Toward the dissemination of sensitivity maps to prevent bird collisions

鳥衝突を未然に防ぐ脆弱性マップ(sensitivity map)の普及に向けて

The generation of wind power negatively impacts bird and bat species. Therefore, bird sensitivity maps are important tools for conserving biodiversity while promoting the development of renewable energy. This special issue was created in response to Symposium S03 (``Toward the Dissemination of Sensitivity Maps to Prevent Bird Collisions''), which was held at the 65th Annual Meeting of the Ecological Society of Japan in 2018. In this special issue, seven experts at the forefront of research on the environmental impacts of wind power on birds provide their perspectives on the utility and challenges of bird sensitivity mapping.

風力発電が生物多様性，特に鳥類やコウモリ類などの飛翔動物に負の影響をもたらすことが明らかになる中，温暖化対策を進めつつ生物多様性を保全するための情報の一つとして，鳥類センシティビティマップの重要性が高まっている．本特集号は，2018年日本生態学会第65回大会において，企画シンポジウムS03「鳥衝突を未然に防ぐセンシティビティマップの普及に向けて」が開催されたことを受け，特集号として企画された．本特集号では，鳥類に対する風力発電の環境影響に関し最前線で取り組む7人の識者が，鳥類のセンシティビティマップの有用性と課題について，それぞれの立場から解説する．

Japanese Journal of Conservation Ecology


Significance of small stream restoration and river network on freshwater fish diversity.

河川ネットワークを考慮した自然再生地の効果の検討:魚類多様性をケーススタディとして


徳島県那賀川のダム湖群に生息するアユの遺伝的多様性と由来

徳島県那賀川のダム湖群に生息するアユの遺伝的多様性と由来


北海道北部地域を対象としたオジロワシの営巣適地推定

北海道北部地域を対象としたオジロワシの営巣適地推定


徳島県鳴門市の蓮田におけるアメリカザリガニの生息環境解析

徳島県鳴門市の蓮田におけるアメリカザリガニの生息環境解析


Sensitivity maps and their application to minimise the impact of wind power facilities on birds

鳥類に対する風力発電施設の影響を未然に防ぐセンシティビティマップとその活用方法

The Japanese government has pledged to achieve carbon neutrality by 2050. To realise this goal, renewable solar, wind, hydro and geothermal power generation are now attracting attention. Wind power is expected to have great potential in Japan, and is likely to be promoted on land and sea areas. However, with the introduction of wind power generation throughout Japan, associated environmental conflicts are expected to increase. The main points of contention are noise, infrasound, landslides, water pollution, landscape aesthetics, the natural environment and birds, especially bird collisions and habitat abandonment caused by the construction of wind turbines in the habitat of rare birds of prey, such as the golden eagle Aquila chrysaetos, Hodgson's hawk eagle Nisaetus nipalensis and the white-tailed eagle Haliaeetus albicilla. Environmental conflicts are likely to increase as wind power projects are developed, to achieve the 2050 target. Therefore, the use of sensitivity maps should help prevent bird collisions and habitat abandonment. A sensitivity map shows where birds are likely to be negatively affected by the construction of wind power facilities, based on integrated information on the habitat of endangered bird species, migratory bird flyways, colony sites, overwintering areas, protected areas, etc. This review first explains the concept of a sensitivity map and describes its relation to environmental assessments. Then, we explain the features of various proposed sensitivity maps and discuss their appropriate resolution. Finally, we discuss the roles of sensitivity maps in future efforts to reconcile biodiversity conservation and the anticipated demand for renewable energy development, to attain the 2050 carbon-neutral target.

