1. Department of Ocean Sciences, Rosenstiel School of Marine & Atmospheric Science, 4600 Rickenbacker Causeway, Miami, FL 33149–1098, USA.
2. Institute of Marine Research, Marine Ecosystem Acoustics Research Group, Austevoll Research Station, Sauganeset 16, 5392 Storebø, Norway.
3. Grótti ehf., Grundarstíg 4, 101 Reykjavík, Iceland.