Research Institute for Humanity and Nature

Staff Profile

NameTAYASU Ichiro
AffiliationRIHN Center
Arrival day2014-12-01
Leaving the office day 
Year of Birth1969
Academic CareerDepartment of Zoology, Graduate School of Science, Kyoto University, Doctor Course(1997)
Department of Zoology, Graduate School of Science, Kyoto University, Master Course(1994)
Department of Zoology, Faculty of Science, Kyoto University(1992)
Professional CareerProfessor, RIHN Center, Research Institute for Humanity and Nature (2016)
Professor, Center for Research Promotion, Research Institute for Humanity and Nature (2014)
Associate Professor, Center for Ecological Research, Kyoto University (2003)
Assistant Professor, Research Institute for Humanity and Nature (2002)
Postdoctoral Research Fellow (Research Abroad) of the Japan Society for the Promotion of Science; Laboratoire d'Ecologie des Sols Tropicaux, Institut de Recherche pour le Developpement (2000)
Postdoctoral Research fellow (PD) of the Japan Society for the Promotion of Science; Laboratory of Forest Ecology, Graduate School of Agriculture, Kyoto University, Japan (1997)
Higher DegreesPh.D (Kyoto University, 1997)
M Sc. (Kyoto University, 1994)
Fields of SpecializationIsotope Ecology
Animal Ecology
Freshwater Ecology
Soil Ecology
Isotope Environmental Science
Academic Society MembershipsEcological Society of Japan
The Japanese Society of Limnology
The Japanese Society of Soil Zoology
The International Union for the Study of Social Insects
Japan Geoscience Union
Advancing the Science of Limnology and Oceanography
Awards16th Inoue Research Award for Young Scientists (1999)
20th Biwako Prize for Ecology (2019)
AppealIchiro Tayasu is studying isotope ecology on watersheds (both terrestrial and aquatic ecosystems). I hope to study the earth systems from a point of isotope environmental science.
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Tayasu, I., Shin, K.-C. and Fujiyoshi, L. eds. 2020,03 A world drawn by Environmental Isotope Study: 2020 edition. Research Institute for Humanity and Nature, Kyoto, 100pp. (in Japanese)


Shibata, J.-y, Karube, Z., Sakai, Y., Takeyama, T., Tayasu, I., Yachi, S., Nakano, S.-i. and Okuda, N. 2014,04 Long-Term and Spatial Variation in the Diversity of Littoral Benthic Macroinvertebrate Fauna in Lake Biwa, Japan. Nakano, S.-i.; Yahara, T.; Nakashizuka, T. (ed.) Integrative Observations and Assessments.. Ecological Research Monographs / Asia-Pacific Biodiversity Observation Network. Springer, pp.151-166. DOI:10.1007/978-4-431-54783-9_8


【Original Articles】

Kato, Y., Togashi, H., Kurita, Y., Kamauchi, H. and Tayasu, I 2020,07 Discrimination of nursery locations of juvenile Japanese flounder Paralichthys olivaceus on the Pacific coast of northern Japan based upon carbon and nitrogen stable isotope ratios. Fisheries Science 86:615-623. DOI:10.1007/s12562-020-01436-y (reviewed).

Suetsugu, K, Matsubayashi, J. and Tayasu, I. 2020,07 Use of radiocarbon for assessing the mycorrhizal status of mycoheterotrophic plants. Plant Signaling & Behavior . DOI:10.1080/15592324.2020.1785667 (reviewed).

Ishikawa, N.F., Finlay, J.C., Uno, H., Ogawa, N.O., Ohkouchi, N., Tayasu, I. and Power, M.E. 2020,07 Combined use of radiocarbon and stable carbon isotopes for the source mixing model in a stream food web. Limnology and Oceanography. DOI:10.1002/lno.11541 (reviewed).

Nitzsche, K.N., Shin, K.-C., Kato Y., Kamauchi, H., Takano, S. and Tayasu, I. 2020,07 Magnesium and zinc stable isotopes as a new tool to understand Mg and Zn sources in stream food webs. Ecosphere 11:e03197. DOI:10.1002/ecs2.3197 (reviewed).

Suetsugu, K, Taketomi, S., Tanabe, A.S, Haraguchi, T.F., Tayasu, I. and Toju, H. 2020,04 Isotopic and molecular data support mixotrophy in Ophioglossum at the sporophytic stage. New Phytologist. DOI:10.1111/nph.16534 (reviewed).

