SHIGEKI WADA

Last Updated :2025/05/09

Web Site
https://sites.google.com/view/biologicaloceanographylab/home?authuser=0
E-mail
swadasbmhiroshima-u.ac.jp
Self-introduction
We are studying the interaction between marine organisms and their environments. Our main focus is on the process of carbon sequestration through biological activity and the impact of high CO2 levels on organisms and ecosystems.

Basic Information

Academic Degrees

  • University of Tsukuba

Educational Activity

Course in Charge

  1. 2025, Liberal Arts Education Program1, 1Term, Introduction to Applied Biological Sciences toward SDGs
  2. 2025, Liberal Arts Education Program1, 2Term, Introduction to Field Sciences
  3. 2025, Undergraduate Education, 1Term, Introduction to Applied Biological Sciences
  4. 2025, Undergraduate Education, 3Term, Seminar in Field Science
  5. 2025, Undergraduate Education, 3Term, Research Front of Bioresource Science
  6. 2025, Undergraduate Education, 2Term, Hydrospheric Primary ProductionII
  7. 2025, Undergraduate Education, 4Term, Introduction to Hydrospheric Biodiversity
  8. 2025, Undergraduate Education, Intensive, Practical Work in Hydrospheric Field ScienceII
  9. 2025, Undergraduate Education, 1Term, Exercises in Integrative Hydrospheric ScienceI
  10. 2025, Undergraduate Education, Second Semester, Graduation Thesis I
  11. 2025, Undergraduate Education, First Semester, Graduation Thesis II
  12. 2025, Undergraduate Education, Second Semester, Graduation Thesis III
  13. 2025, Undergraduate Education, Intensive, Seminar in Fildwork on Community Coasts
  14. 2025, Undergraduate Education, Intensive, Practice on economic marine invertebrates and seaweeds in the Seto Inland Sea
  15. 2025, Undergraduate Education, Intensive, Practice and Field Work in Fisheries Science
  16. 2025, Undergraduate Education, Year, Special Practice I
  17. 2025, Undergraduate Education, Year, Practical Course in Marine Bioscience and Technology IV
  18. 2025, Undergraduate Education, Year, Practice on East China Sea Study
  19. 2025, Undergraduate Education, Year, Practical Course on Fisheries Science and the Marine Environment I-B
  20. 2025, Undergraduate Education, Year, Practice Course on Fisheries Science and the Marine Environment III
  21. 2025, Undergraduate Education, Year, Practical Course in Marine Bioscience and Technology I
  22. 2025, Undergraduate Education, Year, Practical Course in Marine Bioscience and Technology II
  23. 2025, Undergraduate Education, Intensive, Practice Course on Fisheries Science Data Analysis I
  24. 2025, Undergraduate Education, Intensive, Practice Course on Fisheries Science Data Analysis II
  25. 2025, Undergraduate Education, Second Semester, Practice on Primary Production (Plankton and Benthos) in the Marine Ecosystem
  26. 2025, Graduate Education (Master's Program) , 2Term, Fisheries Oceanography I
  27. 2025, Graduate Education (Master's Program) , 4Term, Fisheries Oceanography II

