pesticides pollinator threats wild bees and native bees

Native bees are disappearing across the globe

Last week someone said to me, “Native bees don’t get colony collapse disorder, so it’s hard to believe they’re in trouble too.” Unfortunately, native bees are in trouble—and not just in the United States. Wild and native bees the world over are declining in numbers or disappearing completely.

While it is true that native bees are not experiencing colony collapse disorder, they suffer from many of the same problems that the more “glamorous” animals are experiencing. Chief among these are loss of habitat and habitat fragmentation. And when the habitat is lost, native food sources and nesting environments are lost as well.

Native bees are also subject to the pesticides. All types of pesticides have been found to harm bees, including fungicides, herbicides, acaricides, rodenticides, and of course the ubiquitous insecticides. Since native bees are closely tied to their food source, anything that destroys the food source—whether it’s a herbicide, a freeway, or a housing development—destroys the native insects that were dependent upon it.

A park here, a field there, and a garden down the road are not enough to maintain populations in the long term. Habitat fragmentation destroys the ability of populations to freely intermingle, and soon the genetic pool becomes small and lacks diversity. This is a major step on the road to local extinction. Add enough local extinctions together and a global extinction will follow.

Some entomologists have estimated that about 4000 species of bee are native to North America, but very few of these have been named or described. The view of many conservation biologists is that dozens are going extinct every year—even before we’ve been able to identify them.

Unfortunately—both for bees and for humans—the large “cute” animals have gotten all the conservation attention, and hence all the money. Polar bears, tigers, whales, elephants—things with a big presence—have received the bulk of the funds. Until recently, nobody paid much attention to the bees.

It you’re interested in the processes of evolution and extinction, I recommend a book by David Quammen called “The Song of the Dodo.” Although the book is technical, Quammen writes with a clear and readable style that entertains as well as educates.


Agapostemon "green sweat bee" Flickr photo by jbaker5

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