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Peer-Reviewed Papers


2020201920182017201620152014201320122011201020092008200720062005200420032001

2020
  • Choi, B., Lee, C., Takizawa, Y., Chikaraishi, Y., Oh, H.-J., Chang, K.-H., Jang, M.-H., Kim, H.-W., Lee, K.-L., and Shin, K.-H. (2020) Trophic response to ecological conditions of habitats: Evidence from trophic variability of freshwater fish. Ecology and Evolution, in press. doi:10.1002/ece3.6451. [Open Access]

2019
  • Choi, B., Takizawa, Y., and Chikaraishi, Y. (2019) Compression of trophic discrimination in 15N/14N within amino acids for herbivorous gastropods. Researches in Organic Geochemistry, 34(2), 29-35. doi:10.20612/rog.34.2_29. [Open Access]
  • Furukawa, Y., Chikaraishi, Y., Ohkouchi, N., Ogawa, N.O., Glavin, D.P., Dworkin, J.P., Abe, C., and Nakamura, T. (2019) Extraterrestrial ribose and other sugars in primitive meteorites. Proceedings of the National Academy of Sciences, 116(49), 24440-24445. doi:10.1073/pnas.1907169116. [Open Access]
  • Goulden, S.K.E., Ohkouchi, N., Freeman, K.H., Chikaraishi, Y., Ogawa, N.O., Suga, H., Chadwick, O., and Houlton, B.Z. (2019) Strong correspondence between nitrogen isotope composition of foliage and chlorin across a rainfall gradient: implications for paleo-reconstruction of the nitrogen cycle. Biogeosciences, 16(19), 3869-3882. doi:10.5194/bg-16-3869-2019. [Open Access]
  • Itahashi,Y., Erdal, Y.S., Tekin,H., Omar, L., Miyake, Y., Chikaraishi, Y., Ohkouchi, N., and Yoneda, M. (2019) Amino acid 15N analysis reveals change in the importance of freshwater resources between the hunter‐gatherer and farmer in the Neolithic upper Tigris. American Journal of Physical Anthropology, 168(4), 676-686. doi:10.1002/ajpa.23783. [Abstract]
  • Morra, K.E., Chikaraishi, Y., Gandhi, H., James, H.F., Rossman, S., Wiley, A.E., Raine, A.F., Beck, J., and Ostrom, P.H. (2019) Trophic declines and decadal-scale foraging segregation in three pelagic seabirds. Oecologia, 189(2), 395-406. doi:10.1007/s00442-018-04330-8. [Open Access]
  • Pauli, j.N., Manlick, P.J., Dharampal, P.S., Takizawa, Y., Chikaraishi, Y., Niccolai, L.J., Grauer, J.A., Black, K.L., Restrepo, G.M., Perring, P.L., Wilson, E.C., Martin, M.E., Curras, M.R., Bougie, T.A., Thomson, K.L., Smith, M.M., and Steffan, S.A. (2019) Quantifying niche partitioning and multichannel feeding among tree squirrels, Food Webs, 21, e00124. doi:10.1016/j.fooweb.2019.e00124. [Abstract]
  • Steffan, A.S., Dharampal, P.S., N. Danforth, B.N., Gaines-Day, H.R., Takizawa, Y., and Chikaraishi, Y. (2019) Omnivory in bees: Elevated trophic positions among all major bee families. The American Naturalist, 194(3), 414-421. doi:10.1086/704281. [Open Access]
  • Sugahara, H., Takano, Y., Tachibana, S., Sugawara, I., Chikaraishi, Y., Ogawa, N.O., Ohkouchi, N., Kouchi, A., and Yurimoto, H. (2019) Molecular and isotopic compositions of nitrogen-containing organic molecules formed during UV-irradiation of simulated interstellar ice. Geochemical Journal, 53(1), 5-20. doi:10.2343/geochemj.2.0553. [Open Access]
  • Wyatt, A.S.J., Matsumoto, R., Chikaraishi, Y., Miyairi, Y., Yokoyama, Y., Sato, K., Ohkouchi, N., and Nagata, T. (2019) Enhancing insights into foraging specialization in the world's largest fish using a multi‐tissue, multi‐isotope approach. Ecological Monographs, 89(1), e01339. doi:10.1002/ecm.1339. [Open Access]

