Acoustic Masking in Marine Ecosystems: Intuitions, Analysis, and Implication
Vol. 395: 201–222, 2009 MARINE ECOLOGY PROGRESS SERIES Published December 3 doi: 10.3354/meps08402 Mar Ecol Prog Ser Contribution to the Theme Section ‘Acoustics in marine ecology’ OPENPEN ACCESSCCESS Acoustic masking in marine ecosystems: intuitions, analysis, and implication Christopher W. Clark1,*, William T. Ellison2, Brandon L. Southall3, 4, Leila Hatch5, Sofie M. Van Parijs6, Adam Frankel2, Dimitri Ponirakis1 1Bioacoustics Research Program, Cornell Laboratory of Ornithology, 159 Sapsucker Woods Road, Ithaca, New York 14850, USA 2Marine Acoustics, 809 Aquidneck Avenue, Middletown, Rhode Island 02842, USA 3Southall Environmental Associates, 911 Center Street, Suite B, Santa Cruz, California 95060, USA 4Long Marine Laboratory, University of California, Santa Cruz, 100 Shaffer Road, Santa Cruz, California 95060, USA 5Gerry E. Studds Stellwagen Bank National Marine Sanctuary, NOAA, 175 Edward Foster Road, Scituate, Massachusetts 02066, USA 6 NOAA Fisheries, Northeast Fisheries Science Center, 166 Water Street, Woods Hole, Massachusetts 02543, USA ABSTRACT: Acoustic masking from anthropogenic noise is increasingly being considered as a threat to marine mammals, particularly low-frequency specialists such as baleen whales. Low-frequency ocean noise has increased in recent decades, often in habitats with seasonally resident populations of marine mammals, raising concerns that noise chronically influences life histories of individuals and populations. In contrast to physical harm from intense anthropogenic sources, which can have acute impacts on individuals, masking from chronic noise sources has been difficult to quantify at individ- ual or population levels, and resulting effects have been even more difficult to assess. This paper pre- sents an analytical paradigm to quantify changes in an animal’s acoustic communication space as a result of spatial, spectral, and temporal changes in background noise, providing a functional defini- tion of communication masking for free-ranging animals and a metric to quantify the potential for communication masking.
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