[url]http://www.cnn.com/2002/TECH/science/06/14/coolsc.coffee/index.html[/url]
[img]http://i.cnn.net/cnn/2002/TECH/science/06/14/coolsc.coffee/story.beans2.jpg[/img]
[b]Buzz from scientists: Bees improve flavor, crop yields[/b]
(CNN) -- If you're grateful each morning for the tasty, eye-opening buzz you get from your coffee, then you might have a "killer" bee to thank.
Coffee plants (coffea arabica) are capable of self-pollination, so for a long time researchers did not think insects made much difference to the crop.
But studies now show that when Africanized bees (or killer bees) pollinate coffee plants, yields can increase by more than 50 percent.
David Roubik of the Smithsonian Tropical Research Institute in Panama details the value of bees to the coffee harvest in this week's edition of the journal, Nature.
"When an insect, like the Africanized bee does the pollen transportation, there's a mixing of genes, a widening of the gene pool," said Roubik. "That gives every plant a greater potential to reproduce, and creates beans that are bigger and better tasting."
African honeybees, often dubbed killer bees, were introduced to southern Brazil in 1956 in an effort to create a better honeybee. The bees prospered and soon colonized all of the tropical Americas.
Their venom is not more toxic than common honeybees, but Africanized bees do hunt down intruders to their territory in large numbers and for long distances. A few dozen humans have been killed since their introduction in the Americas in the mid-1950s. However, it usually takes hundreds of stings to kill a person or large animal.
By 1997, these bees had become major pollinators in Panama. And while they often get a bad rap for their aggressive behavior, farmers and beekeepers are beginning to realize the advantages of the insects, not only to the coffee crop, but to thousands of other species of flowering plants, said Roubik.
There is something of a natural control group available to compare coffee harvests in Central America to similar crops that are not pollinated by the Africanized bees.
In the Caribbean, big coffee producers Cuba, Puerto Rico, Haiti, Jamaica and the Dominican Republic have virtually no killer bees, and their coffee yields are only about half that of Central America and Mexico
[b]Bigger harvest[/b]
Coffee yields in some places, including Kenya and Indonesia, have fallen during the past half century, perhaps, says Roubik, because more intense farming has taken away habitat for potential pollinators.