return to warmwell.com


The alarming decline in bees


In total the value of Europe's insect pollinators is estimated at €14.2 billion. In some regions where fields are large and there are few hedgerows (in which queens forage in spring and build their nests) crop yields are already falling.
We need to; More from Sussex Wildlife Trust factsheet (pdf)

March 27th 2015 ~ "I don’t suppose I’m on DEFRA’s Christmas list," says bee expert

January 10th 2014 ~ Just how bad is the bee deficiency in Europe?

April 2013 ~Three Bee-harming pesticides banned in Europe

March 14th 2011 ~ UN takes very seriously the decline in bees

January 2011 ~ "The abundance of four common species of bumblebee in the US has dropped by 96% in just the past few decades, according to the most comprehensive national census of the insects. "

October 8th 2010 ~ "Both the virus and the fungus proliferate in cool, damp weather, and both do their dirty work in the bee gut.."

October 7th 2010 ~ Well done DEFRA for taking seriously the need to help increasing numbers of new beekeepers

January 8th 2010 ~Loss of forage - not pesticides - responsible, says newly published summary of evidence

Jan 2010 A round-up of latest science thinking on honey bee colony collapse from University of Sussex bee lab

January 2010 ~ Recent good news is that the illegal registration of the pesticide spirotetramat has been successfully challenged in the US.

January 2010 ~ Girolami has found concentrations of insecticide in clouds above seeding machines 1,000 times the dose lethal to bees

Oct 30 2009 ~ Will Syngenta funded research have sufficiently wide terms of reference?

Oct 12 2009 ~ neonicotinoids are now the most widely used group of insecticides in the United States, despite concerns voiced by the Natural Resources Defense Council.

Sept 30 2009 ~ "Vanishing of the Bees" will be released in Britain next month

Sept 16 2009 ~ "To help reverse the worrying decline in the UK bee population..."

August 25 2009 ~ ribosome damage caused by picorna-like viruses may leave bees especially vulnerable

July 20 2009 ~ " it would be far better if they allowed us to treat our bees as we used to do. "

July 10 2009 ~ Soil Association is calling on the Government to protect honeybees and ban neonicotinoid pesticides.

July 6 2009 ~ Honeybee parliamentary group to hold its first meeting amid fears that £10m funding will fail to stop the insect's decline

Although the UK government blamed poor weather and the parasitic varroa mite for the honeybee's demise, he added that this has not been conclusively proven.

Thursday May 21 2009 - "The problem with the bees is the monoculture situation": Michael Pollan

May 18 2009 ~ Have others noticed the arrival of the black bee?

May 2 2009 ~ "any suggestion that GM crops and pesticides may be causing the decline of honeybees is met with heated denial from the proponents."

May 1 2009 ~ BEE DECLINE "... there is also a concern about the possible effect of pesticides on bees."

March 10 2009 ~ Jane Kennedy says,"Bees are just about the most hard working of insects"

March 6 2009 ~ Hansard - Bees: Research

March 4 2009 ~ The feral honey bee population is reported to have been largely wiped out by disease in the last 15 years.

March 1 2009 ~ Petition request

.

November 14 2008 ~ The risk to bees from neonicotinoid pesticides - the level of risk is "acceptable" ??

November 5 2008 ~ While France initiates measures to protect bees, DEFRA says it cannot afford to increase research

October 3 2008 ~ Neonicotinoids killing bees

September 10 2008 ~ Bee keepers are opening their hives and finding them virtually empty

June 25 2008 ~ "Defra must be stung into action over missing bees"

June 19 2008 ~ 30% fewer bees "varroa and foul brood akin to foot and mouth disease in bees..the Government must wake up...."

