Climate change and dams as threats to the World Heritage Shiretoko: response by coldwater salmonid fish and a possible conservation plan

• Project/Area Number: 25281055
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Environmental and ecological symbiosis
• Research Institution: The University of Tokushima
• Principal Investigator: KAWAGUCHI Yoichi 徳島大学, ソシオテクノサイエンス研究部, 准教授 (20391617)
• Co-Investigator(Kenkyū-buntansha): TANIGUCHI Yoshinori 名城大学, 理工学部, 准教授 (30316145) ; URABE Hirokazu 地方独立行政法人北海道総合研究機構, さけます・内水面水産試験場, 研究主任 (30442669) ; SEKIJIMA Tsuneo 新潟大学, 自然科学系, 准教授 (10300964) ; SUMI Tetsuya 大同大学, 工学部, 准教授 (50303673)
• Co-Investigator(Renkei-kenkyūsha): KISHI Daisuke 岐阜県河川環境研究所, 下呂支所, 主任研究員 (80455526)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥18,200,000 (Direct Cost: ¥14,000,000、Indirect Cost: ¥4,200,000); Fiscal Year 2015: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2014: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2013: ¥9,880,000 (Direct Cost: ¥7,600,000、Indirect Cost: ¥2,280,000)
• Keywords: 温暖化 / 温度ストレス / ヒートショック蛋白 / オショロコマ / 砂防・治山ダム / スリットダム / 保全

Outline of Final Research Achievements

In the west coast of Shiretoko Peninsula, the water depth was shallow, velocity was low, and sunlight penetrated into the stream bed, all of which resulted in increasing the water temperature up to 25℃ in summer where dams were built densely along the stream course. The density of Dolly Varden in such a stream was low, and the fry was not confirmed.
Laboratory experiments showed that the Dolly Varden fries foraged less above 22℃, and they died at 26℃. Other experiments to clarify a defensive response of Dolly Varden to heat stress, the expression of
Hsp (heat-shock protein) 60s and 70 rose above 16℃. Field survey showed that the weight of ovaries were smaller as the expression of Hsp60 and 60s increased, and that the population density was low in the stream where the expression of Hsp60s and 70 was high. Thus, Hsp was shown to be an effective molecular index to detect the heat stress.

Research Products

• [Journal Article] Thermal Habitat Degradation of Dolly Varden in the Shiretoko Peninsula, Hokkaido, Japan (2015)
  • Author(s): Taniguchi, Y., Y. Kawaguchi, Y. Takegawa, H. Urabe, K. Shimoda, D. Kishi, T. Sumi, T. Sekijima
  • Journal Title: Bulletin of the Faculty of Science and Technology, Meijo University Volume: 20
  • NAID: 40020591405
  • Acknowledgement Compliant
• [Presentation] 砂防・治山ダムによる物理環境の改変が魚類・底生動物・藻類群集に及ぼす影響 -人為的改変はトロフィックカスケードを引き起こすのか？- (2016)
  • Author(s): 竹川有哉・河口洋一・布川雅典・岸大弼・谷口義則
  • Organizer: 日本生態学会第63回全国大会
  • Place of Presentation: 仙台国際センター（宮城県仙台市）
  • Year and Date: 2016-03-20
• [Presentation] 熱ショックタンパク質(Hsp)を指標としてオショロコマ個体群に対する河川水温上昇の影響を評価する (2016)
  • Author(s): 倉橋彩百合・鎌田泰斗・関島恒夫・竹川有哉・谷口義則・河口洋一
  • Organizer: 日本生態学会第63回全国大会
  • Place of Presentation: 仙台国際センター（宮城県仙台市）
  • Year and Date: 2016-03-20
• [Presentation] サケ科魚類オショロコマに対するダム設置による水温上昇の影響を熱ショックタンパク質(Hsp) で評価する (2015)
  • Author(s): 倉橋彩百合・鎌田泰斗・関島恒夫・竹川有哉・谷口義則・河口洋一
  • Organizer: 応用生態工学会 第19回郡山大会
  • Place of Presentation: 日本大学工学部キャンパス 70号館（福島県郡山市）
  • Year and Date: 2015-09-10
• [Presentation] Relation density of Dolly Varden and environmental factors in the Shiretoko Peninsula: Effects of Global Warming and Dams (2015)
  • Author(s): Takegawa Y., Kawaguchi Y., Taniguchi Y., Urabe H., & Shimoda K.
  • Organizer: The Vth International Wildlife Management Congress
  • Place of Presentation: 札幌コンベンションセンター（北海道札幌市）
  • Year and Date: 2015-07-26
  • Int'l Joint Research
• [Presentation] The effect of low-head dams on jaw morphology of Dolly Varden (Salvelinus malma) in mountain streams of the Shiretoko Peninsula, Hokkaido, Japan (2015)
  • Author(s): Kawaguchi Y., Saito M., Takegawa Y., & Taniguchi Y.
  • Organizer: 8TH INTERNATIONAL CHARR SYMPOSIUM
  • Place of Presentation: TROMSO, NORWAY
  • Year and Date: 2015-06-14
  • Int'l Joint Research
• [Presentation] Thermal responses of Dolly Varden to Temperature Warming: Implications for Global Climate Change (2015)
  • Author(s): Taniguchi Y., Kawaguchi Y., Takegawa Y., Urabe H., & Shimoda K.
  • Organizer: 8TH INTERNATIONAL CHARR SYMPOSIUM
  • Place of Presentation: TROMSO, NORWAY
  • Year and Date: 2015-06-14
  • Int'l Joint Research
• [Presentation] Assessing the conservation plan under global warming for Dolly Varden (Salvelinus malma) by using species distribution models in Hokkaido, Japan (2015)
  • Author(s): Takegawa Y., Kawaguchi Y., & Taniguchi Y.
  • Organizer: 8TH INTERNATIONAL CHARR SYMPOSIUM
  • Place of Presentation: TROMSO, NORWAY
  • Year and Date: 2015-06-14
  • Int'l Joint Research
• [Presentation] IMPACTS OF CLIMATIC WARMING ON DOLLY VARDEN (SALVELINUS MALMA) ACCELERATED BY LOW-HEAD DAMS IN JAPAN (2014)
  • Author(s): Kawaguchi, Y., Y. Taniguchi, Y. Takegawa, S. Kurahashi, Y. Kamada, T. Sekijima, H. Urabe, and K. Shimoda.
  • Organizer: 2014 Ecological and Evolutionary Ethology of Fishes
  • Place of Presentation: オレゴン州立大学(USA)
  • Year and Date: 2014-06-22 – 2014-06-23
• [Presentation] 河川工作物は温暖化に伴う水温上昇を加速させるのか？ - 知床におけるオショロコマ密度と物理環境要因の関係- (2014)
  • Author(s): 竹川有哉・河口洋一・谷口義則・岸大弼・卜部浩一・下田和孝
  • Organizer: 日本生態学会第61回全国大会（広島）
  • Place of Presentation: 広島国際会議場（広島県）
• [Presentation] Thermal responses of juvenile stream fish to temperature warming: implications for global climate change
  • Author(s): Taniguchi, Y., Y. Kawaguchi, Y. Takegawa, H. Urabe, and K. Shimoda.
  • Organizer: 2013 3rd International Conference on Environmental Science and Biotechnology
  • Place of Presentation: Hoteu Royal Kuala Lumpur（クアラルンプール，マレーシア）