研究者基本情報

• 理学士, 漢陽大学校 科学技術学部 海洋環境科学科, 2016年02月
• 理学博士, 漢陽大学校 海洋融合科学, 2022年08月

• https://researchmap.jp/htchoi

• https://orcid.org/0000-0001-5647-5046
• https://jglobal.jst.go.jp/detail?JGLOBAL_ID=202501005874336879

• 91018895

• https://orcid.org/0000-0001-5647-5046

• 202501005874336879

• Zooplankton ecology
• Trophic ecology
• Marine biogeochemistry
• Stable isotope

• 環境・農学, 環境動態解析, 海洋生態学
• 環境・農学, 環境動態解析, 安定同位体
• 環境・農学, 環境動態解析, 海洋生物地球化学

• 修士課程, 環境科学院
• 博士課程, 環境科学院

研究活動情報

• Size-related and habitat-dependent trophic dynamics of Manila clam, Ruditapes philippinarum, via bulk and amino acid isotopic signatures
  Minhwa Gu; Hee Young Yun; Hyuntae Choi; Jun-Ho Koo; Kyung-Hoon Shin
  Estuarine, Coastal and Shelf Science, 2026年03月
  研究論文（学術雑誌）
• Fatty acids as the main energy source in polyps of the jellyfish (Cnidaria: Aurelia aurita) for survival strategy under overpopulation: insights from compound-specific isotope analysis
  Nayeon Park; Hyuntae Choi; Yuko Takizawa; Yoshito Chikaraishi
  Progress in Earth and Planetary Science, 12, 1, Springer Science and Business Media LLC, 2025年10月16日
  英語, 研究論文（学術雑誌）, Abstract
  
  Jellyfish exhibit an extraordinary survival strategy in high-density populations that exceed the carrying capacity of ecosystems. It is particularly questionable how jellyfish can thrive in habitats where the concentration of toxic nitrogenous waste (i.e., NH₃) in the ambient water could be extremely high caused by high-density populations. However, physiological mechanisms of the survival strategy in jellyfish remain poorly understood, especially at the polyp stage, even though this stage is a key role in jellyfish population dynamics. In the present study, we investigated the trophic isotopic discrimination of amino acids and fatty acids in polyps of the jellyfish Aurelia aurita in controlled feeding experiments, to understand the metabolic flux of these organic substrates in the jellyfish physiology under high-density populations. Contrary to the general trophic isotopic discrimination observed in non-gelatinous organisms, the discrimination in the A. aurita polyps is close to zero for most amino acids (except for glycine and leucine), indicating a little activity of both biosynthesis and degradation of the amino acids. In contrast, the discrimination in the A. aurita polyps is considerably large for fatty acids (ranging from 18.4‰ (for C_18:0) to 50.5‰ (for C_18:2, n-6), indicating a large activity of degradation of fats (and its components, fatty acids). Based on these results, we conclude that A. aurita polyps prioritize the use of fatty acids compared to that of amino acids to produce life energy, for minimizing the production of nitrogenous waste derived from the amino acid degradation (about 0.0 mg/L for NH₃) and maintaining the quality of ambient water, and therefore for allowing them to survive in high-density populations. Moreover, these findings suggest the presence of metabolic plasticity among marine organisms. This plasticity may reflect flexible survival strategies supported by different metabolic pathways. Therefore, integrating the trophic isotopic discrimination of both amino acids and fatty acids can be useful for understanding these physiological mechanisms, as well as for accurately illustrating energy transfer along food chains in ecosystems.
  
