Comparison of foraging strategy of dugongs in Red Sea and Andaman Sea - Effects of tidal change-

• Project/Area Number: 16H06158
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Single-year Grants
• Research Field: Conservation of biological resources
• Research Institution: Kyoto University
• Principal Investigator: Ichikawa Kotaro 京都大学, フィールド科学教育研究センター, 准教授 (70590511)
• Project Period (FY): 2016-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥25,090,000 (Direct Cost: ¥19,300,000、Indirect Cost: ¥5,790,000); Fiscal Year 2019: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2018: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000); Fiscal Year 2017: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000); Fiscal Year 2016: ¥8,580,000 (Direct Cost: ¥6,600,000、Indirect Cost: ¥1,980,000)
• Keywords: 受動的音響観察 / 潮下帯海草も場 / 潮間帯海草も場 / ジュゴン / 摂餌 / バイオロギング / 摂餌行動 / 音響バイオロギング / 摂餌生態 / スーダン / タイ / 音響観察 / 摂餌戦略

Outline of Final Research Achievements

Dugongs feed in both intertidal and subtidal seagrass beds. Why would they feed in the intertidal seagrass beds where accessible time is limited. We compared feeding times in both intertidal and subtidal seagrass beds. Feeding was most frequent during night times in spring tides in the intertidal seagrass bed and in neap tides in the subtidal seagrass bed. In both of the seagrass beds, the feeding was most frequent when the water depth was 1-1.5 m. These results suggest that dugongs feed mainly during night times and the timing of their feeding differs between the intertidal and the subtidal seagrass beds.

Academic Significance and Societal Importance of the Research Achievements

ジュゴンの摂餌様式の一端が明らかになった。従来の手法では明らかにできなかった情報を取得することができた。これにより、ジュゴンの生息海域を利用する現地コミュニティによる保護区設定に資する情報を提供することができた。2020年2月に実施された現地コミュニティ主催の会議で、摂餌の場所やタイミングに応じて保護区設定を検討する案が提示された。研究成果が実際の保護区設定に加味された。
このような情報は世界各地におけるジュゴン生息海域の保護策検討に貢献する。

Research Products

• [Int'l Joint Research] Phuket Marine Biological Center(タイ)
• [Int'l Joint Research] MareCet(マレーシア)
• [Int'l Joint Research] Phuket Marine Biological Center(タイ)
• [Int'l Joint Research] MareCet(マレーシア)
• [Int'l Joint Research] Phuket Marine Biological Center(タイ)
• [Int'l Joint Research] Red Sea University(スーダン)
• [Int'l Joint Research] マレヤ大学/リーフチェックマレーシア/The MareCet Research Organization(マレーシア)
• [Int'l Joint Research] 紅海大学/秋田大学(スーダン)
• [Int'l Joint Research] プーケット海洋生物学センター(タイ)
• [Journal Article] Differences in Vocalisation Patterns of Dugongs Between Fine-Scale Habitats Around Talibong Island, Thailand (2017)
  • Author(s): Tanaka Kotaro、Ichikawa Kotaro、Nishizawa Hideaki、Kittiwattanawong Kongkiat、Arai Nobuaki、Mitamura Hiromichi
  • Journal Title: Acoustics Australia Volume: 45 Issue: 2 Pages: 243-251
  • DOI: 10.1007/s40857-017-0094-7
• [Journal Article] Evaluation of multipath effects on depth measurements provided by acoustic transmitters in shallow water (2017)
  • Author(s): JUNICHI TAKAGI, KOTARO ICHIKAWA, NOBUAKI ARAI, YOSHINORI MIYAMOTO, KEIICHI UCHIDA, KO FUJIOKA, HIROMU FUKUDA & HIROMICHI MITAMURA
