8 research interests

1.   Assessing & predicting "field" impacts of metals on aquatic ecosystems (particular focus on aquatic insects).

2.   Predicting effects of metal mixtures

3.   Estimating population- and community-level ecological risks by mathematical and statistical models (e.g., population models and species sensitivity distribution approach) 

4.   Environmental policies (e.g., how to manage chemicals particularly impacts of metals discharged from abandoned mines; water abstraction right)

5.   Freshwater managements such as determination of environmental flow and control of invasive species

6.   Anything fun

7.   Helping (Working with) persons who are eager to do something

8.   Unthought-of (collaborative) work 

Refereed Papers  inc. review and opinion papers 

1. Koji Ueda, Yutaka Kameda, Emiko Fujita, Gakushi Fujimura, Eiji Fukazawa, Yutaro Numazawa, Yuichi Iwasaki, Wataru Naito (2025) Size-specific distribution, morphology, and polymer composition of microplastic particles in surface water and sediments of Tokyo Bay. Microplastics and Nanoplastics. 5: 47. Link (accepted Dec 2025, officially published Dec 2025). Open access

2. Yuichi Iwasaki*, Hiroko Arai*, Akihiro Tamada, Hirokatsu Kataoka (accepted) Japanese mayfly family classification with a vision transformer model. Limnology. ##(#): ###–###. Link (accepted June 2025, officially published XXX 202X;  *These authors contributed equally to this work). Preprint

3. Yuichi Iwasaki, and Wataru Naito (2025) Biochemical oxygen demand as a proxy for dissolved organic carbon in Japanese rivers: Conservative estimates for ecological risk assessment. Limnology. ##(#): ###–###. Link (accepted June 2025, officially published XXX 202X). Preprint

4. Yasunori Yamashita, Yuichi Iwasaki, Carlos Augusto Strüssmann (accepted) Experimental observation of the prior residence advantage in masu salmon in an experimental channel. Ecological Solutions and Evidence. 6(4): e70132. Link (accepted July 2025, officially published Oct 2025). Open access.

5. Noriko Uchida, Yuichi Iwasaki, Ryoichi Kuranishi, Natsuko Kondo (accepted) Application of environmental DNA-based assessment for upstream-downstream comparison of river macroinvertebrates in a metal-contaminated river. Environmental DNA. 7(5): e70200. Link (accepted Sep 2025, officially published Oct 2025). BioRxiv Open access.

6. Leah M. Thornton Hampton, Dana Briggs Wyler, Bethanie Carney Almroth, Scott Coffin, Win Cowger, Darragh Doyle, Eden K. Hataley, Sara J. Hutton, Magdalena M. Mair, Ezra L. Miller, Laura Monclús, Emma E. Sharpe, Siddiqui Samreen, Kazi Towsif Ahmed, Quinn P. V. Allamby, Ana L. Antonio Vital, Davide Asnicar, Jennifer L. Bare, Andrew Barrick, Katherine Berreman, Lidwina Bertrand, Virginia Boone, Agathe Bour, Julian Brehm, Victor Carrasco-Navarro, Travis Cook, Garth A. Covernton, Patricia Cubanski, Pedro M. C. Da Silva, Luan de Souza Leite, Sam M. Gene, Ludovic Hermabessiere, Asta Hooge, Yuichi Iwasaki, Natasha Klasios, Christine M. Knauss, Azora König Kardgar, Philipp Kropf, Isaac B. Kudu, Anna Kukkola, Christian Laforsch, Stephanie B. Kennedy, Frederic D. L. Leusch, Lucy Wei Li, Hsuan-Cheng Lu, Judd Mahan, Uddin Md Saif, Simona Mondellini, John P. Norman, Zacharias Pandelides, Tove Petersson, Danielle A. Philibert, Elina Kvist, Anja F. R. M. Ramsperger, Gabrielle Rigutto, Sven Ritschar, Monica H. Sandgaard, Jona Schmitt, Matthias Schott, Michael Schwarzer, Katryna J. Seabrook, Teresa M. Seifried, Rohan Sepahi, Mariella Siña, Alex N. Testoff, Maaike Vercauteren, Colleen M. Wardlaw, Andrew Yeh, Rachel Zajac-Fay, and Alvine C. Mehinto (2025) The Toxicity of Microplastics Explorer (ToMEx) 2.0. Microplastics and Nanoplastics. 5:1 38. Link (accepted Aug 2025, officially published Sep 2025). Open access.

7. Kasutaka M. Takeshita and Yuichi Iwasaki (2025) Rethinking how we assess chemical impacts on biodiversity: Beyond correlation.  Environmental Science & Technology. 59(33): 17390–17392. Link. (Viewpoint article: accepted Aug 2025; published Aug 2025; Both authors contributed equally and Y. Iwasaki is the corresponding author) 

8. Momo Takada, Eriko Minari, Shinji Matsumoto, Yuichi Iwasaki, Kaoru Suzuki, Tetsuo Yasutaka (2025). Comparison of public acceptance of the recycling and final disposal of radioactively contaminated soil and waste resulting from the Fukushima Daiichi Nuclear Power Station accident. Journal of the Society for Remediation of Radioactive Contamination in the Environment 13(2): 33–44. Link (accepted April 2025, officially published Aug 2025).

9. Koji Ueda, Yutaka Kameda, Emiko Fujita, Shingo Rachi, Yuichi Iwasaki, Rie Tai, Wataru Naito (2025) Concentrations and characteristics of microplastic particles collected by neuston net or pump System in the surface layer of Tokyo Bay. Regional Studies in Marine Science. 84: 104108. Link (accepted Feb 2025, officially published June 2025). Open access. Preprint

10. Yuichi Iwasaki*, Tomoko Oguri*, Kazutoshi Ueda, Kentaro Morita (2025) Significant metal accumulation in fish in a metal-contaminated river without detectable effects on fish and macroinvertebrate communities. Environmental Toxicology and Chemistry. 44(5): 1228–1234. Link (accepted Jan 2025, officially published May 2025; *These authors contributed equally to this work; Brief Communication).  Postprint

11. Kohei Doyama, Yuichi Iwasaki, Takaya Hamai, Tetsuo Yasutaka (2025) Development of a risk assessment framework for untreated mine drainage discharge due to extensive rainfall in abandoned mines. Journal of MMIJ. 141: 7–15. Link. in Japanese with English abstract. (accepted Feb 2025, officially published April 2025). Open access