  Graphical Abstract
• Fractionation of nitrogen isotopes in the enzymatic deamination of alanine: an insight into the quantitative evaluation of anaerobic metabolism in ecosystems
  Yuko Takizawa; Hyuntae Choi; Mio Shibuya; Nayeon Park; Prarthana S. Dharampal; Shawn A. Steffan; Yoshito Chikaraishi
  Progress in Earth and Planetary Science, 12, 1, Springer Science and Business Media LLC, 2025年09月30日
  英語, 研究論文（学術雑誌）, Abstract
  
  Nitrogen isotope ratios of amino acids have been employed as a tool for illustrating the resource utilization of organisms and the trophic transfer between organisms in food webs. This tool is proposed based on the empirical observation that a universal trophic enrichment in ¹⁵N is found in glutamic acid from diet to consumer species. Since glutamic acid is deaminated and incorporated into the tricarboxylic acid cycle (aerobic metabolism), the isotope ratios of glutamic acid have been used for evaluating life energy production through aerobic metabolism. However, little is known about the change in the isotope ratio associated with ‘anaerobic’ metabolism such as fermentation in organisms. Therefore, we determined the isotopic fractionation factor (α) for the deamination of alanine, a representative amino acid related to anaerobic metabolism, and conducted laboratory-cultured experiments to see the change in the nitrogen isotope ratio through anaerobic metabolism. Moreover, we compared the trophic enrichment in ¹⁵N between alanine and glutamic acid in natural samples to visualize the contribution of anaerobic metabolism in food webs. In the in vitro enzymatic deamination of alanine, the isotope ratios of alanine are gradually increased, with the α of 0.9923. In the culture of the eukaryote Saccharomyces cerevisiae and the bacterium Lactococcus lactis with organic substrates under hypoxic conditions, the enrichment in ¹⁵N is negligibly small for glutamic acid (by ~ 0‰), but considerably large for alanine (by ~ 5‰) in the culture. These results demonstrate that the activity of anaerobic metabolism is recorded in the isotope ratios of alanine but not glutamic acid in organisms. Moreover, we visualize the contribution of anaerobic metabolism in natural samples: (1) hypoxia within pollen provision for the diet of bee larvae induces a large enrichment in ¹⁵N of alanine; and (2) this ‘anaerobic’ enrichment in ¹⁵N can be identified in the cross-plot of the isotope ratios for alanine and glutamic acid in marine and terrestrial species, dissolved organic nitrogen, and the bees that potentially record of hypoxia within their diets. Thus, we suggest that the comparison of the isotope ratios between alanine and glutamic acid can be useful for evaluating the experience of hypoxia and the activity of anaerobic metabolism in biological and environmental samples.
• A compound-specific method for measuring the stable carbon isotopic composition of amino acids: elimination of the effect of isotopic fractionation during derivatization
  Yoshito Chikaraishi; Hyuntae Choi; Nayeon Park; Yuko Takizawa
  Progress in Earth and Planetary Science, 12, 1, Springer Science and Business Media LLC, 2025年09月30日
  英語, 研究論文（学術雑誌）, Abstract
  