  • Journal Title: Proceedings of the 6th International Symposium on SEASTAR2000 and Asian Bio-logging Science Volume: 印刷中
  • NAID: 120006654117
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] The influence of body size on the intermittent locomotion of a pelagic schooling fish (2016)
  • Author(s): Takuji Noda, Ko Fujioka, Hiromu Fukuda, Hiromichi Mitamura, Kotaro Ichikawa, Nobuaki Arai
  • Journal Title: Proceedings of the royal society B Volume: 283 Issue: 1832 Pages: 20153019-20153019
  • DOI: 10.1098/rspb.2015.3019
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Effects of environmental factors on vocalization pattern of dugongs revealed by generalized linear model (2016)
  • Author(s): Kotaro Tanaka, Kotaro Ichikawa, Hideaki Nishizawa, Kongkiat Kittiwattanawong, Nobuaki Arai & Hiromichi Mitamura,
  • Journal Title: Proceedings of Techno-Ocean2016 Volume: -
  • Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Simultaneous identification of multiple signals from phase modulation-coded transmitters for acoustic biotelemetry of fish school (2016)
  • Author(s): Junichi Takagi, Kotaro Ichikawa, Nobuaki Arai, Yoshinori Miyamoto, Keiichi Uchida, Ko Fujioka, Hiromu Fukuda, Jun Shoji, Hiromichi Mitamura
  • Journal Title: Journal of Advanced Marine Science and Technology Society Volume: 22 Pages: 5-9
  • NAID: 130007040442
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] バイオロギングによる水圏生物の行動情報の取得―2 ジュゴン鳴音の時間周波数情報による分類と個体群間比較 (2020)
  • Author(s): 小泉慶次朗・市川光太郎・田中広太郎・Louisa Ponnampalam・Kongkiat Kittiwattanawong・荒井修亮・三田村啓理
  • Organizer: 令和2年度日本水産学会春季大会
• [Presentation] バイオロギングによる水圏生物の行動情報の取得―3 タイ国タリボン島周辺におけるジュゴンの発声行動の時空間パターン (2020)
  • Author(s): 田中広太郎・市川光太郎・荒井修亮・Kongkiat Kittiwattanawong・三田村啓理
  • Organizer: 令和2年度日本水産学会春季大会
• [Presentation] タイ国タリボン島の潮下帯海草藻場におけるジュゴンの摂餌タイミングの解明 (2020)
  • Author(s): 西山啓太・市川光太郎・田中広太郎・Kongkiat Kittiwattanawong・荒井修亮
  • Organizer: 令和2年度日本水産学会春季大会
• [Presentation] 潮間帯藻場におけるジュゴンの摂餌痕の自動検出技術の開発 (2020)
  • Author(s): 倭 千晶・市川光太郎・田中広太郎・西山啓太・荒井修亮・Kongkiat Kittiwattanawong・三田村啓理
  • Organizer: 令和2年度日本水産学会春季大会
• [Presentation] Acoustic surveys of dugongs (2019)
  • Author(s): Kotaro Ichikawa
  • Organizer: KU-KUGSA Bilateral Symposium
  • Int'l Joint Research / Invited
• [Presentation] Variances in contour patterns of dugong (Dugong dugon) chirps suggest individual signature (2019)
  • Author(s): Kotaro Ichikawa, Louisa S. Ponnampalam, Kee Alfian, Kongkiat Kittiwattanawong & Nobuaki Arai
  • Organizer: World Marine Mammal Conference
  • Int'l Joint Research
• [Presentation] Sound”scape”: An acoustical habitat map as a spatial distribution of marine soundscape (2019)
  • Author(s): Kotaro Ichikawa, Louisa Ponnampalam, Kee Alfian, Kotaro Tanaka, Nobuaki Arai
  • Organizer: 2019 INTERNATIONAL WORKSHOP ON MARINE SOUNDSCAPE
  • Int'l Joint Research / Invited
• [Presentation] Differences of temporal variation of snapping shrimp sounds in warm coastal sea (2019)
  • Author(s): Kotaro Tanaka, Louisa S. Ponnampalam, Kee Alfian, Kotaro Ichikawa, Hiromichi Mitamura, Nobuaki Arai
  • Organizer: 2019 INTERNATIONAL WORKSHOP ON MARINE SOUNDSCAPE