日本政府は， 2050年までにカーボンニュートラルの実現を目指すことを表明した．その実現に向けて，今，太陽光，風力，水力，地熱発電などのエネルギー源を利用した再生可能エネルギーが注目されている．その中でも風力発電については，北海道，東北，九州を中心に好風況地域が存在し将来的に高い導入ポテンシャルが期待されることから，今後，陸域および海域において大きく推進される可能性が高い．一方，風力発電の導入が全国各地で進むにつれて，計画段階における環境紛争も顕在化してきた．主たる紛争論点は，騒音・低周波音，土砂災害・水質汚濁，景観，自然，鳥類であり，特に鳥類については，オジロワシ Haliaeetus albicilla，クマタカ Nisaetus nipalensis，イヌワシ Aquila chrysaetosなど希少猛禽類の生息地における風車建設が鳥衝突や生息地放棄を引き起こす可能性が危惧され，紛争発生の大きな要因となっている． 2050年目標の達成に向けて，陸域および海域において，大規模な風力発電事業が全国的に展開されていくことになれば，環境紛争はより深刻化していく可能性も否めない．そこで，風力発電事業による環境影響を未然に防ぐために必要な情報を提供するのがセンシティビティマップである．センシティビティマップとは，重要な鳥類の生息分布や保護区等の情報に基づき，鳥類が風力発電の影響を受けやすい場所を示したマップのことを指す．本総説では，はじめに，センシティビティマップの概念を説明し，その活用手段として環境アセスメントとの関わりを述べる．続いて，これまでに提案されてきた様々なセンシティビティマップの特徴を紹介するとともに，その適切な空間解像度を考察する．最後に， 2050年カーボニュートラルの目標達成に向けた再生可能エネルギー推進の今後の取り組みにおいて，センシティビティマップが果たす役割について述べる．


徳島県鳴門市に造成されたビオトープとレンコン田におけるコウノトリの餌生物量調査

徳島県鳴門市に造成されたビオトープとレンコン田におけるコウノトリの餌生物量調査


Valuation of latent demand for ecotourism in Shiretoko using choice-based experiments - Latent class model to capture perference diversity -

選択型実験を用いた知床でのエコツーリズムにおける潜在需要の評価-潜在クラスモデルによる選好の多様性の把握-

日本都市計画学会学術研究論文集


At-Sea Habitat Use of Rhinoceros Auklets Breeding in the Shelf Region of Eastern Hokkaido


Reconciling biodiversity conservation and flood risk reduction: The new strategy for freshwater protected areas


Effects of sediment replenishment on riverbed environments and macroinvertebrate assemblages downstream of a dam

Riverbeds downstream of dams are starved of sediment, impacting habitat structure and ecological function. Despite the implementation of sediment management techniques, there has been no evaluation of their conservational effectiveness; the impacts on high trophic level organisms remain unknown. This study examined the effects of sediment replenishment on riverbeds and macroinvertebrates in a dammed river before and after sediment replenishment. We evaluated the particle sizes of replenished sediments and the case material of a case-bearing caddisfly. We observed significant changes in macroinvertebrate assemblages before and after sediment replenishment, and between the upstream and tributary references and downstream of the dam. The percentages of Ephemeroptera, Plecoptera, and Trichoptera, and the number of inorganic case-bearing caddisflies downstream of the dam following sediment replenishment, were significantly higher than the upstream and tributary reference sites. The particle size of case materials used by case-bearing caddisfly corresponded to the size of the replenished sediment. Dissimilarity results after replenishment showed that assemblages downstream of the dam differed from upstream sites, although they were similar to the tributary sites. The dissimilarity between the tributary and downstream of the dam was the same as that between the upstream and tributary. Sediment replenishment was observed to reduce the harmful effects of the dam, and partly restore benefits such as increasing species diversity and altering community assemblages, similar to the effects of tributary inflows.


Time Series Changes in Fish Assemblages and Habitat Structures Caused by Partial Check Dam Removal


Sensitivity mapping for seabirds and offshore wind power farms: A case study of Slaty-backed gulls in Hokkaido

北海道根室落石で繁殖するオオセグロカモメを対象とした洋上風力発電センシティビティマップ

Offshore wind energy is a renewable energy source that offers an opportunity to reduce greenhouse gas emissions while increasing energy security. However, many ecologists have suggested that offshore wind farms may have severe negative impacts on wildlife, especially seabirds. Thus, balancing seabird conservation with human energy demands is necessary when developing wind farms. Bird sensitivity mapping is a powerful and practical tool that can determine turbine collision risk within specific areas; however, sensitivity maps have seldom been generated for seabirds. Focusing on the Slaty-backed gull (Larus schistisagus), a red-listed species that often collides with wind turbines, we determined factors affecting habitat selection with the goal of reducing negative impacts of offshore wind farms. We then generated a sensitivity map using habitat modeling. GPS loggers set to record at 5-minute intervals between June and August 2018 were attached to six Slaty-backed gulls residing in Ochiishi Bay, Nemuro Prefecture, Japan. A Gaussian mixed model indicated that habitat selection was related to food availability (as determined by sea surface temperature and chlorophyll a content) and distance to the nest site. Sea surface temperature and chlorophyll a content were positively related area visitation frequency of Slaty-backed gulls, whereas distance to nest site was negatively correlated. Moreover, area visitation frequency was unchanged when the distance from the nest site was > 25 km. The sensitivity map indicated that areas both near and far from nest sites with potentially abundant food resources were high-risk areas with respect to turbine collisions for Slaty-backed gulls. Based on these results, we advocate the use of sensitivity mapping to reduce interactions between offshore wind farms and seabirds, especially for species that often forage far from their nest sites.

