Publications

論文

1. Masaru Sakai, Mirai Watanabe, Masami Kanao Koshikawa, Asuka Tanaka, Akiko Takahashi, Seiichi Takechi, Mai Takagi, Takashi Tsuji, Hideki Tsuji, Toshimasa Takeda, Jaeick Jo, Masanori Tamaoki, Seiji Hayashi (2024) Exploring simple ways to avoid collecting highly 137Cs-contaminated Aralia elata buds for the revival of local wild vegetable cultures. PLOS ONE 19: e0292206 (DOI: 10.1371/journal.pone.0292206)

2. Risa S. Naito*† , Masaru Sakai*† , Yosihiro Natuhara, Yukihiro Morimoto (2024) Roles of rice paddies and neighboring biotopes with different hydroperiods in providing habitat for an endangered pond frog population in Japan. Wetlands 44: 21 (DOI: 10.1007/s13157-024-0178-z) *Corresponding author. †Equal contribution. 

3. 田和康太・西廣 淳・境　優・竹田稔真・林 誠二 (2024) 日本の遊水地における生物多様性に関する研究のシステマティックレビュー. 応用生態工学 26: 55-69 (DOI: 10.3825/ece.23-00011)

4. Kohmei Kadowaki, Mie N. Honjo, Naoto Nakamura, Yoichiro Kitagawa, Masae I. Ishihara, Shunsuke Matsuoka, Yuuya Tachiki, Keitaro Fukushima, Shota Sakaguchi, Inoue Mizuki, Daisuke Fujiki, Masaru Sakai, Atsushi Takayanagi, Michimasa Yamasaki, Naoko Tokuchi, Daiki Takahashi, Koki Nagasawa, Kazutoshi Masuda (2023) eDNA metabarcoding analysis reveals the consequence of creating ecosystem-scale refugia from deer grazing for the soil microbial communities. Environmental DNA 5: 1732-1742 (DOI: 10.1002/edn3.498)

5. Hideki Tsuji, Tatsuhiro Nishikiori, Shoko Ito, Hirokazu Ozaki, Mirai Watanabe, Masaru Sakai, Yumiko Ishii, Seiji Hayashi (2023) Influential factors of long-term and seasonal 137Cs change in agricultural and forested rivers: temperature, water quality and an intense typhoon event. Environmental Pollution 338: 122617 (DOI: 10.1016/j.envpol.2023.122617)

6. Seiji Hayashi, Mirai Watanabe, Masami Kanao Koshikawa, Momo Takada, Seiichi Takechi, Mai Takagi, Masaru Sakai, Masanori Tamaoki (2023) Explaining the variation in 137Cs aggregated transfer factor for wild edible plants as a case study on Koshiabura (Eleutherococcus sciadophylloides) buds. Scientific Reports 13: 14162 (DOI: 10.1038/s41598-023-41351-7)

7. Masaru Sakai, Mitsuru Ohira, Takashi Gomi (2023) Spatiotemporal patterns in differences between the 137Cs concentrations of forest and stream litters: effect of leaching. Environmental Science: Processes & Impacts 25: 1385-1390 (DOI: 10.1039/D3EM00236E)

8. Nobunosuke Itakura, Masaru Sakai*, Ryohei Sato, Shogo Nishihara, Takehito Yoshida, Izumi Washitani (2023) Intraspecific variation in advertisement call characteristics and acoustic strategies among male forest green tree frogs. Population Ecology 65: 266-274 (DOI: 10.1002/1438-390X.12153) *Corresponding author. 

9. Kenta Iwasaki, Keitaro Fukushima, Yu Nagasaka, Nobuo Ishiyama, Masaru Sakai, Akiko Nagasaka (2023) Real-time monitoring and postprocessing of thermal infrared video images for sampling and mapping groundwater discharge. Water Resources Research 59: e2022WR033630 (DOI: 10.1029/2022WR033630)

10. Masaru Sakai (2023) Catchment-scale deer exclusion changes longitudinal patterns of macroinvertebrate communities through soil runoff mitigation. Ecological Engineering 190: 106932 (DOI: 10.1016/j.ecoleng.2023.106932)

11. Masaru Sakai, Gosuke Hoshi, Ryoshiro Wakiya (2023) Ecosystem functions of a spring-fed tributary in providing foraging habitat and thermal refuge for juvenile masu salmon. Ichthyology and Herpetology 111: 44-53 (DOI: 10.1643/i2022050)