Research Activities

Academic Papers

  1. Simple and convenient preconcentration procedure for the isotopic analysis of uranium in seawater, Analytical Methods, 16(16), 2478-2488, 20240428
    Link to Paper Search Results by DOI
  2. Cohesive bond strength of marine aggregates and its role in fragmentation, FRONTIERS IN MARINE SCIENCE, 10, 202308
  3. Ocean acidification increases the impact of typhoons on algal communities, SCIENCE OF THE TOTAL ENVIRONMENT, 865, 202303
  4. Potential ecosystem regime shift resulting from elevated CO2 and inhibition of macroalgal recruitment by turf algae, Theoretical Ecology, 202303
  5. Organic matter composition regulates residual potential of organic carbon of the seagrass Zostera marina L. during its decomposition process in seawater, Marine Environmental Research, 105790-105790, 202211
  6. Massive loss and microbial decomposition in reproductive biomass of Zostera marina, Estuarine, Coastal and Shelf Science, 107986-107986, 202207
  7. Does the Kuroshio Current transport planktonic larvae of the hydrothermal-vent crab Xenograpsus Takeda & Kurata, 1977 (Decapoda: Brachyura: Grapsoidea)?, Journal of Crustacean Biology, 42(1), ruac016, 202203
  8. Understanding coralline algal responses to ocean acidification: Meta-analysis and synthesis, GLOBAL CHANGE BIOLOGY, 28(2), 362-374, 202201
  9. Simplification, not “tropicalization”, of temperate marine ecosystems under ocean warming and acidification, Global Change Biology, 27(19), 4771-4784, 202110
  10. Feedback mechanisms stabilise degraded turf algal systems at a CO seep site, Communications biology, 4(1), 219, 202109
  11. Characterizing behavior of fatty acids in natural organic samples during loss on ignition (LOI) in each temperature, Chemistry Letters, 20210715
  12. EFFECTS OF RISING CO2 ON ALGAE IN JAPAN, PHYCOLOGIA, 60(1:SI), 59-59, 202107
  13. Ocean acidification locks algal communities in a species-poor early successional stage, GLOBAL CHANGE BIOLOGY, Epub(10), 2174-2187, 202105
  14. Ocean acidification increases phytobenthic carbon fixation and export in a warm-temperate system, Estuarine, Coastal and Shelf Science, 250(5), 107113, 202103
  15. Characterization of Organic Biomolecules (Monosaccharide, Fatty Acid, and Amino Acid) by Losses on Ignition under Stepwise Increases in Temperature, Chemistry Letters, 50(4), 560-562, 2021
  16. Experimental analysis of diurnal variations in humic-like fluorescent dissolved organic matters in surface seawater., Frontiers in Marine Science, 7, 589064, 202010
  17. Changes in fish communities due to benthic habitat shifts under ocean acidification conditions, Science of The Total Environment, 725, 138501, 202007
  18. Relationship between iodine and carbohydrate contents in the seagrass Zostera marina on the northwestern Pacific coast of central Japan, Botanica Marina, 0(0), 20200430
  19. Seasonal dynamics of seawater CO2 system at a coastal site near the southern tip of Izu Peninsula, Japan, Journal of Oceanography, 20200217
  20. Aggregation of marine organic matter by bubbling, Journal of Oceanography, 20200107
  21. Influence of congestion on user's perceived crowding and satisfaction, on the beach in Shikine Island, Japan, Papers on environmental information science, 34, 31-36, 2020
  22. Diatoms Dominate and Alter Marine Food-Webs When CO2 Rises, DIVERSITY-BASEL, 11(12), 242, 201912
  23. Using organic compounds to assess the dominant controls on seasonal iodine variability in the brown alga Ecklonia cava in the northwestern Pacific coast of central Japan, JOURNAL OF APPLIED PHYCOLOGY, 201910
  24. Vertical and seasonal variations of dissolved incline concentration in coastal seawater on the northwestern Pacific coast of central Japan, CONTINENTAL SHELF RESEARCH, 188, 103966, 201910
