Development of forecasting method for schooling marine mammals

• Project/Area Number: 15K20828
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Environmental and ecological symbiosis; Aquatic bioproduction science
• Research Institution: Hokkaido University
• Principal Investigator: MITANI Yoko 北海道大学, 北方生物圏フィールド科学センター, 准教授 (40538279)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2015: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
• Keywords: 海棲哺乳類 / 回遊 / 海洋環境

Outline of Final Research Achievements

Schooling marine mammals has a heavily impact on the ecosystems by consuming vast quantities of fish resources. In this study, we investigated the relationship between the seasonal change of the distribution of Pacific white-sided dolphins and the marine environment, and clarified the parameters that influence the distribution and migration. Stable isotope analyses showed that they feed on sardines and squids. Interview surveys revealed that the dolphins and fisheries conflicts occur on the Sea of Japan side of Aomori and Oshima Peninsula. Location data obtained from ship-based sighting survey and satellite tracking showed that sea surface temperature, water depth and distance from land influence the distribution of dolphins at large scale.

Research Products

• [Journal Article] Estimation of Environmental Factors that Influence the Migration Timing and Distribution of Pacific White-sided Dolphins around Hokkaido, Japan. (2017)
  • Author(s): Yuka Iwahara, Yoko Mitani, Kazushi Miyashita
  • Journal Title: Pacific Science Volume: 印刷中
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] 北海道東部海域におけるシャチの分布と生息環境 (2017)
  • Author(s): 宮本春奈・岩原由佳・幅祥太・中原史生・大泉宏・斎野重夫・山本友紀子・吉岡基・三谷曜子
  • Journal Title: 知床博物館研究報告 Volume: 39 Pages: 37-48
• [Journal Article] 海棲哺乳類の保全・管理のための調査・解析手法(3)バイオテレメトリ・バイオロギング． (2016)
  • Author(s): 南川真吾，村瀬弘人，三谷曜子．
  • Journal Title: 海洋と生物 Volume: 38(4) Pages: 425-434
  • NAID: 40020942523
• [Journal Article] Spatial association between northern fur seal (Callorhinus ursinus) and potential prey distribution during wintering period in the northern Sea of Japan. (2016)
  • Author(s): Takanori Horiomto, Yoko Mitani, Yasunori Sakurai
  • Journal Title: Fisheries Oceanography Volume: 25 Issue: 1 Pages: 44-53
  • DOI: 10.1111/fog.12133
  • Peer Reviewed
• [Journal Article] 船による北海道の海棲哺乳類目視調査 (2015)
  • Author(s): 三谷曜子
  • Journal Title: 勇魚 Volume: 62 Pages: 11-14
• [Presentation] 日本周辺海域におけるカマイルカの潜水行動の日周変化 (2017)
  • Author(s): 石井 緑・南川真吾・ 白川北斗・三谷曜子
  • 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（東京都港区）
  • Year and Date: 2017-03-27
• [Presentation] カマイルカってどんなイルカ？ (2017)
  • Author(s): 三谷曜子
  • Organizer: むつわんのイルカシンポジウム
  • Place of Presentation: プラザホテルむつ（青森県むつ市）
  • Year and Date: 2017-03-11
  • Invited
• [Presentation] Spatial distribution factors of Pacific white-sided dolphins around northern Japan. (2015)
  • Author(s): Yuka Iwahara, Shingo Minamikawa, Kazushi Miyashita and Yoko Mitani
  • Organizer: 21st Biennial Conference on the Biology of Marine Mammals
  • Place of Presentation: The Hilton San Francisco, San Francisco（アメリカ）
  • Year and Date: 2015-12-17
  • Int'l Joint Research
• [Presentation] Foraging Distribution of Pacific White-Sided Dolphin, Dall’S Porpoise and Harbor Porpoise around Hokkaido, Japan. (2015)
  • Author(s): Yuka Iwahara, Hokuto Shirakawa, Kazushi Miyashita, Yoko Mitani
  • Organizer: Vth International Wildlife Management Congress 2015
  • Place of Presentation: Sapporo Convention Center（北海道 札幌市）
  • Year and Date: 2015-07-30
  • Int'l Joint Research