Volume 6, Issue 1, May 2009
Index of content:
The importance of incorporating signal characteristics in the evaluation of noise exposure impacts on marine life6(2009); http://dx.doi.org/10.1121/1.3168495View Description Hide Description
Auditory thresholds are used to establish mitigation guidelines for anthropogenic noise exposure on marine animals. These thresholds are determined using either sinusoidal signals at specific frequencies or band limited, sinusoidal-derived Gaussian noise. Given that the preponderance of naturally occurring noise in the marine environment is sinusoidal, marine animals may have lower thresholds, and thus lower tolerance to non-sinusoidal noise. Fast rise time impulse noise, continuous non-sinusoidal noise, or a combination of these characteristics may induce biological responses at lower levels than sinusoidal noise with an equivalent power density. The author proposes a metric to evaluate and express signal characteristics as a component of determining noise exposure impacts on marine animals.