Journal of the Korean Society of Fisheries and Ocean Technology (수산해양기술연구)

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
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Relationship between roar sound and regional groups of Steller sea lion, Eumetopias jubatus

큰바다사자의 명음과 지역적 그룹과의 관계

  • 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)
  • 박태건 (한국해양수산연수원 교육연구팀) ;
  • 이이다 코지 (홋카이도대학 대학원 해양생물자원과학전공) ;
  • 김욱성 (한국해양수산연수원 교육연구팀) ;
  • 김성기 (한국해양수산연수원 교육연구팀) ;
  • 김석재 (한국해양수산연수원 교육연구팀) ;
  • 류경진 (한국해양수산연수원 교육연구팀) ;
  • 이유원 (한국해양수산연수원 교육연구팀)
  • Received : 2015.03.11
  • Accepted : 2015.04.10
  • Published : 2015.05.31
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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.

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