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Killer whales, blind bats, discriminating dolphins, mating birds
Date:6/25/2008

ese include click pitch, echo duration, time-separation pitch, and timbre. "Unfortunately, we can't ask a dolphin the same question," Au admits, and humans might not rely on the same cues as dolphins, given the differences in their auditory systems. However, "Human listening studies can quickly identify salient combinations of echo features that permit object discrimination and also help refine dolphin experiments," he says.

Paper 2pUWa2, "Insights to dolphin sonar discrimination capabilities with human listening experiments" will be presented at 2:20 p.m. on Tuesday, July 1 in room AMPHI BORDEAUX.

10) ACOUSTIC TECHNIQUES FOR MONITORING BIRD MIGRATION

Most bird migration occurs under the cover of darkness, and presently there are almost no reliable or robust techniques for identifying which species are passing as they migrate. By recording the unique flight calls of birds as they fly by night, researchers can develop migration maps for each species that depict the routes and timing of migration. Knowing about these migration patterns is crucial for bird conservation because any plans to conserve birds' stopover habitats require detailed knowledge of the timing and location of their passage.

Andrew Farnsworth (af27@cornell.edu) of Cornell University's Laboratory of Ornithology has been using acoustical techniques to study bird migration patterns since 1991. For the past three years, a grant from the U.S. Department of Defense Legacy Resource Management Program has enabled his team to make great strides in the field.

Farnsworth will discuss the methods and scope of his work, which include deploying a recording device to record entire nights of migration for periods of up to 70 days and specially designed software for automatically extracting the sounds of interest from these recordings in order to map the patterns of bird calls as a function of time and location. His presentation wil
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Contact: Jason Bardi
jbardi@aip.org
301-209-3091
American Institute of Physics
Source:Eurekalert

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