2018
  • Blanke, C., Chikaraishi, Y., and Vander Zanden, M.J. (2018) Historical niche partitioning and long‐term trophic shifts in Laurentian Great Lakes deepwater coregonines. Ecosphere, 9(1), e02080. doi:10.1002/ecs2.2080. [Open Access]
  • Chang, N.-N., Lin, L.-H., Tu, T.-H., Jeng, M.-S., Chikaraishi, Y., and Wang, P.-L. (2018) Trophic structure and energy flow in a shallow-water hydrothermal vent: Insights from a stable isotope approach. PLoS ONE, 13(10), e204753. doi:10.1371/journal.pone.0204753. [Open Access]
  • Goto, A.S., Miura, K., Korenaga, T., Hasegawa, T., Ohkouchi, N., and Chikaraishi, Y. (2018) Fractionation of stable nitrogen isotopes (15N/14N) during enzymatic deamination of glutamic acid: Implications for mass and energy transfers in the biosphere. Geochemical Journal, 52(3),273-280. doi:10.2343/geochemj.2.0513. [Abstract]
  • Ishikawa, N.F., Chikaraishi, Y., Takano, Y., Sasaki, Y., Takizawa, Y., Tsuchiya, M., Tayasu, I., Nagata, T., and Ohkouchi, N. (2018) 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. [Open Access]
  • Itahashi, Y., Tsuneki, A., Dougherty, S.P., Chikaraishi, Y., Ohkouchi, N., and Yoneda, M. (2018) Dining together: Reconstruction of Neolithic food consumption based on the δ15N values for individual amino acids at Tell el-Kerkh, northern Levant. Journal of Archaeological Science: Reports, 17, 775-784. doi:10.1016/j.jasrep.2017.12.042. [Open Access]
  • Nunoura, T., Chikaraishi, Y., Izaki, R., Suwa, T., Sato, T., Harada, T., Mori, K., Kato, Y., Miyazaki, M., Shimamura, S., Yanagawa, K., Shuto, A., Ohkouchi, N., Fujita, N., Takaki, Y., Atomi, H., and Takai K. (2018) A primordial and reversible TCA cycle in a facultatively chemolithoautotrophic thermophile. Science, 359(6375), 559-563. doi:10.1126/science.aao3407. [Abstract]
  • Takano, Y., Chikaraishi, Y., Imachi, H., Miyairi, Y., Ogawa, N.O., Kaneko, M., Yokoyama, Y., Krüger, M., and Ohkouchi, N. (2018) Insight into anaerobic methanotrophy from 13C/12C- amino acids and 14C/12C-ANME cells in seafloor microbial ecology. Scientific Reports, 8:14070. doi:10.1038/s41598-018-31004-5. [Open Access]
  • Tsuchiya, M., Chikaraishi, Y., Nomaki, H., Sasaki, Y., Tame, A., Uematsu, K., and Ohkouchi, N. (2018) Compound‐specific isotope analysis of benthic foraminifer amino acids suggests microhabitat variability in rocky‐shore environments. Ecology and Evolution, 8(16), 8380-8395. doi:10.1002/ece3.4358. [Open Access]
  • Urai, A., Takahashi, K., Chikaraishi, Y., and Fukushima, K. (2018) Algal-derived 24-ethylcholesta-5,22-dien-3β-ol (stigmasterol) is frequently found in high-molecular-weight dissolved organic matter (HMW-DOM) during summer in freshwater and brackish lakes. Geochemical Journal, 52(4), e15-e20. doi:10.2343/geochemj.2.0528. [Abstract]

2017
  • Blanke, C.M., Chikaraishi, Y., Takizawa, Y., Steffan, S.A., Dharampal, P.S., and Vander Zanden, M.J. (2017) Comparing compound-specific and bulk stable nitrogen isotope trophic discrimination factors across multiple freshwater fish species and diets. Canadian Journal of Fisheries and Aquatic Sciences, 74(8), 1291-1297. doi:10.1139/cjfas-2016-0420. [Abstract]
  • Campbell, C.J., Nelson, D.M., Ogawa, N.O., Chikaraishi, Y., and Ohkouchi, N. (2017) Trophic position and dietary breadth of bats revealed by nitrogen isotopic composition of amino acids. Scientific Reports, 7:15932. doi:10.1038/s41598-017-15440-3. [Abstract]
  • Choi, B., Ha, S.-Y., Lee, J.S., Chikaraishi, Y., Ohkouchi, N., and Shin, K.-H. (2017) Trophic interaction among organisms in a seagrass meadow ecosystem as revealed by bulk δ13C and amino acid δ15N analyses. Limnology and Oceanography, 62(4), 1426-1435. doi:10.1002/lno.10508. [Abstract]
  • Drucker, D.G., Naito, Y.I., Péan, S., Prat, S., Crépin, L., Chikaraishi, Y., Ohkouchi, N., Puaud, S., Lázničková-Galetová, M., Patou-Mathis, M., Yanevich, A., and Bocherens, H. (2017) Isotopic analyses suggest mammoth and plant in the diet of the oldest anatomically modern humans from far southeast Europe. Scientific Reports, 7:6833. doi:10.1038/s41598-017-07065-3. [Abstract]
  • 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) Integrated trophic position decreases in more diverse communities of stream food webs. Scientific reports, 7:2130. doi:10.1038/s41598-017-02155-8. [Abstract]
  • Ishikawa, N.F., Hayashi, F., Sasaki, Y., Chikaraishi, Y., and Ohkouchi, N. (2017) Trophic discrimination factor of nitrogen isotopes within amino acids in the dobsonfly Protohermes grandis (Megaloptera: Corydalidae) larvae in a controlled feeding experiment. Ecology and Evolution, 7(6), 1674-1679. doi:10.1002/ece3.2728. [Abstract]
  • Itahashi, Y., Miyake, Y., Maeda, O., Kondo, O., Hongo, H., Van Neer, W., Chikaraishi, Y., Ohkouchi, N., and Yoneda, M. (2017) Preference for fish in a Neolithic hunter-gatherer community of the upper Tigris, elucidated by amino acid δ15N analysis. Journal of Archaeological Science, 82, 40-49. doi:10.1016/j.jas.2017.05.001. [Abstract]
  • 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) 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. [Abstract]
    The Most Cited Organic Geochemistry Articles
  • Ostrom, P.H., Wiley, A.E., James, H.F., Rossman, S., Walker, W.A., Zipkin, E.F., and Chikaraishi, Y. (2017) Broad-scale trophic shift in the pelagic North Pacific revealed by an oceanic seabird. Proceedings of the royal society B, 284(1851). doi:10.1098/rspb.2016.2436. [Abstract]
  • Steffan, S.A., Chikaraishi, Y., Dharampal, P.S., Pauli, J.N., Guédot, C., and Ohkouchi, N. (2017) Unpacking brown food-webs: Animal trophic identity reflects rampant microbivory. Ecology and Evolution, 7(10), 3532-3541. doi:10.1002/ece3.2951. [Abstract]
  • Sugahara, H., Takano, Y., Ogawa, N.O., Chikaraishi, Y., and Ohkouchi, N. (2017) Nitrogen Isotopic Fractionation in Ammonia during Adsorption on Silicate Surfaces. ACS Earth and Space Chemistry, 1(1), 24-29. doi:10.1021/acsearthspacechem.6b00006. [Abstract]
  • Takishita, K., Chikaraishi, Y., Tanifuji, G., Ohkouchi, N., Hashimoto, T., Fujikura, K., and Roger, A.J. (2017) Microbial Eukaryotes that Lack Sterols. Journal of Eukaryotic Microbiology. doi:10.1111/jeu.12426. [Abstract]
  • Takishita, K., Takaki, Y., Chikaraishi, Y., Ikuta, T., Ozawa, G., Yoshida, T, Ohkouchi, N., and Fujikura, K. (2017) Genomic Evidence that Methanotrophic Endosymbionts Likely Provide Deep-Sea Bathymodiolus Mussels with a Sterol Intermediate in Cholesterol Biosynthesis. Genome Biology and Evolution, 9(5), 1148-1160. doi:10.1093/gbe/evx082. [Abstract]
  • Takizawa, Y., and Chikaraishi, Y. (2017) Change in the δ15N value of plant amino acids on the phenology of leaf flush and senescence. Researches in Organic Geochemistry, 33(1), 1-6. doi:10.20612/rog.33.1_1. [Open Access]
  • Takizawa, Y., Dharampal, P.S., Steffan, S.A., Takano, Y., Ohkouchi, N., and Chikaraishi, Y. (2017) Intra-trophic isotopic discrimination of 15N/14N for amino acids in autotrophs: Implications for nitrogen dynamics in ecological studies. Ecology and Evolution, 7(9), 2916-2924. doi:10.1002/ece3.2866. [Abstract]
  • Williams, B., Thibodeau, B., Chikaraishi, Y., Ohkouchi, N., Walnum, A., Grottoli, A.G., and Colin, P.L. (2017) Consistency in coral skeletal amino acid composition offshore of Palau in the western Pacific warm pool indicates no impact of decadal variability in nitricline depth on primary productivity. Limnology and Oceanography, 62(2), 399-407. doi:10.1002/lno.10364. [Abstract]
  • Yamaguchi, Y.T., Chikaraishi, Y., Takano, Y., Ogawa, N.O., Imachi, H., Yokoyama, Y., and Ohkouchi, N. (2017) Fractionation of nitrogen isotopes during amino acid metabolism in heterotrophic and chemolithoautotrophic microbes across Eukarya, Bacteria, and Archaea: Effects of nitrogen sources and metabolic pathways. Organic Geochemistry, 111, 101-112. doi:10.1016/j.orggeochem.2017.04.004. [Abstract]

