Elucidating mechanisms driving regional aquatic diversity in landscapes consisting of natural rivers, agricultural drainage channels, and spring-fed creeks

• Project/Area Number: 24710269
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Resource conservation science
• Research Institution: Hokkaido University
• Principal Investigator: NEGISHI Junjiro 北海道大学, 地球環境科学研究科(研究院), 准教授 (90423029)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2014: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000); Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2012: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
• Keywords: 景観 / 農地 / 河川 / 生物多様性 / 湧水 / 保全優先度 / 水生生物 / 河川管理 / 地下水 / 水温 / 羽化フェノロジー / 保全 / 生態系管理

Outline of Final Research Achievements

Fist, endangered unionoid mussels were found more in the drainage channel that had a high connectivity to the downstream rivers, and fish community with high taxonomic diversity co-occurred. Also, landscape surrounded by low levels of urbanization characterized their habitat. Second, macrophyte diversity in floodplain lakes were positively correlated with their cover area, and the quality of macrophyte habitat was the lowest in the artificially created oxbow lakes. Third, spring-fed rivers harbored unique sets of species of aquatic insects, thereby contributing to the taxonomic diversity at the watershed scale. These suggest that systematic classifications of habitat across landscapes based on landform and groundwater would facilitate efficient conservation of aquatic biodiversity.

Research Products

• [Journal Article] Geomorphic legacy controls macrophyte distribution within and across disconnected floodplain lakes. (2014)
  • Author(s): Negishi, J. N., Soga, M., Ishiyama, N., Suzuki, N., Yuta, T., Sueyoshi, M., ... & Yoshimura, N.
  • Journal Title: Freshwater Biology Volume: 59(5) Issue: 5 Pages: 942-954
  • DOI: 10.1111/fwb.12317
  • Peer Reviewed
• [Journal Article] Imperiled freshwater mussels in drainage channels associated with rare agricultural landscape and diverse fish communities (2014)
  • Author(s): Negishi JN, Tamaoki H, Watanabe N, Nagayama S, Kume M, Kayaba Y, Kawase M
  • Journal Title: limnology Volume: to be decided
  • Peer Reviewed
• [Journal Article] Interaction between patch area and shape: lakes with different formation processes have contrasting area and shape effects on macrophyte diversity (2013)
  • Author(s): Soga M, Ishiyama N, Sueyoshi M, Yamaura Y, Hayashida K, Koizumi I & Negishi JN
  • Journal Title: Landscape and Ecological Engineering Volume: 未定 Issue: 3 Pages: 270-278
  • DOI: 10.1007/s10310-012-0349-y
  • Peer Reviewed
• [Presentation] 陸域への資源パルスの時空間変異：河川羽化昆虫量および群集構造における河川・生息場タイプの影響 (2015)
  • Author(s): 根岸淳二郎他
  • Organizer: 第62回日本生態学会
  • Place of Presentation: 鹿児島
  • Year and Date: 2015-03-22
• [Presentation] Green Riverine Landscape Is Not Always a Sign of High Conservation Value: Human-altered Channel Morphology, River-floodplain Interactions, In-stream Habitat Condition, and Recreational Values. (2014)
  • Author(s): Junjiro Negishi et al.
  • Organizer: AOGS 2014
  • Place of Presentation: sapporo
  • Year and Date: 2014-08-01
• [Presentation] The Importance of Heterogeneity of Hydrological Processes for Aquatic Biodiversity at the Landscape Scale (2014)
  • Author(s): Nozomi Watanabe et al.
  • Organizer: AOGS 2014
  • Place of Presentation: sapporo
  • Year and Date: 2014-07-28
• [Presentation] 流域スケールにおけるβ多様性維持機構の解明‐水生昆虫群集と湧水河川に着目して
  • Author(s): 渡辺のぞみ、根岸淳二郎、布川雅典
  • Organizer: 応用生態工学会
  • Place of Presentation: 東京農業大学（東京都）