June 2 2008 ~ "Pollination, largely by honey bees, contributes £165 million a year to the agricultural economy." Last winter one in five colonies perished.. but there is no commitment to funding

May 22 2008 ~ mass death of bees in southern Germany blamed on insecticide


A round-up of latest science thinking on honey bee colony collapse from University of Sussex bee lab

Date    26 January 2010
 

Concerted effort needed to save the honey bee

Perhaps the most accurate thing about Albert Einstein's pronouncement on the importance of bees - "if the bee disappeared off the surface of the globe, then man would have only four years of life left." -  is that he never said it.

It's an aphorism often quoted in the many media reports on honey bee losses, along with apocalyptic headlines warning of economic and ecological disaster if the honey bee disappears for good.

The honey bee is both a native British insect and a vital part of our agriculture and food chain. It is certainly true that honey bee colonies are dying across the world - and their complete demise would have devastating consequences for all flowering plants and the production of food (honey bees pollinate many food crops). There is a worrying downward trend in hive numbers in Britain, down from one million a century ago to 250,000 today, with similar declines in the USA. In addition, there have been many reports of large numbers of hives dying in various parts of the world. But as yet there is no agreement on a definitive cause of this phenomenon.

What does scientific research really make of these recent losses of honey bee colonies?

Professor of Apiculture Francis Ratnieks and his team at the University of Sussex Laboratory of Apiculture and Social Insects (LASI) are currently working on the Sussex Plan - a five-year programme of bee biology research, applied research into honey bee breeding and disease management and outreach to beekeepers, schools and local communities. The aim is to help the honey bee: research has already begun into breeding more hygienic bees and determining where bees forage.

Here, Professor Ratnieks and research colleague Norman Carreck, a leading authority on apiculture and bee science, provide an overview of the latest thinking, and stress the need for a "joined-up" strategy to save the honey bee from further decline.

Honey bees are being killed off by something called Colony Collapse Disorder, aren't they?

It's not helpful to describe all honey bee decline as "Colony Collapse Disorder". The term CCD was coined to describe a specific set of symptoms in USA bee hives. Commercially reared honey bees are responsible for pollinating huge numbers of crops in the USA, where the California almond crop, pollinated by one million bee colonies specially shipped in for the job, is worth £2 billion alone. To this day, no one knows what the cause of CCD is, although a combination of pathogens is the most likely cause.

So CCD is just a part of the problem?

Yes. The challenge is that there seems to be no unifying cause to colony collapse globally, but interaction between multiple factors, such as weather patterns, availability of forage (the flowers bees need for nectar and pollen), quality of forage, pesticides, pests and diseases. More research needs to be done into all of these contributing factors - far more than is being undertaken currently.

Pesticides are a likely cause of bee death, surely - in trying to poison the "bad" pests that eat our crops, we also kill helpful insects such as bees?

A group of pesticides called neonicatinoids have been blamed for extensive colony collapse. These chemicals were banned in France, but colony losses have continued there. So it is unlikely that these chemicals themselves are causing colony collapse. Rather than killing bees outright, however, pesticides might be working against honey bees in subtler ways, by making them more susceptible to disease. Herbicides don't directly kill honey bees, but they are part of modern intensive agriculture which has resulted in reduced numbers of flowers in the countryside. Bees get their food - pollen and nectar - from flowers.

A lot of attention has been given to various possible causes, ranging from mobile phone microwaves and the development of GM crops, but none of these suggestions offers a credible explanation for honey bee colony losses.

Could we be looking at a new disease, then?

It's unlikely that we are looking for a micro-organism not already known to scientists. In December comprehensive surveys of honey bee losses were carried out in 16 countries in North America and Europe. A definitive explanation for these losses is still elusive, but the belief is that the interaction between existing pests and pathogens are still the most important cause of colony collapse.

A mite called Varroa destructor, a parasite originally confined to the Asian honey bee Apis cerana, has now colonised "our" honey bee, Apis mellifera, and is now found on Apis mellifera in all continents except Australia. Varroa destructor can transmit a variety of honey bee viruses.
The incidence and abundance of viral infections in the honey bee has increased substantially since this mite colonised the honey bee, but it cannot alone account for all colony collapse. A recent study showed that viruses can spread from bee to bee, without the need for the mite to be present, and indeed cirus epidemics occurred before Varroa mites were present on Apis mellifera.