12. Yuichi Iwasaki, Wataru Naito (2025) Metal exposure profiles at metal-contaminated sites in rivers across Japan. Environmental Monitoring and Contaminants Research. 5: 35–39. Link (Status Reports; accepted Jan 2025, officially published Mar 2025). Open access 

13. Jun Yasumoto, Mariko Iijima, Akira Iguchi, Takashi Nakamura, Ryogo Takada, Mina Yasumoto-Hirose, Yuichi Iwasaki, Tetsuo Yasutaka, Kanami Mori-Yasumoto, Ryuichi Shinjo, Ryota Ide, Alice Yamazaki, Nanami Mizusawa, Yoshikazu Ohno, Atsushi Suzuki, Shugo Watabe, and Ko Yasumoto (2025) Coral decline linked to exchangeable phosphate in seawater from coastal calcareous sediments, as evidenced in Sekisei Lagoon, Japan. Marine Biotechnology, 27(2): 50 Link (accepted Jan 2025, officially published Mar 2025)

14. Yuichi Iwasaki, Miina Yanagihara (2025) Comparison of model-averaging and single-distribution approaches to estimating species sensitivity distributions and hazardous concentrations for 5% of species. Environmental Toxicology and Chemistry. 44(3): 834–840. Link (accepted Nov 2024, officially published Mar 2025). Open access 

15. Yuichi Iwasaki (2025) Submit your “best” manuscripts to SETAC journals.  Environmental Toxicology and Chemistry. 44(3): 609–610. Link (accepted Nov 2024, officially published Mar 2025; Letters to Editor). Preprint

16. Kyoshiro Hiki, Kensuke Kito, Tatsuhiro Niino, Hiroshi Honda, Makoto Ishimota, Shiro Kawahara, Yuichi Iwasaki (2025) Harnessing the Taskforce on Nature-related Financial Disclosures (TNFD) for chemical risk management with integrated ecotoxicology and ecology. Environmental Toxicology and Chemistry. 44(2): 303–305. Link (accepted Nov 2024, officially published Feb 2025; K.Hiki and Y. Iwasaki are the corresponding authors; Points of Reference). 

17. Chisato Kataoka, Ryo Horimoto, Yuichi Iwasaki, Hiroki Higashibata, Nobumitsu Miyanishi, Shosaku Kashiwada (2024) Distribution of microplastics on sandy beaches in western and southern Japan and its fate in the oceans. Discover Oceans. 1, 27. Link (accepted Oct 2024; officially published Oct 2024) Open access 

18. Takeshi Hano, Mana Ito, Taku Sato, Takuma Sugaya, Jun Sato, Marko Jusup, Yuichi Iwasaki (2024) Triple Jeopardy: The Combined Effects of Viral, Chemical, and Thermal Stress on Kuruma Prawn (Penaeus Japonicus) Juveniles. Science of the Total Environment. 952, 175934. Link  (accepted Aug 2024; officially published Nov 2024) Preprint

19. Yuichi Iwasaki, Koji Ueda, Wataru Naito (2024) Converting effect concentrations obtained from laboratory toxicity tests into concentrations relevant to polydisperse microplastic particles present in the environment. Japanese Journal of Environmental Toxicology (Brief Communications). 27(1), 46–52. in Japanese with English abstract. Link (accepted May 2024; officially published July 2024) Open access 

20. Koji Ueda, Yuichi Iwasaki, Yutaka Kameda, Wataru Naito (2024) Estimation of microplastic particle concentration considering unmeasured particle size range and concentration conversion.  Journal of Japan Society on Water Environment (Technical paper). 47(4), 105–112. in Japanese with English abstract. Link (accepted Feb 2024; officially published July 2024) Open access 

21. Masanori Shiro, Ayumu Miyakawa, Tsukasa Fujita, Masanao Ochi, Yuichi Iwasaki, Tetsuo Yasutaka (2024) "Ask AnyOne" Researcher Collaboration System: Design, Implementation, and Future Prospects. Bulletin of the Geological Survey of Japan, 75(2): 73-81.  Link. in Japanese with English abstract. (accepted May 2024; officially published June 2024) Open access 

22. Miina Yanagihara, Kyoshiro Hiki, Yuichi Iwasaki (2024) Which distribution to choose for deriving a species sensitivity distribution? Implications from analysis of acute and chronic ecotoxicity data. Ecotoxicology and Environmental Safety. 278, 116379. Link (accepted Apr 2024, officially published June 2024; M. Yanagihara and Y. Iwasaki are the corresponding authors). Open access GitHub

23. Momo Takada, Eriko Minari, Shinji Matsumoto, Yuichi Iwasaki, Kaoru Suzuki, Tetsuo Yasutaka (2024) Important factors for the public’s acceptance of the volume reduction of radioactively contaminated soil and wastes resulting from the Fukushima Daiichi nuclear power station accident. Journal of the Society for Remediation of Radioactive Contamination in the Environment. 12(1), 3–13. in Japanese with English abstract. Link (accepted Apr 2024; officially published May 2024)

24. Yuichi Iwasaki, Tomomi Suemori, Yuta Kobayashi (2024) Predicting macroinvertebrate average score per taxon (ASPT) at water quality monitoring sites in Japanese rivers. Environmental Science and Pollution Research. 31(19), 28538–28548 Link (accepted Mar 2024; officially published Apr 2024).  Preprint PostPrint MAP

25. Michio Murakami, Kyoko Ono, Tomoya Inoue, Yoshitaka Nishikawa, Naoya Kojima, Yuichi Iwasaki, Yusuke Hirai, Kenkichi Fujii, Takashi Nagai (2024) Cross-border Impacts of the Risk Governance: A Regulatory Science Perspective. Japanese Journal of Risk Analysis, 33(4), 155-165. Link. in Japanese with English abstract. (accepted Dec 2023, published Mar 2024) Open access

26. Yuichi Iwasaki, Teppei Sudo, Naohide Shinohara (2024) Assessment of water quality and macroinvertebrates at sites upstream and downstream of the inflow of treated mine drainage: A case study of Yoshino legacy mine. Japanese Journal of Environmental Toxicology. 27, 1–8. Link. in Japanese with English abstract. (accepted Jan 2024, published Feb 2024) Open access

27. Toyohiko Nakakubo, Midori Kawabata, Yuriko Ishikawa, Yuichi Iwasaki (2023) Modeling the effect of improved sewage disposal rates on ecological status for aquatic organisms in Japan. Heliyon. 9(11): e20943 Link (accepted Oct 2023, officially published Nov 2023). Open access.