2016
  • Chan, Q.H.S., Chikaraishi, Y., Takano, Y., Ogawa, N.O., and Ohkouchi, N. (2016) Amino acid compositions in heated carbonaceous chondrites and their compound-specific nitrogen isotopic ratios. Earth, Planets and Space, 68(7). doi:10.1186/s40623-016-0382-8. [Abstract]
  • Kruger, B.R., Werne, J.P., Branstrator, D.K., Hrabik, T.R., Chikaraishi, Y., Ohkouchi, N., and Minor, E.C. (2016) Organic matter transfer in Lake Superior's food web: Insights from bulk and molecular stable isotope and radiocarbon analyses. Limnology and Oceanography, 61(1), 149-164. doi:10.1002/lno.10205. [Abstract]
  • Naito, Y.I., Bocherens, H., Chikaraishi, Y., Drucker, D.G., Wißing, C., Yoneda, M., and Ohkouchi, N. (2016) An overview of methods used for the detection of aquatic resource consumption by humans: Compound-specific delta N-15 analysis of amino acids in archaeological materials. Journal of Archaeological Science: Reports, 6, 720-732, doi:10.1016/j.jasrep.2015.11.025. [Abstract]
  • Naito, Y.I., Chikaraishi, Y., Drucker, D.G., Ohkouchi, N., Semal, P., Wißing, C., and Bocherens, H. (2016) Ecological niche of Neanderthals from Spy Cave revealed by nitrogen isotopes of individual amino acids in collagen. Journal of Human Evolution, 93, 82-90. doi:10.1016/j.jhevol.2016.01.009. [Abstract]
  • Naito, Y.I., Germonpré, M., Chikaraishi, Y., Ohkouchi, N., Drucker, D.G., Hobson, K.A., Edwards, M.A., Wißing, C., and Bocherens, H. (2016) Evidence for herbivorous cave bears (Ursus spelaeus) in Goyet Cave, Belgium: Implications for paleodietary reconstruction of fossil bears using amino acid δ15N approaches. Journal of Quaternary Science, 31(6), 598-606. doi:10.1002/jqs.2883. [Abstract]
  • Ohkouchi, N., Shibata, H., Chikaraishi, Y., Nomaki, H., Ogawa, N.O., Nagata, T., Goto, T., Fujikura, K., and Kitazato, H. (2016) A monitoring result of polychlorinated biphenyls (PCBs) in deep-sea organisms and sediments off Tohoku during 2012-2014: temporal variation and the relationship with the trophic position. Journal of Oceanography, 72(4), 629-639. doi:10.1007/s10872-016-0359-z. [Abstract]
  • Schimmelmann, A., Qi, H., Coplen, T.B., Brand, W.A., Fong, J., Meier-Augenstein, W., Kemp, H.F., Toman, B., Ackermann, A., Assonov, S., Aerts-Bijma, A.T., Brejcha, R., Chikaraishi, Y., Darwish, T., Elsner, M., Gehre, M., Geilmann, H., Gröning, M., Hélie, J.-F., Herrero-Martín, S., Meijer, H.A., Sauer, P.E., Sessions, A.L., and Werner, R.A. (2016) Organic Reference Materials for Hydrogen, Carbon, and Nitrogen Stable Isotope-Ratio Measurements: Caffeines, n-Alkanes, Fatty Acid Methyl Esters, Glycines, L-Valines, Polyethylenes, and Oils. Analytical Chemistry, 88(8), 4294-4302. doi:10.1021/acs.analchem.5b04392. [Abstract]