12. Hikaru Nakagawa, Keitaro Fukushima, Masaru Sakai, Luhan Wu, Toshifumi Minamoto (2022) Relationship between the eDNA concentration obtained from metabarcoding and stream fish abundance estimate by the removal method under field conditions. Environmental DNA 4: 1369-1380 (DOI: 10.1002/edn3.346)

13. Masaru Sakai, Yumiko Ishii, Hideki Tsuji, Asuka Tanaka, Jaeick Jo, Junjiro N. Negishi, Seiji Hayashi (2022) Contrasting seasonality of 137Cs concentrations in two stream animals that share a trophic niche. Environmental Pollution 315: 120474 (DOI: 10.1016/j.envpol.2022.120474)

14. Kengo Okada, Masaru Sakai*, Takashi Gomi, Aimu Iwamoto, Junjiro N. Negishi, Masanori Nunokawa (2021) Seasonal variations of 137Cs concentration in freshwater charr through uptake and metabolism in 1-2 years after the Fukushima accident. Ecological Research 36: 935-946 (DOI: 10.1111/1440-1703.12266) *Corresponding author. Top Cited Article 2021-2022に選ばれました。 

15. 金指 努・境　優・ 今村直広・大橋伸太 (2021) 福島第一原子力発電所事故後の森林における放射性セシウム動態と渓流生態系への影響. 地球化学 55: 144-158 (DOI: 10.14934/chikyukagaku.55.144)

16. Mitsuru Ohira, Yu'usuke Watanabe, Takashi Gomi, Masaru Sakai (2021) Long-term impacts of forest disturbances: Comparing cumulative effects of clearcut logging versus landslide on stream conditions and abundance of a headwater stonefly Scopura montana. Freshwater Biology 66: 2004-2015 (DOI: 10.1111/fwb.13811)

17. Masaru Sakai, Ryoshiro Wakiya, Gosuke Hoshi (2021) Flood-induced interspecific interactions in spring-fed tributary as an ecosystem function of heterogeneous river networks. Landscape and Ecological Engineering 17: 555-561 (DOI: 10.1007/s11355-021-00465-8)

18. Masaru Sakai, Katsuya Iwabuchi, David Bauman  (2021) Unique habitat and macroinvertebrate assemblage structures in spring-fed stream: a comparison among clastic lowland tributaries and mainstreams in northern Japan. Community Ecology 22: 193-202 (DOI: 10.1007/s42974-021-00048-5)

19. Masaru Sakai, Hideki Tsuji, Yumiko Ishii, Hirokazu Ozaki, Seiichi Takechi, Jaeick Jo, Masanori Tamaoki, Seiji Hayashi, Takashi Gomi  (2021) Untangling radiocesium dynamics of forest-stream ecosystems: A review of Fukushima studies in the decade after the accident. Environmental Pollution 288: 117744 (DOI: 10.1016/j.envpol.2021.117744) プレスリリースあり：本成果は、2021年8月25日福島民友新聞第3面、8月27日NEWS SALTで紹介されました。

20. 井上奈津美・井上 遠・松本 斉・境　優・吉田丈人・鷲谷いづみ (2021) 奄美大島の亜熱帯照葉樹林における樹洞現存量と樹洞形成に関わる要因の評価：樹洞利用生物の保全のために．保全生態学研究 26: 15-32 (DOI: 10.18960/hozen.2019)

21. 今井健介・吉村真由美・境　優・夏原由博 (2020) 防鹿柵で囲まれた集水域と囲まれなかった集水域の二次渓流における，柵設置1年後の水生昆虫群集. 日本環境動物昆虫学会誌 31: 101-109

22. Mizuki Inoue, Hiroki Ito, Michimasa Yamasaki, Shigeru Fukumoto, Yuuki Okamoto, Masaya Katsuki, Keitaro Fukushima, Masaru Sakai, Shota Sakaguchi, Daisuke Fujiki, Hikaru Nakagawa, Masae Ishihara, Atsushi Takayanagi (2020) Seasonal and annual fluctuations of deer populations estimated by a Bayesian state-space model. PLOS ONE 15: e0225872  (DOI: 10.1371/journal.pone.0225872)

