| 研究課題/領域番号 |
19H04314
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| 研究機関 | 北海道大学 |
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研究代表者 |
G・MOLINOS JORGE 北海道大学, 北極域研究センター, 准教授 (30767281)
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| 研究分担者 |
石山 信雄 地方独立行政法人北海道立総合研究機構, 森林研究本部 林業試験場, 研究主任 (50780821)
末吉 正尚 国立研究開発法人土木研究所, 土木研究所(つくば中央研究所), 専門研究員 (70792927)
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| 研究期間 (年度) |
2019-04-01 – 2024-03-31
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| キーワード | 気候変動 / 河川生態系 / 水温予測 / 種間関係 / メソコスム実験 |
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| 研究実績の概要 |
Three of the four study catchments could be visited to retrieve temperature data from the first year, conduct maintenance, and sample biological parameters at multiple sites (fish: 27 sites sampled, macroinvertebrates: 22 sites, benthic algae: 70 sites).
Initial data analysis between temperature data and environmental predictors showed water temperature regimes in volcanic mountain streams had average summer temperatures ~3°C lower than non-volcanic streams at similar altitudinal and air temperature ranges. They also had higher abundances of Cottus nozawae, a cold-adapted fish. These results highlight the important role of volcanic geology in providing thermal refugia for sensitive biota under climate change. Presented at ESJ annual meeting.
The project also engaged in international collaboration:
(i) An experiment conducted in the Hokkaido University Tomakomai Experimental Forest with researchers from Trinity College (Ireland) showed that heatwaves destabilised benthic stream communities by homogenising them in space but only when fish predators were absent, highlighting the potential for species extinctions to amplify the effects of climate change and extreme events. Presented at ESJ annual meeting.
(ii) An experiment lead by researchers from the Institute of Hydrobiology of the Chinese Academy of Sciences (published Env Int IF9.62 and MethodsX IF1.84) evidenced complex interactions of warming and nutrient enrichment in altering growth and phenology of Potamogeton crispus, a widespread freshwater macrophyte common in Japan.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
Persistent COVID-19 restrictions experienced over the field season caused inevitable delays and cancellations of the planned field work. As a result, access to the fourth catchment (Hiji River) was impossible this year and the planned biological sampling could not be completed in the other river catchments. These pending tasks have been carried over into FY2021. Preliminary statistical models for prediction of water temperatures were tested this year but further refinement of the models and their coupling with biological data will need to wait until all catchments can be visited and the temperature and biological data collection is completed.
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| 今後の研究の推進方策 |
Altogether, despite the current delays caused to the original implementation plan, the project is still in course to meet its objectives. FY2021 will carry on with the collection of temperature data and completion of the remaining biological sampling, including that carried over from FY2020. Statistical models for prediction of water temperatures will be further refined with the new data collected and combined with biological data to assess relationships between water temperatures and the distribution and composition of aquatic species. However, further adjustments might be required if the disruptions caused by COVID-19 continues throughout FY2021, which may lead to changes in the objectives and deliverables. As a contingency measure, the project will continue to engage in international collaborations to provide alternative routes for meeting project objectives.
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