2015
  • Chikaraishi, Y., Steffan, S.A., Takano, Y., and Ohkouchi, N. (2015) Diet quality influences isotopic discrimination among amino acids in an aquatic vertebrate. Ecology and Evolution, 5(10), 2048-2059. doi:10.1002/ece3.1491. [Abstract]
  • Hirahara, M., Chikaraishi, Y., and Toda, T. (2015) Isotopic discrimination of 15N / 14N of amino acids among the calanoid copepod Acartia steueri and its food items, eggs, and fecal pellets. Researches in Organic Geochemistry, 31(1), 29-32. doi:10.20612/rog.31.1_29. [Abstract]
  • Kruse, S., Pakhomov, E.A., Hunt, B.P.V., Chikaraishi, Y., Ogawa, N.O., and Bathmann, U. (2015) Uncovering the trophic relationship between Themisto gaudichaudii and Salpa thompsoni in the Antarctic Polar Frontal Zone. Marine Ecology Progress Series, 529, 63-74. doi:10.3354/meps11288 . [Abstract]
  • Miyachi, S., Mayahara, T., Tsushima, K., Sasada, K., Kohno, E., Ogawa, N.O., Chikaraishi, Y., and Ohkouchi, N. (2015) Approach to determine individual trophic level and the difference in food sources of Japanese anchovy Engraulis japonicus in Sagami Bay, based on compound-specific nitrogen stable isotope analysis of amino acids. Fisheries Science, 81(6), 1053-1062. doi:10.1007/s12562-015-0923-2. [Abstract]
  • Nomaki, H., Chikaraishi, Y., Tsuchiya, M., Toyofuku, T., Suga, H., Sasaki, Y., Uematsu, K., Tame, A., and Ohkouchi, N. (2015) Variation in the nitrogen isotopic composition of amino acids in benthic foraminifera: Implications for their adaptation to oxygen-depleted environments. Limnology and Oceanography, 60(6), 1906-1916. doi:10.1002/lno.10140. [Abstract]
  • Ohkouchi, N., Ogawa, N.O., Chikaraishi, Y., Tanaka, H., and Wada, E. (2015) Biochemical and physiological bases for the use of carbon and nitrogen isotopes in environmental and ecological studies. Progress in Earth and Planetary Science, 2(1), doi:10.1186/s40645-015-0032-y. [Abstract]
    PEPS The Most Accessed Paper Award 2017
    PEPS The Most Cited Paper Award 2018
  • Steffan, S.A., Chikaraishi, Y., Currie, C.R., Horn, H., Gaines-Day, H.R., Pauli, J.N., Zalapa, J.E., and Ohkouchi, N. (2015) Microbes are trophic analogs of animals. Proceedings of the National Academy of Sciences of the United States of America, 112(49), 15119-15124. doi:10.1073/pnas.1508782112. [Abstract]
  • Steffan, S.A., Chikaraishi, Y., Horton, D.R., Miliczky, E., Zalapa, J.E., Jones, V.P., and Ohkouchi, N. (2015) Beneficial or not? Decoding carnivore roles in plant protection. Biological Control, 91, 34-41. doi:10.1016/j.biocontrol.2015.07.002. [Abstract]
  • Takano, Y., Chikaraishi, Y., and Ohkouchi, N. (2015) Isolation of underivatized amino acids by ion-pair high performance liquid chromatography for precise measurement of nitrogen isotopic composition of amino acids: Development of comprehensive LC x GC/C/IRMS method. International Journal of Mass Spectrometry, 379, 16-25. doi:10.1016/j.ijms.2014.11.012. [Abstract]
  • Yamanaka, T., Shimamura, S., Chikaraishi, Y., Haga, T., and Fujiwara, Y. (2015) Re-evaluation of nutrient sources for deep-sea wood-boring bivalves using the isotopic composition of bulk C, N, S, and amino acid nitrogen. Marine ecology progress series, 540, 157-165. doi:10.3354/meps11510. [Abstract]

