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Bird 'breathalyzer' helps assess migratory diet

KINGSTON, R.I. -- November 24, 2003 -- While breathalyzers help police crack down on drunk driving, a similar new device is helping a University of Rhode Island graduate student analyze the dietary changes of migrating songbirds.

Just as human breathalyzers measure an individual's blood-alcohol level, David Podlesak says that his bird breathalyzer measures the "carbon signature" of a bird's last meal.

"We measure the ratio of the isotopes of carbon 12 to carbon 13, and this carbon signature in their breath can tell us what the bird ate earlier in the day," said the 36-year-old Wakefield resident who is nearing completion of his doctorate.

Podlesak is the first to adapt and use the bird breathalyzer on small songbirds and to verify that the measurements are accurate. The device was created recently by Kent Hatch at Brigham Young University for use with pigeons.

The birds breathe into a small mask connected to a balloon filled with pure oxygen. As the bird inhales the oxygen, it exhales carbon dioxide, replacing the oxygen in the balloon with carbon dioxide within one minute. The carbon dioxide is then analyzed for its carbon signature.

This carbon signature slowly makes its way from the bird's breath to its blood and eventually into its feathers. Podlesak is the first to use carbon signatures in different tissues from the same bird to create a dietary timeline for migrating birds.

"The signature in the feather tells us what the bird ate on its breeding grounds a month or two ago; the signature in its red blood cells tells what it ate within the last two or three weeks; and the signature in its plasma indicates what it ate two or three days ago," Podlesak said. "If the signature is different between its feathers and its breath, that says that the bird ate something different or changed its diet and is using a different resource to fatten up on migration."

That's an important distinction, according to Podlesak. "If bird
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Contact: Todd McLeish
tmcleish@uri.edu
401-874-7892
University of Rhode Island
24-Nov-2003


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