  • Int'l Joint Research / Invited
• [Presentation] Web操業日誌を用いたタイ国ジュゴン保護区における漁民の海域利用実態解明の試み ～小規模イカ釣り漁民の事例報告から～ (2019)
  • Author(s): 阿部朱音・秋道智彌・市川光太郎・荒井修亮・守屋和幸・Kongkiat Kittiwattanawong
  • Organizer: 平成31年度日本水産学会春季大会
• [Presentation] Acoustic monitoring of feeding behavior of dugongs (Dugong dugon) (2018)
  • Author(s): Kotaro Ichikawa, Kotaro Tanaka, Kongkiat Kittiwattanawong and Nobuaki Arai
  • Organizer: the 2nd Oceanoise Asia Symposium
  • Int'l Joint Research
• [Presentation] Soundscape changes in the dugong habitat (2018)
  • Author(s): Yuma Kugai, Kotaro Ichikawa, Nobuaki Arai, Kotaro Tanaka
  • Organizer: the 2nd Oceanoise Asia Symposium
  • Int'l Joint Research
• [Presentation] Preliminary study on automated detection of dugong feeding sounds (2018)
  • Author(s): Kotaro Tanaka,Kotaro Ichikawa, Louisa Ponnampalam, Kee Alfian, Heng Wei Khang, Nobuaki Arai, Hiromichi Mitamura
  • Organizer: the 2nd Oceanoise Asia Symposium
  • Int'l Joint Research
• [Presentation] Categorization and inter-regional comparison of dugongs’ vocalization (2018)
  • Author(s): Keiya Uehara, Kotaro Ichikawa and Nobuaki Arai
  • Organizer: the 2nd Oceanoise Asia Symposium
  • Int'l Joint Research
• [Presentation] ジュゴンの民族分類と伝統的な利用法～インド洋・太平洋における事例から～ (2018)
  • Author(s): 阿部朱音・秋道智彌・市川光太郎・荒井修亮
  • Organizer: 生き物文化誌学会 第 16 回学術大会
• [Presentation] マレーシア・ジョホール州シブ島およびティンギ島沿岸域における受動的音響観察を用いたジュゴンの摂餌音の検出 (2018)
  • Author(s): 田中広太郎・市川光太郎・Louisa Ponnampalam・Kee Alfian・Heng Wei Khang・Ng Jol Ern・荒井修亮・三田村啓理
  • Organizer: 平成30 年度日本水産学会春季大会
• [Presentation] 持続時間と周波数変調パターンによるジュゴン鳴音の分類と地域間比較 (2018)
  • Author(s): 上原慧哉・市川光太郎・荒井修亮
  • Organizer: 平成30 年度日本水産学会春季大会
• [Presentation] Investigation of fishing conditions and human-dugong relations in an Islamic fishing village in the southern Thailand (2018)
  • Author(s): Akane Abe, Kotaro Ichikawa, Kongkiat Kittiwattanawong, Nobuaki Arai
  • Organizer: INTERNATIONAL MERMAID SYMPOSIUM, 2nd Toba Symposium of Dugongs ― 30th Anniversary of SERENA ―
  • Int'l Joint Research
• [Presentation] The Dugong Acoustics around the World (2018)
  • Author(s): Kotaro Ichikawa
  • Organizer: INTERNATIONAL MERMAID SYMPOSIUM, 2nd Toba Symposium of Dugongs ― 30th Anniversary of SERENA ―
  • Int'l Joint Research / Invited
• [Presentation] Vocal Behavior of Serena (2018)
  • Author(s): Kotaro Ichikawa, Yuuki Matsuo
  • Organizer: INTERNATIONAL MERMAID SYMPOSIUM, 2nd Toba Symposium of Dugongs ― 30th Anniversary of SERENA ―
  • Int'l Joint Research / Invited
• [Presentation] Soundscape changes in the dugong habitat around Talibong Island of Thailand (2018)
  • Author(s): Yuma Kugai, Kotaro Ichikawa, Nobuaki Arai, Kotaro Tanaka, Kongkiat Kittiwattanawong
  • Organizer: INTERNATIONAL MERMAID SYMPOSIUM, 2nd Toba Symposium of Dugongs ― 30th Anniversary of SERENA ―
  • Int'l Joint Research
• [Presentation] Detection of dugong feeding events by passive acoustic monitoring in Sibu-Tinggi Islands, Johor, Malaysia (2018)
  • Author(s): Kotaro Tanaka, Kotaro Ichikawa, Louisa Ponnampalam, Kee Alfian, Heng Wei Khang, Ng Jol Ern, Nobuaki Arai