洋上風力発電は陸上風力発電よりも極めて大きな発電量を持つことから，近年気候変動問題の緩和策として最も有力視されている再生可能エネルギーのひとつである．その一方で，風車への海鳥の衝突等，野生動物への影響も懸念されている．このため，海鳥の生息に配慮した風力発電事業計画のための実用的なセンシティビティマップが求められるが，多くの国で作成されていない．本研究は，海鳥類への影響を最小限にとどめることを目的に，オオセグロカモメ Larus schistisagusをケーススタディとし，本種の生息場選択に関わる要因を明らかにし，センシティビティマップを作成した． 2018年 6-8月に，北海道道東地方に生息するオオセグロカモメ 6個体に GPSロガーを装着し 5分間隔で利用場所を特定した．オオセグロカモメの利用頻度は海水面温度，クロロフィル a，および営巣地からの距離が関係しており，海水面温度やクロロフィル aの上昇に伴い増加し，営巣地からの距離に応じて減少した．しかし，営巣地からの距離が 25 kmを越えた辺りからは横ばいとなった．これらの結果を用いてセンシティビティマップを作成したところ，営巣地に近接した海域だけでなく，遠方であっても潜在的に餌資源量が多い海域であれば，本種が風車に衝突する可能性が高くなることが示唆された．国内での洋上風力発電事業が計画されつつある今日では，本研究で示された手順で緊急にセンシティビティマップを作成し，事前の開発地選択に活用する必要がある．


中小河川の河道内氾濫と河川合流部の重要性

中小河川の河道内氾濫と河川合流部の重要性


水田への魚類の遡上を促す遡上版の開発

水田への魚類の遡上を促す遡上版の開発


Dietary Overlap But Spatial Gap between Sympatric Japanese Serow (Capricornis crispus) and Sika Deer (Cervus nippon) on Eastern Shikoku, Japan


MONITORING THE USE OF ARTIFICIAL SPAWNING GROUNDS FOR Plecoglossus altivelis altivelis AT THE NAHARI RIVER -FOCUSING ON THE COMPARISON BETWEEN VISUAL SURVEY AND ENVIRONMENTAL DNA ANALYSIS-

高知県奈半利川におけるアユ人工産卵場の利用状況モニタリング∼潜水目視調査と環境DNA分析の比較を中心に∼


Significance of the stable foundations provided and created by large wood for benthic fauna in the Shibetsu River, Japan


Species, sex, and individual identification of Japanese serow (Capricornis crispus) and sika deer (Cervus nippon) in sympatric region based on the fecal DNA samples


Implementing species distribution models to predict the impact of global warming on current and future potential habitats of white-spotted char (Salvelinus leucomaenis) for effective conservation planning in Japan

日本におけるイワナSalvelinus leucomaenisの生息適地推定と地球温暖化を考慮した保全計画への適用

Global warming is causing the distributions of many species to shift towards higher latitudes or altitudes. The white-spotted char (Salvelinus leucomaenis), a cold-water adapted stenothermal fish, is potentially vulnerable to ongoing climatic warming. We therefore evaluated the extent to which the areas protected by national parks cover current and future potential habitats of S. leucomaenis under various climate-warming scenarios. Species distribution models using MaxEnt predicted that catchment area, slope inclination, distance to the river mouth, and estimated ground water temperature were key factors for potential habitats of anadromous and landlocked populations, and that 28.4% of potential habitats would be lost with a 3°C increase in the annual average air temperature. Potential habitats at lower latitudes, in particular, are likely to be affected, and most river basin habitats would disappear if the average temperature were to increase by 2°C. Although potential habitats in higher latitudes are less vulnerable to climate warming, the current national park system would not be able to protect these refuges. There is thus an urgent need for the development of conservation measures to mitigate the potential impact of global warming on white-spotted char habitats.

