Keita Nishizawa​ (西澤 啓太)

Positions

2023 – Present, Assistant Professor, The University of Tokyo

2022 – Present, Part-time Lecturer, Tamagawa University

2022 – 2023, Specially Appointed Assistant Professor, The University of Tokyo

2022 – 2022, Postdoctoral Fellow, The University of Tokyo

2020 – 2022, Postdoctoral Fellow, Yokohama National University

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Educations

2020, Ph.D., Graduate School of Environment and Information Sciences, 

　　　　　　　   Yokohama National University (A. Mori’s lab)

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2017, M.S., Graduate School of Environment and Information Sciences, 

　　　　　　　   Yokohama National University (A. Mori’s lab)

2015, B.S., Department of Architecture, Infrastructure,Ocean Engineering and Ecosystem Science, 

　　　　　　　   Yokohama National University (A. Mori’s lab)

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Grants

2023, RCAST Grant (K. Nishizawa)

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2023-2026, Grant-in-Aid for Early-Career Scientists (K. Nishizawa)

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2023, Leave a Nest Research Fund, Forest Science Award (K. Nishizawa)

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2022, RCAST Grant (K. Nishizawa)

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2021-2023, ArCS Ⅱ Complementary Research Projects (K. Nishizawa, et al.)

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2020-2025, ArCS Ⅱ : Arctic Challenge for Sustainability Ⅱ (H. Kobayashi et al.)

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2018, ArCS Overseas Fellowship Program (K. Nishizawa)

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2017-2020,  Research Fellow of the Japan Society for the Promotion of Science, DC1 (K. Nishizawa)

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2017, ArCS Overseas Fellowship Program (K. Nishizawa)

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2016-2018, Pro Natura Fund Grant (A. Mori, K. Nishizawa, et al.)

Awards

2022, Best Poster Award (Takeuchi, Nishizawa et al.), Ecological Society of Japan

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2021, Excellent Poster Award (Wakatsuki, Nishizawa and Mori), Ecological Society of Japan

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2017, Repayment Exemption for Outstanding Achievements (Japan Student Services Organization) 

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2017, Change the world 2017 (Nishizawa et al. 2016), Springer Nature
 

2017, Ecological Research Award 2016 (Nishizawa et al. 2016), Ecological Society of Japan

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2016, Excellent Poster Award (Nishizawa et al.), Ecological Society of Japan

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Publications

Shinohara N,  Kobayashi Y, Nishizawa K, Kadowaki K, Yamawo A (2024) Plant–mycorrhizal associations may explain the latitudinal gradient of plant community assembly. Oikos: e10367.

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Naka M, Masumoto S, Nishizawa K, Matsuoka S, Tatsumi S, Kobayashi Y, Suzuki KF, Xu X, Kawakami T, Katayama N, Makoto K, Okada K, Uchida M, Takagi K, Mori AS (2024) Long-term consequences on soil fungal community structure: Monoculture planting and natural regeneration. Environmental Management: 1-11.

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Tatsumi S, Ohgue T, Azuma WA, Nishizawa K (2023) Bark traits affect epiphytic bryophyte community assembly in a temperate forest. Plant Ecology: 1089-1095.

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Masumoto S, Mori AS, Nishizawa K, Naka M, Matsuoka S,Wong SK, Uchida M. (2023) Synergistic effects of succession and microtopography of moraine on the fungal spatial di v ersity in a glacier forefield. FEMS Microbiology Ecology: 99: fiad090

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Kobayashi Y, Haga C, Shinohara N, Nishizawa K, Mori AS (2023) Dominant temperate and subalpine Japanese trees have variable photosynthetic thermal optima according to site mean annual temperature. Global Ecology and Biogeography: 397-407.

 

Masumoto S, Kitagawa R, Kaneko R, Matsuoka S, Nishizawa K, Uchida M, Mori AS (2023) Discrepancies of fungi and plants in the pattern of beta-diversity with environmental gradient imply a comprehensive community assembly rule. FEMS Microbiology Ecology: fiac157.