2014
  • Aoyagi K., Goto A.S., Fujino T., Korenaga T., and Chikaraishi Y. (2014) Deuterium depletion in the fatty acids from beef. Researches in Organic Geochemistry, 29, 65-69. [Abstract]
  • Chikaraishi, Y., Steffan, S.A., Ogawa, N.O., Ishikawa, N.F., Sasaki, Y., Tsuchiya, M., and Ohkouchi, N. (2014) High-resolution food webs based on nitrogen isotopic composition of amino acids. Ecology and Evolution, 4(12), 2423-2449. doi:10.1002/ece3.1103. [Abstract]
  • Itahashi, Y., Chikaraishi, Y., Ohkouchi, N., and Yoneda, M. (2014) Refinement of reconstructed ancient food webs based on the nitrogen isotopic compositions of amino acids from bone collagen: A case study of archaeological herbivores from Tell Ain el-Kerkh, Syria. Geochemical Journal, 48(4), e15-e19. doi:10.2343/geochemj.2.0318. [Abstract]
  • Kaneko, M., Takano, Y., Chikaraishi, Y., Ogawa, N.O., Asakawa, S., Watanabe, T., Shima, S., Krüger, M., Matsushita, M., Kimura, H., and Ohkouchi, N. (2014) Quantitative analysis of coenzyme F430 in environmental samples: a new diagnostic tool for methanogenesis and anaerobic methane oxidation. Analytical Chemistry, 86(7), 3633-3638. doi:10.1021/ac500305j. [Abstract]
  • Maki, K., Ohkouchi, N., Chikaraishi, Y., Fukuda, H., Miyajima, T., and Nagata, T. (2014) Influences of nitrogen substrates and substrate C:N ratios on the nitrogen isotopic composition of amino acids from the marine bacterium Vibrio harveyi. Geochimica et Cosmochimica Acta, 140, 521-530. doi:10.1016/j.gca.2014.05.052. [Abstract]
  • Nomaki, H., Chikaraishi, Y., Tsuchiya, M., Toyofuku, T., Ohkouchi, N., Uematsu, K., Tame, A., and Kitazato, H. (2014) Nitrate uptake by foraminifera and use in conjunction with endobionts under anoxic conditions. Limnology and Oceanography, 59(6), 1879-1888. doi:10.4319/lo.2014.59.6.1879. [Abstract]
  • Takizawa, Y., and Chikaraishi, Y. (2014) Are baby sprouts eating the proteins in the mother sweet potato? Researches in Organic Geochemistry, 30(1), 29-32. doi:10.20612/rog.30.1_29. [Abstract]

2013
  • Naito, Y.I., Chikaraishi, Y., Ohkouchi, N., Drucker, D.G., and Bocherens, H. (2013) Nitrogen isotopic composition of collagen amino acids as an indicator of aquatic resource consumption: insights from Mesolithic and Epipalaeolithic archaeological sites in France. World Archaeology, 45(3), 338-359. doi:10.1080/00438243.2013.820650. [Abstract]
  • Naito, Y.I., Chikaraishi, Y., Ohkouchi, N., and Yoneda, M. (2013) Evaluation of carnivory in inland Jomon hunter-gatherers based on nitrogen isotopic compositions of individual amino acids in bone collagen. Journal of Archaeological Science, 40(7), 2913-2923. doi:10.1016/j.jas.2013.03.012. [Abstract]
  • Ogawa, N.O., Chikaraishi, Y., and Ohkouchi, N. (2013) Trophic position estimates of formalin-fixed samples with nitrogen isotopic compositions of amino acids: an application to gobiid fish (Isaza) in Lake Biwa, Japan. Ecological Research, 28(5), 697-702. doi:10.1007/s11284-012-0967-z. [Abstract]
  • Ohkouchi, N., Tsuda, R., Chikaraishi, Y., and Tanabe, K. (2013) A preliminary estimate of the trophic position of the deep-water ram’s horn squid Spirula spirula based on the nitrogen isotopic composition of amino acids. Marine Biology, 160(4), 773-779. doi:10.1007/s00227-012-2132-1. [Abstract]
  • Steffan, S.A., Chikaraishi, Y., Horton, D.R., Ohkouchi, N., Singleton, M.E., Miliczky, E., Hogg, D.B., and Jones, V.P. (2013) Trophic Hierarchies Illuminated via Amino Acid Isotopic Analysis. PLoS ONE, 8(9): e76152. doi:10.1371/journal.pone.0076152. [Abstract]

2012
  • Aoyagi, K., Yamanaka, A., Goto, A.S., Fujino, T., Korenaga, T., and Chikaraishi, Y. (2012) Methyl and ethyl chloroformate derivatizations for compound-specific stable isotope analysis of fatty acids-II. Researches in Organic Geochemistry, 28, 27-30. [PDF]
  • Chikaraishi, Y., Kaneko, M., and Ohkouchi, N. (2012) Stable hydrogen and carbon isotopic compositions of long-chain (C21-C33) n-alkanes and n-alkenes in insects. Geochimica et Cosmochimica Acta, 95(15), 53-62. doi:10.1016/j.gca.2012.07.036. [Abstract]
  • Maeda, T., Hirose, E., Chikaraishi, Y., Kawato, M., Takishita, K., Yoshida, T., Verbruggen, H., Tanaka, J., Shimamura, S., Takai, Y., Tsuchiya, M., Iwai, K., and Maruyama, T. (2012) Algivore or phototroph? Plakobranchus ocellatus (Gastropoda) continuously acquires kleptoplasts and nutrition from multiple algal species in nature. PLoS ONE, 7(7): e42024. doi:10.1371/journal.pone.0042024. [Abstract]
  • Miller, M.J., Chikaraishi, Y., Ogawa, N.O., Yamada, Y., Tsukamoto, K., and Ohkouchi, N. (2012) A low trophic position of Japanese eel larvae indicates feeding on marine snow. Biology Letters, 9(1). doi:10.1098/rsbl.2012.0826. [Abstract]
  • Sachse, D., Billault, I., Browen, G.J., Chikaraishi, Y., Dawson, T.E., Feakins, S.J., Freeman, K.H., Magill, C.R., McInerney, F.A., van der Meer, M.T.J., Polissar, P., Robins, R.J., Sachs, J.P., Schmidt, H.-L., Sessions, A.L., White, J.W.C., West, J.B., and Kahmen, A. (2012) Molecular palephydrology: Interpreting the hydrogen-isotopic composition of lipid biomarkers from photosynthesizing organisms. Annual Review of Earth and Planetary Sciences, 40, 221-249. doi:10.1146/annurev-earth-042711-105535. [Abstract]
  • Takahashi, Y., Sasaki, Y., Chikaraishi, Y., Tsuchiya, M., Watanabe, H., Asahida, T., Maruyama, T., and Fujikura, K. (2012) Does the symbiotic scale-worm feed on the host mussel in deep-sea vent fields? Researches in Organic Geochemistry, 28, 23-26. [PDF]
  • Takishita, K., Chikaraishi, Y., Leger, M.M, Kim, E., Yabuki, A., Ohkouchi, N., and Roger, A.J. (2012) Lateral transfer of tetrahymanol-synthesizing genes has allowed multiple diverse eukaryote lineages to independently adapt to environments without oxygen. Biology Direct, 7(5). doi:10.1186/1745-6150-7-5. [Abstract]