Tayasu, I. 2020,04 Environmental Isotope Study and the expansion of the researches on Isoscapes. Transactions of The Research Institute of Oceanography 33:27-31. (in Japanese)

Shutoh, K., Tajima, Y., Matsubayashi, J., Tayasu, I., Kato, S., Shiga, T. and Suetsugu, K. 2020,04 Evidence for newly discovered albino mutants in a pyroloid: implication for the nutritional mode in the genus Pyrola. American Journal of Botany 107:650-657. DOI:10.1002/ajb2.1462 (reviewed).

Ide, J., Ishida, T., Cid-Andres, A.P., Osaka, K., Iwata, T., Hayashi, T., Akashi, M., Tayasu, I., Paytan, A. and Okuda, N. 2020,03 Factors characterizing phosphate oxygen isotope ratios in river water: an inter-watershed comparison approach. Limnology 21:365-377. DOI:10.1007/s10201-020-00610-6 (reviewed).

Matsubayashi, J., Osada, Y., Tadokoro, K., Abe, Y., Yamaguchi, A., Shirai, K., Honda, K., Yoshikawa, C., Ogawa, N.O., Ohkouchi, N., Ishikawa, N.F., Nagata, T., Miyamoto, H., Nishio, S. and Tayasu I. 2020,03 Tracking long-distance migration of marine fishes using compound-specific stable isotope analysis of amino acids. Ecology Letters 23:881-890. DOI:10.1111/ele.13496 (reviewed).

Rupprecht, C.D.D., Fujiyoshi, L., McGreevy, S.R. and Tayasu, I. 2020,02 Trust me? Consumer trust in expert information on food product labels. Food and Chemical Toxicology. DOI:10.1016/j.fct.2020.111170 (reviewed).

Suetsugu, K., Matsubayashi, J. and Tayasu, I. 2020,01 Some mycoheterotrophic orchids depend on carbon from dead wood: Novel evidence from a radiocarbon approach. New Phytologist 227:1519-1529. DOI:10.1111/nph.16409 (reviewed).

Gotou, Y., Koiwa, T., Shin, K.-C. and Tayasu, I. 2019,12 Development of the method for discriminating the geographical origin of okra using elemental analysis and strontium isotope ratio. Research Report of Food Products 43:20-26. (in Japanese)

Katsuta, N., Matsumoto, G.I., Hase, Y., Tayasu, I., Haraguchi, T.F., Tani, E., Shichi, K., Murakami, T., Naito, S., Nakagawa, M., Hasegawa, H. and Kawakami, S.-i. 2019,11 Siberian permafrost thawing accelerated at the Bølling/Allerød and Preboreal warm periods during the last deglaciation. Geophysical Research Letters 46:13961-13971. DOI:10.1029/2019GL084726 (reviewed).

Fujiyoshi, L., Nishimura, T., Kato, T. and Tayasu, I. 2019,11 Residents’ understanding of and interest in isotope techniques for groundwater conservation. Papers on Environmental Information Science 33:133-138. DOI:10.11492/ceispapers.ceis33.0_133 (in Japanese) (reviewed).

Naoe, S., Tayasu, I., Sakai, Y., Masaki, T., Kobayashi, K., Nakajima, A., Sato. Y., Yamazaki, K., Kiyokawa, H. and Koike, S. 2019,10 Downhill seed dispersal by temperate mammals: a potential threat to plant escape from global warming. Scientific Reports 9:14932. DOI:10.1038/s41598-019-51376-6 (reviewed).

Suetsugu, K., Yamato, M., Matsubayashi, J. and Tayasu, I. 2019,07 Comparative study of nutritional mode and mycorrhizal fungi in green and albino variants of Goodyera velutina, an orchid mainly utilizing saprotrophic rhizoctonia. Molecular Ecology 28:4290-4299. DOI:10.1111/mec.15213 (reviewed).

Nitzsche, K.N., Kato Y., Shin, K.-C. and Tayasu, I. 2019,06 Magnesium isotopes reveal bedrock impacts on stream organisms. Science of the Total Environment 688:243-252 . DOI:10.1016/j.scitotenv.2019.06.209 (reviewed).

Igarashi, S., Shibata, M., Masaki, T., Tayasu, I. and Ichie, T. 2019,05 Mass flowering of Fagus crenata does not depend on the amount of stored carbohydrates in trees. Trees 33:1399-1408. DOI:10.1007/s00468-019-01867-w (reviewed).

Matsubayashi, J. and Tayasu, I. 2019,04 Collagen turnover and isotopic records in cortical bone. Journal of Archaeological Science 106:37-44. DOI:10.1016/j.jas.2019.03.010 (reviewed).

