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Speaking up: Killer whales (Orcinus orca) increase their call amplitude in response to vessel noise
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FIG. 1.

Examples of killer whale calls recorded from an estimated range of in different noise levels based on measurements between 1 and (a) S1 call in noise level of re and (b) S1 call in noise level of re . Arrows indicate the call in the time series.

Image of FIG. 2.

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FIG. 2.

(a) Killer whale call source level (S1 call type) as a function of background noise level, both based on measurements between 1 and . (b) Background noise level as a function of the number of vessels within from the hydrophone.

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/content/asa/journal/jasa/125/1/10.1121/1.3040028
2008-12-22
2014-04-16

Abstract

This study investigated the effects of anthropogenic sound exposure on the vocal behavior of free-ranging killer whales. Endangered Southern Resident killer whales inhabit areas including the urban coastal waters of Puget Sound near Seattle, WA, where anthropogenic sounds are ubiquitous, particularly those from motorized vessels. A calibrated recording system was used to measure killer whale call source levels and background noise levels . Results show that whales increased their call amplitude by for every increase in background noise levels. Furthermore, nearby vessel counts were positively correlated with these observed background noise levels.

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Scitation: Speaking up: Killer whales (Orcinus orca) increase their call amplitude in response to vessel noise
http://aip.metastore.ingenta.com/content/asa/journal/jasa/125/1/10.1121/1.3040028
10.1121/1.3040028
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