2011
  • Chikaraishi, Y., Ogawa, N.O., Doi, H., and Ohkouchi, N. (2011) 15N/14N ratios of amino acids as a tool for studying terrestrial food webs: a case study of terrestrial insects (bees, wasps, and hornets). Ecological Research, 26(4), 835-844. doi:10.1007/s11284-011-0844-1. [Abstract]
    Ecological Research Award, 2011
  • Goto, A.S., Korenaga, T., and Chikaraishi, Y. (2011) Methyl and ethyl chloroformate derivatizations for compound-specific stable isotope analysis (CSIA) of fatty acids. Researches in Organic Geochemistry, 27, 91-95. [PDF]
  • Strable, M.S., Tschanz, C.L., Varamini, B., Chikaraishi Y., Ohkouchi, N., and Brenna, J.T. (2011) Mammalian DNA δ15N exhibits 40‰ intramolecular variation and is unresponsive to dietary protein level. Rapid communications in Mass Spectrometry, 25(23), 3555-3563. doi:10.1002/rcm.5263. [Abstract]
  • Zhou, Y., Grice, K., Chikaraishi, Y., Stuart-Williams, H. Farquhar G.D., and Ohkouchi, N. (2011) Temperature effect on leaf water deuterium enrichment and isotopic fractionation during leaf lipid biosynthesis: Results from controlled growth of C3 and C4 land plants. Phytochemistry, 72(2-3), 207-213. doi:10.1016/j.phytochem.2010.10.022. [Abstract]

2010
  • Akamatsu, F., Yamamoto, M., Chikaraishi, Y., and Toda, H. (2010) Evaluation of algal contribution to aquatic insects based on 13C/12C and C/N ratios. Researches in Organic Geochemistry, 26, 107-114. [PDF]
  • Chikaraishi, Y., Ogawa, N.O., and Ohkouchi, N. (2010) Further evaluation of the trophic level estimation based on nitrogen isotopic composition of amino acids. In: Earth, Life, and Isotopes (Eds. Ohkouchi N, Tayasu I, Koba K), Kyoto University Press, pp.37-51.
  • Chikaraishi, Y., and Ohkouchi, N. (2010) An improved method for precise determination of carbon isotopic composition of amino acids. In: Earth, Life, and Isotopes (Eds. Ohkouchi N, Tayasu I, Koba K), Kyoto University Press, pp.355-366.
  • Chikaraishi, Y., Takano, Y., Ogawa, N.O., and Ohkouchi, N. (2010) Instrumental optimization of compound-specific nitrogen isotope analysis of amino acids by gas chromatography/combustion/isotope ratio mass spectrometry. In: Earth, Life, and Isotopes (Eds. Ohkouchi N, Tayasu I, Koba K), Kyoto University Press, pp.367-386.
  • Kashiyama, Y., Ogawa, N.O., Chikaraishi, Y., Kashiyama, N., Sakai, S., Tanabe, K., and Ohkouchi, N. (2010) Reconstructing the life history of modern and fossil nautiloids based on the nitrogen isotopic composition of shell organic matter and amino acids. Cephalopods - Present and Past, Tokai University Press, Tokyo, pp.67-75. [PDF]
  • Naito, Y.I., Chikaraishi, Y., Ohkouchi, N., Mukai, H., Shibata, Y., Honch, N.V., Dodo, Y., Ishida, H., Amano, T., Ono, H., and Yoneda, M. (2010) Dietary reconstruction of the Okhotsk Culture of Hokkaido, Japan, based on nitrogen isotopic composition of amino acids: implication for correction of 14C marine reservoir effects on human bones. Radiocarbon, 52(2), 671-681. [Abstract]
  • Naito, Y.I., Honch, N.V., Chikaraishi, Y., Ohkouchi, N., and Yoneda, M. (2010) Quantitative evaluation of marine protein contribution in ancient diets based on nitrogen isotope ratios of individual amino acids in bone collagen: An investigation at the Kitakogane Jomon site. American Journal of Physical Anthropology, 143(1), 31-40. doi:10.1002/ajpa.21287. [Abstract]
  • Ohkouchi, N., Chikaraishi, Y., Kashiyama, Y., and Ogawa, N.O. (2010) Isotopomers of chlorophyll nuclei: Theories and an application. In: Earth, Life, and Isotopes (Eds. Ohkouchi N, Tayasu I, Koba K), Kyoto University Press, pp.271-290.
  • Sonoda, K., Takahashi, M., Chikaraishi, Y., and Yamamoto, S. (2010) Compound-specific stable carbon isotope analysis of lignin phenols by gas chromatography/combustion/isotope ratio mass spectrometry (GC/C/IRMS). Researches in Organic Geochemistry, 26, 115-122. [PDF]
  • Takano, Y., Chikaraishi, Y., Ogawa, N.O., Nomaki, H., Morono, Y., Inagaki, F., Kitazato, H., Hinrichs, K.-U., and Ohkouchi, N. (2010) Sedimentary membrane lipids recycled by deep-sea benthic archaea. Nature Geosciences, 3, 858-861. doi:10.1038/ngeo983. [Abstract]
  • Takano, Y., Chikaraishi, Y., and Ohkouchi, N. (2010) Enantiomer-specific isotope analysis of D- and L-alanine: Nitrogen isotopic hetero- and homogeneity in microbial and chemical processes. In: Earth, Life, and Isotopes (Eds. Ohkouchi N, Tayasu I, Koba K), Kyoto University Press, pp.387-402.
  • Takano, Y., Kashiyama, Y., Ogawa, N.O., Chikaraishi, Y., and Ohkouchi, N. (2010) Isolation and desalting with cation-exchange chromatography for compound-specific nitrogen isotope analysis of amino acids: application to biogeochemical samples. Rapid Communications in Mass Spectrometry, 24(16), 2317-2323. [Abstract]
  • Tyler, J., Kashiyama, Y., Ohkouchi, N., Ogawa, N.O , Yokoyama, Y., Chikaraishi, Y., Staff, R.A., Ikehara, M., Bronk Ramsey, C., Bryant, C., Brock, F., Gotanda, K., Haraguchi, T., Yonenobu, H., and Nakagawa, T. (2010) Tracking aquatic change using chlorin-specific carbon and nitrogen isotopes: The last glacial-interglacial transition at Lake Suigetsu, Japan. Geochemistry, Geophysics, Geosystems, 11(9), Q09010. doi:10.1029/2010GC003186. [Abstract]