  25. First record of a shallow hydrothermal vent crab, Xenograpsus testudinatus, from Shikine-jima Island in the Izu archipelago, Biogeography, 21, 31-36, 201909
  26. Seasonal variations in iodine concentrations in a brown alga (Ecklonia cava Kjellman) and a seagrass (Zostera marina L.) in the northwestern Pacific coast of central Japan, JOURNAL OF OCEANOGRAPHY, 75(1), 111-117, 201902
  27. Dissolution: The Achilles' Heel of the Triton Shell in an Acidifying Ocean, FRONTIERS IN MARINE SCIENCE, 5, 201810
  28. Dissolution: The Achilles' Heel of the Triton Shell in an Acidifying Ocean, FRONTIERS IN MARINE SCIENCE, 5, 371, 201810
  29. Ocean acidification drives community shifts towards simplified non-calcified habitats in a subtropical-temperate transition zone, SCIENTIFIC REPORTS, 8, 201807
  30. Production and degradation of fluorescent dissolved organic matter derived from bacteria, JOURNAL OF OCEANOGRAPHY, 74(1), 39-52, 201802
  31. Recognition of Diving Operators and Fishermen to Shallow CO2 Seep in Shikine Island, Japan, Papers on Environmental Information Science, 32(0), 227-232, 2018
  32. Effect of ocean acidification on primary producer in coastal environment: Change of ecosystems in CO2 seeps, Chikyukagaku, 51(4), 195-205, 2017
  33. Response of a phytoplankton community to nutrient addition under different CO2 and pH conditions, JOURNAL OF OCEANOGRAPHY, 72(2), 207-223, 201604
  34. Photoreactivity of dissolved organic matter from macroalgae, REGIONAL STUDIES IN MARINE SCIENCE, 2, 12-18, 201511
  35. Geochemistry of two shallow CO2 seeps in Shikine Island (Japan) and their potential for ocean acidification research, REGIONAL STUDIES IN MARINE SCIENCE, 2, 45-53, 201511
  36. Gaetice depressus (Crustacea, Varunidae): Species profile and its role in organic carbon and nitrogen flow, OCEAN SCIENCE JOURNAL, 50(2), 389-401, 201506
  37. Enhancement of dimethylsulfide production by anoxic stress in natural seawater, GEOPHYSICAL RESEARCH LETTERS, 42(10), 4047-4053, 201505
  38. Carbohydrate analysis by methanolysis method and application to compositional analysis of transparent exopolymer particles., Advances in Bioscience and Biotechnology, 201309
  39. The contribution of macroalgae to the coastal dissolved organic matter pool, ESTUARINE COASTAL AND SHELF SCIENCE, 129, 77-85, 201309
  40. Stable isotope signature and pigment biomarker evidence of the diet sources of Gaetice depressus (Crustacea: Eubrachyura: Varunidae) in a boulder shore ecosystem, Plankton and Benthos Research, 8(2), 55-67, 2013
  41. The effect of zinc on aquatic microbial ecosystems and the degradation of dissolved organic matter, CHEMOSPHERE, 90(3), 1091-1102, 201301
  42. Application of gas chromatography to exuded organic matter derived from macroalgae, Advanced gas chromatography, 307-322, 201203
  43. Effect of ocean acidification on coastal phytoplankton composition and accompanying organic nitrogen production, JOURNAL OF OCEANOGRAPHY, 68(1), 183-194, 201202
  44. Inhibitory effect of zinc on the remineralisation of dissolved organic matter in the coastal environment, AQUATIC MICROBIAL ECOLOGY, 63(1), 47-59, 2011
  45. Tetracycline Resistance Genes Persist at Aquaculture Farms in the Absence of Selection Pressure, ENVIRONMENTAL SCIENCE & TECHNOLOGY, 45(2), 386-391, 201101
  46. Regional variation in shell utilization patterns of the hermit crab Pagurus filholi, Plankton Benthos Res., 4(2), 72-76, 200907
  47. Bioavailability of macroalgal dissolved organic matter in seawater, MARINE ECOLOGY PROGRESS SERIES, 370, 33-44, 2008
  48. Quantitative and qualitative analyses of dissolved organic matter released from Ecklonia cava Kjellman, in Oura bay, Shimoda, Izu Peninsula, Japan, JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY, 349(2), 344-358, 200710