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Nishizawa K†, Shinohara N†, Cadotte MW, Mori AS (2022) The latitudinal gradient in plant community assembly processes: a meta-analysis. Ecology Letters 25(7), 1711-1724. (†Equal contribution)

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Masumoto S, Kitagawa R, Nishizawa K, Kaneko R, Osono T, Hasegawa M, Matsuoka S, Uchida M, Mori AS (2021) Functionally explicit partitioning of plant β-diversity reveal soil fungal assembly in the subarctic tundra. FEMS Microbiology Ecology 97: fiab129.

Masumoto S, Kitagawa R, Nishizawa K, Kaneko R, Osono T, Hasegawa M, Iimura Y, Mori AS , Uchida M (2021) Plant species and biomass, soil respiration, soil environment data on Whapmagoostui-Kuujjuarapik, Quebec, Canada. Polar data journal, 5: 80-88.

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Wakatsuki Y, Nishizawa K, Mori AS (2021) Leaf trait variability explains how plant community composition changes under the intense pressure of deer herbivory. Ecological Research 36: 521-532.

Nishizawa K, Deschamps L, Maire V, Bêty J, Lévesque E, Kitagawa R, Masumoto S, Gosselin I, Morneault A, Rochefort L, Gauthier G, Tanabe Y, Uchida M, Mori AS (2021) Long-term consequences of goose exclusion on nutrient cycles and plant communities in the High-Arctic. Polar Science 27: 100631.

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Matsuoka S, Doi H, Masumoto S, Kitagawa R, Nishizawa K, Tanaka K, Hasegawa M, Hobara S, Osono T, Mori AS, Uchida M (2021) Taxonomic, functional, and phylogenetic diversity of fungi in a forest-tundra ecotone in Quebec. Polar Science 24: 27: 100562.

Masumoto S, Kitagawa R, Nishizawa K, Osono T, Hasegawa M, Imura Y, Matsuoka S, Kaneko R, Uchida M, Mori AS (2021) Integrative assessment of the effects of shrub coverage on soil respiration in a tundra ecosystem. Polar Science 27: 100594.

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Kitagawa R, Masumoto S, Nishizawa K, Kaneko R, Osono T, Hasegawa M, Uchida M, Mori AS (2019) Positive interaction facilitates landscape homogenization by shrub expansion in the forest–tundra ecotone. J. Veg. Sci. 31: 234-244.

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Nishizawa K, Mori AS (2018) Forest ecosystem management for biodiversity conservation: a focus on the possible roles of deer hervivory as a natural disturbance. Annual Report of Pro Natura Foundation Japan 27 (in Japanese with English abstract)

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Stephan J G, Pourazari F, Tattersdill K, Kobayashi T, Nishizawa K, De Long J R (2017) Long-term deer exclosure alters soil properties, plant traits, understory plant community and insect herbivory, but not the functional relationships among them. Oecologia 184.3: 685-699.

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Nishizawa K, Tatsumi S, Kitagawa R, Mori AS (2016) Deer herbivory affects the functional diversity of forest floor plants via changes in competition-mediated assembly rules. Ecol Res 31:569-578. doi: 10.1007/s11284-016-1367-6, PDF

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Presentations

English

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Rie Takeuchi, Keita Nishizawa, Yuta Kobayashi, Shota Masumoto, Kureha F Suzuki, Tomoya Kawakami, Makoto Kobayashi, Noboru Katayama, Keiichi Okada, Shinnichi Tatsumi, Shunsuke Matsuoka, Masaki Uchida, Kentaro Takagi, Akira S Mori, Fifty-year Dynamics of Organic Matter Decomposition Following Soil-scarification Practices : Comparing Natural Regeneration and Monospecies Planting (ササ掻き起こし施業による有機物分解特性の50年間の変化：天然更新と単一種植栽の比較), The 71th annual meeting of the Ecological Society of Japan, A02-09, Yokohama, Japan, March, 2024 (Oral)

