2022 Fiscal Year Final Research Report
Investigation of the function of riverside vegetation in urban areas to biodiversity preservation
| Project/Area Number |
19K06103
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 39070:Landscape science-related
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| Research Institution | Hokkaido University of Education |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2023-03-31
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| Keywords | 生態的回廊 / 河川植生 / 昆虫相 / 頸吻亜目 |
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| Outline of Final Research Achievements |
This study examines the taxonomic diversity and similarity of the insect fauna of the suborder Auchenorrhyncha （Hemiptera） inhabiting rivers of different sizes of riverine vegetation in Asahikawa, Hokkaido, Japan, and examines the ecological network of riverbeds in urban areas by studying how taxonomic diversity and similarity change from mountainous to urban areas. The results showed that the diversity of insect fauna is proportional to the size of riparian vegetation, and that above a certain size of riparian vegetation, species diversity can be maintained to some extent even in extremely urbanized riverine areas. It was also confirmed once again that core areas established at key points along ecological corridors play a significant role in maintaining biodiversity.
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| Free Research Field |
昆虫分類学
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| Academic Significance and Societal Importance of the Research Achievements |
河川敷の植生環境整備は，ヒトだけでなく生物全体へのメリットが伴うことを考慮しなければならない．しかし発達した河畔林は増水時の流水阻害等を引き起こすため，治水の面では弊害となり河川整備の際には伐採されることが多い．そのため開発に際しては，生物多様性の保持・分散機能に必要となる具体的な植生面積や種類を求めることができれば，生態的回廊効果への影響を判断して開発計画を検討できる．また，河川敷への単一の樹木や草本植物の移植が，農業・衛生害虫の温存地となり不自然な大量発生を招く可能性もあるため，植生の質と種構成の関連を明らかにすることでこのようなリスクを削減できる．
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