Ishida, T., Uehara,Y., Iwata, T., Cid-Andres, A.P., Asano, S., Ikeya, T., Osaka, K., Ide, J., Privaldos, O.L.A, De Jesus, I.B.B., Peralta, E.M.. Triño, E.M.C., Ko, C.-Y., Paytan, A., Tayasu, I. and Okuda, N. 2019,04 Identification of phosphorus sources in a watershed using a phosphate oxygen isoscape approach. Environmental Science and Technology 53(9):4707-4716. DOI:10.1021/acs.est.8b05837 (reviewed).

Ko, C.-Y., Iwata, T., Lee, J.-Y., Murakami, A., Okano, J., Ishikawa, N.F., Sakai, Y., Tayasu, I., Itoh, M., Song, U., Togashi, H., Nakano, S., Ohte, N. and Okuda, N. 2019,03 Assessing alpha and beta diversities of benthic macroinvertebrates and their environmental drivers between watersheds with different levels of habitat transformation in Japan. Marine and Freshwater Research 70(4):504-512. DOI:10.1071/MF18031 (reviewed).

Matsubayashi, J., Umezawa, Y., Matsuyama, M., Kawabe, R., Mei, W., Wan, X., Shimomae, A. and Tayasu, I. 2019,02 Using segmental isotope analysis of teleost fish vertebrae to estimate trophic discrimination factors of bone collagen.. Limnology and Oceanography: Methods 17:87-96. DOI:10.1002/lom3.10298 (reviewed).

Sase, H., Takahashi, M., Matsuda, K., Sato, K., Tanikawa, T., Yamashita, N., Ohizumi, T., Ishida, T., Kamisako, M., Kobayashi, R., Uchiyama, S., Saito, T., Morohashi, M., Fukuhara, H., Kaneko, S., Inoue, T., Yamada, T., Takenaka, C., Tayasu, I., Nakano, T., Hakamata, T. and Ohta, S. 2019,01 Response of river water chemistry to changing atmospheric environment and sulfur dynamics in a forested catchment in central Japan. Biogeochemistry 142:357-374. DOI:10.1007/s10533-019-00540-1 (reviewed).

Tanaka, H.O., Haraguchi, T.F., Tayasu, I. and Hyodo F. 2018,10 Stable and radio-isotopic signatures reveal how the feeding habits of ants respond to natural secondary succession in a cool-temperate forest. Insectes sociaux 66:37-46. DOI:10.1007/s00040-018-0665-0 (reviewed).

Ishikawa, N.F., Chikaraishi, Y., Takano, Y., Sasaki, Y., Takizawa, Y., Tsuchiya, M., Tayasu, I., Nagata. T. and Ohkouchi, N. 2018,09 A new analytical method for determination of the nitrogen isotopic composition of methionine: its application to aquatic ecosystems with mixed resources. Limnology and Oceanography: Methods 16(9):607-620. DOI:10.1002/lom3.10272 (reviewed).

Suetsugu, K., Ohta, T. and Tayasu, I. 2018,08 Partial mycoheterotrophy in the leafless orchid Cymbidium macrorhizon. American Journal of Botany 105(9):1595-1600. DOI:10.1002/ajb2.1142 (reviewed).

Saitoh, Y., Nakano, T., Shin, K-C., Matsubayashi, J., Kato, Y., Amakawa, H., Osada, Y., Yoshimizu, C., Okuda, N., Amano, Y., Togashi, H., Kurita, Y. and Tayasu, I. 2018,08 Utility of Nd isotope ratio as a tracer of marine animals: regional variation in coastal seas and causal factors. Ecosphere 9(8):e02365. DOI:10.1002/ecs2.2365 (reviewed).

Endo, H., Fukuda, H., Takahashi, D., Okumura, Y., Inomata, E., Yoshimizu, C., Tayasu, I. and Nagata, T. 2018,07 Influence of isotope fractionation on the nitrogen isotope composition of the brown macroalga Undaria pinnatifida. Phycological Research 66:262-268. DOI:10.1111/pre.12332 (reviewed).

Kato, Y., Kondoh, M., Ishikawa, N.F., Togashi, H., Kohmatsu, Y., Yoshimura, M., Yoshimizu, C., Haraguchi, T.F., Osada, Y., Ohte, N., Tokuchi, N., Okuda, N., Miki, T. and Tayasu, I. 2018,05 Using food network unfolding to evaluate food-web complexity in terms of biodiversity: theory and applications. Ecology Letters 21:1065-1074. DOI:10.1111/ele.12973 (reviewed).