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Xinyu Xu, Shu Kuan Wong, Keita Nishizawa, Masaki Uchida,  Akira S Mori, Contribution of complexity and stability of fungal community to multifunctionality in the Arctic, The 71th annual meeting of the Ecological Society of Japan, A02-01, Yokohama, Japan, March, 2024 (Oral)

Minagi Naka, Keita Nishizawa, Shota Masumoto, Shunsuke Matsuoka, Marc-Elie Adaime, Masaki Uchida, Akira S Mori, Successional development of soil fungal community on aglacier foreland in The high Arctic, ISAR-7, Tachikawa (Japan), March, 2023 (Oral)

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Shota Masumoto, Ryo Kitagawa, Ryo Kaneko, Keita Nishizawa, Shunsuke Mastsuoka, Masaki Uchida, Akira Mori, Discrepancies of fungi and plants in the pattern of beta-diversity with environmental gradient imply a comprehensive community assembly rule, The 13th Symposium on Polar Science, Tachikawa (Japan), December, 2022, (Oral)

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Minagi Naka, Keita Nishizawa, Shota Masumoto, Yuta Kobayashi, Kureha Suzuki, Tomoya Kawakami, Noboru Katayama, Makoto Kobayashi, Keichi Okada, Shinichi Tatsumi, Shunsuke Matsuoka, Masaki Uchida, Kentaro Takagi, Akira S Mori, Recovery of Soil Fungal Community: Monoculture Plantation versus Natural Regeneration, The 13th Symposium on Polar Science, Tachikawa (Japan), December, 2022, (Oral)

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Keita Nishizawa, Lucas Deschamps, Vincent Maire, Joël Bêty,  Esther Lévesque, Ryo Kitagawa, Shota Masumoto, YukikoTanabe, Masaki Uchida, Akira S.Mori, The ecological consequences of herbivore disappearance in the Arctic ecosystems, the comparison of active and passive exclusion (Les conséquences écologiques de la disparition des herbivores dans les écosystèmes arctiques, la comparaison entre l’exclusion active et passive), CEN's Annual Symposium, Montreal (Canada), February, 2020, (Poster)

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Ryo Kitagawa, Shota Masumoto, Keita Nishizawa, Ryo Kaneko, Takashi Osono, Motohiro Hasegawa, Masaki Uchida, Akira S Mori,  Positive interaction facilitates landscape homogenization by shrub expansion in the forest–tundra ecotone (Une interaction positive facilite l'homogénéisation du paysage par l'expansion des arbustes dans l'écotone forêt-toundra), CEN's Annual Symposium, Montreal (Canada), February, 2020, (Poster)

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Keita Nishizawa, Ryo Kitagawa, Shota Masumoto, Akira Mori, Reinterpreting the role of neutrality in community assembly from the Tundra plant community in northern Canada (カナダ北極域のツンドラ群集から考える植物群集集合における中立性),  The 66th annual meeting of the Ecological Society of Japan, P2-330, Kobe, Japan (Oral), (第 66 回日本生態学会, P2-330, 神戸, 2019年3月 (口頭))

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Masumoto Shota, Ryo Kitagawa, Ryo Kaneko, Keita Nishizawa, Yasuo Iimura, Takashi Osono, Motohiro Hasegawa, Masaki Uchida, Akira Mori, Effect of plant community structure on soil respiration of tundra ecosystem through multiple ecosystem functions in Canadian Arctic, 14th ArcticNet Annual Scientific Meeting 2018, Ottawa (Canada) December 2018, December, 2018, (Oral)

