Resource Links to the Honeybee Challenge
Marla Spivak: Bees Scholar
Posted September 2013
This is our life with bees, and this is our life without bees. Bees are the most important pollinators of our fruits and vegetables and flowers and crops like alfalfa hay that feed our farm animals. More than one third of the world's crop production is dependent on bee pollination.
But the ironic thing is that bees are not out there pollinating our food intentionally. They're out there because they need to eat. Bees get all of the protein they need in their diet from pollen and all of the carbohydrates they need from nectar. They're flower-feeders, and as they move from flower to flower, basically on a shopping trip at the local floral mart, they end up providing this valuable pollination service. In parts of the world where there are no bees, or where they plant varieties that are not attractive to bees, people are paid to do the business of pollination by hand. These people are moving pollen from flower to flower with a paintbrush. Now this business of hand pollination is actually not that uncommon. Tomato growers often pollinate their tomato flowers with a hand-held vibrator. Now this one's the tomato tickler. (Laughter) Now this is because the pollen within a tomato flower is held very securely within the male part of the flower, the anther, and the only way to release this pollen is to vibrate it. So bumblebees are one of the few kinds of bees in the world that are able to hold onto the flower and vibrate it, and they do this by shaking their flight muscles at a frequency similar to the musical note C. So they vibrate the flower, they sonicate it, and that releases the pollen in this efficient swoosh, and the pollen gathers all over the fuzzy bee's body, and she takes it home as food. Tomato growers now put bumblebee colonies inside the greenhouse to pollinate the tomatoes because they get much more efficient pollination when it's done naturally and they get better quality tomatoes.
So there's other, maybe more personal reasons, to care about bees. There's over 20,000 species of bees in the world, and they're absolutely gorgeous. These bees spend the majority of their life cycle hidden in the ground or within a hollow stem and very few of these beautiful species have evolved highly social behavior like honeybees.
Now honeybees tend to be the charismatic representative for the other 19,900-plus species because there's something about honeybees that draws people into their world. Humans have been drawn to honeybees since early recorded history, mostly to harvest their honey, which is an amazing natural sweetener.
I got drawn into the honeybee world completely by a fluke. I was 18 years old and bored, and I picked up a book in the library on bees and I spent the night reading it. I had never thought about insects living in complex societies. It was like the best of science fiction come true. And even stranger, there were these people, these beekeepers, that loved their bees like they were family, and when I put down the book, I knew I had to see this for myself. So I went to work for a commercial beekeeper, a family that owned 2,000 hives of bees in New Mexico. And I was permanently hooked.
Honeybees can be considered a super-organism, where the colony is the organism and it's comprised of 40,000 to 50,000 individual bee organisms. Now this society has no central authority. Nobody's in charge. So how they come to collective decisions, and how they allocate their tasks and divide their labor, how they communicate where the flowers are, all of their collective social behaviors are mindblowing. My personal favorite, and one that I've studied for many years, is their system of healthcare. So bees have social healthcare. So in my lab, we study how bees keep themselves healthy. For example, we study hygiene, where some bees are able to locate and weed out sick individuals from the nest, from the colony, and it keeps the colony healthy. And more recently, we've been studying resins that bees collect from plants. So bees fly to some plants and they scrape these very, very sticky resins off the leaves, and they take them back to the nest where they cement them into the nest architecture where we call it propolis. We've found that propolis is a natural disinfectant. It's a natural antibiotic. It kills off bacteria and molds and other germs within the colony, and so it bolsters the colony health and their social immunity. Humans have known about the power of propolis since biblical times. We've been harvesting propolis out of bee colonies for human medicine, but we didn't know how good it was for the bees. So honeybees have these remarkable natural defenses that have kept them healthy and thriving for over 50 million years.
So seven years ago, when honeybee colonies were reported to be dying en masse, first in the United States, it was clear that there was something really, really wrong. In our collective conscience, in a really primal way, we know we can't afford to lose bees. So what's going on? Bees are dying from multiple and interacting causes, and I'll go through each of these. The bottom line is, bees dying reflects a flowerless landscape and a dysfunctional food system.
