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Clicks of dwarf sperm whales (Kogia sima)

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Abstract

The two species of the genus Kogia are widely distributed throughout the world's temperate and tropical oceans, but because they are small and highly cryptic, they are difficult to monitor. The acoustic signals of K. breviceps have been described previously, but the signals of K. sima have remained unknown. Here we present three recordings of K. sima, two from free-ranging animals and one from a captive setting, representing both the Atlantic Ocean and Pacific Ocean. The acoustic signals of K. sima are very similar to the signals of K. breviceps and other species that have narrow-band, high-frequency (NBHF) clicks. Free-ranging K. sima produce “usual” clicks that have mean peak and centroid frequencies of 127–129 kHz, mean −3 dB bandwidth of 10 kHz, mean −10 dB bandwidth of 16–17 kHz, and mean interclick interval of 110–164 ms. Although K. sima clicks cannot yet be distinguished from those of K. breviceps or other NBHF clicking species, our detailed description of this species' signals reveals the similarities between the two Kogia species, and thus allows for passive acoustic monitoring of the genus Kogia in regions where other NBHF species are not present.
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Original languageEnglish
Pages (from-to)963-978
JournalMarine Mammal Science
Volume34
Issue number4
Early online date22 Feb 2018
DOIs
Publication statusPublished - 24 Oct 2018

    Research areas

  • Kogia sima, Dwarf sperm whale, Narrow-band high-frequency, Echolocation, Biosonar, Click, The Bahamas, Florida, Atlantic, Guam, Pacific

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