Ryo Kitagawa, Ryo Kaneko, Motohiro Hasegawa, Shunsuke Matsuoka, Shota Masumoto, Keita Nishizawa, Takashi Oosono, Masaki Uchida, Akira Mori, Change in multi-taxa communities along a environmental gradient in the Canadian subarctic tundra, 14th ArcticNet Annual Scientific Meeting 2018, Ottawa (Canada) December 2018, December, 2018, (Oral)

Takashi Osono, Shota Masumoto, Ryo Kitagawa, Ryo Kaneko, Keita Nishizawa, Yasuo Iimura, Motohiro Hasegawa, Masaki Uchida, Akira S Mori, Effect of plant community structure on soil respiration of tundra ecosystem through multiple ecosystem functions in Canadian Arctic, 14th ArcticNet Annual Scientific Meeting 2018, Ottawa (Canada) December 2018, December, 2018, (Oral)

Takashi Osono, Ryo Kitagawa, Ryo Kaneko, Motohiro Hasegawa, Shunsuke Matsuoka, Shota Masumoto, Keita Nishizawa, Masaki Uchida, Akira S Mori, Change in multi-taxa communities along a environmental gradient in the Canadian subarctic tundra, 14th ArcticNet Annual Scientific Meeting 2018, Ottawa (Canada) December 2018, December, 2018, (Oral)

Ryo Kaneko, Ryo Kiatagawa, Keita Nishizawa, Shota Masumoto, Akira Mori, Jun Uetake, Masaharu Tsuji, Masaki Uchida, Soil bacterial communities and environments in the Canadian subarctic tundra, The 9th Symposium on Polar Science, Tachikawa (Japan), December, 2018, (Poster)

Takashi Osono, Kaho Tanaka, Shunsuke Matsuoka, Ryo Kitagawa, Shota Masumoto, Keita Nishizawa, Motohiro Hasegawa, Masaki Uchida, Akira S Mori, Assessment of fungal diversity on plant litter in a subarctic tundra, The 9th Symposium on Polar Science, Tachikawa (Japan), December, 2018, (Poster)

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Keita Nishizawa, Ryo Kitagawa, Shota Masumoto, Masaki Uchida, Akira Mori, The assembly mechanisms of various patchy-tundra community upon the harsh parabolic dune, CEN's Annual Symposium, Sherbrooke (Canada), February, 2018, (Poster)

Shota Masumoto, Ryo Kitagawa, Ryo Kaneko, Keita Nishizawa, Masaki Uchida, Akira Mori, Effect of plant species diversity on tundra ecosystem multifunctionality in Canadian Arctic, The 8th Symposium on Polar Science, Tachikawa (Japan), December, 2017, (Poster)

Ryo Kitagawa, Shota Masumoto, Ryo Kaneko, Keita Nishizawa, Masaki Uchida, Akira Mori, Community assembly rule for tundra vegetation in lower arctic region, The 8th Symposium on Polar Science, Tachikawa (Japan), December, 2017, (Poster)

Keita Nishizawa, Ryo Kitagawa, Shota Masumoto, Masaki Uchida, Akira Mori, The assembly mechanisms of patchy-tundra plant community at the forest-tundra boundary, The 8th Symposium on Polar Science, Tachikawa (Japan), December, 2017, (Oral)
 

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Japanese

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西澤 啓太, 仲美凪, 増本翔太, 内田雅己, 森章, カナダ北極域で頂点捕食者のシロフクロウがもたらす植物多様性. 第71回日本生態学会, 横浜. 2024年3月（ポスター）

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竹内理絵, 西澤啓太, 小林勇太, 増本翔太, 鈴木紅葉, 河上智也, 片山昇, 小林真, 岡田慶一, 辰巳晋一, 松岡俊将, 内田雅己, 高木健太郎, 森章, 天然更新と単一種植栽の違いが土壌分解系に与える影響,  第134回 日本森林学会大会, P-449,  鳥取 (オンライン), 2023年3月（ポスター）

