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(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

Índices no canto superior esquerdo de uma palavra indica o número da linha do texto original.

 

Os termos “feathered travelers” (linhas 6 e 7), “it” (linha 19) e “which” (linha 31) referem-se, respectivamente, a

A

ornithologists, bird movement e citizenscientists.

B

birds, Doppler e observations.

C


birds, Doppler e citizen-scientists.

D

ornithologists, Doppler e observations.

E

birds, bird movement e observations.