Stripes on petal veins direct bumblebees to the flower's "central landing platform" and entrance to gather nectar and pollen.
BBC: A bumblebee extracting nectar and pollen from a snapdragon
This has led to a huge rise in allergens and pollen in the air, which can trigger asthma attacks.
He also said the approximately 250 species of bees in the UK need high temperatures to gather nectar and pollen.
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"All over the city, flowers are now blooming, providing nectar and pollen for all sorts of important bee species and other pollinators, " she said.
"We know that honeybees can fly over 10km from their hive to a patch of flowers to collect food (nectar and pollen) and then fly home - a round trip of over 20km, " says Dr Raine.
Although the Internet-based pollen watchers and widgets are relatively new, the process of collecting and counting pollen has been going on for decades, and the results typically are published in local newspapers.
"People who are diagnosed with asthma that is made worse by pollen and people who have been diagnosed with seasonal allergic rhinitis need to keep track of pollen and other outdoor allergen levels, " says Dr. William Lunn, the director of the interventional pulmonary service at Baylor College of Medicine, in Houston.
She and her colleagues measured honey production, bee deaths, weight gain of colonies while foraging on canola, and insecticide residue on bees and in pollen, nectar, beeswax and honey.
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So yes, there will be more ragweed pollen, and somewhat more pollen from all plant species.
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"As you increase CO2 (carbon dioxide), it tells the allergenic plants to produce more pollen to the tune of three to four times more, and the pollen itself, we think, may actually be more potent, " Bassett said.
He said unseasonably warm temperatures led to relatively high levels of cedar and elm pollen.
Warmer temperatures, we are told, mean longer growing seasons and longer pollen seasons for nuisance plants such as ragweed.
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How will we survive longer, stronger allergy seasons and a pollen apocalypse?
When it is time to make the plants male again, researchers spray on a chemical (which might also prove a money-spinner for the company) to trigger the activity of another foreign gene that blocks the activity of ribonuclease and allows pollen production once more.
Six limbs, each outfitted with spiny, comblike hair, collect pollen and relay it to saddlebags, called corbiculae.
They exposed some, via contaminated pollen and sugar water, to high doses of imidacloprid, a type of neonicotinoid insecticide.
Dr Epstein offers a novel twist: he thinks that rising carbon dioxide concentrations may be promoting the growth of ragweed, pollen and fungus.
Here's what Key Ingredients served in homage to this movie, thanks to the efforts of Chef John Karangis: white chocolate ganache with strawberries, fennel pollen and rhubarb-buttermilk sorbet.
It assessed the possible threats to the pollinators from exposure to residues in pollen and nectar, dust and guttation fluid (some plants exude sap in the form of droplets).
"We need to assess the risks from this Bt pollen and then balance those with the proven benefits and then decide, objectively, what is better for the environment, " he told the BBC.
Applied to the soil, sprayed on the crop or used as a seed treatment, they eventually reach the pollen and nectar, which is ingested by insects, discouraging pests from wrecking havoc on crops.
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High pollen counts and - as you'd expect - high UV levels will be a feature on most days.
"Severe weather patterns can bring higher temperatures, higher pollen levels and increased exposure to mold, resulting in spring allergies that can peak stronger and last longer, " Dr. Bill Berger, a California allergist, said in the statement.
Although the South suffers from weed and mold spore allergies in the fall, Gerald Kress, an executive with SDI Health, which operates Pollen.com, says the North and Northeast gets hit particularly hard by ragweed -- and 2009 is shaping up to be a banner year for ragweed pollen.
Pollen covers concrete and cars, and daily smog advisories are posted on freeways.
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Dr Hume said the team had also found thousands of leaves, wood, pollen, tree and shrub seeds including the famous dodo tree (Tambalacoque), plus a large number of small land snails and insect parts.
BBC: NEWS | Science/Nature | Dodo skeleton find in Mauritius
Despite big promises, few air purifiers can rid your home of irritants like pollen, dust, and smoke.
The data was obtained from marine fossils, as well as pollen records from lakes and ice cores from Greenland.
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