  Compound-specific isotope analysis (CSIA) of carbon and nitrogen within amino acids by gas chromatography/isotope ratio mass spectrometry (GC/IRMS) has been employed as a powerful tool for estimating the trophic tendency and resource utilization of organisms in food webs, as well as for illustrating the metabolic fate of amino acids and associated energy flux in diverse levels from within a single organism to entire ecosystems. However, the polar functional groups (i.e., carboxyl, amino, and hydroxyl groups) of amino acids should be neutralized by derivatization (i.e., esterification followed by acylation) before injection into a GC/IRMS instrument, which has caused several serious issues. For instance, the toxicity of acylation reagents (e.g., pivaloyl chloride) and the fluorinated derivatives (e.g., derived from trifluoroacetic anhydride) have complicated the use of isotope ratio analysis of amino acids in our studies. Moreover, large isotopic fractionation in ¹³C/¹²C associated with the acylation has considerably reduced the accuracy of the analysis of carbon isotope ratios. In the present study, we therefore developed a new derivatization method to minimize these issues, which can reduce the isotopic fractionation in ¹³C/¹²C by following two sequential reactions for the acylation: the first is acylation, which introduces isotopic fractionation, and the second is replacement of the pivaloyl group with that of pivalic anhydride. Further, the contribution of the ¹³C/¹²C ratios of derivative groups (i.e., isopropyl and pivaloyl groups) can be completely removed by a simultaneous mass balance calculation. Also, the new method is relatively safe, without the use of toxic reagents and the production of fluorinated derivatives. Thus, this derivatization method can be useful for CSIA of amino acids in diverse studies, which promises to provide unprecedented accuracy in understanding the complex physiological, ecological, and geochemical dynamics across aquatic and terrestrial ecosystems.
• A large elevation in 15N/14N of collagenous amino acids: an insight from starvation experiments of marine organisms
  Hyuntae Choi; Yuko Takizawa; Nayeon Park; Yoshito Chikaraishi
  Progress in Earth and Planetary Science, 12, 1, 2025年02月05日
  英語, 研究論文（学術雑誌）
• Essential amino acid carbon isotope ratios as indicators of marine macrophyte response to environmental variation
  Hee Young Yun; Sangil Kim; Hyuntae Choi; Ji-Eun Kim; Sang Rul Park; Kyung-Hoon Shin
  Frontiers in Marine Science, 2024年08月23日
  研究論文（学術雑誌）, IntroductionThe carbon isotope ratios (δ13C) of essential amino acids (EAAs), including valine, leucine, isoleucine, threonine, and phenylalanine, in producers are crucial for explaining food-web structures in marine ecosystems. However, few studies have tested the variability of δ13C-EAA values in marine macrophytes, such as seagrass and macroalgae, under changing environmental conditions.MethodsIn this study, we examined the responses of δ13C-EAA values in macrophytes to environmental changes and explored their usefulness in characterizing macrophyte groups and local environments. We tested seagrass and macroalgae collected at different spatial and temporal scales in the field, as well as lab-cultured Ulva algae at various temperature gradients (12°C, 20°C, and 27.5°C) with additional nitrogen sources.ResultsWe found that δ13C-EAA values in macroalgae were significantly altered by seasonality and the interactive effects of temperature and nitrogen addition in comparison with mean-centered δ13C-EAA values (normalized δ13C-EAA values relative to the mean of the overall EAAs). The δ13C-EAA values detected in macroalgae within a local environment correlated with those of a co-occurring grazer, Caprella. Based on mean-centered δ13C-EAA values, macrophyte groups were distinguishable from other group (i.e., the bacteria group) even under diverse environmental conditions. Moreover, the seagrass group did not overlap with the green and the brown macroalgal group, but overlapped considerably with the red macroalgal group.DiscussionThese results suggest that the macrophyte-specific mean-centered δ13C-EAA values may be fairly consistent across broad spatial and temporal scales. Despite significant variation in δ13C-EAA values, the consistency in mean-centered δ13C-EAA values among specific macrophyte groups provides valuable insight into the characteristics of local trophic bases in regions under pressure from dramatic environmental changes.