Sugio, K., Miyaguni , Y. and Tayasu, I. 2018,04 Characteristics of dispersal flight and disperser production in an Asian dry-wood termite, Neotermes koshunensis (Isoptera, Kalotermitidae). Insectes Sociaux 65:323-330. DOI:10.1007/s00040-018-0616-9 (reviewed).

Umezawa, Y., Tamaki, A., Suzuki, T., Takeuchi, S., Yoshimizu, C. and Tayasu, I. 2018,03 Phytoplankton as a principal diet for callianassid shrimp larvae in coastal waters, estimated from laboratory rearing and stable isotope analysis. Marine Ecology Progress Series 592:141-158. DOI:10.3354/meps12507 (reviewed).

Tuno, N., Kohzu, A., Tayasu, I., Nakayama, T., Githeko, A. and Yan, G. 2018,01 Algal diet accelerates larval growth of Anopheles gambiae (Diptera: Culicidae) and Anopheles arabiensis (Diptera: Culicidae). Journal of Medical Entomology 55:600-608. DOI:10.1093/jme/tjx244 (reviewed).

Okano, J., Tayasu, I., Nakano, S. and Okuda, N. 2017,07 Differential responses of two ecologically similar case-bearing caddisflies species to a fish chemical cue: implication for a coexistence mechanism. Zoological Science 34:461-467. DOI:10.2108/zs160207 (reviewed).

Matsubayashi, J., Saitoh, Y., Uehara, Y., Osada, Y., Habu, J., Sasaki, T. and Tayasu, I. 2017,06 Incremental analysis of vertebral centra can reconstruct the stable isotope chronology of teleost fishes. Methods in Ecology and Evolution 8:1755-1763. DOI:10.1111/2041-210X.12834 (reviewed).

Ishikawa, N.F., Chikaraishi, Y., Ohkouchi, N., Murakami, A.R., Tayasu, I., Togashi, H., Okano, J., Sakai, Y., Iwata, T., Kondoh, M. and Okuda, N. 2017,05 Integrated trophic position decreases in more diverse communities of stream food webs. Scientific Reports 7:2130. DOI:10.1038/s41598-017-02155-8 (reviewed).

Shinozuka, K., Chiwa, M., Tayasu, I., Yoshimizu, C., Otsuki, K. and Kume, A. 2017,09 Differences in stream water nitrate concentrations between a nitrogen-saturated upland forest and a downstream mixed land use river basin. Hydrology 4:43. DOI:10.3390/hydrology4030043 (reviewed).

Matsubayashi, J., Ohta, T., Takahashi, O. and Tayasu, I. 2017,01 Reconstruction of the extinct Ezo wolf’s diet. Journal of Zoology 302:88-93. DOI:10.1111/jzo.12436 (reviewed).

Naoe, S., Tayasu, I, Masaki, T. and Koike, S. 2016,09 Negative correlation between altitudes and oxygen isotope ratios of seeds: exploring its applicability to assess vertical seed dispersal.. Ecology and Evolution(9):6817-6823. DOI:10.1002/ece3.2380 (reviewed).

Kusaka, S., Ishimaru, E., Hyodo, F., Gakuhari, T., Yoneda M., Yumoto, T. and Tayasu, I. 2016,09 Homogeneous diet of contemporary Japanese inferred from stable isotope ratios of hair. . Scientific Reports 6:33122. DOI:10.1038/srep33122 (reviewed).

Matsubayashi, J., Otsubo, K., Morimoto, J.O., Nakamura, F. and Tayasu, I. 2016,09 Feeding habits may explain the morphological uniqueness of brown bears on Etorofu Island, Southern Kuril Islands in East Asia.. Biological Journal of the Linnean Society 119:99-105. DOI:10.1111/bij.12798 (reviewed).

Matsubayashi, J., Tayasu, I., Morimoto, J.O. and Mano, T. 2016,07 Testing for a predicted decrease in body size in brown bears (Ursus arctos) based on a historical shift in diet. . Canadian Journal of Zoology 94:489-495. DOI:10.1139/cjz-2016-0046 (reviewed).

Ishikawa, N.F., Togashi, H., Kato, Y., Yoshimura, M., Kohmatsu, Y., Yoshimizu, C., Ogawa, N.O., Ohte, N., Tokuchi, N., Ohkouchi, N. and Tayasu, I. 2016,05 Terrestrial-aquatic linkage on stream food webs along a forest chronosequence: multi-isotopic evidence.. Ecology 97:1146-1158. DOI:10.1890/15-1133.1 (reviewed).

