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  • Xing D., Choi B., Takizawa Y., Fan R., Sugaya S., Tsuchiya M., Ohkouchi N., Chikaraishi Y. (2020) Trophic hiearchy of coastal marine fish communities viewed via compound-specific isotope analysis of amino acids. Marine Ecology Progress Series 652, 137-144.
  • Takizawa Y., Takano Y., Choi B., Dharampal P.S., Steffan S.A., Ogawa N.O., Ohkouchi N., Chikaraishi Y. (2020) A new insight into isotopic fractionation associated with decarboxylation in organisms: implications for amino acid isotope approaches in biogeoscience 7, 50.
  • Choi B., Lee C., Takizawa Y., Chikaraishi Y., Oh. H.-J., Chang K.-H., Jang M.-H., Kim H.-W., Lee K.-L., Shin K.-H. (2020) Trophic response to ecological conditions of habitats: Evidence from trophic variability of freshwater fish. Ecology and Evolution 10, 7250-7260.


  • 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., Steffan S.A. (2019) Quantifying niche partitioning and multichannel feeding among tree squirrels. Food Webs 21, e00124.
  • Steffan A.S., Dharampal P.S., N. Danforth B.N., Gaines-Day H.R., Takizawa Y., Chikaraishi Y. (2019) Omnivory in bees: Elevated trophic positions among all major bee families. American Naturalist, in press


  • Choi B., Takizawa Y., Chikaraishi Y. (2018) Compression of trophic discrimination in 15N/14N within amino acids for herbivorous gastropods. Researches in Organic Geochemistry 34, 29-35.
  • Ishikawa N.F., Chikaraishi Y., Takano Y., Sasaki Y., Takizawa Y., Tsuchiya M., Tayasu I., Nagata T., 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, 607-620.


  • Takizawa Y., Chikaraishi Y. (2017) Change in the d15N value of plant amino acids on the phenology of leaf flush and senescence. Researches in Organic Geochemistry 33, 1-6.
  • Takizawa Y., Dharampal P.S., Steffan S.A., Takano Y., Naohiko N., Chikaraishi Y. (2017) Intra-trophic isotopic discrimination of 15N/14N for amino acids in autotrophs: implication for nitrogen dynamics in ecological studies. Ecology and Evolution 7, 2916-2924.
  • Blanke, C.M., Chikaraishi Y., Takizawa Y., Steffan S.A., Dharampal P.S., 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, 1291-1297.


  • Takizawa Y., Chikaraishi Y. (2014) Are baby sprouts eating the proteins in the mother sweet potato? Researches in Organic Geochemistry 30, 29-32.