( rom aircraft noise. Dickson Hingson of...)Dinosaur hearing, listening to muscle noise, quieter cubicles

rom aircraft noise. Dickson Hingson of the Sierra Club's National Parks and Monument Committee (dhingson@infowest.com) will discuss the current status of these efforts, as a deadline of April 22, 2008 approaches for implementing the act. Leslie Blomberg of the Noise Pollution Clearinghouse will propose 10 ways to reduce noise in natural parks. For example, Blomberg says, the simple step of using quieter pavement materials could cut road noise in half in the main entrance of the Florida Everglades. Blomberg (npc@nonoise.org) notes that noise in national parks follows the same consistent pattern associated with other modern noise: the invention of new noise sources, the growth in use of those sources, and the spread of those sources into previously quiet areas. (Session 4aNSa)

CATCHING KILLER WHALES IN THE ACT

Catching killer whales hunting their prey has been difficult, in part because they appear to strike at night. Among the most elusive of killer whales are the "transient" type, so-named because they follow unpredictable paths as they travel from location to location along the west coast of North America. Transients, which also distinguish themselves by feeding primarily on other marine mammals such as seals, refrain from vocalizing while hunting so that prey will not be alerted to their presence. When they begin feeding, they become more vocal. Learning more about the foraging behavior of transients is important for understanding their important roles in the marine ecosystem. To increase opportunities for observing the whales, Kelly Newman (k.newman@sfos.uaf.edu) and Alan Springer of the University of Alaska deployed an autonomous recording unit to listen for them continuously off shore of a fur seal rookery in the Bering Sea in Alaska. They detected killer whale vocalizations on 19 of 20 days during last s
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Source:American Institute of Physics

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