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. The sei whale (Balaenoptera borealis) is one of the least knownwhale species. Information on sei whale distributions and its regionalvariability in the south-eastern Pacific Ocean are even more scarce than thatfrom other areas. Vocalizations of sei whales from this region are notdescribed yet. This research presents the first characterization of sei whalesounds recorded in Chile during the austral autumn of 2016 and 2017.Recordings were done opportunistically. A total of 41 calls were identifiedto be sei whale downsweeps. In 2016, calls ranged from an average maximumfrequency of 105.3 Hz down to an average minimum of 35.6 Hz over 1.6 swith a peak frequency of 65.4 Hz. During 2017, calls ranged from an averagemaximum frequency of 93.3 down to 42.2 Hz (over 1.6 s) with a peakfrequency of 68.3 Hz. The absolute minimum frequency recorded was 30 Hz andthe absolute maximum frequency was 129.4 Hz. Calls generally occurred inpairs, but triplets or singles were also registered. These low-frequencysounds share characteristics with recordings of sei whales near the Hawai'ianIslands but with differences in the maximum frequencies and duration. Thesecalls distinctly differ from sounds previously described for sei whales inthe Southern Ocean and are the first documented sei whale calls in thesouth-eastern Pacific.

ocean science

Discovering sounds in Patagonia: characterizing sei whale (&amp;lt;i&amp;gt;Balaenoptera borealis&amp;lt;/i&amp;gt;) downsweeps in the south-eastern Pacific Ocean