These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


PUBMED FOR HANDHELDS

Search MEDLINE/PubMed


  • Title: Speaking up: Killer whales (Orcinus orca) increase their call amplitude in response to vessel noise.
    Author: Holt MM, Noren DP, Veirs V, Emmons CK, Veirs S.
    Journal: J Acoust Soc Am; 2009 Jan; 125(1):EL27-32. PubMed ID: 19173379.
    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 (1-40 kHz). Results show that whales increased their call amplitude by 1 dB for every 1 dB increase in background noise levels. Furthermore, nearby vessel counts were positively correlated with these observed background noise levels.
    [Abstract] [Full Text] [Related] [New Search]