28. Yuichi Iwasaki, Kazutaka M. Takeshita, Koji Ueda, Wataru Naito (2023) Estimating species sensitivity distributions for microplastics by quantitatively considering particle characteristics using a recently created ecotoxicity database. Microplastics and Nanoplastics. 3: 21. Link (accepted Aug 2023, officially published Oct 2023). Open access.

29. The sub-committee for research and proposition, The committee for ecosystem management, The Ecological Society of Japan, Takaaki Nsihida, Yuichi Iwasaki, Takafumi Ohsawa, Shogo Ogasawara, Mahito Kamada, Akiharu Sasaki, Shinichi Takagawa, Noriko Takamura, Futoshi Nakamura, Tohru Nakashizuka, Jun Nishihiro, Naoya Furuta, Hiroyuki Matsuda, and Takehito Yoshida (2023) Towards the wise use of nature: Ecological perspectives on promoting green-infrastructure and nature-based solutions.  Japanese Journal of Conservation Ecology. 28(1), 2211. in Japanese. Open access Link (accepted Oct. 2022, officially published Sep. 2023).

30. Susumu Norota*, Yuichi Iwasaki*, Tagiru Ogino (2023) Long-term changes in water quality of mine drainage and downstream rivers at the Shojingawa Mine in Hokkaido, Japan: Insights on future water quality monitoring. Journal of MMIJ. 139(4-8): 21–28. Link. in Japanese with English abstract. (accepted April 2023, officially published Aug 2023; *These authors contributed equally to this work). Open access

31. Kazutaka M. Takeshita, Yuichi Iwasaki (2023) Application of a Bayesian structural time series model for evaluating eleven-year variation in pH in the headwaters of the Tama River, Japan. Limnology. 24(3): 227–234. Link (accepted Apr 2023, officially published Aug 2023).

32. Yuichi Iwasaki, Hiroyuki Mano, Naohide Shinohara (2023) Linking levels of trace-metal concentrations and ambient toxicity to cladocerans to levels of effects on macroinvertebrate communities. Environmental Advances. 11:100348. Link (accepted Jan 2023, officially published April 2023). Open access 

33. Masashi Kamo, Takehiko I. Hayashi, Yuichi Iwasaki (2022) Revisiting assessment factors for species sensitivity distributions as a function of sample size and variation in species sensitivity. Ecotoxicology and Environmental Safety. 246: 114170. Link (accepted Oct 2022, officially published Nov 2022).  Open access GitHub site for AF calculation

34. Yuichi Iwasaki, Yuta Kobayashi, Tomomi Suemori, Kazutaka M. Takeshita, Masahiro Ryo (2022) Compiling physicochemical characteristics of water quality monitoring sites (environmental reference points) in Japanese rivers and site grouping.  Journal of Japan Society on Water Environment (Survey paper). 45(5), 231–237. in Japanese with English abstract. Link (accepted June 2022; officially published September 2022) Open access 

35. Miina Yanagihara, Kyoshiro Hiki, Yuichi Iwasaki (2022) Can chemical toxicity in saltwater be predicted from toxicity in freshwater? A comprehensive evaluation using species sensitivity distributions. Environmental Toxicology and Chemistry. 41(8): 2021–2027. Link (accepted Apr 2022, officially published August 2022; Y. Iwasaki is the corresponding author). Open access. Top Downloaded Article

36. Tetsuo Yasutaka, Michio Murakami, Yuichi Iwasaki, Wataru Naito, Masaki Onishi, Tsukasa Fujita, SeiyaImoto (2022) Assessment of COVID-19 risk and prevention effectiveness among spectators of mass gathering events. 21: 100215. Link (accepted March 2022, officially published August 2022) Open access

37. Yuichi Iwasaki, Pete Cadmus, James Ranville, William H. Clements (2022) Stream mesocosm experiments show no protective effects of calcium on copper toxicity to macroinvertebrates. Environmental Toxicology and Chemistry. 41(5): 1304–1310. Link (accepted Feb 2022, officially published May 2022) Open access

38. Kazutaka M. Takeshita, Yuichi Iwasaki, Thomas M. Sinclair, Takehiko I. Hayashi, and Wataru Naito (2022) Illustrating a species sensitivity distribution for nano- and microplastic particles by using Bayesian hierarchical modeling. Environmental Toxicology and Chemistry. 41(4): 954–960. Link (accepted Jan 2022, officially published Apr 2022; Y. Iwasaki is the corresponding author) Open access Exceptional Papers of 2022

39. Hiroyuki Mano*, Yuichi Iwasaki, Naohide Shinohara (2022) Effect-based water quality assessment of rivers receiving discharges from legacy mines by using acute and chronic bioassays with two cladoceran species. Water Supply. 22(4): 3603–3616. Link (accepted Dec 2021, officially published Apr 2022) Open access

40. Yuichi Iwasaki, Michihiro Murata, Tomoya Kawaguchi, Shinji Matsumoto, Tetsuo Yasutaka (2022) Do metal concentrations at water quality monitoring river sites downstream of legacy mines meet environmental quality standards if untreated mine drainages are discharged? Screening-level assessment based on a simple dilution approach. Journal of MMIJ. 138(3): 28–32. Link. in Japanese with English abstract. (accepted Jan 2022, officially published Mar 2022). Open access

41. Kyoshiro Hiki, Yuichi Iwasaki, Haruna Watanabe, Hiroshi Yamamoto (2022) Comparison of species sensitivity distributions for sediment-associated nonionic organic chemicals through equilibrium partitioning theory and spiked-sediment toxicity tests with invertebrates. Environmental Toxicology and Chemistry. 41(2): 462–473. Link (accepted Dec 2021, officially published Feb 2022) Open access

42. Naohide Shinohara, Jun Sakaguchi, Hoon Kim, Naoki Kagi, Koichi, Tatsu Hiroyuki Mano, Yuichi Iwasaki, Wataru Naito (2021) Survey of air exchange rates and evaluation of airborne infection risk of COVID-19 on commuter trains. Environment International 157, 106774. Link (accepted July 2021, officially published Dec 2021).