  • Organizer: INTERNATIONAL MERMAID SYMPOSIUM, 2nd Toba Symposium of Dugongs ― 30th Anniversary of SERENA ―
  • Int'l Joint Research
• [Presentation] Seasonal and individual differences of movement patterns of dugongs in Okinawa, Japan (2018)
  • Author(s): Keiya Uehara, Kotaro Ichikawa, Nobuaki Arai
  • Organizer: INTERNATIONAL MERMAID SYMPOSIUM, 2nd Toba Symposium of Dugongs ― 30th Anniversary of SERENA ―
  • Int'l Joint Research
• [Presentation] ジュゴンの生態学と人文学2 機械学習によるジュゴン鳴音と狭帯域ノイズの識別手法の確立 (2017)
  • Author(s): 田中広太郎、市川光太郎、上原慧也、荒井修亮、Kongkiat Kittiwattanabong、 三田村啓理
  • Organizer: 平成29年度日本水産学会春季大会
  • Place of Presentation: 東京海洋大学品川キャンパス
  • Year and Date: 2017-03-26
• [Presentation] ジュゴンの生態学と人文学 3 タイ国タリボン島のジュゴン生息海域におけるサウンドスケープの変動 (2017)
  • Author(s): 久貝悠真、市川光太郎、荒井修亮、Kongkiat Kittiwattanabong、田中広太郎、三田村啓理
  • Organizer: 平成29年度日本水産学会春季大会
  • Place of Presentation: 東京海洋大学品川キャンパス
  • Year and Date: 2017-03-26
• [Presentation] オーストラリア・トレス海峡諸島木曜島住民の生活とジュゴン (2017)
  • Author(s): 阿部朱音、市川光太郎、荒井修亮
  • Organizer: 平成29年度日本水産学会春季大会
  • Place of Presentation: 東京海洋大学品川キャンパス
  • Year and Date: 2017-03-26
• [Presentation] Inter-individual communication biotelemetry system (2017)
  • Author(s): Mitamura H, Arai N, Ichikawa K, Miyamoto Y, Uchida K, Kitagawa T, Fukuda H, Fujioka K, Miyashita K
  • Organizer: the 4th International Conference on Fish Telemetry
  • Int'l Joint Research
• [Presentation] Discrimination of dugong calls and tonal noise by machine learning (2017)
  • Author(s): Kotaro Tanaka, Kotaro Ichikawa, Nobuaki Arai, Kongkiat Kittiwattanawong & Hiromichi Mitamura
  • Organizer: the 22nd Biennial Conference on the Biology of Marine Mammals
  • Int'l Joint Research
• [Presentation] Improvement of automatic detection for dugong calls by machine learning (2017)
  • Author(s): Kotaro Tanaka, Kotaro Ichikawa, Nobuaki Arai, Kongkiat Kittiwattanawong, Hiromichi Mitamura
  • Organizer: The 6th International Seminar on Biodiversity and Evolution: Wildlife Science by New Biologging studies
  • Int'l Joint Research
• [Presentation] 沖縄近海のジュゴンの分布、移動速度および行動圏の個体間比較と季節変動 (2017)
  • Author(s): 上原慧哉・荒井修亮・市川光太郎
  • Organizer: 海洋理工学会平成 29 年度 春季大会
• [Presentation] Development of automatic discrimination method for dugong calls and tonal noise by machine learning (2016)
  • Author(s): Kotaro Tanaka, Kotaro Ichikawa, Nobuaki Arai, Kongkiat Kittiwattanawong & Hiromichi Mitamura
  • Organizer: The 5th Design Symposium on Conservation of Ecosystem (SEASTAR2000)
  • Place of Presentation: Kyoto, Japan
  • Year and Date: 2016-12-21
  • Int'l Joint Research
• [Presentation] Seasonal and individual differences of movement patterns of dugongs in Okinawa, Japan (2016)
  • Author(s): Keiya Uehara, Kotaro Ichikawa & Nobuaki Arai
  • Organizer: The 5th Design Symposium on Conservation of Ecosystem (SEASTAR2000)
  • Place of Presentation: Kyoto, University
  • Year and Date: 2016-12-21
  • Int'l Joint Research
• [Presentation] Evaluating accuracy of estimated distance among moving transmitters for fish school monitoring (2016)