Now we have the best data on honeybees, so I'll use them as an example. In the United States, bees in fact have been in decline since World War II. We have half the number of managed hives in the United States now compared to 1945. We're down to about two million hives of bees, we think. And the reason is, after World War II, we changed our farming practices. We stopped planting cover crops. We stopped planting clover and alfalfa, which are natural fertilizers that fix nitrogen in the soil, and instead we started using synthetic fertilizers. Clover and alfalfa are highly nutritious food plants for bees. And after World War II, we started using herbicides to kill off the weeds in our farms. Many of these weeds are flowering plants that bees require for their survival. And we started growing larger and larger crop monocultures. Now we talk about food deserts, places in our cities, neighborhoods that have no grocery stores. The very farms that used to sustain bees are now agricultural food deserts, dominated by one or two plant species like corn and soybeans. Since World War II, we have been systematically eliminating many of the flowering plants that bees need for their survival. And these monocultures extend even to crops that are good for bees, like almonds. Fifty years ago, beekeepers would take a few colonies, hives of bees into the almond orchards, for pollination, and also because the pollen in an almond blossom is really high in protein. It's really good for bees. Now, the scale of almond monoculture demands that most of our nation's bees, over 1.5 million hives of bees, be transported across the nation to pollinate this one crop. And they're trucked in in semi-loads, and they must be trucked out, because after bloom, the almond orchards are a vast and flowerless landscape.
Bees have been dying over the last 50 years, and we're planting more crops that need them. There has been a 300 percent increase in crop production that requires bee pollination.
And then there's pesticides. After World War II, we started using pesticides on a large scale, and this became necessary because of the monocultures that put out a feast for crop pests. Recently, researchers from Penn State University have started looking at the pesticide residue in the loads of pollen that bees carry home as food, and they've found that every batch of pollen that a honeybee collects has at least six detectable pesticides in it, and this includes every class of insecticides, herbicides, fungicides, and even inert and unlabeled ingredients that are part of the pesticide formulation that can be more toxic than the active ingredient. This small bee is holding up a large mirror. How much is it going to take to contaminate humans?
One of these class of insecticides, the neonicontinoids, is making headlines around the world right now. You've probably heard about it. This is a new class of insecticides. It moves through the plant so that a crop pest, a leaf-eating insect, would take a bite of the plant and get a lethal dose and die. If one of these neonics, we call them, is applied in a high concentration, such as in this ground application, enough of the compound moves through the plant and gets into the pollen and the nectar, where a bee can consume, in this case, a high dose of this neurotoxin that makes the bee twitch and die. In most agricultural settings, on most of our farms, it's only the seed that's coated with the insecticide, and so a smaller concentration moves through the plant and gets into the pollen and nectar, and if a bee consumes this lower dose, either nothing happens or the bee becomes intoxicated and disoriented and she may not find her way home. And on top of everything else, bees have their own set of diseases and parasites. Public enemy number one for bees is this thing. It's called varroa destructor. It's aptly named. It's this big, blood-sucking parasite that compromises the bee's immune system and circulates viruses.
Let me put this all together for you. I don't know what it feels like to a bee to have a big, bloodsucking parasite running around on it, and I don't know what it feels like to a bee to have a virus, but I do know what it feels like when I have a virus, the flu, and I know how difficult it is for me to get to the grocery store to get good nutrition. But what if I lived in a food desert? And what if I had to travel a long distance to get to the grocery store, and I finally got my weak body out there and I consumed, in my food, enough of a pesticide, a neurotoxin, that I couldn't find my way home? And this is what we mean by multiple and interacting causes of death.
And it's not just our honeybees. All of our beautiful wild species of bees are at risk, including those tomato-pollinating bumblebees. These bees are providing backup for our honeybees. They're providing the pollination insurance alongside our honeybees. We need all of our bees.
So what are we going to do? What are we going to do about this big bee bummer that we've created? It turns out, it's hopeful. It's hopeful. Every one of you out there can help bees in two very direct and easy ways. Plant bee-friendly flowers, and don't contaminate these flowers, this bee food, with pesticides. So go online and search for flowers that are native to your area and plant them. Plant them in a pot on your doorstep. Plant them in your front yard, in your lawns, in your boulevards. Campaign to have them planted in public gardens, community spaces, meadows. Set aside farmland. We need a beautiful diversity of flowers that blooms over the entire growing season, from spring to fall. We need roadsides seeded in flowers for our bees, but also for migrating butterflies and birds and other wildlife. And we need to think carefully about putting back in cover crops to nourish our soil and nourish our bees. And we need to diversify our farms. We need to plant flowering crop borders and hedge rows to disrupt the agricultural food desert and begin to correct the dysfunctional food system that we've created.
