Monday, 2 April 2012

Something to Worry About, Something to Celebrate

Most of us have heard about the catastrophic decline in bee populations in developed countries.  It's been called "colony collapse disorder". Apparently healthy hives die-off as worker bees start to disappear, and with no food, the hives weaken and die.  In the Maritimes there have been huge losses in over-wintering hives. Given the importance of bees to pollination of so many of the plants and trees we require to produce food, scientists around the world have been working on what's happening. It includes a bewildering array of possibilities from viruses, mites, fungi and other pathogens, to stress and poor diet from the great spring migration of beehives that travel thousands of miles  throughout North America pollinating one crop after another. And of course pesticides has been on everyone's list.

Last week two important studies were published that focus on a group of pesticides called neonicotinoids that are widely used by farmers and pet owners in the Maritimes. Imidacloprid (sold under the brand names Admire, Gaucho, Merit, and Advantage-that's the flea product used on dogs and cats) has received a lot of attention especially on PEI because of its wide use in the potato industry.  Almost all potato growers apply imidacloprid as a liquid in the furrow when planting.  The upside of the product is that it's a systemic which resides in the plant itself killing Colorado potato beetles for months without the farmer having to do any further insecticide spraying.  Its persistence, the ability to control sucking insects for months, is also its biggest danger.

No one disputes (it's right on the label of the product) that imidacloprid kills bees. The years of research, including here at UPEI,  have focused instead  on whether bees are exposed to the pesticide because of its use in potatoes. Here's the thinking. Potatoes do have a flower but it really doesn't offer much to bees, so you never see bees working potato fields they way they do clover or canola fields. In a normal rotation grain is grown next and again it's of no interest to bees. So it's really in the third year of a proper rotation when hay is produced (including clover and alfalfa) when there are plants of interest to bees.  The UPEI research showed imidacloprid is not a risk to bees two years after its use in a potato crop.

The new research raises serious questions about imidacloprid's use again.  It indicates that  sub-lethal exposure (small amounts) to  neonicotinoids can be just as deadly, because it alters the behavior of bees.  This won't come as a surprise to many beekeepers on PEI who have argued for years that the wide use of imidacloprid had to be hurting their hives, despite what the research showed.

This was one of the more difficult stories I covered over the years. I have friends who are beekeepers who made a compelling case that imidacloprid should be banned and I had an obligation working for the people's network to expose the truth. Other people I respected said the lose of hives was linked to mites, climate change, and poor management. The UPEI research was well designed and seemed to give  a good indication  that imidacloprid was not the culprit.  This new research means it's time to think about this again. I'll include a story about the new research below.

The better news is that organic farmer Raymond Loo is going to produce pastured beef and pork.  I've written a lot about the importance of PEI moving in this direction. Grass is something we can produce here really well, and higher-priced grass-fed beef does have a niche market following. It could give PEI a marketing edge, but someone has to do it to find if that's the case. And Raymond once more is taking the risk. We should support him.

Here's the bee stuff:

2 Studies Point to Common Pesticide as a Culprit in Declining Bee Colonies
by CARL ZIMMER  •  March 29, 2012

Scientists have been alarmed and puzzled by declines in bee populations in the United States and other parts of the world. They have suspected that pesticides are playing a part, but to date their experiments have yielded conflicting, ambiguous results.

In Thursday’s issue of the journal Science, two teams of researchers published studies suggesting that low levels of a common pesticide can have significant effects on bee colonies. One experiment, conducted by French researchers, indicates that the chemicals fog honeybee brains, making it harder for them to find their way home. The other study, by scientists in Britain, suggests that they keep bumblebees from supplying their hives with enough food to produce new queens.

The authors of both studies contend that their results raise serious questions about the use of the pesticides, known as neonicotinoids.

“I personally would like to see them not being used until more research has been done,” said David Goulson, an author of the bumblebee paper who teaches at the University of Stirling, in Scotland. “If it confirms what we’ve found, then they certainly shouldn’t be used when they’re going to be fed on by bees.”

But pesticides are only one of several likely factors that scientists have linked to declining bee populations. There are simply fewer flowers, for example, thanks to land development. Bees are increasingly succumbing to mites, viruses, fungi and other pathogens.

Outside experts were divided about the importance of the two new studies. Some favored the honeybee study over the bumblebee study, while others felt the opposite was true. Environmentalists say that both studies support their view that the insecticides should be banned. And a scientist for Bayer CropScience, the leading maker of neonicotinoids, cast doubt on both studies, for what other scientists said were legitimate reasons.

David Fischer, an ecotoxicologist at Bayer CropScience, said the new experiments had design flaws and conflicting results. In the French study, he said, the honeybees got far too much neonicotinoid. “I think they selected an improper dose level,” Dr. Fischer said.

Dr. Goulson’s study on bumblebees might warrant a “closer look,” Dr. Fischer said, but he argued that the weight of evidence still points to mites and viruses as the most likely candidates for bee declines.

The research does not solve the mystery of the vanishing bees. Although bumblebees have been on the decline in the United States and elsewhere, they have not succumbed to a specific phenomenon known as colony collapse disorder, which affects only honeybees.

Yet the research is coming out at a time when opposition to neonicotinoids is gaining momentum. The insecticides, introduced in the early 1990s, have exploded in popularity; virtually all corn grown in the United States is treated with them. Neonicotinoids are taken up by plants and moved to all their tissues — including the nectar on which bees feed. The concentration of neonicotinoids in nectar is not lethal, but some scientists have wondered if it might still affect bees.

In the honeybee experiment, researchers at the National Institute for Agricultural Research in France fed the bees a dose of neonicotinoid-laced sugar water and then moved them more than half a mile from their hive. The bees carried miniature radio tags that allowed the scientists to keep track of how many returned to the hive.

In familiar territory, the scientists found, the bees exposed to the pesticide were 10 percent less likely than healthy bees to make it home. In unfamiliar places, that figure rose to 31 percent.

The French scientists used a computer model to estimate how the hive would be affected by the loss of these bees. Under different conditions, they concluded that the hive’s population might drop by two-thirds or more, depending on how many worker bees were exposed.

“I thought it was very well designed,” said May Berenbaum, an entomologist at the University of Illinois at Urbana-Champaign.

But James Cresswell, an ecotoxicologist at the University of Exeter in England, was less impressed, because the scientists had to rely on a computer model to determine changes in the hive. “I don’t think the paper is a trump card,” he said.

In the British study, Dr. Goulson and his colleagues fed sugar water laced with a neonicotinoid pesticide to 50 bumblebee colonies. The researchers then moved the bee colonies to a farm, alongside 25 colonies that had been fed ordinary sugar water.

At the end of each year, all the bumblebees in a hive die except for a few new queens, which will go on to found new hives. Dr. Goulson and his colleagues found that colonies exposed to neonicotinoids produced 85 percent fewer queens. This reduction would translate into 85 percent fewer hives.

Jeffery Pettis, a bee expert at the United States Department of Agriculture, called Dr. Goulson’s study “alarming.” He said he suspected that other types of wild bees would be shown to suffer similar effects.

Dr. Pettis is also convinced that neonicotinoids in low doses make bees more vulnerable to disease. He and other researchers have recently published experiments showing that neonicotinoids make honeybees more vulnerable to infections from parasitic fungi.

“Three or four years ago, I was much more cautious about how much pesticides were contributing to the problem,” Dr. Pettis said. “Now more and more evidence points to pesticides being a consistent part of the problem.”

No comments:

Post a Comment