Anthropogenic noise in the sea is generated
by military activities, commercial shipping, oil exploration,
scientific research, coastal construction, whale watching,
recreational boating and other human activities. These activities
may generate sound in the ocean at levels and frequencies
that adversely impact the behavior of marine mammals and other
marine life. Because underwater noise can travel thousands
of miles through the ocean, its impacts may be international
in scope. The issue is further complicated by scientific uncertainty—the
effects of sound on marine mammals and other marine life are
not well understood. Moreover, trends in manmade noise are
difficult to determine because measurements of ambient noise
at the same location over time rarely exist.
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Locations
of whale strandings in the Bahamas, March 2001.
Stranded species included Blainville’s
beaked whales (Md), Minke whales (Ba), Cuvier’s
beaked whales (Zc), and spotted dolphins (Sf).
A joint NMFS/Navy report found that Mid-range
frequency military sonars were the most plausible
source of death |
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