• Integrated approach for the isotope trophic position of black-tailed gull (Larus crassirostris) eggs over a decade: Combining stable isotopes of amino acids and fatty acids composition
  Dokyun Kim; Jangho Lee; Eun-Ji Won; Soo Yong Lee; Ha-Eun Cho; Hyuntae Choi; Kyung-Hoon Shin
  Science of The Total Environment, 2024年02月
  英語, 研究論文（学術雑誌）
• Trophic variability of inter- and intra-copepod species in the South Sea of Korea during summer
  Hyuntae Choi; Seeryang Seong; Nayeon Park; Seunghan Lee; Dokyun Kim; Wonchoel Lee; Kyung-Hoon Shin
  Continental Shelf Research, 2024年02月
  研究論文（学術雑誌）
• Trophic diversity of chemosymbiont hosts in deep-sea hydrothermal vents using amino acid nitrogen isotopes
  Yeon Jee Suh; Se-Jong Ju; Min-Seob Kim; Hyuntae Choi; Kyung-Hoon Shin
  Frontiers in Marine Science, 2023年12月11日
  研究論文（学術雑誌）, Chemosymbiotic species inhabiting deep-sea hydrothermal vents are known to rely on microbial symbionts for nutrition. However, the relative contributions of heterotrophic energy sources to their diets remain poorly understood. In this study, we investigate the trophic positions (TP) of symbiont-bearing taxa, including vent mussels, snails, and shrimps, and examine the contribution of copepods and detrital organic matter (OM) to the food chain. Amino acid nitrogen isotopic compositions (δ15NAA) were used to investigate the TP of vent mussels (Bathymodiolus septemdierum and Gigantidas vrijenhoeki), snails (Alviniconcha spp.), and shrimps (Alvinocaris sp. and Rimicaris kairei) from two different vent environments. δ15NAA values in copepods and OM were also measured. Microbial resynthesis index (ΣV) was calculated to predict the contribution of reworked OM as an energy source to the hydrothermal vent ecosystem. Variations in TP were observed among vent mussels and snails from different vent environments, with higher TP in species from diffusing vents than in those from black smoker vents. Shrimps dwelling in a single diffusing vent exhibited distinct TP, suggesting that microhabitat and phylogeny may influence their energy acquisition. Notably, copepods occupied higher TPs than expected, possibly owing to the consumption of detrital OM. Our findings provide new insights into the trophic diversity of chemosymbiotic species in deep-sea hydrothermal vents and demonstrate the utility of δ15NAA analysis as a tool for unraveling food web dynamics and ecosystem functioning in these unique environments.
• Distribution of siphonophores in the Northwest Pacific Ocean and links to environmental conditions
  Nayeon Park; Hyuntae Choi; Kyung-Hoon Shin; Wonchoel Lee
  Frontiers in Marine Science, 10, Frontiers Media {SA}, 2023年09月15日
  研究論文（学術雑誌）, Despite their abundance in marine ecosystems, studies on siphonophores are limited. In this study, 26 species of siphonophores in the Northwest Pacific Ocean were identified during multiple cruises of the R/V ISABU from 2018–2020, and various factors that may affect the occurrence of siphonophores, including water temperature, salinity, zooplankton biomass, and trophic niche were investigated. Statistical analysis revealed that the distribution of siphonophores and their biomass could be divided into two water mass groups, affected by the Kuroshio and Oyashio Currents. The species with high contributions to distinguishing the water mass groups (including Chelophyes contorta, Dimophyes arctica, Bassia bassensis, and Eudoxoides spiralis—mainly belonging to the Diphyidae) showed species-specific correlations with water temperature and salinity. This suggests that diphyids can be used as indicator species for currents and hydrological factors that influence water mass. The biomass of siphonophores exhibited a trend opposite to that of non-gelatinous zooplankton and showed no association with other gelatinous zooplankton. These results can be interpreted from an ecological niche perspective. Through nitrogen and carbon stable isotope analyses, the dietary sources of siphonophores could potentially overlap with those of chaetognaths or non-gelatinous zooplankton. Because the trophic position of siphonophores (2.4–3.2) also falls in the range of those of chaetognaths (2.8–3.4) and non-gelatinous zooplankton including copepods, euphausiids, and amphipods (2.4–3.5), diet competition with carnivorous mesozooplankton could be predicted. Considering that the diversity and biomass of most siphonophores are strongly positively correlated with water temperature and salinity, expansion of the Kuroshio Current is expected to lead to an increase in siphonophores in the Northwest Pacific in the future. The findings of this study are anticipated to provide novel insights into climate change prediction and response and enhance our understanding of siphonophore communities.