43. Michio Murakami, Fuminari Miura, Masaaki Kitajima, Kenkichi Fujii, Tetsuo Yasutaka, Yuichi Iwasaki, Kyoko Ono, Yuzo Shimazu, Sumire Sorano, Tomoaki Okuda, Akihiko Ozaki, Kotoe Katayama, Yoshitaka Nishikawa, Yurie Kobashi, Toyoaki Sawano, Toshiki Abe, Masaya M. Saito, Masaharu Tsubokura, Wataru Naito, Seiya Imoto (2021) COVID-19 risk assessment at the opening ceremony of the Tokyo 2020 Olympic Games. Microbial Risk Analysis. 19: 100162. Link (accepted March 2021, officially published Dec 2021) Open access

44. Kyoshiro Hiki, Kenta Asahina, Kota Kato, Takahiro Yamagishi, Ryo Omagari, Yuichi Iwasaki, Haruna Watanabe, and Hiroshi Yamamoto (2021) Acute toxicity of a tire-rubber derived chemical, 6PPD quinone, to freshwater fish and crustacean species. Environmental Science & Technology Letters 8(9): 779–784. Link. (accepted Aug 2021; published Sep 2021)

45. Yuichi Iwasaki*, Keiichi Fukaya*, Shigeshi Fuchida, Shinji Matsumoto, Daisuke Araoka, Chiharu Tokoro, and Tetsuo Yasutaka (2021) Projecting future changes in element concentrations of approximately 100 untreated discharges from legacy mines in Japan by a hierarchical log-linear model. Science of the Total Environment. 786, 147500. Link  (accepted Apr 2021; officially published Sep 2021; *These authors contributed equally to this work) Open access

46. Yuichi Iwasaki, Hiroyuki Mano, Bin-Le Lin, Wataru Naito (2021) Current status and issues of hazard assessments focusing on the effects of microplastic particles on aquatic organisms. Japanese Journal of Environmental Toxicology. 24:53–61. Link. in Japanese with English abstract. (accepted July 2021, published Aug 2021) Open access

47. Hiroyuki Kagawa, Yuichi Iwasaki, Hiroshi Kimura, Hironobu Inukai, Keiichi Sasaki, Rui Yasuda, Tetsuo Yasutaka, Saburo Yamagata, Yuji Kawamura (2021) Longitudinal variations in macroinvertebrate and periphyton communities in a mountain stream receiving mine drainage: Are their changes in response to the metal contamination different? Journal of Japan Society on Water Environment (Survey paper). 44(4), 115–124. in Japanese with English abstract. Link (accepted Apr 2021; officially published July 2021; Y. Iwasaki is the corresponding author) Open access

48. Yuichi Iwasaki, Masashi Kamo (2021) Importance of recognizing the limitations of predicted no effect concentrations based on the lowest toxicity value and uncertainty factors.  Japanese Journal of Environmental Toxicology. 24:43–47. Link in Japanese. (accepted Apr 2021, published May 2021) Open access

49. Yuichi Iwasaki, Kiyan Sorgog (2021) Estimating species sensitivity distributions on the basis of readily obtainable descriptors and toxicity data for three species of algae, crustaceans, and fish. PeerJ. 9:e10981. Link (accepted Jan 2021, officially published Mar 2021). Open access

50. Hiroki Namba*, Yuichi Iwasaki*, Kentaro Morita, Tagiru Ogino, Hiroyuki Mano, Naohide Shinohara, Tetsuo Yasutaka, Hiroyuki Matsuda, Masashi Kamo (2021) Comparing impacts of metal contamination on macroinvertebrate and fish assemblages in a northern Japanese river. PeerJ. 9:e10808. Link (accepted Dec 2020, officially published Jan 2021; *These authors contributed equally to this work; Y. Iwasaki is the corresponding author) Open access

51. Yuichi Iwasaki, Nancy W. Shappell (2021) Some papers are hard to follow: why is that, and how can we improve? Integrated Environmental Assessment and Management. 17(1), 305–306 [appeared in Debates, Dilemmas, and Discoveries (3D, formerly Learned Discourses): not peer reviewed but reviewed and approved by the section editors].  Link. Self-archive version.

52. Yukie Shibata, Yuichi Iwasaki, Shion Takemura, Tetsuo Yasutaka, Toru Takahashi, Hiroyuki Matsuda (2020) Analyzing annual newsletters of local association for protection of Waga river: Water quality monitoring for closed mines and long-term changes in related topics in newsletters. Journal of Japan Society on Water Environment (Survey paper). 43 (6), 183–188. in Japanese with English abstract. Link (accepted Aug 2020; officially published Nov 2020; Y. Iwasaki is the corresponding author) Open access

53. Kyoshiro Hiki, Yuichi Iwasaki (2020) Can we reasonably predict chronic species sensitivity distributions from acute species sensitivity distributions?  Environmental Science & Technology. 54(20): 13131–13136. Link. (accepted Sep 2020; published Oct 2020; Y. Iwasaki is the corresponding author) Open access

54. Hiroki Namba*, Yuichi Iwasaki*, Jani Heino, Hiroyuki Matsuda (2020) What to survey? A systematic review of the choice of biological groups in assessing ecological impacts of metals in running waters. Environmental Toxicology and Chemistry. 39(10): 1964–1972. Link (accepted June 2020, officially published Oct 2020; *These authors contributed equally to this work; Y. Iwasaki is the corresponding author). Self-archived version. Open access

55. Bing Gong, Erkai He, Willie J.G.M. Peijnenburg, Yuichi Iwasaki, Cornelis A.M. Van Gestel, Xinde Cao, Ling Zhao, Xiaoyun Xu, Hao Qiu (2020) Coupling mixture reference models with DGT-perceived metal flux for deciphering the nonadditive effects of rare earth mixtures to wheat in soils. Environmental Research. 188: 109736. Link (accepted May 2020, officially published Sep 2020)

56. Kyoshiro Hiki, Haruna Watanabe, Takehiko I. Hayashi, Yuichi Iwasaki, Hiroshi Yamamoto (2020) A gentle introduction to adverse outcome pathway studies in environmental toxicology. Japanese Journal of Environmental Toxicology. 23(1):22–37. Link in Japanese with English abstract. (accepted Feb 2020, published July 2020) Open access

