1. COPAS Sur‐Austral University of Concepción Barrio Universitario s/n Concepción 4030000 Chile
2. Woods Hole Oceanographic Institution Biology Department Woods Hole Massachusetts 02543 U.S.A.
3. Instituto de Ciencias Marinas y Limnológicas Universidad Austral de Chile Campus Isla Teja Valdivia Chile
4. Applied Physics Laboratory University of Washington Seattle Washington 98105 U.S.A.
5. Bioacoustics Research Program Cornell Laboratory of Ornithology Cornell University Ithaca New York 14850 U.S.A.