• Seasonal dynamics of sinking organic matter in the Pacific Arctic Ocean revealed by nitrogen isotope ratios of amino acids
  Hyuntae Choi; Eun Jin Yang; Sung-Ho Kang; Dongseon Kim; Kyung-Hoon Shin
  Marine Chemistry, 253, 104252, 104252, Elsevier {BV}, 2023年06月
  英語, 研究論文（学術雑誌）
• Effects of temperature and starvation on life history traits and fatty acid profiles of the Antarctic copepod Tigriopus kingsejongensis
  Deok-Seo Yoon; Hyuntae Choi; Alaa El-Din H. Sayed; Kyung-Hoon Shin; Joung Han Yim; Sanghee Kim; Min-Chul Lee; Jae-Seong Lee
  Regional Studies in Marine Science, 57, 102743, 102743, Elsevier {BV}, 2023年01月
  英語, 研究論文（学術雑誌）
• Influences of Seasonal Variability and Potential Diets on Stable Isotopes and Fatty Acid Compositions in Dominant Zooplankton in the East Sea, Korea
  Jieun Kim; Hee-Young Yun; Eun-Ji Won; Hyuntae Choi; Seok-Hyeon Youn; Kyung-Hoon Shin
  Journal of Marine Science and Engineering, 2022年11月17日
  研究論文（学術雑誌）
• Microbial alteration in marine sediments: Insights from compound-specific isotopic compositions of amino acids in subseafloor environments
  Hyuntae Choi; Bohyung Choi; Yoshito Chikaraishi; Yoshinori Takano; Haryun Kim; Kitack Lee; Dhongil Lim; Kyung-Hoon Shin
  Frontiers in Marine Science, 9, Frontiers Media {SA}, 2022年11月14日
  研究論文（学術雑誌）, The proportion of amino acids (AAs) in sediment can be used as an indicator of microbial degradation, which is primarily the product of benthic prokaryote activity. The microbial activity would be reflected with the stable isotope ratio of nitrogen (δ15N) at the time of mineralization and resynthesis of AAs. In this study, the compound-specific isotope analysis of individual AAs was used to investigate δ15N variation associated with microbial processes in marine sediment samples. Our results showed a decrease in AA concentrations in core-top sediment was accompanied by an increase in δ15N values, suggesting large 15N enrichment in buried AAs. Phenylalanine displayed an increase in δ15N from the surface to depths greater than 2 cm, whereas relatively constant δ15N values at depths below 2 cm, suggesting that microbial utilization of phenylalanine varies with depth. Glycine showed the highest relative molar contribution (from 12.1 to 36.4%), with the largest δ15N increase (from 0.8 to 8.7) in deep sediment, implying that such information can serve as a measure of AA diagenesis in sedimentary environments. Our results also indicated that the δ15N values of individual AAs in sediment reflected the microbial alteration of organic matter at water-sediment interfaces and in sub-surface environments. These findings form an important basis for interpreting the δ15N values of AAs in sediment.
• Genome-wide identification of fatty acid synthesis genes, fatty acid profiles, and life parameters in two freshwater water flea Daphnia magna strains
  Deok-Seo Yoon; Eunjin Byeon; Duck-Hyun Kim; Yoseop Lee; Hyuntae Choi; Heum Gi Park; Alaa El-Din H. Sayed; Kyung-Hoon Shin; Min-Chul Lee; Jae-Seong Lee
  Comparative Biochemistry and Physiology Part B: Biochemistry and Molecular Biology, 262, 110774, 110774, Elsevier {BV}, 2022年10月
  英語, 研究論文（学術雑誌）
• Seasonal Trophic Dynamics of Sinking Particles in the Ulleung Basin of the East Sea (Japan Sea): An Approach Employing Nitrogen Isotopes of Amino Acids
  Hyuntae Choi; Jeomshik Hwang; Yeongjin Ryu; Guebuem Kim; Kyung-Hoon Shin
  Frontiers in Marine Science, 9, Frontiers Media {SA}, 2022年04月14日
