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September 2010 |
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Congratulations to Amy Kay Kerber and Laura Duffey for their writing, editing, and photographic contributions to this book!
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Full-color booklet with habitat & range info, id techniques & photos, and biological facts. Download or request a paper copy info.dnr@state.mn.us
This science journal, from the U.S. Forest Service, is written for middle and high school students and explores ecosystem services. Examples of ecosystems services include clean air and water, beautiful landscapes, healthy soil, places for wildlife to live, minerals, and even places to do outdoor activities. Order your free classroom set in English or Spanish.
New, online bird call resource for 25 common Minnesota birds from the Minnesota DNR.
From the U.S. Global Change Research Program to aid educators in teaching how climate change is affecting our nation's wildlife and public lands, and how everyone can become a "climate steward." |
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Don't Blame the Goldenrods!
Hayfever, so called because symptoms occur during the haying season, is essentially an allergy caused by pollen, dust, molds, or other substances. It is also known as allergic rhinitis or pollenosis. Seasonal hayfever is usually due to pollen from trees, grasses, or weeds. Plants with wind-borne pollen, such as the ragweeds, are the major culprits. Plants that depend on insects for pollination, such as the goldenrods, are rarely involved. Goldenrod pollen is sticky and heavy and not adapted for wind dissemination. Both common and giant ragweed cause hayfever symptoms. The flowers of ragweed have no petals and so pass unnoticed; however, they produce tremendous amounts of pollen, more than a billion pollen grains per plant per season. Common ragweed grows to about 36 inches while giant ragweed can reach 13 feet in height. There are about forty-one species worldwide but Ambrosia artemisiifolia (common ragweed) is the most frequently found species in North America. The giant ragweed, Ambrosia trifida, is also widely distributed. |
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