2009
  • Chikaraishi, Y., Ogawa, N.O., Kashiyama, Y., Takano, Y., Suga, H., Tomitani, A., Miyashita, H., Kitazato, H., and Ohkouchi, N. (2009) Determination of aquatic food-web structure based on compound-specific nitrogen isotopic composition of amino acids. Limnology and Oceanography: Methods., 7(11), 740-750. doi:10.4319/lom.2009.7.740. [Abstract]
  • Chikaraishi, Y., Tanaka, R., Tanaka, A., and Ohkouchi, N. (2009) Fractionation of hydrogen isotopes during phytol biosynthesis. Organic Geochemistry, 40(5), 569-573. doi:10.1016/j.orggeochem.2009.02.007. [Abstract]
  • Nomaki, H., Ohkouchi, N., Heinz, P., Suga, H., Chikaraishi, Y., Ogawa, N.O., Matsumoto, K., and Kitazato, H. (2009) Degradation of algal lipids by deep-sea benthic foraminifera: An in situ tracer experiment. Deep Sea Research Part I: Oceanographic Research Papers, 56(9), 1488-1503. doi:10.1016/j.dsr.2009.04.013.[Abstract]
  • Takano, Y., Chikaraishi, Y., Ogawa, N.O., Kitazato, H., and Ohkouchi, N. (2009) Compound-specific nitrogen isotope analysis of D-alanine, L-alanine, and valine: Application of diastereomer separation to δ15N and microbial peptidoglycan studies. Analytical Chemistry, 81(1), 394-399. doi:10.1021/ac802077v. [Abstract]

2008
  • Chikaraishi, Y., Kashiyama, Y., Ogawa, N.O., Kitazato, H., Satoh, M., Nomoto, S., and Ohkouchi, N. (2008) A compound-specific isotope method for measuring the stable nitrogen isotopic composition of tetrapyrroles. Organic Geochemistry, 39(5), 510-520. doi:10.1016/j.orggeochem.2007.08.010. [Abstract]
  • Jenkins, R.G., Hikida, Y., Chikaraishi, Y., Ohkouchi, N., and Tanabe, K. (2008) Microbially induced formation of ooid-like coated grains in the Late Cretaceous methane-seep deposits of the Nakagawa area, Hokkaido, northern Japan. Island Arc, 17(2), 261-269. doi:10.1111/j.1440-1738.2008.00616.x. [Abstract]
  • Kashiyama, Y., Miyashita, H., Ohkubo, S., Ogawa, N.O., Chikaraishi, Y., Takano, Y., Suga, H., Toyofuku, T., Nomaki, H., Kitazato, H., Nagata, T., and Ohkouchi, N. (2008) Evidence of global chlorophyll d. Science, 321(5889), pp.658. doi:10.1126/science.1158761. [Abstract]
  • Nakashita, R., Suzuki, Y., Akamatsu, F., Iizumi, Y., Korenaga, T., and Chikaraishi, Y. (2008) Stable carbon, nitrogen, and oxygen isotope analysis as a potential tool for verifying geographical origin of beef. Analytica Chimica Acta, 617, 148-152. doi:10.1016/j.aca.2008.03.048. [Abstract]
  • Ohkouchi, N., Nakajima, Y., Ogawa, N.O., Chikaraishi, Y., Suga, H., Sakai, S., and Kitazato, H. (2008) Carbon isotopic composition of the tetrapyrrole nucleus in chloropigments from a saline meromictic lake: A mechanistic view for interpreting the isotopic signature of alkyl porphyrins in geological samples. Organic Geochemistry, 39(5), 521-531. [Abstract]
  • Suzuki, Y., Chikaraishi, Y., Ogawa, N.O., Ohkouchi, N., and Korenaga, T. (2008) Geographical origin of polished rice based on multiple element and stable isotope analyses. Food Chemistry, 109(2), 470-475. doi:10.1016/j.foodchem.2007.12.063. [Abstract]