  研究論文（学術雑誌）, To identify the sources of organic matter, we examined nitrogen isotopes of the amino acids of sinking particles collected from July 2017 to March 2018 at 1000 and 2250 m in the Ulleung Basin, the southwestern part of the East Sea (Japan Sea). Compared to the 1000 m samples, sinking particles at 2250 m were found to contain more resuspended sediment and underwent more microbial degradation. The signature of microbial degradation was significant in winter-early spring than in late summer-autumn. The source amino acids of sinking particles showed a substantial decline in the isotopic ratio during winter at both depths, suggesting changes in the nitrogen source for primary production. The average trophic positions (TPs) of sinking particles were larger at 1000 m (2.3 ± 0.3) than at 2250 m (1.9 ± 0.2), indicating that organic matter was mainly derived from fecal pellet and other organic debris from heterotrophs. In winter, the average TPs of sinking particles at 1000 m decreased below 2.0, which probably reflects the minimum zooplankton grazing in the euphotic layer. Sinking particles near the seafloor (2250 m) showed lower TP values than those at 1000 m, demonstrating that sinking particles at 2250 m are affected by lateral transport, particularly during winter. Our results show that the nitrogen isotope ratios of amino acids in sinking particles reflect the seasonal dynamics of both nitrogen sources and trophic structure in the water column.
• Effects of salinity and temperature on reproductivity and fatty acid synthesis in the marine rotifer Brachionus rotundiformis
  Min-Chul Lee; Deok-Seo Yoon; Jun Chul Park; Hyuntae Choi; Kyung-Hoon Shin; Atsushi Hagiwara; Jae-Seong Lee; Heum Gi Park
  Aquaculture, 546, 737282, 737282, Elsevier {BV}, 2022年01月
  英語, 研究論文（学術雑誌）
• Trophic Dynamics of Calanus hyperboreus in the Pacific Arctic Ocean
  Hyuntae Choi; Haemin Won; Jee‐Hoon Kim; Eun Jin Yang; Kyoung‐Ho Cho; Youngju Lee; Sung‐Ho Kang; Kyung‐Hoon Shin
  Journal of Geophysical Research: Oceans, 2021年03月
  研究論文（学術雑誌）
• Effects of low temperature on longevity and lipid metabolism in the marine rotifer Brachionus koreanus
  Min-Chul Lee; Deok-Seo Yoon; Yoseop Lee; Hyuntae Choi; Kyung-Hoon Shin; Heum Gi Park; Jae-Seong Lee
  Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, 250, 110803, 110803, Elsevier {BV}, 2020年12月
  英語, 研究論文（学術雑誌）
• Trophic Dynamics of Zooplankton Before and After Polar Night in the Kongsfjorden (Svalbard): Evidence of Trophic Position Estimated by δ15N Analysis of Amino Acids
  Hyuntae Choi; Sun-Yong Ha; Seunghan Lee; Jee-Hoon Kim; Kyung-Hoon Shin
  Frontiers in Marine Science, 7, Frontiers Media {SA}, 2020年07月21日
  研究論文（学術雑誌）
• Evaluation of the quantity and the carbon isotopic composition of amino acids by using diverse sample residues after lipid extraction
  Hee Young Yun; Dong-Hun Lee; Hyuntae Choi; Eunji Won; Kyung-Hoon Shin
  Analytical and Bioanalytical Chemistry, 412, 18, 4383, 4391, Springer Science and Business Media {LLC}, 2020年07月
  英語, 研究論文（学術雑誌）
• A comparative study of food selectivity of the benthic copepod Tigriopus japonicus and the pelagic copepod Paracyclopina nana: A genome-wide identification of fatty acid conversion genes and nitrogen isotope investigation
  Min-Chul Lee; Hyuntae Choi; Jun Chul Park; Deok-Seo Yoon; Yoseop Lee; Atsushi Hagiwara; Heum Gi Park; Kyung-Hoon Shin; Jae-Seong Lee
  Aquaculture, 521, 734930, 734930, Elsevier {BV}, 2020年05月
  英語, 研究論文（学術雑誌）
• Multimedia distributions, bioaccumulation, and trophic transfer of microcystins in the Geum River Estuary, Korea: Application of compound-specific isotope analysis of amino acids
  Dokyun Kim; Seongjin Hong; Hyuntae Choi; Bohyung Choi; Jaeseong Kim; Jong Seong Khim; Hodong Park; Kyung-Hoon Shin
  Environment International, 133, 105194, 105194, Elsevier {BV}, 2019年12月
  英語, 研究論文（学術雑誌）
• Tributyltin Affects Retinoid X Receptor-Mediated Lipid Metabolism in the Marine Rotifer Brachionus koreanus
  Min-Chul Lee; Elza Fonseca; Jun Chul Park; Deok-Seo Yoon; Hyuntae Choi; Moonkoo Kim; Jeonghoon Han; Hyeon-Seo Cho; Kyung-Hoon Shin; Miguel L. Santos; Jee-Hyun Jung; Luis Filipe Castro; Jae-Seong Lee
  Environmental Science & Technology, 53, 13, 7830, 7839, American Chemical Society ({ACS}), 2019年07月02日
  英語, 研究論文（学術雑誌）
• Genome-wide characterization and expression of the elongation of very long chain fatty acid (Elovl) genes and fatty acid profiles in the alga (Tetraselmis suecica) fed marine rotifer Brachionus koreanus
  Min-Chul Lee; Jun Chul Park; Deok-Seo Yoon; Hyuntae Choi; Hee-Jin Kim; Kyung-Hoon Shin; Atsushi Hagiwara; Jeonghoon Han; Heum Gi Park; Jae-Seong Lee
  Comparative Biochemistry and Physiology Part D: Genomics and Proteomics, 30, 179, 185, Elsevier {BV}, 2019年06月
  英語, 研究論文（学術雑誌）
• Lipid metabolism modulation by five different food types in the monogonont marine rotifer Brachionus koreanus
  Min-Chul Lee; Jun Chul Park; Deok-Seo Yoon; Hyuntae Choi; Kyung-Hoon Shin; Hee-Jin Kim; Atsushi Hagiwara; Jae-Seong Lee
  Aquaculture, 503, 596, 601, Elsevier {BV}, 2019年03月
  英語, 研究論文（学術雑誌）

