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Sound research at Acoustical Society meeting
Date:5/9/2011

ch.may11/asa213.html">http://asa.aip.org/web2/asa/abstracts/search.may11/asa213.html

The Effects of Long-Term Noise Increases on Fish

There are two different kinds of man-made noises in aquatic environments. One is very loud and transient the product of activities such as pile driving or seismic exploration. The other is less intense but relentless, say, from shipping or offshore wind farms. "These sounds increase the general noise level over a very large area for example, over a whole harbor and the animals there cannot escape," explains neuroscientist Arthur Popper, a professor of biology at the University of Maryland, College Park. Most studies have focused on the effects of the first type of sound the intermittent booms and blasts that can raise background sound levels as much as 180 decibels and cause hearing loss and other physiological problems in animals. But even the less intense noises, which can increase background noise by 10 decibels or less, may have profound effects on the health and well-being of animals, Popper says. The stress of constant noise, for example, can cause changes in the hormone levels of fish. "Moreover," he says, "the increase in background noise will 'mask' the ability of animals to hear sounds in their environment that may be important." For instance, higher levels of background noise may prevent fish from hearing the sounds of their prey or their predators or hamper their ability to communicate with their own kind. The presentation 1pABa6, "The implications of long-term increases of anthropogenic noise on fish," is in the afternoon session on Monday, May 23 in the Issaquah room. Abstract: http://asa.aip.org/web2/asa/abstracts/search.may11/asa141.html


Highlights: Tuesday, May 24

Weather Report: Cloudy with a Chance of Loud

According to a team of acoustics researchers led by N
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Contact: Charles E. Blue
cblue@aip.org
301-209-3091
American Institute of Physics
Source:Eurekalert

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