Publications such as books

  1. 2020/05, Japanese Marine Life: A Practical Training Guide in Marine Biology, Japanese Marine Life: A Practical Training Guide in Marine Biology, Contributor, jpn, Agostini, Sylvain; Harvey Benjamin, Paul; Shigeki, Wada
  2. 2020/05, Japanese Marine Life: A Practical Training Guide in Marine Biology, Japanese Marine Life: A Practical Training Guide in Marine Biology, Contributor, jpn, Agostini, Sylvain; Harvey Benjamin, Paul; Shigeki, Wada
  3. 2020, Japanese Marine Life, Japanese Marine Life, Contributor, eng, 和田茂樹, 9789811513268
  4. 2020, Japanese Marine Life, Japanese Marine Life, Contributor, eng, 和田茂樹, 9789811513268
  5. 2020, Japanese Marine Life, Japanese Marine Life, Contributor, eng, 和田茂樹, 9789811513268
  6. 2018, 自然保護学入門 －ひとと自然をつなぐ－, 自然保護学入門 －ひとと自然をつなぐ－, Contributor, jpn, 和田茂樹
  7. 2012, 藻類ハンドブック, 藻類ハンドブック, Contributor, jpn, 和田茂樹; 濱健夫

Invited Lecture, Oral Presentation, Poster Presentation

  1. Light irradiation on bacterial-derived dissolved organic matter as a source of low molecular weight organic compound: A laboratory study, Uning, Royston; 大森裕子; 和田茂樹; 谷本浩志, 日本地球惑星科学連合2023年大会
  2. 未来の海を使って生態系の将来を探る, 和田, 茂樹, 海洋生物シンポジウム2023
  3. Selective aggregation with bubbles on sea surface, 和田, 茂樹, ISBEC 2023
  4. 自然の高 CO2 海域を利用した付着生物群集・生態系の将来予測, 和田, 茂樹, 日本付着生物学会５０周年シンポジウム
  5. 二酸化炭素の増えた未来の海で生態系の変化を探る, 和田, 茂樹, 第７回海中海底工学フォーラム・ZERO
  6. 極微量人工放射性Uの海洋循環トレーサー利用簡便化に向けた海水中U捕集法の検討, 阿部, 美波; 坂口, 綾; 瀬古, 典明; 保科, 宏行; Karin Hain; 和田, 茂樹; 山﨑 信哉; 末木, 啓介, 2021年度日本地球化学会第68回年会, 2021/09/01, オンライン発表
  7. Assessment of bacterial decomposition of macroalgal organic matter absed on thermal degradation, 河上菜々子; Wada, Shigeki, ASLO 2021 Aquatic Sciences Meeting, 2021/06/22, USA オンライン
  8. Cohesive strength of marine organic aggregates, 林靖人; Wada, Shigeki, ASLO 2021 Aquatic Sciences Meeting, 2021/06/22, USA オンライン
  9. Degraded turf algal systems are ‘locked-in’ by ocean acidification, Ben, Harvey; Ro, Allen; Agostini, Sylvain; Linn, J Hoffmann; Koetsu, Kon; Tina, C Summerfield; Shigeki, Wada; Jason; M. Hall-Spencer, Japan Geoscience Union Meeting 2021, 2021/05/30, Japan online
  10. 東京都式根島の海水浴場における混雑度が利用者の混雑感及び満足感に与える影響, 武, 正憲; 和田茂樹, 第34回環境情報科学学術研究論文発表会, 2020/12, （社）環境情報科学センター, オンライン
  11. The dominance of turf-forming diatoms under ocean acidification and their role in community succession, Harvey Benjamin, Paul; Allen, Ro; Agostini, Sylvain; Hoffmann, Linn J; Kon, Koetsu; Summerfield, Tina C; Wada, Shigeki; Hall-Spencer; Jason M, Marine Biotechnology Conference 2019, 2019/09/09, Japan Shizuoka
  12. Quantification of microbial and photochemical production of oxygenated volatile organic compounds in coastal seawater, Omori, Yuko; Takahashi, Toshiki; Tanimoto, Hitoshi; Inomata, Satoshi; Wada, Shigeki, SOLAS Open Science Conference, 2019/04/23, SOLAS, Japan Sapporo
  13. Fate of macroalgal organic matter and its effects on in and outside of algal bed, 和田, 茂樹; omori, yuko; hama, takeo, Japan Geoscience Union Meeting 2019, 2019
  14. Recognition of Diving Operators and Fishermen to Shallow CO2 Seep in Shikine Island, Japan, 氏家, 萌美; 武, 正憲; 原, 光宏; 和田, 茂樹, 第32回環境情報科学学術研究論文発表会, 2018/12/17