57. Yuichi Iwasaki, Takehiko I. Hayashi (2020) Concerns about reproducibility, use of the Akaike information criterion, and related issues in Hoondert et al. 2019. Environmental Toxicology and Chemistry. 39(7): 1300–1301. Letter to Editor. Link (accepted Mar 2020, officially published July 2020). Self archived version

58. Yuichi Iwasaki, Megumi Fujisawa, Tagiru Ogino, Hiroyuki Mano, Naohide Shinohara, Shigeki Masunaga, and Masashi Kamo (2020) Does a sum of toxic units exceeding 1 imply adverse impacts on macroinvertebrate assemblages? A field study in a Northern Japanese river receiving treated mine discharge. Environmental Monitoring and Assessment. 192(2): 83. Link  (accepted Dec 2019, officially published Feb 2020)

59. Yasunori Yamashita, Yuichi Iwasaki, Toshimitsu Matsubara, Kyuma Suzuki, Yuhei Kanzawa, Takehiro Okuda, Kazuya Nishina, and Carlos Augusto Strüssmann (2020) Comparison of survival rates between domesticated and semi-native char using Bayesian multi-variate state-space model. Fisheries Research. 221, 105380. Link  (accepted Sep 2019; officially published Jan 2020)

60. Shingo Fujimoto, Takashi Nagai, Yuichi Iwasaki, and Masashi Kamo (2019) Predicting population level impacts of 4-nonylphenol based on Medaka Extended One-Generation Reproduction Test (MEOGRT). Japanese Journal of Environmental Toxicology. 22(1): 1–11. in Japanese with English abstract. (accepted May 2019, published Dec 2019) Open access

61. Yuichi Iwasaki, Hiroshi Honda, Tohru Nishioka, Yuriko Ishikawa, and Masayuki Yamane (2019) Characteristics of river sites with elevated concentrations of linear alkylbenzene sulfonate: Implications for water environmental management for protection of aquatic life. Journal of Japan Society on Water Environment (Note). 42 (5), 201–206.in Japanese with English abstract. Link (accepted June 2019; ; officially published Sep 2019) Open access

62. Tohru Nishioka, Yuichi Iwasaki, Yuriko Ishikawa, Masayuki Yamane, Osamu Morita, and Hiroshi Honda (2019) Validation of AIST-SHANEL Model based on spatiotemporally-extensive monitoring data of linear alkylbenzene sulfonate in Japan: Toward a better strategy on deriving predicted environmental concentrations. Integrated Environmental Assessment and Management. 15(5): 750–759 Link. (accepted May 2019; officially published Sep 2019) Open access

63. Kyoko Ono, Tetsuo Yasutaka, Takehiko I. Hayashi, Masashi Kamo, Yuichi Iwasaki, Taizo Nakamori, Yoshikazu Fujii, Takafumi Kamitani (2019) Model construction for estimating potential vulnerability of Japanese soils to cadmium pollution based on intact soil properties. PLoS ONE 14(6): e0218377. Link. (accepted and published June 2019) Open access

64. Yusuke Oda, Masaki Sakamoto, Yuichi Iwasaki, Seiji Nagasaka, Jin-Yong Ha, Kwang-Hyeon Chang, and Shosaku Kashiwada (2019) Inter-clonal variation in copper sensitivity in Bosmina longirostris with different exposure histories. Water, Air, & Soil Pollution. 230:109 Link. (accepted Apr 2019; officially published May 2019) 

65. Masashi Kamo, Yuichi Iwasaki, and Hiroyuki Yokomizo (2019) Much ado about interaction: A combination of linear processes yields non-linear toxic effects in chemical mixtures. Chemosphere. 219:89–94 Link. (accepted Nov 2018; officially published Mar 2019) 

66. Momo Kurihara, Yuichi Onda, Hiroyuki Suzuki, Yuichi Iwasaki, Tetsuo Yasutaka (2018) Spatial and temporal variation in vertical migration of dissolved 137Cs passed through the litter layer in Fukushima forests. Journal of Environmental Radioactivity. 192: 1–9. Link. (accepted May 2018, officially published Dec 2018) Open access

67. Yuichi Iwasaki, Takashi Kagaya, and Hiroyuki Matsuda (2018) Comparing macroinvertebrate assemblages at organic-contaminated river sites with different zinc concentrations: metal-sensitive taxa may already be absent. Environmental Pollution. 241: 272–278. Link. (accepted May 2018, officially published Oct 2018)

68. Masahiro Ryo, Chihiro Yoshimura, Yuichi Iwasaki. (2018) Importance of antecedent environmental conditions in modeling species distributions. Ecography. 41(5): 825–836. Link (accepted June 2017, published May 2018)

69. Kyuma Suzuki, Shun Watanabe, Yumi Yuasa, Yasunori Yamashita, Hajime Arai, Hideki Tanaka, Toshihiro Kuge, Masanobu Mori, Kin-ichi Tsunoda, Seiichi Nohara, Yuichi Iwasaki, Yoshitaka Minai, Yukiko Okada, and Seiya Nagao (2018) Radiocesium dynamics in the aquatic ecosystem of Lake Onuma on Mt. Akagi following the Fukushima Dai-ichi Nuclear Power Plant accident. Science of the Total Environment. 622–623: 1153–1164. Link.(accepted Dec 2017; published May 2018)

70. Yuichi Iwasaki, Travis Schmidt, William H. Clements (2018) Quantifying differences in responses of aquatic insects to trace metal exposure in field studies and short-term stream mesocosm experiments. Environmental Science & Technology. 52(7): 4378–4384. Link. (accepted Mar 2018; published April 2018)

71. Yuichi Iwasaki, Masahiro Soya, Masaki Takasu, Yasuyuki Zushi, Takehiko I. Hayashi, and Shosaku Kashiwada (2018) Spatiotemporal changes in water quality along a historically metal-contaminated river: a retrospective analysis of 50 years of monthly monitoring data. Limnology. 19(1): 157–163. Link Free online view (accepted June 2017, published Jan 2018) 

72. Yuichi Iwasaki, Marko Jusup, Ken-ichi Shibata, Takashi Nagai, and Shosaku Kashiwada (2018) Lower sensitivity of cyprinid fishes to three acetylcholinesterase inhibitor pesticides: an evaluation based on no-effect concentrations. Limnology. 19(1): 1–5 Link Free PDF Free online view (accepted April 2017, published Jan 2018)