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河上智也, 片山 昇, 西澤啓太, 小林勇太, 鈴木紅葉, 森 章, 小林 真, ミミズの保全に配慮した森林管理を目指して：か
き起こし施業を事例に, 第134回 日本森林学会大会, T1-7,  鳥取 (オンライン), 2023年3月（口頭）

 

西澤啓太, 森章, 北極域及び高山帯における植物群集の時間変化の傾向とその決定要因, 第 70回日本生態学会, P2-105, 仙台(オンライン), 2023年3月 (ポスター)

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西澤啓太, 篠原 直登, Marc Cadotte, 森章, メタ解析による群集集合プロセスの緯度クラインの検証, 第 69回日本生態学会, D03-05, 福岡(オンライン), 2022年3月 (口頭)

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井上里彩, 西澤啓太, 森章, 食糧貿易による気候変動と生物多様性への遠隔環境責任の可視化, 第 69 回日本生態学会, P1-461, 福岡(オンライン), 2022年3月 (ポスター)

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竹内理絵, 西澤啓太, 小林勇太, 増本翔太, 鈴木紅葉, 河上智也, 片山昇, 小林真, 岡田慶一, 辰巳晋一, 高木健太郎, 森章, 時系列データに基づくササ掻き起こし施業の生態系機能評価:森林生態系管理の指針, 第 69 回日本生態学会, P1-286, 福岡(オンライン), 2022年3月 (ポスター)

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仲美凪, 増本翔太, 西澤啓太, 小林勇太, 鈴木紅葉, 山田靖子, 小林真, 岡田慶一, 佐々木雄大, 高木健太郎,森章, 幼木の成長を周囲の植物群集は助けるか、妨げるか ：促進効果と競争効果を分離する, 第 69 回日本生態学会, E01-01, 福岡(オンライン), 2022年3月 (口頭)

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河上智也, ⽚⼭昇, ⻄澤啓太, ⼩林勇太, 鈴⽊紅葉, 森章, ⼩林真, 地表かき起こし施業からの経過年数に伴うミミズ群集の回復と団粒発達, 第133回 日本森林学会大会, P-276, 山形(オンライン), 2022年3月（ポスター）

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若月優姫, 西澤啓太, 森章, シカ採食による葉の経済的損失から植生変化のメカニズムをさぐる(Assessing responses of plant community composition to deer herbivory based on leaf carbon economics), 第 68 回日本生態学会, P1-187, 岡山(オンライン), 2021年3月 (ポスター)

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西澤啓太, 群集集合過程における分散能力の中立性 (The neutrality of the dispersal ability in the community assembly process), 第 67 回日本生態学会, 自由集会 W26-2, 名古屋, 2020年3月 (口頭)

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若月優姫, 西澤啓太, 森章, シカの採食撹乱に対する林床植物群集の応答 ～個葉の炭素収支からの評価～ (Assessing responses of plant community composition to deer herbivory based on leaf carbon economics), 第 67 回日本生態学会, P1-PC-358, 名古屋, 2020年3月 (ポスター)

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有働沙也佳, Forest Isbell, 藤井佐織, 小林真, 西澤啓太, 岡田慶一, 森章, 森林生態系における植物多様性と多機能性の時空間変動, 第 66 回日本生態学会, P2-330, 神戸, 2019年3月 (ポスター)

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若月優姫, 西澤啓太, 森章, 葉の資源投資戦略から見るシカ採食下の植物群集組成の変化 (Leaf economic spectrum explains how plant community composition can change under the intense pressure of deer herbivory), 第 66 回日本生態学会, P1-033, 神戸, 2019年3月 (ポスター)

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長谷川元洋, 北川涼, 増本翔太, 西澤啓太, 大園享司, 内田雅己, 森章, カナダ東部のツンドラ植生における中型土壌動物群集構造の緯度にともなう変化, 第 66 回日本生態学会, P2-330, 神戸, 2019年3月 (ポスター)