• Diet nutrition shifts carbon isotope ratios of glucose: resource allocation between sugars and amino acids in organisms
  Hyuntae Choi
  The Association for the Sciences of Limnology and Oceanography (ASLO), 2026年05月15日, 英語, 口頭発表（一般）
  2026年05月12日 - 2026年05月16日
• Development of compound-specific isotope analysis of monosaccharides: from technical challenges to applications
  Hyuntae Choi
  International Symposium on Isotope Physiology, Ecology, and Geochemistry (IsoPEG) 2025, 2025年06月18日, 英語, 口頭発表（招待・特別）
  2025年06月16日 - 2025年06月20日, ［招待講演］
• A large elevation in nitrogen isotope ratios of collagenous amino acids from starvation of marine organisms
  Hyuntae Choi
  International Symposium on Isotope Physiology, Ecology, and Geochemistry (IsoPEG) 2025, 2025年06月16日, 英語, 口頭発表（一般）
  2025年06月16日 - 2025年06月20日

  
  発表資料
• Development of compound-specific isotope analysis of sugars: for illustrating nutritional cycles between sugars and amino acids in organisms
  Hyuntae Choi
  The Association for the Sciences of Limnology and Oceanography (ASLO), 2024年06月04日, 英語, 口頭発表（一般）
  2024年06月02日 - 2024年06月07日
• Geographical variations in basal producer and nitrogen source using calanoid copepod Calanus spp. in the northwest Pacific Ocean and Arctic Ocean
  Hyuntae Choi; Bohyung Choi; Jee-Hoon Kim; Nayeon Park; Haemin Won; Jieun Kim; Jinyoung Jung; Eun Jin Yang; Min-Seob Kim; Wonseok Yang; Yeonjung Lee; Jae Hoon Noh; Kyung-Hoon Shin
  International Symposium on Isotope Ecology and Environmental Science, 2024年01月23日, Hanyang University, Lotte world aquarium, Hokkaido University, 英語, 口頭発表（招待・特別）
  2024年01月23日 - 2024年01月24日, Ansan, Gyunggi-do, 大韓民国, ［招待講演］
• Short-term variations in trophic dynamics of zooplankton in response to freshwater discharge in a highly altered estuary
  Hyuntae Choi; Sehee Kim; Jinhjee Wi; Yongsik Sin; Kyung-Hoon Shin
  The Association for the Sciences of Limnology and Oceanography (ASLO), 2023年06月09日, 英語, 口頭発表（一般）
  2023年06月04日 - 2023年06月09日
• Nitrogen isotope baseline isoscape using amino acid nitrogen isotope of copepod Calanus
  Hyuntae Choi; Bohyung Choi; Jee-Hoon Kim; Nayeon Park; Haemin Won; Eun Jin Yang; Min-Seob Kim; Yeonjung Lee; Kyung-Hoon Shin
  PICES-2022, 2022年09月29日, 英語, 口頭発表（一般）
  2022年09月23日 - 2022年10月02日
• Seasonal Dynamics of Sinking Organic Matter in the Pacific Arctic Ocean Revealed by Nitrogen Isotope Ratios of Amino Acids
  Hyuntae Choi; Eun Jin Yang; Sung-Ho Kang; Dongseon Kim; Kyung-Hoon Shin
  International Symposium on Polar Sciences (ISPS), 2022年09月20日, 英語, ポスター発表
  2022年09月20日 - 2022年09月21日