73. Satoko Tamai, Yuichi Iwasaki*, Makoto Ishimota, and Shosaku Kashiwada (2017) Generalized linear models for statistical analysis of binary data: Time to get rid of using fraction. Japanese Journal of Environmental Toxicology. 20(2): 51–58. in Japanese with English abstract. Review article (Dec 2017; * = corresponding author) 

74. Michio Murakami, Mahua Saha, Yuichi Iwasaki, Rei Yamashita, Yukio Koibuchi, Hirofumi Tsukada, Hideshige Takada, Keisuke Sueki, Tetsuo Yasutaka (2017) Source analysis of radiocesium in river waters using road dust tracers. Chemosphere. 187: 212–220. Link (Nov 2017)

75. Yuichi Iwasaki (2017) More practical and gentler guides are required for non-mathematicians in ecotoxicology and beyond: Comment on “Physics of metabolic organization” by Marko Jusup et al. Physics of Life Reviews. 20: 52–53. Link  (2017.3)

76. Masashi Kamo, and Yuichi Iwasaki (2016) Comparison of predicted no effect concentrations (PNECs) derived by using assessment factor and species sensitivity distribution methods. Japanese Journal of Environmental Toxicology. 19(1): 47–58.in Japanese with English abstract. Open access

77. Tsuyoshi Kawaue, Taizo Nakamori, Yuichi Iwasaki, and Mikhail Potapov (2016) Comparison of sampling methods for Collembola on a cobble-dominated riverbank. Edaphologia. 98, 21–27. Short communication Link.

78. Yuichi Iwasaki. (2016) Estimating “safe” concentrations of metals from responses of biological communities: What field survey can provide for ecological risk assessments. Japanese Journal of Ecology. 66, 81–90. in Japanese. Open access

79. Masahiro Ryo, Chhiro Yoshimura, and Yuichi Iwasaki. (2016) Evaluation of relative importance of various environmental factors influencing population variability of riverine fishes based on reproduction timings. Journal of Japan Society of Civil Engineers, Ser. B1, 72(4) I_450–I_455. in Japanese with English abstract (2016.2)

80. Yuichi Iwasaki*, and Patrick Gauthier* (2016) Concentration addition and response addition to analyze mixture toxicity: is it worth testing? Environmental Toxicology and Chemistry. 35(3): 526–527. Link.  "Letter to the Editor" article (* Both authors contributed equally and agree with the author sequence)

81. Takehiro Sasaki*, Takuya Furukawa*, Yuichi Iwasaki, Mayumi Seto, Akira S. Mori (2015) Perspectives for ecosystem management based on ecosystem resilience and ecological thresholds against multiple and stochastic disturbances. Ecological Indicators. 57: 395–408 (* equal contribution) Link (2015.10)

82. Yuichi Iwasaki, Kensuke Kotani, Shosaku Kashiwada, Shigeki Masunaga (2015) Does the choice of NOEC or EC10 affect the hazardous concentration for 5% of the species? Environmental Science & Technology. 49(15): 9326–9330. Link. (2015.8)

83. Masahiro Ryo, Yuichi Iwasaki, Chihiro Yoshimura, Oliver C. V. Saavedra (2015) Evaluation of spatial pattern of altered flow regimes on a river network using a distributed hydrological model. PLoS ONE 10(7): e0133833. Link. (2015.7.24) Open access

84. Yuichi Iwasaki, and William H. Clements (2015) A continuous need to determine what we should protect in ecological risk assessments. Environmental Science & Technology. 49(13): 7520–7521. Link "Viewpoint" article [Not peer reviewed but reviewed by members of the editorial team] (2015.7.7)

85. Yuichi Iwasaki (2015) A need to keep asking what we should protect in ecological risk assessments. Japanese Journal of Environmental Toxicology. 18(1): 39–42. in Japanese.

86. Rei Yamashita, Michio Murakami, Yuichi Iwasaki, Nao Shibayama, Keisuke Sueki, Mahua Saha, Goro Mouri, Soulichan Lamxay, Haechong O, Yukio Koibuchi, and Hideshige Takada (2015) Temporal variation and source analysis of radiocesium in an urban river after the 2011 nuclear accident in Fukushima, Japan. Journal of Water and Environment Technology. 13(2): 179–194. Link

87. Yuichi Iwasaki and Stephen F. Brinkman (2015) Application of generalized linear mixed model to analyze mixture toxicity: survival of brown trout affected by copper and zinc. Environmental Toxicology and Chemistry. 34(4): 816–820 Link

88. Yuichi Iwasaki, Masashi Kamo and Wataru Naito (2015) Testing an application of a biotic ligand model to predict acute toxicity of metal mixtures to rainbow trout. Environmental Toxicology and Chemistry. 34(4): 754–760 Link

89. Kevin J. Farley, Joseph S. Meyer, Laurie S. Balistrieri, Karel A. C. De Schamphelaere, Yuichi Iwasaki, Colin R. Janssen, Masashi Kamo, Stephen Lofts, Christopher A. Mebane, Wataru Naito, Adam C. Ryan, Robert C. Santore, and Edward Tipping (2015) Metal mixture modeling evaluation project: 2. Comparison of four modeling approaches. Environmental Toxicology and Chemistry. 34(4): 741–753 Link

90. Sayaka Yoshikawa, Aki Yanagawa, Yuichi Iwasaki, Pengzhe Sui, Sujan Koirala, Anupam Khajuria, Kazunari Hirano, Roobavannan Mahendran, Yukiko Hirabayashi, Chihiro Yoshimura, and Shinjiro Kanae (2014) Illustrating a new approach to estimating potential reduction in fish species richness due to flow alteration on a global scale. Hydrology and Earth System Sciences. 18(2): 621–630. Link 

91. Yuichi Iwasaki, Takehiko I. Hayashi and Takashi Nagai (2013) Time to say goodbye to NOEC and LOEC. Japanese Journal of Environmental Toxicology. 16(1): 13–19. in Japanese.

92. Yuichi Iwasaki, Takehiko I. Hayashi and Masashi Kamo (2013) Estimating population-level HC5 for copper using a species sensitivity distribution approach. Environmental Toxicology and Chemistry. 32 (6), 1396–1402. Link

93. Yuichi Iwasaki, Pete Cadmus and William H. Clements (2013) Comparison of different predictors of exposure for modeling impacts of metal mixtures on macroinvertebrates in stream microcosms. Aquatic Toxicology. 132–133, 151–156. Link (2013) How to WHAM-HA.