So maybe it seems like a really small countermeasure to a big, huge problem -- just go plant flowers -- but when bees have access to good nutrition, we have access to good nutrition through their pollination services. And when bees have access to good nutrition, they're better able to engage their own natural defenses, their healthcare, that they have relied on for millions of years. So the beauty of helping bees this way, for me, is that every one of us needs to behave a little bit more like a bee society, an insect society, where each of our individual actions can contribute to a grand solution, an emergent property, that's much greater than the mere sum of our individual actions. So let the small act of planting flowers and keeping them free of pesticides be the driver of large-scale change.
On behalf of the bees, thank you.
Chris Anderson: Thank you. Just a quick question. The latest numbers on the die-off of bees, is there any sign of things bottoming out? What's your hope/depression level on this?
Maria Spivak: Yeah. At least in the United States, an average of 30 percent of all bee hives are lost every winter. About 20 years ago, we were at a 15-percent loss. So it's getting precarious.
CA: That's not 30 percent a year, that's -- MS: Yes, thirty percent a year.
CA: Thirty percent a year. MS: But then beekeepers are able to divide their colonies and so they can maintain the same number, they can recuperate some of their loss.
We're kind of at a tipping point. We can't really afford to lose that many more. We need to be really appreciative of all the beekeepers out there. Plant flowers.
CA: Thank you.
Published on August 3, 2013
Bill Turnbull investigates one of the biggest mysteries in the British countryside: what is killing our bees. It is a question that generates huge controversy. Changes in the weather, pesticides and even a deadly virus have all been blamed. It is a question that Bill is all too familiar with as a beekeeper himself. He meets the scientists who are fitting minute radar transponders on to bees to try to find answers.
Published on November 19, 2012
Bees are dying in their millions. It is an ecological crisis that threatens to bring global agriculture to a standstill. Introduced by Martha Kearney, this documentary explores the reasons behind the decline of bee colonies across the globe, investigating what might be at the root of this devastation.
Honey bees are the number one insect pollinator on the planet, responsible for the production of over 90 crops. Apples, berries, cucumbers, nuts, cabbages and even cotton will struggle to be produced if bee colonies continue to decline at the current rate. Empty hives have been reported from as far afield as Taipei and Tennessee. In England, the matter has caused beekeepers to march on Parliament to call on the government to fund research into what they say is potentially a bigger threat to humanity than the current financial crisis.
Investigating the problem from a global perspective, the programme makers travel from the farm belt of California to the flatlands of East Anglia to the outback of Australia. They talk to the beekeepers whose livelihoods are threatened by colony collapse disorder, the scientists entrusted with solving the problem, and the Australian beekeepers who are making a fortune replacing the planet's dying bees. They also look at some of the possible reasons for the declining numbers - is it down to a bee plague, pesticides, malnutrition? Or is the answer something even more frightening?
“A Minute With…”
Published on April 19, 2013
University of Illinois at Urbana-Champaign, The Robinson Laboratory
Is there an effort to get a geographic sense of which bees are most affected?
Surveys have been done that report on the severity of bee losses by location, by state. The U.S. Department of Agriculture generates maps of how big the losses have been in different parts of the country. There’s no strong geographic pattern. This is because CCD losses occur in places where the most commercial beekeeping occurs and commercial beekeeping in general is on wheels – beehives are trucked throughout the country for pollination purposes.
There are several migratory routes that these hives follow. As many as two-thirds of the commercial honey bee colonies in America are moved to northern California for a period of two to three weeks just for almond pollination. CCD losses are greater in commercial beekeeping operations areas.
We've been observing declines for many years now. Are we any closer to understanding what’s going on?
Yes, we are closer, but progress is slower than we’d like because multiple factors are contributing to CCD. Moreover, there is pretty good evidence that there are synergies between these factors. This explanation is reasonable, but it doesn't mean that solutions will come quickly. It’s reasonable because we have a general intuition that many organisms in the environment are under increasing stress, that it’s harder to make a living in the environment these days than in the past because of anthropogenic changes. Whether one considers introduced pests or pathogens, degraded habitats or more extreme climate, it’s just harder to thrive out there. And so the notion that we are putting species closer to a tipping point is easy to grasp. What this means is that when an already stressed beehive is exposed to yet another factor, the bottom falls out and we see CCD, a complete colony collapse.
What factors do scientists think contribute to CCD?
First of all the varroa mite, a parasite of honey bees, has been the real game changer. It is not the cause of Colony Collapse Disorder but it is a huge factor. It has weakened bees by the pathogens that it harbors that it passes along to the bees and perhaps also by damage that it does directly to the bees.
