[MARMAM] New paper: Mid-frequency broadband sounds of Blainville’s beaked whales
cdunn at bahamaswhales.org
Sat Jan 12 12:30:51 PST 2013
We are pleased to announce a new publication on some new beaked whale sounds, click here to get to the article; http://www.tandfonline.com/doi/full/10.1080/09524622.2012.757540
Additionally, samples of the sounds are available here; http://www.bahamaswhales.org/news/2012/news_Dec12.html
Citation: Dunn, C., Hickmott, L., Talbot, D. and Boyd, I. 2013. Mid-frequency broadband sounds of Blainville's beaked whales. Bioacoustics. DOI:10.1080/09524622.2012.757540
Recordings from acoustic tags show that five Blainville’s beaked whales produced mid-frequency broadband sounds on all of their deep dives, with each sex producing two different sound types. These broadband sounds are atypical of the regular echolocation sounds previously described for this species. One male produced a total of 75 sounds over four dives, between the depths of 109 and 524 meters, and four females produced a total of 71 sounds over 18 dives, between the depths of 305 and 1289 meters. Ninety-six percent of the male sounds and 42 percent of the female sounds were produced before the onset of foraging echolocation sounds, and all were produced before the deepest point of the dives. Apparent source levels of the sounds ranged from 124 to 132dB RMS re 1mPa at 1m. These sounds may be candidate communication signals, with their production timed to mitigate the risk of both predation and hypoxia.
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