A 2007 study carried out in the USA showed that Israeli acute paralysis virus was the pathogen most commonly associated with CCD, but a 2009 study from the USA that investigated 60 factors that might be associated with colony losses gave a much less clear picture. Just how important this this and other viruses are in causing CCD will need further research.

Are there any other suspects?

Another pathogen is a gut parasite, Nosema ceranae, which has recently been found in bee hives around the world. Like Varroa destructor, Nosema ceranae originated in the Asian bee, Apis cerana, and seems to be replacing the type of Nosema, N. apis, normally found in our species of honey bee, Apis mellifera. However, there is good evidence that Nosema ceranae colonised the USA honey bee before CCD took hold. Once again, more research is needed to determine how virulent Nosema ceranae really is. Researchers in Spain are convinced it is causing colony deaths in their country, but it seems not to be causing a problem in several other countries where it has been monitored.

So we're none the wiser then?

Actually we are. We now know that we are dealing with a complex puzzle, and that there is no single or novel cause, and that the situation is not the same in every country. The first annual report of the U.S. Colony Collapse Disorder Steering Committee in July 2009 supports this idea. Conventional causes of bee death, in complex and varied combinations, could be to blame
- for example, the interaction between known pests and pathogens (complex and widespread), poor weather conditions that impact on foraging, lack of forage and management factors such as use of pesticides and long-distance transport of hives to nectar sources or pollination locations.

Many scientists across the world are now investigating the possible causes of honey bee death. Comprehensive collaboration would help to fit the pieces of this complicated jigsaw together. There also needs to be closer collaboration between science and beekeeping. The formation of COLOSS, an EU-funded network which coordinates all national bee research activity across Europe, and now globally, aims to explain and prevent massive honey bee colony losses. So far it has 160 members drawn from 40 countries worldwide. COLOSS will seek to promote consistent research approaches and a transnational research programme that will be of benefit to science and beekeeping practice.

Good hive management remains a key weapon in the fight against colony collapse. Beekeeping is becoming increasingly technical (pollen substitutes are now given to bees, for example, in place of the real thing foraged from flowers), which may have unintended consequences for bee health. Further research is needed in this area, too, to ensure that colonies are kept healthy.

For example, at the University of Sussex we have started a project to breed hygienic bees that are more effective at removing diseased brood from the hive, thereby helping beekeepers to maintain hives free of debilitating pests and disease. Another project is examining where honey bees collect nectar and pollen so that we can better understand how bee-friendly the modern landscape is. These two projects will provide information and resources that can help beekeepers keep their colonies healthy, and help improve the food supply for bees and other pollinating insects. Food supply is vital: even if we could somehow control all honey bee diseases, the bees still have to find food (flowers).

So we could be on the verge of solving the riddle of this modern threat to our long relationship with the honey bee?

The problem facing honey bees can be thought of as a wake-up call to action and to take the need for pollination more seriously. There are reports from hundreds of years ago of large numbers of honey bee colonies dying, and it is unlikely that there will ever be an end to the need for research and action to safeguard thriving populations of honey bees and beekeeping in the UK and other countries.

Notes for Editors

For a more detailed appraisal of honey bee research into colony collapse,
see:
 
http://www.sciencemag.org/cgi/content/short/327/5962/152 
 
The recent article by Professor Ratnieks and Norman Carreck published in Science - Clarity on Honey Bee Collapse?

And
 
 http://www.ibra.org.uk/articles/specialissue2010
The Journal of Apicultural Research Special Issue: International Studies on Honey Bee Colony Losses, edited by Dr Peter Neumann (Chair of the COLOSS network and Norman Carreck, who is also Scientific Director of the International Bee Research Association (IBRA).

For full details of the Sussex Plan and other research into social insects, see the LASI website:
http://www.sussex.ac.uk/research/researchgroups/lasi/