls them āthe unsung heroes of the gardening world,ā noting they pollinate flowers along the way: āTalk about organic gardening!ā
Rose soon expects to finish analyzing the citizen scientistsā 2013 data sets. This will yield initial baseline populations for many Colorado bee and wasp species. Data sets collected in the years ahead will help reveal population changes.
āThis is a long-term project,ā Scott says. āThe more cumulative data we can collect, the more weāll understand the mysteries of these solitary insects.ā
To volunteer for the 2015 Beesā Needs project, visitĀ .
Photo courtesy CU Museum of Natural HIstory (bee); Diane Wilson (bees on flowers)