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長谷川元洋, 北川涼, 増本翔太, 西澤啓太, 大園享司, 内田雅己, 森章, カナダハドソン湾周辺のツンドラ植生における中型土壌動物群集の構造 -緯度の異なる2地域の比較-, 第41回日本土壌動物学会大会, 京都   2018年5月 (ポスター)

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西澤啓太, 藤井佐織, 北川涼, 辰巳晋一, 森章, 防鹿柵がもたらす植物群集の機能構造と撹乱後の応答の違い, 第 65 回日本生態学会, P3-001, 札幌, 2018年3月 (ポスター)

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長谷川元洋, 北川涼, 増本翔太, 西澤啓太, 大園享司, 内田雅己, 森章, カナダのツンドラ南限付近における中型土壌動物群集の構造と環境要因との関係, 第40回日本土壌動物学会, P-18, 2017年5月(ポスター)

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北川涼, 増本翔太, 西澤啓太, 長谷川元洋, 大園享司, 内田雅己, 森章, カナダツンドラの植物群集と規定要因, 第 64 回日本生態学会,  P2-B-032, 東京, 2017 年 3 月(ポスター)

増本翔太, 北川涼, 西澤啓太, 長谷川元洋, 大園享司, 内田雅己, 森章, カナダツンドラにおける植物群落構造が生態系の多機能性に及ぼす影響, 第 64 回日本生態学会,  P2-B-029, 東京, 2017 年 3 月(ポスター)

西澤啓太, 藤井佐織, 北川涼, 辰巳晋一, 森章 プレス型―パルス型撹乱の相互作用が植物群集の再集合に与える影響,  第 64 回日本生態学会,  P2-B-030, 東京, 2017 年 3 月(ポスター)

西澤啓太, 辰巳晋一, 北川涼, 森章, 自然撹乱としてのシカ採食の役割―林床植物の群集集合プロセスからの評価, 第 63 回日本生態学会, P1-006, 仙台, 2016 年 3 月 (ポスター)

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Outreach​

Publications

西澤 啓太, エルズミア―北極圏で探る生物多様性の原点, ArCS II News Letter No.8, 2024年2月

Keita Nishizawa, Ellesmere — Exploring the Origins of Arctic Biodiversity, ArCS II News Letter No.8, February, 2023

西澤 啓太, 多様な植物が共存できる理由は？緯度に沿ったパターンを発見, ArCS II News Letter No.6, 2023年2月

Keita Nishizawa, Why Can Diverse Plants Coexist? Discovering Patterns Along Latitudes, ArCS II News Letter No.6, February, 2023

西澤 啓太, 北極圏の生態系に魅かれて, RCAST NEWS 118号, 2023年2月. 

 

Invited Seminars

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The forest floor structure and plant diversity in Shiretoko forest , BETA-FOR Workshop,  Hunsrück-Hochwald National Park, Germany, 01.03.2024

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北極圏の現地調査から考える生物多様性と気候変動, ぶちエコVR～2050ゼロカーボン・チャレンジ！～, 山口県, 2023年12月

北極圏のお話し・身近な生態系, 紀州くちくまの熱中小学校, 和歌山県, 2023年12月

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極域における気候変動と植物群集への影響, A3フォーサイト, 京都, 2023年12月
 

群集集合：生物多様性の仕組み, 東京大学 未来ビジョン研究センター, 東京, 2023年9月

北極域における研究活動と生活, 東京大学先端科学技術研究センター, 東京, 2023年6月

”生物多様性”の現在地と課題, ビヨンドカンファレンス2023, 京都, 2023年5月

エゴと森林〜過去・現在・未来〜, 超異分野学会東京大会2023, 東京, 2023年3月

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Lectures​

玉川大学 農学部 基礎生物学実験 (2022-)

東京大学 先端科学技術研究センター 先端デバイス論 (2023)

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Reviews

Journal of Vegetation Science, Ecological Research (2), Population Ecology

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