domingo, 2 de março de 2008

Foto do Dia NatGeo 01 03 2008





Bison Herd, Yellowstone National Park, Wyoming, 1996
Photograph by Raymond Gehman
Bison thrive in Wyoming's Yellowstone National Park years after fires swept through more than a third of the park. Ecologists now regard wildfires as natural and beneficial in forest ecosystems. They return nutrients to the soil by burning dead or decaying matter, burn off disease-ridden plants and insects, and clear thick canopies and undergrowth, allowing a new generation of seedlings to grow.
(Photo shot on assignment for, but not published in, "Essential Element of Fire," September 1996, National Geographic magazine)

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