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Research Article

Analysis of echolocation click signals of Indo-Pacific bottlenose dolphin (Tursiops aduncus) in Jeju Island

제주 남방큰돌고래 반향정위 클릭음 특성 분석

Kang-Hoon Choi1
,
Young Geul Yoon2
,
Sunhyo Kim1
,
Hyeonsu Kim1
,
Jee Woong Cho∗1
,
Ho Seuk Bae3
,
Kyeongju Park4
최 강훈1
,
윤 영글2
,
김 선효1
,
김 현수1
,
최 지웅1
,
배 호석3
,
박 경주4
1한양대학교 해양융합공학과
2국립수산과학원 고래연구센터
3국방과학연구소
4해군사관학교
∗Corresponding Author
31 January 2019. pp. 56-65
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Abstract

The Indo-Pacific bottlenose dolphins (Tursiops aduncus) are a toothed whale using echolocation clicks and have been studied continuously abroad. However, most studies on this whale’s clicks were performed about captive animals and, in Korea, only the studies of the whistle sounds of this animal were done. In this paper, acoustic characteristics of clicks were analyzed about the free-ranging Indo-Pacific bottlenose dolphins living in the coast of the Jeju Island. Acoustic parameters such as signal duration, 1st and 2nd peak frequency, 3 dB and 10 dB bandwidth for acoustic characteristics were calculated and compared with those of Australian species. As a result, the signal durations had average of 38 µs and most clicks were within range of 20 µs - 60 µs. The two types of bandwidths showed both narrowband and broadband characteristics, and bimodal signal characteristics were confirmed through the 1st peak frequencies(average of 96 kHz ± 18 kHz) and the 2nd peak frequencies(average of 69 kHz ± 19 kHz).

Keywords
Indo-Pacific bottlenose dolphin
Echolocation clicks
Acoustic parameters
Bimodal

남방큰돌고래(Tursiops aduncus)는 클릭음을 사용하는 이빨고래로써 국외에서 지속적인 연구가 수행되어 왔다. 그러나 남방큰돌고래의 클릭음에 대한 연구는 대부분 사육중인 개체에 대해 이루어졌으며 국내에서는 휘슬음에 관한 연구만 수행되었다. 본 논문에서는 제주 연안에 서식하는 야생개체의 남방큰돌고래 클릭음에 대한 음향특성을 분석하였다. 음향특성을 분석하기 위해 음향 파라미터인 신호 길이, 첫 번째 피크 주파수, 두 번째 피크 주파수, 3 dB 대역폭 및 10 dB 대역폭을 산출하였으며 호주 서식 종의 클릭음 음향특성과 비교하였다. 결과적으로, 신호 길이는 평균 38 µs를 나타냈고 대부분의 클릭음이 20 µs - 60 µs 범위 내에 속하였다. 2종류의 대역폭의 경우 협대역과 광대역의 주파수 특성 모두 나타냈으며, 첫 번째 피크 주파수(평균 96 kHz ± 18 kHz)와 두 번째 피크 주파수(평균 69 kHz ± 19 kHz)를 통해 바이모달 신호 특성을 확인하였다.

키워드
남방큰돌고래
반향정위 클릭음
음향 파라미터
바이모달
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Information
  • Publisher :The Acoustical Society of Korea
  • Publisher(Ko) :한국음향학회
  • Journal Title :The Journal of the Acoustical Society of Korea
  • Journal Title(Ko) :한국음향학회지
  • Volume : 38
  • No :1
  • Pages :56-65
  • Received Date : 2018-08-31
  • Revised Date : 2018-10-15
  • Accepted Date : 2019-01-25
  • DOI :https://doi.org/10.7776/ASK.2019.38.1.056
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