There are also nutritional stresses associated with migratory beekeeping. When you use bees for pollination your objective is to benefit the plants, not the bees. Sometimes for a major crop like almonds, which blooms early in the spring, the fate of the whole crop depends on whether the temperature gets above bee-flight weather for just a few hours during the two-week bloom period. Sometimes it’s gorgeous and sunny every single day, and then there are many more bees than needed. But sometimes it’s touch-and-go for an entire bloom period, so farmers are willing to pay to ship in extra colonies as a kind of insurance, so that if there are a few windows of time of favorable weather, there will be enough bees to take care of the pollination, even in a very short time period.
The high density of bees is good for the plants and good for the farmers, but not good for the bees. The bees are often nutritionally stressed as a result of their pollination activities because their densities are too high. In addition, foraging in one homogenous agro-ecosystem for weeks at a time may not provide the optimal mix of nutrients for good bee health.
In addition to pathogens, parasites and poor nutrition, pesticides are also implicated. The newer pesticides are much safer for humans. They also are being applied in ways that make them safer to humans, but they also have negative effects on beneficial insects.
One topic that’s just starting to be examined is the synergy between the sublethal effects of pesticides and the effects of a pathogen, or a parasite, or poor nutrition. The effect of pesticides on bee health is a controversial topic. Some studies show strong damage to bees, and others do not. The situation right here in East Central Illinois illustrates this. Here, corn and soybean agriculture use one of the most controversial classes of insecticides, the neonicotinoids. But there are no problems in this area with Colony Collapse Disorder. We’re ground zero for neonicotinoid use but we have no documented cases of Colony Collapse Disorder.
Is this for the migratory, commercial bees?
No, this area is not a big commercial beekeeping area; this is an area dominated by hobbyists, so that’s a good point. There’s no question that insecticides kill bees, but as to the question of whether they are involved in CCD, the jury is still out.
Would it be possible to enhance the overall health of the honey bees with more home-grown, localized bee operations that stay in place and therefore stress the bees less?
There is right now a renaissance in beekeeping; there are many new beekeepers, and many have been stimulated to get involved primarily by the crisis of CCD, coupled with increased interest in local food production. These two separate trends have combined to lead to a strong surge in interest in hobby beekeeping. We have a number of new beekeepers here in this area, even some rooftop beekeepers in our urban areas, and many urban beekeepers in Chicago, New York City, San Francisco and so forth. But these are largely hobbyists or sideline beekeepers, as opposed to large commercial beekeepers. So while their local impact can be huge, they cannot affect large-scale agriculture. In modern agriculture, huge numbers of plants come into bloom at the same time and they need to be pollinated at the same time. Only large-scale commercial beekeepers can provide the millions of bees needed to get the job done.
Is there any overlap between declines in honey bees and declines in wild bees?
Yes. Bumble bees, the next best studied bees after honey bees, have experienced serious population declines. There is a feeling that honey bees are like the canary in the coal mine – and we’re all watching anxiously.
Published on August 22, 2013
"...There are a few other examples of foods that keep–indefinitely–in their raw state: salt, sugar, dried rice are a few. But there’s something about honey; it can remain preserved in a completely edible form, and while you wouldn't want to chow down on raw rice or straight salt, one could ostensibly dip into a thousand year old jar of honey and enjoy it, without preparation, as if it were a day old. Moreover, honey’s longevity lends it other properties–mainly medicinal–that other resilient foods don’t have. Which raises the question–what exactly makes honey such a special food?
The answer is as complex as honey’s flavor–you don’t get a food source with no expiration date without a whole slew of factors working in perfect harmony.
The first comes from the chemical make-up of honey itself. Honey is, first and foremost, a sugar. Sugars are hygroscopic, a term that means they contain very little water in their natural state but can readily suck in moisture if left unsealed. As Amina Harris, executive director of the Honey and Pollination Center at the Robert Mondavi Institute at University of California, Davis explains, “Honey in its natural form is very low moisture. Very few bacteria or microorganisms can survive in an environment like that, they just die. They’re smothered by it, essentially.” What Harris points out represents an important feature of honey’s longevity: for honey to spoil, there needs to be something inside of it that can spoil. With such an inhospitable environment, organisms can’t survive long enough within the jar of honey to have the chance to spoil..."
Read more: http://blogs.smithsonianmag.com/science/2013/08/the-science-behind-honeys-eternal-shelf-life/#ixzz2d84ov0PA
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