94. Yuichi Iwasaki and Niklas Hanson (2013) Using population level consequences as a basis for determining the “x” in ECx for toxicity testing. Integrated Environmental Assessment and Management. 9(2), 344–345. [appeared in Learned Discourses: Timely Scientific Opinions: not peer reviewed but reviewed by the section editor (PMC) for clarity, consistency, and brevity]. Link Self-archive version (April, 2013)

95. Yuichi Iwasaki, Takashi Kagaya and Steve J. Ormerod (2013) Field surveys can support ecological risk assessment. Integrated Environmental Assessment and Management. 9(1), 171–172 [appeared in Learned Discourses: Timely Scientific Opinions: not peer reviewed but reviewed by the section editor (PMC) for clarity, consistency, and brevity].  Link. Self-archive version.

96. Yuichi Iwasaki, Tetsuya Akita, Masashi Kamo (2012) Application of an age-structured population model of bluegill sunfish (Lepomis macrochirus): Implications for the control measures in Japan. Ecology and Civil Engineering 15(2), 207–212. in Japanese with English abstract.

97. Yuichi Iwasaki, Masahiro Ryo, Pengzhe Sui, and Chihiro Yoshimura (2012) Evaluating the relationship between basin-scale fish species richness and ecologically relevant flow characteristics in rivers worldwide. Freshwater Biology. 57(10), 2173–2180. Link  Notes.

98. Yuichi Iwasaki and Steve J. Ormerod (2012) Estimating safe concentrations of trace metals from inter-continental field data on river macroinvertebrates. Environmental Pollution. 166, 182–186. Link. shortlisted for Science for Environment Policy News Alert (here) 

99. Yuichi Iwasaki, Takashi Kagaya, Ken-ichi Miyamoto, and Hiroyuki Matsuda (2012) Responses of riverine macroinvertebrates to zinc in natural streams: implications for the Japanese water quality standard. Water, Air, & Soil Pollution. 223(1), 145–158. Link

100. Yuichi Iwasaki (2011) Exploring safe concentrations of zinc for protecting riverine macroinvertebrates with a review on effects of heavy metals. Japanese Journal of Environmental Toxicology. 14(1): 47–56. in Japanese with English abstract.

101. Yuichi Iwasaki, Takashi Kagaya, Ken-ichi Miyamoto, Hiroyuki Matsuda and Mayu Sakakibara (2011) Effect of zinc on diversity of riverine benthic macroinvertebrates: Estimation of safe concentrations from field data. Environmental Toxicology and Chemistry. 30(10), 2237–2243. Link

102. Wataru Naito, Miwako Mori, Yuichi Iwasaki, Masashi Kamo and Shigeki Masunaga (2011) Measurements of Bioavailability of Metals in River Water Using DGT. Journal of Japan Society on Water Environment 34(4):65-71. in Japanese with English abstract. Link

103. Yuichi Iwasaki (2011) Decision making for ecological risk management of zinc. Japanese Journal of Risk Analysis. 21(1), 7–13.  in Japanese with English abstract.

104. Masahiro Ryo, Yuichi Iwasaki and Chihiro Yoshimura (2011) Evaluating flow characteristics and their relation to fish species richness in world rivers. Annual journal of hydraulic engineering. 55, S_1459–S_1464. in Japanese with English abstract.

105. Wataru Naito, Masashi Kamo, Tsushima Kouji, and Yuichi Iwasaki  (2010) Exposure and risk assessment of zinc in Japanese surface waters. Science of the Total Environment. 408 (20), 4271–4284. Link

106. Takehiko I. Hayashi, Yuichi Iwasaki and Yoshikazu Fujii (2010) The past, present and future of ecological risk assessment of chemicals. Japanese Journal of Ecology. 60, 327–336. in Japanese.

107. Yuichi Iwasaki, Takehiko I. Hayashi and Masashi Kamo (2010) Comparison of population-level effects of heavy metals on fathead minnow (Pimephales promelas). Ecotoxicology and Environmental Safety. 73 (4), 465–471. selected as "Highlighted Article" Link -- ScienceDirect TOP25 Hottest Articles in EES (April to June 2010)

108. Yuichi Iwasaki, Takashi Kagaya, Ken-ichi Miyamoto, and Hiroyuki Matsuda (2009) Changes in Riverine Macroinvertebrate Assemblages after Discharge of Treated Mine Wastewater: A Case Study on Ikuno Silver Mine. Journal of Japan Society on Water Environment (Survey Report). 32 (6), 325–329.  in Japanese with English abstract. Link

109. Yuichi Iwasaki, Hiroki Oikawa (2009) Issues on environmental and effluent standards for zinc: ecological and practical implications. Environmental Science (Symposium Paper, Society of Environmental Science, Japan). 22 (3), 196–203.  in Japanese with English abstract.

110. Yuichi Iwasaki, Takashi Kagaya, Ken-ichi Miyamoto, and Hiroyuki Matsuda (2009)  Effects of heavy metals on riverine benthic macroinvertebrate assemblages with reference to potential food availability for drift-feeding fishes. Environmental Toxicology and Chemistry. 28 (2): 354–363  Link erratum

Non-refereed articles

1. Yuichi Iwasaki (2017) A journey to estimating "safe" concentrations of trace metals based on macroinvertebrate field surveys in rivers. Japanese Journal of Pesticide Science. 42(1): 127–132. in Japanese Link (2017.3)

2. Masahi Kamo, Yuichi Iwasaki (2016) Ecological risk assessment of metals: What we have done and will do. Japanese Journal of Environmental Toxicology. 16(2): 59–68. in Japanese

Reviewer: See Publon

Editor for  

Water, Air, & Soil Pollution (Associate Editor, 2024/6-2024/12).
Limnology (Associate Editor, 2017/1-2022/12).

Selected presentations at international conferences

1. Noriko Uchida, Yuichi Iwasaki, Ryoichi Kuranishi, Natsuko Kondo (2024) Is environmental DNA-based assessment effective in the upstream-downstream comparison of macroinvertebrate communities in a metal-contaminated river? SETAC North America 45th Annual Meeting (Fort Worth, US), 2024/10/23, Poster (YI is the presenter).

2. Yuichi Iwasaki, Miina Yanagihara, Kyoshiro Hiki, and  Masashi Kamo (2024)A ddressing fundamental questions in estimating species sensitivity distributions. SETAC North America 45th Annual Meeting (Fort Worth, US), 2024/10/22, Poster (YI is the presenter).