  15. Dissolution: the Achilles’ heel of gastropods in an acidifying ocean, Harvey, Benjamin Paul; Agostini, S; Wada, S; Inaba, K; Hall-Spencer, J.M, PICES 2018 Annual Meeting, 2018/10/25, Japan Yokohama, Ocean acidification is expected to negatively impact many calcifying marine organisms by impairing their ability to build their protective shells and skeletons, and by causing dissolution and erosion. Here we investigated the large predatory ‘Triton shell’ gastropod Charonia lampas in acidified conditions near CO2 seeps off Shikine-jima (Japan) and compared them with individuals from an adjacent bay with ambient seawater pH. By using computed tomography and electron microscopy we show that acidification negatively impacts their thickness, density and shell structure, causing visible deterioration to the shell surface. Periods of aragonite undersaturation caused the loss of the apex region, exposing body tissues. While gross calcification rates were likely reduced near CO2 seeps, the corrosive effects of acidification were far more pronounced around the oldest parts of the shell. As a result, the capacity of many marine gastropods to maintain their shells under ocean acidification may be strongly driven by abiotic dissolution and erosion, and not under biological control of the calcification process. Understanding the response of marine calcifying organisms and their ability to build and maintain their protective shells and skeletons will be important for our understanding of future marine ecosystems.
  16. Photosynthetic activity of early successional phytobenthos at a shallow CO2 seep off Shikine Island, Japan, Wada, Shigeki; Sylvain, Agostini; Harvey, Ben; 大森裕子; Hall-Spencer; Jason M, PICES 2018 Annual Meeting, 2018/10/28
  17. Effects of ocean acidification on net community production in coastal ecosystems: In situ assessment in natural CO2 seep, Kurosawa, Shingo; Wada, Shigeki; Sylvain, Agostini; Harvey, Ben; Milazzo, Marco; Hall-Spencer; Jason M, PICES 2018 Annual Meeting, 2018/10/28
  18. 富士箱根伊豆国立公園式根島における浅瀬 CO2シープの観光価値, 武, 正憲; 原, 光宏; 和田茂樹, 第129回日本森林学会大会, 2018/03, 高知大学
  19. 観光遊覧船からの4K 動画記録を用いた下田湾内の釣り利用状況把握, 坂入愛; Take, Masanori; 和田茂樹, 第128回日本森林学会大会, 2017/03
  20. 釣り人の行動把握－遊覧船からの動画記録の分析, Take, Masanori; 坂入愛; 和田茂樹, 第22回「野生生物と社会」学会大会, 2016
  21. Effect of Ocean Acidification on Microbial Population and Function 1. Primary Production Processes, 鈴木,莉紗; 柏崎,啓人; 井上,幸樹; 和田,茂樹; 緑川,貴; 石井,雅男; 笹野,大輔; 小杉,如央; 濱,健夫, 日本地球化学会年会, 2013/09/20, 我々は微生物群集に対する海洋酸性化の影響を評価するため、大型培養系を用いた評価を実施した。沿岸海水を6基の500L水槽に移し、二酸化炭素分圧を400ppm、800ppm、および1200ppmに調整した空気を通気した。二酸化炭素分圧とpHを安定させた後、栄養塩を添加し、約1ヶ月間培養を行った。一次生産速度を測定するため、採取した海水にトレーサー（13C-NaHCO3）を添加し培養した。
    生産速度およびChl.aあたりの生産速度は1200ppmの条件下で低くなる傾向が見られた。海水中の二酸化炭素分圧の上昇は一般的に光合成活性を増加させると考えられているが（Doney et al.， 2009）、本実験ではその様な傾向は認められなかった。本実験では条件により植物プランクトン群集組成の変化も認められており、本結果は海洋酸性化に対する光合成活性の応答が植物プランクトングループにより異なる可能性を反映しているものと思われる。
  22. Effect of Ocean Acidification on Microbial Population and Function -Phytoplankton Composition-, 井上,幸樹; 鈴木,莉紗; 柏崎,啓人; 和田,茂樹; 緑川,貴; 石井,雅男; 笹野,大輔; 小杉,如央; 濱,健夫, 日本地球化学会, 2013/09/20, 近年、大気CO2 濃度の上昇とそれに伴う海洋CO2の増加によって海洋酸性化が生じており、海洋の生態系や物質循環に対する影響が懸念されている。植物プランクトンは海洋生態系を支える主要な生産者であり、植物プランクトン群集への酸性化の影響は海洋全体に大きな影響を及ぼす可能性がある。そこで本研究では、自然群集培養実験により、海洋酸性化が植物プランクトン群集へ及ぼす影響を調査した。