23. Noelikanto Ramamonjisoa, Masaru Sakai, Serge H. Ndriantsoa, Ryosuke Kakehashi, Atsushi Kurabayashi, Nobuhiro Tomaru, Yosihiro Natuhara (2020) Hotspots of stream tadpole diversity in forest and agricultural landscapes in Ranomafana, Madagascar. Landscape and Ecological Engineering 16: 207-221 (DOI: 10.1007/s11355-020-00407-w)

24. Masaru Sakai, Shin-ichi Suda, Taichi Okeda, Ryosuke Nomura, Izumi Washitani (2019) The importance of riparian subtropical lucidophyllous forest to odonate conservation. Aquatic Conservation: Marine and Freshwater Ecosystems 29: 682-692 (DOI: 10.1002/aqc.3099)

25. Takeshi Fujino, Shota Kobori, Takeshi Nomoto, Masaru Sakai, Takashi Gomi (2018) Radioactive cesium contamination and its biological half-life in larvae of Stenopsyche marmorata (Trichoptera: Stenopsychidae). Landscape and Ecological Engineering 14: 37-43 (DOI: 10.1007/s11355-017-0339-5)

26. Takashi Gomi, Masaru Sakai, Md. Enamul Haque, Kosuke Hosoda, Hiroto Toda (2018) Evaluating 137Cs detachment from coniferous needle litter in a headwater stream: A litter bag field experiment. Landscape and Ecological Engineering 14: 17-27 (DOI: 10.1007/s11355-017-0337-7)

27. Junjiro N. Negishi, Masaru Sakai, Kengo Okada, Aimu Iwamoto, Takashi Gomi, Kazuki Miura, Masanori Nunokawa, Mitsuru Ohira (2018) Cesium-137 contamination of river food-webs in a gradient of initial fallout deposition in Fukushima, Japan. Landscape and Ecological Engineering 14: 55-66 (DOI: 10.1007/s11355-017-0328-8)

28. Md. Enamul Haque, Takashi Gomi, Masaru Sakai, Junjiro N. Negishi (2018) Seasonal variation in food web-based transfer factors of radiocesium in white-spotted char (Salvelinus leucomaenis) from headwater streams. Landscape and Ecological Engineering 14: 45-53 (DOI: 10.1007/s11355-016-0324-4)

29. Masaru Sakai, Shin-ichi Suda, Taichi Okeda, Izumi Washitani (2017) Identifying priority habitats and monitoring species for conservation and restoration of lentic Odonata habitats: assemblage nestedness on Amami-Oshima Island, Japan. Ecological Research 32: 693-702 (DOI: 10.1007/s11284-017-1490-z)

30. Md. Enamul Haque, Takashi Gomi, Masaru Sakai, Junjiro N. Negishi (2017) Developing a food web-based transfer factor of radiocesium for fish, white-spotted char (Salvelinus leucomaenis) in headwater streams. Journal of Environmental Radioactivity 172: 191-200 (DOI: 10.1016/j.jenvrad.2017.02.020)

31. Masaru Sakai, Keitaro Fukushima, Risa S. Naito, Yosihiro Natuhara, Makoto Kato (2016) Coniferous needle litter acts as a stable food resource for stream detritivores. Hydrobiologia 779: 161-171 (DOI: 10.1007/s10750-016-2813-8)

32. Masaru Sakai, Takashi Gomi, Junjiro N. Negishi (2016) Fallout volume and litter type affect 137Cs concentration difference in litter between forest and stream environments. Journal of Environmental Radioactivity 164: 169-173 (DOI: 10.1016/j.jenvrad.2016.07.030)

33. Masaru Sakai, Takashi Gomi, Junjiro N. Negishi, Aimu Iwamoto, Kengo Okada (2016) Different cesium-137 transfers to forest and stream ecosystems. Environmental Pollution 209: 46-52 (DOI: 10.1016/j.envpol.2015.11.025)

34. Phong K. Thai, Yuma Suka, Masaru Sakai, Kazuki Nanko, Jui-Hung Yen, Hirozumi Watanabe (2015) Export of radioactive cesium from agricultural fields under simulated rainfall in Fukushima. Environmental Science: Processes & Impacts 17: 1157-1163 (DOI: 10.1039/C5EM00063G)

35. Masaru Sakai, Takashi Gomi, Risa S. Naito, Junjiro N. Negishi, Michiko Sasaki, Hiroto Toda, Masanori Nunokawa, Kaori Murase (2015) Radiocesium leaching from contaminated litter in forest streams. Journal of Environmental Radioactivity 144: 15-20 (DOI: 10.1016/j.jenvrad.2015.03.001)

