Posted by: Team - Bowhead whale | May 17, 2011

Decreasing singing acivity

As we (Outi and Mads) have mooved from the employees building at AS to our little cottage in the centre of the town, we have been a little behind schedule in our research. Luckily the hydrophone station has been running well doing continuous recordings for more than 6 weeks now.  After 4 weeks we opened a bottle of wine to celebrate it, as the first attempt in 2007 to put out hydrophones was crushed by ice after only 6 days. So 6 weeks of successful recordings was a reason to celebrate.

Spectrogram of a bowhead whale song from 2011.

The singing activity is steeply declining in May as in the previous years. Most of the time only wave noise is being recorded although there are still plenty of bowheads in the area. On the days where we are not able to get out to sea we often get reports from hunters who know that observations of bowheads do have our interest. Still now the number of observations is still high but singing is almost nonexistent.

Song activity of bowhead whales in Disko Bay in 2005 and 2007. Tervo et al. 2009