  • Author(s): Junichi Takagi, Kotaro Ichikawa, Nobuaki Arai, Yoshinori Miyamoto, Keiichi Uchida, Ko Fujioka, Hiromu Fukuda & Hiromichi Mitamura
  • Organizer: The 5th Design Symposium on Conservation of Ecosystem (SEASTAR2000)
  • Place of Presentation: Kyoto University
  • Year and Date: 2016-12-21
  • Int'l Joint Research
• [Presentation] Vocal response of dugongs (Dugong dugon) to playbacks of conspecific calls suggest ranging function of chirps (2016)
  • Author(s): Kotaro Ichikawa, Nobuaki Arai, Kongkiat Kittiwattanawong
  • Organizer: 5th Joint Meeting of the Acoustical Society of America and the Acoustical Society of Japan
  • Place of Presentation: Honolulu, Hawaii
  • Year and Date: 2016-11-27
  • Int'l Joint Research / Invited
• [Presentation] Effects of environmental factors on vocalization pattern of dugongs revealed by generalized linear model (2016)
  • Author(s): Kotaro Tanaka, Kotaro Ichikawa, Hideaki Nishizawa, Kongkiat Kittiwattanawong, Nobuaki Arai & Hiromichi Mitamura
  • Organizer: Techno-Ocean2016
  • Place of Presentation: Kobe, Japan
  • Year and Date: 2016-10-06
  • Int'l Joint Research
• [Presentation] Orientation on capture operations and research goals (2016)
  • Author(s): Kotaro Ichikawa
  • Organizer: Health Assessment for Marine Endangered Species
  • Place of Presentation: Trang, Thailand
  • Year and Date: 2016-06-23
  • Invited
• [Presentation] Stroke patterns of a dugong revealed by using acoustic biologging (2016)
  • Author(s): Kotaro Ichikawa, Badr Eldinn Khalf alla Adm, Nobuaki Arai, Abdelmoneim Karamalla Gaiballa, & Hiroshi Nawata
  • Organizer: The 5th International Seminar on Biodiversity and Evolution: New Methodology for Wildlife Science
  • Place of Presentation: Kyoto University
  • Year and Date: 2016-06-07
  • Int'l Joint Research / Invited
• [Presentation] Nocturnal activity patterns of the Japanese eel Anguilla japonica by using ultrasonic telemetry (2016)
  • Author(s): Kotaro Ichikawa, Hiromichi Mitamura, Nobuaki Arai, Kenta Serizawa, Shun Watanabe, Katsumi Tsukamoto
  • Organizer: 21st symposium 2016, International Symposium on Biotelemetry
  • Place of Presentation: Leuven, Belgium
  • Year and Date: 2016-05-22
  • Int'l Joint Research
• [Presentation] Studies on Habitat use of Dugongs by Using Acoustic Biologging (2016)
  • Author(s): Kotaro Ichikawa
  • Organizer: National Symposium of Dugong and Seagrass in Indonesia 2016
  • Place of Presentation: Bogor, Indonesia
  • Year and Date: 2016-04-20
  • Int'l Joint Research / Invited
• [Book] ジュゴンの鳴音（生き物と音の事典） (2019)
  • Author(s): 市川光太郎・菊池夢美（生物音響学会編）
  • Total Pages: 464
  • Publisher: 朝倉書店
  • ISBN: 9784254171679
• [Book] マナティーの鳴音（生き物と音の事典） (2019)
  • Author(s): 菊池夢美・菊池夢美（生物音響学会編）
  • Total Pages: 464
  • Publisher: 朝倉書店
  • ISBN: 9784254171679
• [Book] 水中生物音響学 : 声で探る行動と生態 (2019)
  • Author(s): 赤松友成、木村里子、市川光太郎
  • Total Pages: 192
  • Publisher: コロナ社
  • ISBN: 9784339013405
• [Remarks] 第2回海牛祭り~海牛類＆鯨類~
  • URL: https://www.manateelab.jp/blank-28
• [Remarks] 生き物と音の事典
  • URL: http://www.asakura.co.jp/books/isbn/978-4-254-17167-9/