地球温暖化によって多くの生物の分布が高緯度や高標高地域にシフトしている．日本に生息する狭冷水性のサケ科魚類であるイワナ<i>Salvelinus leucomaenis</i>は，気候変動の影響を受けやすいことが知られており，保全対策が必要である．本研究では，自然公園等の保護区の設定を想定したイワナの保全対策を検討するため，MaxEnt法を用いて，亜種を考慮したイワナの分布モデルの構築及び温暖化が進行した場合の生息適地を予測し，現在と将来の生息適地がどの程度保護区内に存在するのかを評価した．結果，回遊型イワナであるアメマスの生息適地モデルには，集水面積，海までの距離及び推定地下水温が，河川型イワナである本州イワナ(ニッコウイワナ，ヤマトイワナ，ゴギ)の生息適地モデルには推定地下水温と傾斜度がそれぞれ大きく寄与することが分かった．本州及び北海道のイワナ生息適地は，年平均気温が3℃上昇すると28.4%減少すると予測された．特に，中国地方や近畿地方などの低緯度地域における生息適地は減少し，2℃上昇するとほぼすべての流域で消失すると予測された．高緯度地域では，生息適地の減少率は小さかったが，保護区と重複する割合も小さいことが明らかになった．温暖化の影響を受けにくい生息適地はレフュージアになると考えられるが，その多くが保護区の外に存在していることから，保全対策の実行が急務である．

Japanese Journal of Conservation Ecology


ANALYSIS OF DENSITY DETERMINATE ENVIRONMENTAL FACTORS OF SEMISULCOSPIRA LIBERTINA, AND THEIR CORRELATION TO OBSERVED NUMBER OF GENJI FIREFLY (LUCIOLA CRUCIATA) IN KAWATA RIVER, MISATO, YOSHINOGAWA CITY, IN TOKUSHIMA PREFECTURE

吉野川市美郷川田川におけるカワニナの生息密度とホタルの飛翔数の関係

We examined relationship between environmental factors and the density of a fleshwater snail, Semisulcospira libertina, which is main prey of a Genji firefly (Luciola cruciata) lavae at seven stations in Kawata River, Misato, Tokushima Prefecture. Moreover, we examined correlation between fleshwater snail density and observed number of Genji firefly. The results showed that the density of fleshwater snail was high on lentic site and positively correlated with water depth and rock size, while negatively correlated with the current velocity. River characteristics such as lentic, deep, and rocky substrate might be suitable for fleshwater snail habitat. Estimated densities of S. libertina were strongly correlated with the observed numbers of adult Genji firefly. To conserve Genji firefly, conservation of river environments for fleshwater snail habitats are also required.

徳島県吉野川市の川田川において，カワニナの密度と河川環境要因の関係およびカワニナの推定密度とゲンジボタルの飛翔数の相関について解析を行った．カワニナの密度調査の結果，カワニナの密度はワンドにおいて高い傾向が見られ，カワニナ密度は水深と岩盤の存在に正の相関が見られ，底層流速に負の相関が見られた．このことから水深が深く，底層流速が遅く，河床に岩盤が多い環境がカワニナの生息適地であると示された．モデルを用いて推定したカワニナの密度は，ゲンジボタルの飛翔数と正の相関を示し，ホタルの保全にはカワニナが安定して生息できる環境を保全することが有効であると考えられる．

Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)

土木学会論文集G(環境)


Phylogeography of Opsariichthys platypus in Japan based on mitochondrial DNA sequences


Towards the use of National Census on River Environments data for conservation: issues and a case study

河川水辺の国勢調査を保全に活かす―データがもつ課題と研究例

With rapid declines in global riverine biodiversity, conservation is needed on a nationwide scale. Since 1990, the National Census on River Environments (NCRE) has collected meaningful data on riverine organisms and environments in Japan. However, there are several issues with using the NCRE database for scientific studies. In this study, we summarised issues related to the NCRE database, and used the 3rd NCRE dataset (2001-2005) to evaluate nationwide trends in species richness and the rarity of fishes (primarily freshwater and diadromous fishes) and taxon richness and the rarity of benthic animals (aquatic insects and shellfishes). First, we summarised data quality (e.g. monitoring sites and season) and data formatting issues (e.g. site name and species name). Second, we mitigated these potential issues as thoroughly as possible and tested the relationships of species (or taxon) richness and rarity with latitude using generalised linear models. We found that species and taxon richness showed different latitudinal distributions between primarily freshwater and diadromous fishes and between aquatic insects and shellfishes. In contrast, rarities showed spatial congruence with species diversity, suggesting that more species and rare species could be conserved in the same regions.