36. Masaru Sakai, Takashi Gomi, Masanori Nunokawa, Taeko Wakahara, Yuichi Onda (2014) Soil removal as a decontamination practice and radiocesium accumulation in tadpoles in rice paddies at Fukushima. Environmental Pollution 187:112-115 (DOI: 10.1016/j.envpol.2014.01.002) 本成果は、2014年3月7日科学新聞第6面、2014年3月16日読売新聞第19面で紹介されました。

37. 境 優 (2013) シカの過採食による森林と渓流生態系の相互作用の変化. 日本緑化工学会誌 39:248-255 (LINK)

38. 渡邉祐介・五味高志・布川雅典・境 優 (2013) スギ・ヒノキ人工林渓流における水生生物の生息状況―東京農工大学フィールドミュージアム唐沢山における事例―. フィールドサイエンス11:31-40

39. Mizuki Inoue, Shota Sakaguchi, Keitaro Fukushima, Masaru Sakai, Atsushi Takayanagi, Daisuke Fujiki, Michimasa Yamasaki (2013) Among-year variation in deer population density index estimated from road count surveys. Journal of Forest Research 18:491-497 (DOI: 10.1007/s10310-012-0379-5)

40. Risa Naito, Masaru Sakai, Yosihiro Natuhara, Yukihiro Morimoto, Shozo Shibata (2013) Microhabitat use by Hyla japonica and Pelophylax porosa brevipoda at levees in rice paddy areas of Japan. Zoological Science 30:386-391 (DOI: 10.2108/zsj.30.386)

41. Masaru Sakai, Yosihiro Natuhara, Keitaro Fukushima, Risa Naito, Hideaki Miyashita, Makoto Kato, Takashi Gomi (2013) Responses of macroinvertebrate communities to 4 years of deer exclusion in first- and second-order streams. Freshwater Science 32:563-575 (DOI: 10.1899/12-116.1)

42. Masaru Sakai, Yosihiro Natuhara, Keitaro Fukushima, Ayumi Imanishi, Kensuke Imai, Makoto Kato (2013) Ecological functions of persistent Japanese cedar litter in structuring stream macroinvertebrate assemblages. Journal of Forest Research 18:190-199 (DOI: 10.1007/s10310-012-0339-0)

43. 境 優・夏原由博・加藤 真 (2012) 芦生研究林上谷流域における渓流の底生動物分布パターン. 森林研究 78:19-27 (LINK)

44. Risa Naito, Masaru Sakai, Yukihiro Morimoto (2012) Negative effects of deep roadside ditches on Pelophylax porosa brevipoda dispersal and migration in comparison with Hyla japonica in a rice paddy area in Japan. Zoological Science 29:599-603 (DOI: 10.2108/zsj.29.599)

45. Masaru Sakai, Yosihiro Natuhara, Ayumi Imanishi, Kensuke Imai, Makoto Kato (2012) Indirect effects of excessive deer browsing through understory vegetation on stream insect assemblages. Population Ecology 54:65-74 (DOI: 10.1007/s10144-011-0278-1) 本成果は、2014年度日本森林学会学生奨励賞を受賞しました。

46. 境 優・平野智章・青木文聡・寺嶋智巳・夏原由博 (2009) 森林植生の樹種および管理状態が小流域の短期流出特性に及ぼす影響. 日本緑化工学会誌 35:306-317

47. 平野智章・寺嶋智巳・中村智博・境 優・青木文聡・名波明菜 (2009) 針葉樹林流域と広葉樹林流域の短期流出特性の違い―降雨イベントの規模が森林流域の水流発生機構に及ぼす影響―. 水文・水資源学会誌 22:24-39

48. 平野智章・寺嶋智巳・中村智博・青木文聡・境 優 (2008) 管理放棄されたヒノキ人工林および天然生落葉広葉樹林における土壌表層部の水流発生機構. 地形 29:255-280

書籍

1. Masaru Sakai, Risa S. Naito, David Bauman (2023) Spring ecosystems in Japan: Knowledge and perspectives. Lawrence E. Stevens (Ed.) Springs of the World: Distribution, Ecology, and Conservation Status, Springs Stewardship Institute, Arizona, USA, pp. 97-100 (LINK)