  
  発表資料
• Inter- and Intra-species trophic variability of copepods in the Korea Strait
  Hyuntae Choi; Seeryang Seong; Nayeon Park; Seunghan Lee; Dokyun Kim; Wonchoel Lee; Kyung-Hoon Shin
  International Symposium on Isotope Physiology, Ecology, and Geochemistry (IsoPEG) 2022, 2022年08月29日, 英語, 口頭発表（一般）
  2022年08月26日 - 2022年09月02日, ［招待講演］

  
  発表資料
• A changing nitrogen source for phytoplankton in the central Yellow Sea revealed by Compound-Specific Isotope Analysis of amino acids
  Hyuntae Choi; Bohyung Choi; Yoshito Chikaraishi; Yoshinori Takano; Haryun Kim; Kitack Lee; Dhong-Il Lim; Kyung-Hoon Shin
  International Meeting on Organic Geochemistry, 2019年09月04日, 英語, ポスター発表
  2019年09月01日 - 2019年09月06日

  
  発表資料
• Trophic position of zooplankton in the polar night of the Kongsfjorden (Svalbard) revealed by δ15N analysis of amino acid
  Hyuntae Choi; Sun-Yong Ha; Seunghan Lee; Jee-Hoon Kim; Kyung-Hoon Shin
  International Symposium on Isotope Physiology, Ecology, and Geochemistry 2019, 2019年06月24日, 英語, 口頭発表（一般）
  2019年06月24日 - 2019年06月27日
• A changing nitrogen source for phytoplankton in the central Yellow Sea revealed by Compound-Specific Isotope Analysis of amino acids
  Hyuntae Choi; Bohyung Choi; Yoshito Chikaraishi; Yoshinori Takano; Haryun Kim; Kitack Lee; Dhong-Il Lim; Kyung-Hoon Shin
  Ocean Sciences Meeting, 2018年02月13日, 英語, ポスター発表
  2018年02月11日 - 2018年02月16日

  
  発表資料
• Trophic position assessment in open and closed estuarine ecosystem after rainy season using compound-specific isotope analysis of amino acids
  Hyuntae Choi; Bohyung Choi; Yoshito Chikaraishi; Min-Seob Kim; Kyung-Hoon Shin
  The Association for the Sciences of Limnology and Oceanography (ASLO), 2017年03月01日, 英語, 口頭発表（一般）
  2017年02月26日 - 2017年03月03日

  
  発表資料

• 糖の安定同位体比測定法の確立とその海洋物質循環への応用
  科学研究費助成事業
  2025年07月 - 2027年03月
  CHOI HYUNTAI
  日本学術振興会, 研究活動スタート支援, 北海道大学, 研究代表者, 25K23389