(ITA - 2004 - 1a Fase)And Now, the Birdcast1Passin

(ITA - 2004 - 1a Fase)

And Now, the Birdcast
¹Passing almost unnoticed in the night, billions of birds will fly over the mid-Atlantic states this spring on their ⁴annual migration northward. A new ⁵Web site will help ornithologists pinpoint ⁶critical habitat for the feathered ⁷travelers by combining weather radar ⁸data with old-fashioned fieldwork.
⁹Radar has been used to track bird ¹⁰migrations since around 1940, says ¹¹Steve Kelling, who heads BirdSource, a ¹²bird database at Cornell University. But the potential payoff grew about 5 years ago when the government began ¹⁵installing Doppler radar Stations, which ¹⁶yield high-resolution three-dimensional ¹⁷data. Ornithologists are eager to use ¹⁸Doppler to track bird movement, but ¹⁹first, they need to calibrate it with data ²⁰from the ground.
So Cornell, Clemson University, and other groups have launched BirdCast. Every few hours from 1 April to 31 May, radar images of the Philadelphia to ²⁵Washington, D. C., area – some filtered to remove weather and reveal birds – will be posted on the project’s Web site (www.birdcast.org). The site will also collect observations ³⁰from several hundred citizen-scientists ³¹(birdwatchers, that is), which will be ³²combined with other data, such as chirps ³³picked up by acoustic monitors. Kelling ³⁴says the results should reveal the bird’s ³⁵favorite rest stops, highlighting priority ³⁶areas for protection. Eventually, ³⁸BirdCast hopes to go nationwide.

SCIENCE Vol 288 7 April 2000

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Os termos “weather”, em “weather radar data” (linhas 7 e 8); “heads”, em “who heads BirdSource” (linha 11); e “rest”, em “bird’s favorite rest stops” (linhas 34 e 35) têm, respectivamente, as funções gramaticais de