Sentences with phrase «ragweed pollen produced»
They describe research showing that the quantity of ragweed pollen produced in doubled CO2 environments is increased significantly (61 percent), not because of large increases in size (~ 10 percent) but rather (apparently) due to a changing internal allocation of resources.
http://www.realclimate.org/ Not exact matches
If you look at the chart above you'll see that the amounts of pollen ragweed produces only went up by 1 gram per plant in almost 20 years.
This gets even worse the closer plants are to sources of carbon dioxide — ragweed growing next to highways produces more potent pollen than ragweed growing away from large roads.
«It is also important to add that climate change consequences will not be restricted to ragweed — and a range of other pollen - producing species are likely to be affected.
When academic allergist Sanjiv Sur at the University of Texas in Galveston and colleagues exposed mice to ragweed pollen, they noticed the animals produced highly - reactive forms of oxygen in their lungs after 15 minutes.
The itching produced by ragweed allergy is the same as that produced by oak pollen allergy.
Ragweed, specifically, grew faster, flowered earlier, and produced significantly more pollen in these urban conditions.
Now the Agricultural Research Service (ARS) has produced a study into 15 years of pollen data, investigating anecdotal signs of an increase in the ragweed pollen season - and whether it could be linked to climatic changes.