河川を含む淡水生態系の生物多様性は急速に低下しており，その効果的な保全のため，広域スケールでの生物多様性の現状評価と将来予測が求められている．1990年に開始された河川水辺の国勢調査(水国)は，日本で唯一の国土スケールでの河川環境に関する定量調査事業で，日本の河川生物の保全に対する重要性は今後さらに高まることが予想される．そこで本稿では，保全生態学的研究への水国データの効果的な活用を目指して，水国の概要とデータを利用する際に注意すべき課題について解説するとともに，データを活用した研究事例を紹介する．課題は，調査地点，時期といったデータの質に影響を及ぼす「調査手法」に関するものと，研究者がデータを利用する際に直面する「データ整備」に関するものに分けられた．研究事例では，2001年から2005年の水国3巡目で得られた魚類と底生動物のデータを利用した全国スケールの解析を行った．魚類は純淡水性と通し回遊性に分け，底生動物は，水生昆虫類と貝類に分けて種数または分類群数と希少性指標(レッドリストの各カテゴリーに掲載されている種数から算出)を算出し，それぞれの全国的な傾向を検証した．解析の結果，種数と分類群数の全国的な空間分布は，魚類の生活型(純淡水性・通し回遊性)や底生動物の分類群(水生昆虫類・貝類)によって異なることが示された．その一方，各生活型もしくは各分類群の種数または分類群数と希少性指標の分布は空間的に一致する傾向にあり，種数や分類群数の多い地区ほどレッドリスト掲載種が多い傾向にあることが示された．つまり，魚類の生活型や底生動物の分類群によって異なるものの，数多くの種と希少性の高い種の両者を類似した地域で保全できる可能性が示唆された．今後，水国のデータがもつ有効性が広く認識されることで，国土スケールでの生物多様性の変化や将来予測といった保全研究への活用が進み，環境変化に対する河川生物多様性の保全方法などの提言につながることが期待される．


連続砂防堰堤を持つ河川の水温形成に関する研究

連続砂防堰堤を持つ河川の水温形成に関する研究


吉野川河口汽水域における護岸構造と潮間帯生物の分布に関する研究と研究成果を活かした護岸構造の提案


漁業者から見た吉野川下流域におけるアユの産卵場と河道変遷の関係

漁業者から見た吉野川下流域におけるアユの産卵場と河道変遷の関係

土木学会論文集G(環境)


FACTOR ANALYSIS OF SANDBAR DEFOMATION PROCESSES IN THE MIDDLE REACHES OF YOSHINO RIVER

吉野川中流域における砂州地形の長期的変化に及ぼす要因分析

The Yoshino River, Japan, is rich in water resources, but simultaneously possesses high risk of flood disaster. River improvement works to reduce damage from the floods have been conducted which attain increase of the discharge capacity. On the other hand, local sediment deposition and scouring are growing concern by the repeated floods, decreasing of sediment supply and construction of river structure. In order to resolve these problems, it is necessary to understand the effects of natural and artificial impacts on the river channel. In this paper, the channel transition processes were studied in the Middle Yoshino River using aerial photo, morphology data. Natural and artificial impacts on those processes were evaluated from sandbar deformation, fluctuation of bed elevation and volume in low-water channel. As a result, sandbar deformation by the floods and revetment works was confirmed. The floods and dam construction affected fluctuation of river channel with the sediment deposition and scouring.

Journal of Japan Society of Civil Engineers, Series B1 (Hydraulic Engineering)

土木学会論文集B1(水工学)


嘉瀬川ダム上下流における試験湛水開始前後での堆積・流下有機物の量的・質的変化

嘉瀬川ダム上下流における試験湛水開始前後での堆積・流下有機物の量的・質的変化

土木学会論文集G(環境)


アカテガニを指標とした都市公園緑地の景観構成要素の機能評価

アカテガニを指標とした都市公園緑地の景観構成要素の機能評価


A passive integrated transponder tag implanted by a new alternative surgical method: effects on the oriental weather loach (Misgurnus anguillicaudatus) and application in a small irrigation system.