Naoe, S., Tayasu, I, Sakai, Y., Masaki, T., Kobayashi, K., Nakajima, A., Sato, Y., Kiyokawa, H. and Koike, S. 2016,04 Mountain climbing bears save cherry species from global warming by their vertical seed dispersal. . Current Biology 26:R315-R316. DOI:10.1016/j.cub.2016.03.002 (reviewed).

Haraguchi, T.F. and Tayasu, I. 2016,01 Turnover of species and guilds in shrub spider communities in a 100-year post-logging chronosequence.. Environmental Entomology 45:117-126. DOI:10.1093/ee/nvv142 (reviewed).

Akamatsu, F., Suzuki, Y., Kato, Y., Yoshimizu, C. and Tayasu, I. 2016,01 A comparison of freeze-dry and oven-dry preparation methods for bulk and compound-specific carbon stable isotope analyses: examples using the benthic macroinvertebrates Stenopsyche marmorata and Epeorus latifolium.. Rapid Communications in Mass Spectrometry 30:137-142. DOI:10.1002/rcm.7421 (reviewed).

Ishida, T., Tayasu, I. and Takenaka, C. 2015,11 Quantitative reconstruction of sulfur deposition using a mixing model based on sulfur isotope ratios in tree rings.. Journal of Environmental Quality 44:1800-1808. DOI:10.2134/jeq2014.11.0506 (reviewed).

Itoh, M., Kobayashi, Y., Chen, T-Y., Tokida, T., Fukui, M., Kojima, H., Miki, T., Tayasu, I., Shiah, F-K. and Okuda, N. 2015,07 Effect of inter-annual variation in winter vertical mixing on CH4 dynamics in a subtropical reservoir.. Journal of Geophysical Research-Biogeosciences 120:1246-1261. DOI:10.1002/2015JG002972 (reviewed).

Ishida, T., Tayasu, I. and Takenaka, C. 2015,07 Characterization of sulfur deposition over the period of industrialization in Japan using sulfur isotope ratio in Japanese cedar tree rings taken from stumps.. Environmental Monitoring and Assessment 187:459. DOI:10.1007/s10661-015-4678-0 (reviewed).

Ishikawa, N.F., Tayasu, I., Yamane, M., Yokoyama, Y., Sakai, S. and Ohkouchi, N. 2015,05 Sources of dissolved inorganic carbon in two small streams with different bedrock geology: insights from carbon isotopes.. Radiocarbon 57(3):439-448. DOI:10.2458/azu_rc.57.18348 (reviewed).

Matsubayashi, J., Morimoto, J.O., Tayasu, I., Mano, T., Nakajima, M., Takahashi, O., Kobayashi, K. and Nakamura, F. 2015,03 Major decline in marine and terrestrial animal consumption by brown bears (Ursus arctos). Scientific Reports 5:9203. DOI:10.1038/srep09203 (reviewed).

Ishikawa, N.F., Kato, Y., Togashi, H., Yoshimura, M., Yoshimizu, C., Okuda, N. and Tayasu, I. 2014,07 Stable nitrogen isotopic composition of amino acids reveals food web structure in stream ecosystems. Oecologia 175:911-922. DOI:10.1007/s00442-014-2936-4 (reviewed).

Ishikawa, N.F., Uchida, M., Shibata, Y. and Tayasu, I. 2014,05 Carbon storage reservoirs in watersheds support stream food webs via periphyton production. Ecology 95:1264-1271. DOI:10.1890/13-0976.1 (reviewed).

Umezawa, Y., Yamaguchi, A., Ishizaka, J., Hasegawa, T., Yoshimizu, C., Tayasu, I., Yoshimura, H., Morii, Y., Aoshima, T., and Yamawaki, N. 2014,02 Seasonal shifts in the contributions of the Changjiang River and the Kuroshio Current to nitrate dynamics at the continental shelf of the northern East China Sea based on a nitrate dual isotopic composition approach.. Biogeosciences 11:1297-1317. DOI:10.5194/bg-11-1297-2014 (reviewed).

【Review Articles】

Ohkouchi, N., Chikaraishi, Y, Close, H.G., Fry, B., Larsen, T., Madigan, D.J., McCarthy, M.D., McMahon, K.W., Nagata, T., Naito, Y.I., Ogawa, N.O., Popp, B.N., Steffan, S., Takano, Y., Tayasu, I., Wyatt, A.S.J., Yamaguchi, Y.T. and Yokoyama, Y. 2017,08 Advances in the application of amino acid nitrogen isotopic analysis in ecological and biogeochemical studies. Organic Geochemistry 113:150-174. DOI:10.1016/j.orggeochem.2017.07.009 (reviewed).