2007
  • Chikaraishi, Y., Kashiyama, Y., Ogawa, N.O., Kitazato, H., and Ohkouchi, N. (2007) Metabolic control of nitrogen isotopic composition of amino acids in macroalgae and gastropods: implications for aquatic food web studies. Marine Ecology Progress Series, 342, 85-90. doi:10.3354/meps342085. [Abstract]
  • Chikaraishi, Y., Matsumoto, K., Kitazato, H., and Ohkouchi, N. (2007) Sources and transformation processes of pheopigments: Stable carbon and hydrogen isotopic evidence from Lake Haruna, Japan. Organic Geochemistry, 38(6), 985-1001. doi:10.1016/j.orggeochem.2007.01.005. [Abstract]
  • Chikaraishi, Y., and Naraoka, H. (2007) δ13C and δD relationships among three n-alkyl compound classes (n-alkanoic acid, n-alkane and n-alkanol) of terrestrial higher plants. Organic Geochemistry, 38(2), 198-215. doi:10.1016/j.orggeochem.2006.10.003. [Abstract]

2006
  • Chikaraishi, Y. (2006) Carbon and hydrogen isotopic composition of sterols in natural marine brown and red macroalgae and associated shellfish. Organic Geochemistry, 37(4), 428-436. doi:10.1016/j.orggeochem.2005.12.006. [Abstract]
  • Chikaraishi, Y., and Naraoka, H. (2006) Carbon and hydrogen isotope variation of plant biomarkers in a plant-soil system. Chemical Geology, 231(3), 190-202. doi:10.1016/j.chemgeo.2006.01.026. [Abstract]
  • Rommerskirchen, F., Plader, A., Eglinton, G., Chikaraishi, Y., and Rulkötter, J. (2006) Chemotaxonomic significance of distribution and stable carbon isotopic composition of ling-chain alkanes and alkan-1-ols in C4 grass waxes. Organic Geochemistry, 37(10), 1303-1332. doi:10.1016/j.orggeochem.2005.12.013. [Abstract]
  • Suzuki, Y., Ishioka, S., Korenaga, T., and Chikaraishi, Y. (2006) Novel method to identify illegal diesel fuel, I: use of adamantane or [1, 2-D2] n-tetradecane as chemical marker. Environmental Science, 13(4), 207-212. [PDF]
  • Suzuki, Y., Korenaga, T., and Chikaraishi, Y. (2006) A novel method to identify illegal diesel fuel, II: the use of [1-D] n-alkane with stable hydrogen isotope analysis. Chemistry Letters, 35(5), 532-533. [Abstract]

2005
  • Chikaraishi, Y., Matsumoto, K., Ogawa, N.O., Suga, H., Kitazato, H., and Ohkouchi, N. (2005) Hydrogen, carbon and nitrogen isotopic fractionations during chlorophyll biosynthesis in C3 higher plants. Phytochemistry, 66(8), 911-920. doi:10.1016/j.phytochem.2005.03.004. [Abstract]
  • Chikaraishi, Y., and Naraoka, H. (2005) δ13C and δD identification of sources of lipid biomarkers in sediments of Lake Haruna (Japan). Geochimica et Cosmochimica Acta, 69(13), 3285-3297. doi:10.1016/j.gca.2005.02.023. [Abstract]
  • Chikaraishi, Y., Yamada, Y., and Naraoka, H. (2005) Carbon and hydrogen isotope compositions of sterols from riverine and marine sediments. Limnology and Oceanography, 50(6), 1763-1770. doi:10.4319/lo.2005.50.6.1763. [Abstract]

2004
  • Chikaraishi, Y., Naraoka, H., and Poulson, S.R. (2004) Carbon and hydrogen isotopic fractionation during lipid biosynthesis in a higher plant (Cryptomeria japonica). Phytochemistry, 65(3), 323-330. doi:10.1016/j.phytochem.2003.12.003. [Abstract]
  • Chikaraishi, Y., Naraoka, H., and Poulson, S.R. (2004) Hydrogen and carbon isotopic fractionations of lipid biosynthesis among terrestrial (C3, C4 and CAM) and aquatic plants. Phytochemistry, 65(10), 1369-1381. doi:10.1016/j.phytochem.2004.03.036. [Abstract]
  • Chikaraishi, Y., Suzuki, Y., and Naraoka, H. (2004) Hydrogen isotopic fractionations during desaturation and elongation associated with polyunsaturated fatty acid biosynthesis in marine macroalgae. Phytochemistry, 65(15), 2293-2300. doi:10.1016/j.phytochem.2004.06.030. [Abstract]

2003
  • Chikaraishi, Y., and Naraoka, H. (2003) Compound-specific δD-δ13C analyses of n-alkanes extracted from terrestrial and aquatic plants. Phytochemistry, 63(3), 361-371. doi:10.1016/S0031-9422(02)00749-5. [Abstract]

2001
  • Chikaraishi, Y., and Naraoka, H. (2001) Organic hydrogen-carbon isotope signatures of terrestrial higher plants during biosynthesis for distinctive photosynthetic pathways. Geochemical Journal, 35(6), 451-458. [Abstract]


Books and Reviews

  • Chikaraishi, Y. (2014) 13C/12C Signatures in Plants and Algae. Treatise on Geochemistry : Organic Geochemistry (Edited by Birrer, B., Falkowski, P., Freeman, K.), Elsevier, Vol.12(5), pp.95-123. [Abstract]
  • Ohkouchi, N., Nakajima, Y., Ogawa, N.O., Suga, H., Kashiyama, Y., Matsumoto, K., Chikaraishi, Y., Oguri, K., and Kitazato, H. (2006) Stable carbon and nitrogen isotopic compositions of photosynthetic pigments as tracers for elemental cycle in the modern- and paleo-environments. Frontier Research on Earth Evolution, Vol.2. [PDF]

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