3. Hiroki Namba, Yuichi Iwasaki*, Jani Heino, and Hiroyuki Matsuda (2020) What to survey? a systematic review of the choice of biological groups in assessing ecological impacts of metals in running waters. SETAC North America 41st Annual Meeting (Virtual), 2020/11/15-19, Oral (YI is the speaker).

4. Kiyan Sorgog, and Yuichi Iwasaki (2020) Developing models to estimate acute species sensitivity distributions using ecotoxicity data for three species. SETAC North America 41st Annual Meeting (Virtual), 2020/11/15-19 Poster

5. Hiki Kyoshiro, and Yuichi Iwasaki (2020) Can we reasonably predict chronic species sensitivity distributions from acute species sensitivity distributions? SETAC North America 41st Annual Meeting (Virtual), 2020/11/15-19 Poster

6. Yuichi Iwasaki, Hiroki Namba, Kentaro Morita, Tagiru Ogino, Hiroyuki Mano, Naohide Shinohara, Hiroyuki Matsuda, and Masashi Kamo (2019) How protective is protective enough? A field study of metal impacts on river macroinvertebrate and fish assemblages. Society of Environmental Toxicology and Chemistry Australasian Chapter Conference (Darwin, Australia) 2019/0X/XX Poster

7. Yuichi Iwasaki, Hiroki Namba, Kentaro Morita, Tagiru Ogino, Hiroyuki Mano, Naohide Shinohara, Hiroyuki Matsuda, and Masashi Kamo (2019)  Does a sum of toxic units exceeding 1.0 imply any ecological effects? A field study of metal impacts on river macroinvertebrate and fish assemblages. SETAC Europe 29th Annual Meeting (Helsinki, Finland) 2019/5/28 Poster. 

8. Yuichi Iwasaki, Travis Schmidt, and William H. Clements (2018) Comparing relative sensitivities of aquatic insects to trace metal exposure in field studies and short-term stream mesocosm experiments. 2018 Society for Freshwater Science Annual Meeting (Detroit, USA) 2018/5/23 Oral.  

9. Yuichi Iwasaki, Takashi Kagaya, and Hiroyuki Mastuda (2017) Comparison of macroinvertebrate communities at organic-polluted river sites with different zinc concentrations: Is single-chemical regulation worth it? SETAC North America Focused Topic Meeting on "Risk Assessment of Chemical Mixtures: From Scientific Evidence to Environmental Regulation" (Denver, USA) 2017/9/7 Poster

10. Yuichi Iwasaki, Satoru Furui, Hideaki Tomiyama, Daiki Kitamura, Haruki Tatsuta, and Shosaku Kashiwada (2016) Observed lower tissue residues of metals in Japanese dace collected from a metal contaminated river. 7th SETAC World Congress/SETAC North America 37th Annual Meeting. (Orlando, USA) 2016/11/8 Poster

11. Yuichi Iwasaki, Marko Jusup, Kenichi Shibata, Takashi Nagai, and Shosaku Kashiwada (2016) Lower sensitivity of cyprinid fishes to three acetylcholinesterase inhibitor pesticides: an evaluation based on no effect concentrations. 7th SETAC World Congress/SETAC North America 37th Annual Meeting. (Orlando, USA). 2016/11/7 Poster

12. Shosaku Kashiwada, Chisato Kataoka, Daiki Kitamura, Hideaki Tomiyama, Masahiro Soya, Satoru Furui, Shohei Ohta, Yasuyuki Zushi, Takehiko Hayashi, Haruki Tatsuta, Seiji Nagasaka, Yuichi Iwasaki (2016) Spatio-temporal analyses of 100-Year heavy metals pollution in the Watarase River and biological responses of Japanese dace, Tribolodon hakonensis. 18th International Conference on Heavy Metals in the Environment (ICHMET2016) (Ghent, Belgium). 2016.9/14 Oral

13. Yuichi Iwasaki, Keisuke Kotani, Shosaku Kashiwada, and Shigeki Masunaga (2015) Does the choice of NOEC or EC10 affect consequences of ecological risk assessments? SETAC Europe 25th Annual Meeting (Barcelona, Spain). 2015/05/04 Poster (Session title: Impact of statistical methods used in ecotoxicological studies on regulatory decisions )

14. Yuichi Iwasaki. and Steve F. Brinkman. (2014) Application of generalized linear mixed model to analyze mixture toxicity: survival of brown trout affected by copper and zinc. SETAC North America 35th Annual Meeting (Vancouver, Canada). 2014/11/13 Oral

15. Joseph S. Meyer and Yuichi Iwasaki. (2014) Statistical tests for additivity of toxicity in Metal Mixtures. SETAC North America 35th Annual Meeting (Vancouver, Canada). 2014/11/13 Oral (not speaker)

16. Yuichi Iwasaki, Pete Cadmus and William H. Clements (2013) Modeling impacts of metal mixtures on macroinvertebrates in stream microcosm experiments: humic acid as a proxy of exposure. SETAC Europe 23rd Annual Meeting (Glasgow, UK). Oral

17. Yuichi Iwasaki, Masashi Kamo (2011) Estimating population-level HC5 for copper. SETAC North America 32nd Annual Meeting (Boston, USA). abstract Poster

18. Yuichi Iwasaki, Steve J. Ormerod (2011) Estimating safe concentrations of four heavy metals (Cu, Zn, Cd, and Mn) from field effects on species richness of riverinemacroinvertebrates. SETAC Europe 21st Annual Meeting (Milan, Italy). abstract Poster

19. Yuichi Iwasaki, Takashi Kagaya, Ken-ichi Miyamoto, and Hiroyuki Matsuda. (2009) The Effect of Zinc on Diversity of Riverine Benthic Macroinvertebrates: Estimation of Thresholds from Field Data. SETAC North America 30th Annual Meeting (New Orleans, USA). Poster

20. Yuichi Iwasaki, Takashi Kagaya, Ken-ichi Miyamoto, and Hiroyuki Matsuda. (2006) Ecological Risk Assessmentof Heavy Metals to Freshwater BenthicMacroinvertebrate Assemblages Based on Field Survey in the Hasama River Basin, Miyagi, Japan. SETAC North America 27th Annual Meeting (Montreal, Canada) Poster