Accession Number : ADA573921


Title :   3S2 - Behavioral Response Studies of Cetaceans to Navy Sonar Signals in Norwegian Waters


Descriptive Note : Annual rept.


Corporate Author : SAINT ANDREWS UNIV (UNITED KINGDOM)


Personal Author(s) : Tyack, Peter


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA573921


Report Date : 30 Sep 2012


Pagination or Media Count : 9


Abstract : One primary goal of this international cooperative research program is to investigate behavioral reactions and the sound exposures required to elicit them of three species of whales: bottlenose whales, minke whales, and humpback whales to Naval Active Sonar signals in the 1-10 kHz range. The results will be interpreted to generate dose-response functions, in order to help establish safety limits for sonar operations for these species. Another primary goal of the program is to experimentally assess the effectiveness of ramp-up, a common mitigation protocol in which source levels are gradually increased prior to the onset of full-level transmissions. Ramp-up is designed to give nearby animals some time to move away before sonar transmissions reach maximum levels. However, it is unknown whether or not this protocol is actually effective for animals in their natural environment. We have developed and implemented an experimental design to test whether the ramp-up procedure is an effective protocol to reduce risk of harm from sonar activities.


Descriptors :   *RESPONSE(BIOLOGY) , *SONAR SIGNALS , *WHALES , BEHAVIOR , CETACEA , EXPOSURE(PHYSIOLOGY) , SENSITIVITY , THRESHOLDS(PHYSIOLOGY) , UNDERWATER SOUND


Subject Categories : Biological Oceanography
      Acoustic Detection and Detectors


Distribution Statement : APPROVED FOR PUBLIC RELEASE