    フローサイトメトリーと高速液体クロマトグラフィーを用いた指標色素分析の結果、実験終盤において、酸性化条件下では大きさ2?m以下のピコ植物プランクトンの割合が増加する傾向や、条件による指標色素組成の違いが確認された。これらの結果は、酸性化により植物プランクトン群集組成が変化する可能性を示すとともに、群集のサイズ組成が変化し、海洋の物質循環にも影響が生じる可能性を示唆している。
  23. Effect of Ocean Acidification on Microbial Population and Function - 3.Production of FDOM, 柏崎,啓人; 鈴木,莉紗; 井上,幸樹; 緑川,貴; 石井,雅男; 笹野,大輔; 小杉,如央; 濱,健夫; 和田,茂樹, 日本地球化学会年会, 2012/09/20, 海洋による大気CO2の吸収により、海洋のpHが低下する海洋酸性化が進行している。この酸性化により海洋生態系に様々な変化が生ずることが予想される。海洋に存在するDOMは、地球表層において最大級の有機炭素リザーバーのひとつである。近年の研究でDOM中の1つであるFDOMはバクテリアが主な生成源であることが明らかになっている。またバクテリア起源のDOMが難分解性DOMとして、比較的長期にわたり残存することも見出された(微生物炭素ポンプ)。これは、バクテリア起源のFDOMが炭素の長期固定物質として機能していることを示す。本研究では、この役割が海洋酸性化によりどのように変化するか調査した。
    実験後半において400、800ppmにおいて高い濃度が維持された。このような難分解なDOCは、バクテリアの代謝産物である可能性が高い。酸性化が進行した処理区においてDOC濃度の残存量が少なかったことから、酸性化により微生物炭素ポンプの効率が減少する可能性が示唆された。
  24. Release of bottom-drifting algae and its role as organic carbon source to benthic ecosystem in coastal environment, 和田,茂樹; 小森,真里菜; 濱,健夫, 日本地球化学会, 2012/09/01, 底層を漂流する海藻(寄り藻)は、底生生態系の有機炭素源となることが考えられるが、その生成量の定量的評価はなされていない。本研究では北太平洋に普遍的に生息するカジメを対象とし、寄り藻の生成に伴う有機炭素の放出量の定量化を実施した。さらに、ドレッジ調査から底生生物相への影響を解析し、底生生態系における有機炭素源としての寄り藻の役割の評価を実施した。その結果、寄り藻の生成量は海藻の基礎生産量の約30%に相当し、光合成生産物の行方としての重要性が明らかとなった。さらに、底生生物相は寄り藻の存在によって特徴的なものとなったことから、沿岸の底生生態系に有機炭素を供給し、特徴的な生態系を形作ることが示唆された。

External Funds

Acceptance Results of Competitive Funds

  1. 2022/04/01, 2027/03/31
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  2. Grants-in-Aid for Scientific Research, Indirect effects of ocean acidification on rocky shore communities, 2022/04/01, 2026/03/31
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  3. Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), 2019/04/01, 2023/03/31
  4. Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), 2018/04/01, 2022/03/31
  5. Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (S), Environmental Interface Engineering Based on Dynamic Analysis of Colloidal Flocculation, 2016/05/31, 2021/03/31
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  6. Grants-in-Aid for Scientific Research Challenging Research (Exploratory), 2017/06/30, 2020/03/31
  7. Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research, Photochemical reaction and stability of marine fluorescent dissolved organic matter - a key process of bacterial long-term isolation of carbon, 2015/04/01, 2017/03/31
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  8. Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B), Effect of ocean acidification on production of sinking particles, 2013/04/01, 2016/03/31
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  9. Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A), Characteristic feature of ocean acidification in coastal area and its effect on microalgae, 2012/04/01, 2016/03/31
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  10. 2012/04, 2013/03
  11. 2010/10, 2011/09
  12. 2010/10, 2011/09
  13. Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research, Contribution of chlorophyll derivatives in ocean organic matter pool-evaluation by comprehensive method, 2010, 2011
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