1. Institute of Marine Research, Marine Ecosystem Acoustics Group, Austevoll Research Station, Sauganeset 16, N-5392 Storebø, Norway
2. Rosenstiel School of Marine and Atmospheric Science, 4600 Rickenbacker Causeway, Miami, Florida 33149, United States
3. Institute of Marine Research, Nordnesgaten 50, 5005 Bergen, Norway