The effectiveness of delineating ecoregions in the Kyushu region of Japan for establishing environmental indicators


A study on seed dispersal by flood flow in an artificially restored floodplain


Effects of configuration of instream wood on autumn and winter habitat use by fish in a large remeandering reach


置土された土砂の流下過程の数値解析モデルの構築と実河川における適用

置土された土砂の流下過程の数値解析モデルの構築と実河川における適用

Annual Journal of Hydraulic Engineering. JSCE


板櫃川で実施された多自然川づくりの魚類生息環境からみた評価

板櫃川で実施された多自然川づくりの魚類生息環境からみた評価


Determinants of the Misgurnus anguillicaudatus population and its application to conservation planning in Sado Island, Japan

佐渡島の河川のドジョウ密度を決定する要因とその保全策への応用

This paper aims to propose concrete measures for the conservation of the mud loach (Misgurnus anguillicaudatus) in Sado Island of Japan, associated with the reintroduction of Japanese crested ibis (Nipponia nippon) that has a predilection to feed on the loach. The field survey was conducted at 80 sites on 7 rivers in the island in August 2007 and March 2008, in which the loach density and the micro-scale environmental factors (water depth [WD], degree of aquatic vegetation [AV], degree of riparian forest [RF], current velocity [CV], mud river bed [MB], concreted river bed [CB], and river bed pebble size [PS]) of the habitats were surveyed. Additionally, the macro-scale factors (paddy fields area [PA] and reservoirs area [RA] within a specific buffer circle) were also obtained using GIS software. The analysis using GLM and AIC showed that the AV (positive), MV (positive), CB (negative) and RA (positive), and AV (positive), MV (positive) and PA (positive) effect the loach density in August and March, respectively, indicating that the loach preferred the less artificial habitat surrounded by the paddy fields. The potential maps of the loach density were drawn by adapting the models on the rivers in the island: The loach density was especially high in the Kuninaka Plain that situated at central region of the island in both August and March, indicating the region was priority area for the conservation of the loach. In conclusion, removal of concrete revetment in the habitats and improvement of creek networks between rivers and landscape elements (paddy field and reservoirs) in the Kuninaka Plain would be the effective conservation measurements for the loach.

本研究は，ドジョウの保全を目的に，河川のドジョウ生息量に対する景観スケール・局所スケールの環境要因の影響を，GLM により明らかにした．また，得られたモデルよりドジョウの潜在的な生息量を地図上に予測し，ポテンシャルマップを作成した．その結果，以下の知見が得られた．
1) 8 月の河川のドジョウの生息量に対して，水中植生，泥床，コンクリート床，周囲のため池面積が強い影響を及ぼすこと，3 月の河川のドジョウの生息量に対して，周囲の水田面積が強い影響を及ぼすことが示された．
2) 佐渡島中央部に位置する国仲平野の河川で高いドジョウ生息量があると推測され，同地域がドジョウの保全対象地域としてふさわしいことが明らかになった．
3) この結果から，佐渡島のドジョウの保全には，国仲平野において，河川とため池・水田とのネットワークの改善，水際の植生の再生，コンクリート床の撤去が有効な対策であると考えられた．


Migration history of Sakhalin taimen Hucho perryi captured in the Sea od Okhotsk, northern Japan, using otolith Sr : Ca ratios


Evaluation by benthos of the gentle slope revetment which was provided in a tidal river

河川感潮域に整備された緩勾配河岸の底生生物による評価

In order to grasp the effect of the gentle slope revetment works to exert on the biodiversity at a tidal river, we surveyed at the tidal area in the Gokase River in Miyazaki Prefecture about the distributions of physical environments (ground levels, grain diameter and ignition loss of bed material) and the benthic communities at both of the soil-covered gentle slope revetment (A), and the vertical dry stone pitching revetment (b). As the results, the physical environments were similar in a transverse direction at the B section but the A section were successively varied. The kinds, and rare species of benthos, especially insects were rich at the A section rather than the B section. The results suggested that the gentle slope revetment works had improved biodiversity.

土木学会論文集B1(水工学)


Simplified quantification method of the population of benthic animals with hole on a mud tidal flat by digital processing aerial photos

空中写真利用による泥質干潟の潜行性底生動物の簡易定量手法


Population genetic structure, diversity and stocking effect of the oriental weatherloach (Misgurnus anguillicaudatus) in an isolated island, associated with ibis reintroduction


Predicting the spatial distribution of the invasive piscivorous chub (Opsariichthysuncirostris uncirostris) in the irrigation ditches of Kyushu, Japan: a tool for the risk management of biological invasions


Evaluation of irrigation weir improvement for fishes in a stream, Sado Island, Japan

佐渡島の小河川における魚類を対象とした農業用取水堰改良効果の検証


Distribution of the oriental weatherloach (Misgurnus anguillicaudatus) its implications for conservation in Sado Islan, Japan


A review of the research on introduced freshwater fishes: new perspectives, the need for research, and management implications.


