Monday, February 13, 2012

Acoustic Pollution Threatens Marine Life By: Kimberly Ovitz

For thousands of years, the depths of the ocean were unreachable by humankind – either  a dark abyss or tropical seascape, which only seaman’s tales described. Though more recently humans have made considerable achievements in underwater research, our knowledge of the oceans remains quite minimal in relation to its vastness. Like on land, noise is a common phenomenon underwater and a most integral one. Marine animals’ dependence on noise for communication forces us to recognize a serious and substantial human impact on the underwater community: noise pollution.

Increasing industrial and military interest in the ocean has spurred human penetration into the depths like never before, leaving significant destruction in its wake. In waters surrounding the United States and around the globe, the existence of anthropogenic noise pollution in marine habitats has already displayed severe consequences and is of growing concern. The source of this pollution varies, but is largely the result of shipping industries, oil drilling industries and specifically, U.S. military testing. Despite significant evidence that noise pollution has harmful, even deadly effects on marine life, the industries mentioned above continue to act with utter disregard for the effects of their marine noise emissions.

Noise is a common occurrence below the ocean surface as a product of meteorological forces, marine communication and marine animal mating. Sound travels swiftly over vast expanses of underwater terrain, making it an integral means of marine mammal communication. This sound emission is crucial to the survival of marine mammals and other species for the purposes of mating, locating food sources, and communicating threats. Anthropogenic noise, or ‘acoustic pollution,’ directly interferes with this system of communication and death and destruction can result. Depending on the origins and degree of acoustic pollution, consequences vary from disorientation to fleeing of habitat, physical bodily harm and even death.

The primary causes of noise pollution include sound emissions from shipping industry boats and reflection seismology, utilized in mapping the ocean floor for both oil drilling purposes and extensive SONAR testing initiatives to detect submarine threats, run by the United States Navy. Shipping noise emission serves as a chronic source of pollution, and while not as acutely severe, can often interfere with marine life habitat when high-traffic shipping passages and migratory paths overlap, resulting in constant disorientation of marine creatures. Reflection seismology and Navy SONAR use is drastically more intensive, as is the impact on animal life.

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