2. Masaru Sakai, Keitaro Fukushima, Hikaru Nakagawa (2022) Indirect effects of deer overgrazing on stream ecosystems. Koichi Kaji, Hiroyuki Uno, Hayato Iijima (Eds.) Sika Deer: Life History Plasticity and Management, Springer, pp. 463-482 (LINK)

3. Takeshi Fujino, M. D. H. J. Senavirathna, Masaru Sakai, Takashi Gomi (2021) Characteristics of 137Cs concentration and radioactivity transfer in large aquatic insect species. Seiya Nagao (Ed.) Impacts of Fukushima Nuclear Accident on Freshwater Environments, Springer, pp. 169-184 (LINK)

4. 五味高志・戸田浩人・境 優 (2018) 原子力災害がもたらす森林―渓流生態系の放射性セシウム汚染. 中村太士・菊沢喜八郎（編）森林と災害（森林科学シリーズ第3巻）第6章（pp. 198-226）, 共立出版

5. (監修) 鷲谷いづみ・(編) 須田真一・境 優・桶田太一 (2017) 総天然色 ネイチャーガイド 奄美大島のトンボ. 自主出版 (LINK)

報文など

1. 境 優 (2023) 対策の多機能性：田んぼダムは治水と生物多様性保全を両立させるか？国立環境研究所 環境報告書 2023, pp. 4 (LINK)

2. 境 優 (2022) 川の生き物の放射性セシウム濃度はどのようにして決まるのか．FRECC+ おしえて!研究者さん (LINK)

3. 趙在翼・境 優・常盤達彦・浅野希梨・日下部直美・竹田稔真・石井弓美子 (2021) 郡山市逢瀬町におけるサワダマメゲンゴロウ（ゲンゴロウ科）の記録．InsecTOHOKU 57: 26

4. 芦生生物相保全プロジェクト（ABC project）パンフレット（改訂版）自主出版 (LINK)

5. 境 優 (2021) 土から森の動植物へ取り込まれる放射性セシウムを減らすには？ NIESレターふくしま2021年4月号 pp. 7 (LINK)

6. 林誠二・大原利眞・中村省吾・境 優・高木麻衣 (2021) 災害環境研究のこれまでとこれから　ふくしまで進める地域協働の新展開. 環境儀 80 pp. 1-16 (LINK)

7. 福島慶太郎・井上みずき・山崎理正・阪口翔太・高柳敦・境 優・中川光・平岡真合乃・吉岡憲成・池川凛太郎・石原正恵 (2020) 芦生冷温帯天然林における集水域単位のシカ防護柵の生態系機能保全効果と実用性の検証ー芦生生物相保全プロジェクト―. 自然保護助成基金助成成果報告書 29:1-13 (LINK)

8. 五味高志・境 優 (2017) 山地渓流における森と川のつながりと放射性セシウムの動態. ワイルドライフフォーラム 21:13-16

9. 五味高志・境 優 ・渡邉裕純(2016) 流域環境における放射性セシウムの動態と生態系での移行評価. 農薬環境科学研究 24:1-5

10. 岩崎雄一・梁政寛・境 優 (2014) 書評「河川生態学」. 日本生態学会ニュースレター No.34 (2014年9月) 14-15

11. 福島慶太郎・井上みずき・境 優・阪口翔太・岩井有加・橋本智之・本田美里・坂田ゆず・藤木大介・山崎理正・中島皇・高柳敦 (2013) 芦生冷温帯天然林における大規模シカ防除柵設置5年度の生態系機能の回復過程とそのメカニズムに関する研究. プロ・ナトゥーラ・ファンド第21期助成成果報告書 27-52

12. 境 優・福島慶太郎 (2012) スギ人工林の間伐及び林道設置などの森林施業が渓流の底生動物群集に与える影響. 概算要求事業「森里海連環学による地域循環木文化創出事業（木文化プロジェクト）」 2010年度報告書:113-117

13. 福島慶太郎・井上みずき・阪口翔太・藤木大介・山崎理正・境 優・齊藤星耕・中島皇・高柳敦 (2011) ニホンジカによる過採食が芦生の冷温帯天然林の生物多様性と生態系機能に及ぼす影響の解明. プロ・ナトゥーラ・ファンド第20期助成成果報告書 181-199

14. 芦生生物相保全プロジェクト（ABC project）パンフレット 自主出版、LINK：ページ左側トピック最下段よりダウンロードできます。