Evaluation of a re-meandering project in the Shibetsu River from an aspect of primary production process.

標津川の再蛇行化が一次生産過程に及ぼす影響の評価


Longitudinal macroinvertebrate organization over contrasting discontinuities: effects of a dam and a tributary

Journal of the North American Benthological Society


再生氾濫原におけるドブガイ属の生態と侵入システムに関する事例研究

再生氾濫原におけるドブガイ属の生態と侵入システムに関する事例研究


裂田の溝における護岸改修工事が魚類生息量に与える影響

裂田の溝における護岸改修工事が魚類生息量に与える影響


リュウキュウアユ保全に向けた干潟マングローブ域の水域冷却機能の現地観測

リュウキュウアユ保全に向けた干潟マングローブ域の水域冷却機能の現地観測


Summer Microhabitat Partitioning by Different Size Classes of Masu Salmon (Oncorhynchus masou) in Habitats Formed by Installed Large Wood in a Large Lowland River,

Canadian Journal of Fisheries and Aquatic Sciences


Segment Based Ecoregions Based on Fish Fauna for Biological Indicator

環境指標のための魚類セグメントエコリージョン

The biological indicator should be developed in the ecoregion where biota is relatively identical. Furthermore, as stream biota widely varies from headwater to downstream, it is necessary to define segment based ecoregions where biota is longitudinally identical. In this study, we delineated segment based ecoregions for ten rivers belonging to the northwest Kyushu ecoregion based on the degree of similarity of the fish fauna. The northwest Kyushu ecoregion was divided into five segment based ecoregions. As a result, fish fauna was more clearly characterized by the differences in community structure between segment based ecoregions than those between watersheds. Moreover, distinguishing segment based ecoregions, enabled us to compare the integrity of fish fauna between watersheds, which had been previously difficult to examine.

Annual Journal of Hydraulic Engineering. JSCE

水工学論文集 土木学会水工学委員会 編


九州北部における外来魚類の分布状況

九州北部における外来魚類の分布状況

Bulletin of the Biogeographical Society of Japan


Application of micro-pixe analysis for a migration history study of Hucho Perryi focused on strontium distribution in fish scales


九州北西部，有明海・八代海沿岸域のクリークにおける外来魚の分布の現状

九州北西部，有明海・八代海沿岸域のクリークにおける外来魚の分布の現状

Journal of Japan Society on Water Environment


筑後川上流大山川における流量変動が付着藻類の生育に与える影響

筑後川上流大山川における流量変動が付着藻類の生育に与える影響


北海道北部山地河川における細粒土砂の堆積がイトウの産卵環境および発眼卵生残率に及ぼす影響


River restoration for macroinvertebrate communities in lowland rivers: insights from restorations of the Shibetsu River, north Japan


Methods for and fish responses to channel remeandering and large wood structure placement in the Shibetsu River Restoration Project in northern Japan


The relationship the benthic macroinvertebrates and biotic and abiotic environmental characteristics downstream of Yahagi dam, central Japan, and the state change through a tributary inflow


Historical changes and sedimentary environment of Imazu tidal flat

今津干潟の変遷と堆積環境に関する研究


Effects on fish habitat evaluation by the vegetation covered ratio in Sakuta ditch

裂田水路における水際および水路内植生が魚類の生息量に与える影響


魚類相の縦断方向変化とセグメント区分に関する研究

魚類相の縦断方向変化とセグメント区分に関する研究


Seasonal change in the gastric evacuation rate of rainbow trout feeding on natural prey


裂田水路における河床材料の変化が絶滅危惧種スナヤツメに与える影響に関する研究

裂田水路における河床材料の変化が絶滅危惧種スナヤツメに与える影響に関する研究


Effects of planktonic algae from dam reservoir on feeding condition for Ayu in the upper Chikugo River

筑後川上流(大山川)におけるダム湖由来の浮遊性藻類がアユの採餌環境に与える影響


The stucy of river design consider with fish habitat in the Itabitsu River

板櫃川における魚類の生息環境を考慮した河道設計に関する研究


歴史的観点から見た干潟環境の変化と人の係わりに関する研究

歴史的観点から見た干潟環境の変化と人の係わりに関する研究


Life History Strategies and Habitat Dynamics Associated with Geomorphic Disturbance : Toward Restoration of Impacted River Ecosystems(<Featured Articles>Preface of 25th Anniversary Special Issue of JGU on Frontier of Geomorphology)

