Meetings of ACS Monterey Bay
ACS Monterey Bay Program for February 2012
Humans use hearing as well as vision and smell to navigate
our environment, and because light transmits so efficiently through
air many of us depend heavily on our visual sense. Water on the other
hand transmits light poorly so animals submerged more than a few hundred
feet are always in a dark world - illuminated only by bioluminescence.
Fortunately sound transmits very efficiently through water, so most
marine life has adapted to their acoustic environment with an amazing
array of sound-perceptual mechanisms. The cetaceans, whales, dolphins,
and porpoises have evolved complex bio-sonars that the odontocetes
(toothed whales) use to perceive very fine details of their surroundings,
and the mysticetes may use to navigate across ocean basins. Because
sound is so important to these animals, marine noise pollution from
shipping, seismic surveys (for oil and gas), and a growing array of
sonars and acoustical communication systems is seriously compromising
their bio-acoustic habitat.
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