Abstract
Seasonal occurrence of fin whale song off Juan Fernandez, Chile
Highlights
Fin whales Balaenoptera physalus were the species of baleen whale most widely caught by commercial whaling fleets off the Chilean coast, comprising 46.9% of all catches, totaling 4512 individuals between 1929 and 1983 (Aguayo-Lobo et al 1998).Most catches off the Chilean coast were concentrated in central and northern Chile around 35° S, 32° S, and 19° S (Aguayo-Lobo et al 1998)
Data from 2007−2009 and 2014−2016 were analyzed; no data were available between 27 February 2010 and 22 April 2014 due to a tsunami that hit the Chilean coast and the Juan Fernandez Archipelago (JFA) on 27 February 2010 destroying the HA03 station, which was eventually repaired in April 2014
The power spectral density (PSD) plot indicates no frequency shift in the 17 Hz note over the study period, but a slight shift in the frequency of the 85 Hz high-frequency component (HFC) was apparent, from 87 Hz in 2007 to 85 Hz in 2016, i.e. a rate of −0.22 Hz yr−1
Summary
Fin whales Balaenoptera physalus were the species of baleen whale most widely caught by commercial whaling fleets off the Chilean coast, comprising 46.9% of all catches, totaling 4512 individuals between 1929 and 1983 (Aguayo-Lobo et al 1998).Most catches off the Chilean coast were concentrated in central and northern Chile around 35° S, 32° S, and 19° S (Aguayo-Lobo et al 1998). Off coastal northern-central Chile, in the waters surrounding Isla Chañaral, which form part of the coastal islands that make up the Humboldt Penguin National Reserve (~29°S), high summertime aggregations of fin whales have been reported feeding off Humboldt Current krill Euphausia mucronata (Capella et al 1999, Perez et al 2006, Toro et al 2016). Outside of these summertime sightings of fin whales, the question of where fin whales spend the rest of the year remains unknown
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