地形変化に伴う生物生息場形成と生活史戦略:人為的影響とシステムの再生をめざして

River ecosystem is spatiotemporally dynamic under frequent and intensive geomorphic disturbances, characterized by its fluctuating habitat availability. The species inhabiting there adapt themselves to the shifting habitat by developing various life-history strategies. In regulated rivers, however, suppressed disturbance and habitat dynamics threaten the disturbance-dependent communities. The recognition of important geomorphic perspectives is still in its infancy in conservation of river ecosystems in Japan. Riparian tree species have developed life-history strategies to increase the likelihood of arriving regeneration sites, where disturbance regimes are closely linked to the spatial and temporal availability of regeneration sites. River damming and channel modification severely diminish the critical function of geomorphic disturbance sustaining habitat diversity and abundance. Channel migration ceases in flow-regulated rivers, which may temporarily promote expansion of pioneer forest in the active channels. However, new geomorphic surfaces suitable for establishment of seedlings are no longer created because of altered peak flows and sediment supply, thereby threatening the recruitment opportunity and ultimate survival of their populations. Suppression of geomorphic disturbance also leads to the degradation of in-stream fauna. Channel straightening particularly simplifies geomorphic features of a river reach and diminishes longitudinal and lateral habitat diversity in its active channel. Flood control reduces inundation habitat and disrupts hydrologic connectivity between floodplain habitats (e.g., backwater and oxbow lakes), impacting fish and benthic invertebrates that require those habitats in their various life stages. A channel re-meandering experiment in the Shibetsu River, Hokkaido, demonstrates that the recovery of geomorphic dynamics can play significant roles in restoration of river ecosystems. Meandering reaches develop shallow edge habitat with low hydraulic stress along the inside of a convex, providing stable substrate for macroinvertebrate communities. Fallen trees provided by lateral erosion also promote macroinvertebrate colonization and become in-stream covers for fish communities. Geoecology in Japan as well as Europe and U.S. has long focused on vegetation pattern in alpine regions and has unexplored terrestrial and aquatic ecosystems in the vicinity of human activities. Knowledge in habitat dynamics and geomorphic processes is vital to ecosystem conservation and restoration. We believe that participation of geomorphologists is essential in future development of conservation and restoration strategies.


北川流域における堆積土砂成分の横断分布

北川流域における堆積土砂成分の横断分布


筑後川上流(大山川)における維持流量変化が河川環境に与える影響に関する現地観測

筑後川上流(大山川)における維持流量変化が河川環境に与える影響に関する現地観測


ダム維持放流変化が河床付着生物膜形成に与える影響に関する現地調査

ダム維持放流変化が河床付着生物膜形成に与える影響に関する現地調査


Catchability of six fish species by electrofishing in an experimental stream

実験河川におけるエレクトリックショッカーによる6魚種の捕獲効率


Effects of different bank types on aquatic organisms in an experimental stream: contrasting vegetation with concrete revetment


直線化された川の再蛇行化-分野間の協働について-

直線化された川の再蛇行化-分野間の協働について-


Thermal changes in the gastric evacuation rate of the freshwater sculpin Cottus nozawae Snyder


Morphology, stomach contents and growth of the endangered salmonid, Sakhalin taimen Hucho perryi, captured in the Sea of Okhotsk, northern Japan: evidence of an anadromous form


Limnological characteristics of an oxbow lake in a lower reach of the Shibetsu River in Hokkaido Island, Japan


Effects of a re-meandering project on the physical habitats and fish in the Shibetsu River

標津川下流域で行った試験的な川の再蛇行化に伴う魚類と生息環境の変化


Estimation of stream ecosystems by 13C and 15N natural abundances

炭素，窒素安定同位体自然存在比による河川環境の評価


TERRESTRIAL INVERTEBRATE INPUTS DETERMINE THE LOCAL ABUNDANCE OF STREAM FISHES IN A FORESTED STREAM


A New Approach of Stream Geomorphology Measurement for Habitat Assessment

ハビタットアセスメントにおける河道内微地形の把握手法に関する研究


Stream Fish Habitat Science and Management in Japan : A Review


Contribution of terrestrial invertebrates to the annual resource budget for salmonids in forest and grassland reaches of a headwater stream


Selective foraging on terrestrial invertebrates by rainbow trout in a forested headwater stream in northern Japan