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http://dx.doi.org/10.3796/KSFT.2015.51.2.195

Relationship between roar sound and regional groups of Steller sea lion, Eumetopias jubatus  

Park, Tae-Geon (Team of Education and Research, Korea Institute of Maritime and Fisheries Technology)
Iida, Kohji (Division of Marine Bioresource and Environmental Science, Hokkaido University, Graduate School of Fisheries Sciences)
Kim, Wook-Sung (Team of Education and Research, Korea Institute of Maritime and Fisheries Technology)
Kim, Sung-Ki (Team of Education and Research, Korea Institute of Maritime and Fisheries Technology)
Kim, Seok-Jae (Team of Education and Research, Korea Institute of Maritime and Fisheries Technology)
Ryu, Kyong-Jin (Team of Education and Research, Korea Institute of Maritime and Fisheries Technology)
Lee, Yoo-Won (Team of Education and Research, Korea Institute of Maritime and Fisheries Technology)
Publication Information
Journal of the Korean Society of Fisheries and Ocean Technology / v.51, no.2, 2015 , pp. 195-202 More about this Journal
Abstract
Hundreds of Steller sea lions, Eumetopias jubatus, migrate from Sakhalin and the northern Kuril Islands to Hokkaido in Japan every winter. During this migration, they may use their roaring sounds to navigate and to maintain their groups. We recorded the roars of wild Steller sea lions that had landed on reefs on the west coast of Hokkaido, and those of captive sea lions, while making video recordings. The fundamental frequency ($F_0$), Formant frequency ($F_1$), pulse repetition rate (PRR), and duration of syllables (T) were analyzed using a sonagraph. $F_0$, $F_1$, and PRR of the roars emitted by captive sea lions increased in the order male, female. By contrast, the $F_1$ of wild males was lower than that of females, while the $F_0$ and PRR of wild males and females did not differ statistically. These results suggest regional differences between the five groups showed that.
Keywords
Steller sea lion; Eumetopias jubatus; Roar sound; Regional groups; Acoustic characteristic;
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