Articles | Volume 15, issue 1
Ocean Sci., 15, 75–82, 2019
Ocean Sci., 15, 75–82, 2019

Research article 31 Jan 2019

Research article | 31 Jan 2019

Discovering sounds in Patagonia: characterizing sei whale (Balaenoptera borealis) downsweeps in the south-eastern Pacific Ocean

Sonia Español-Jiménez et al.

Cited articles

Acevedo, C., Aguayo-Lobo, A., González, A., Haro, D., Olave, C., Quezada, F., Martínez, F., Garthe, S., and Cáceres, B.: Occurrence of sei whales (Balaenoptera borealis) in the Magellan Strait from 2004–2015, Chile, Aquat. Mamm., 43, 63–72, 2017. 
Aguayo-Lobo, A.: Baleen whales of continental Chile, in: The Whale Problem: A Status Report, edited by: Schevill, W. E., Harvard University Press, Harvard, 209–217, 1974. 
Aguayo-Lobo, A., Torres, D., and Acevedo J.: Los mamíferos marinos de Chile: I. Cetacea, Serie Científica INACH, 48, 19–159, 1998. 
Baker, C. S., Dalebout, M. L., Funahashi, N., Ma, Y. U., Steel, D., and Lavery, S.: Market surveys of whales, dolphins and porpoises in Japan and Korea, 2003–2004, with reference to stock identity of sei whales, Paper SC/56/BC3 presented to the IWC Scientific Committee, available from the IWC Office, June 2004 (unpublished). 
Baumgartner, M. F. and Fratantoni, D. M.: Diel periodicity in both sei whale vocalization rates and the vertical migration of their copepod prey observed from ocean gliders, Limnol. Oceanogr., 53, 2197–2209, 2008. 
Short summary
Sei whales are one of the least known baleen whales. We found them in southern Chile, on the Patagonian coast. We set up hydrophones in the Penas Gulf in 2016 and 2017 to investigate how this Patagonian sei whale might be communicating. We could identify sei whale downs-weep calls (a type of vocalization that starts at a high frequency and ends at a lower). We found that sei whales in the Penas Gulf perform calls distinctly differently from the sounds previously described.