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Carbon isotope ratios of amino acids (\u03b4\n                    <jats:sup>13<\/jats:sup>\n                    C\n                    <jats:sub>AA<\/jats:sub>\n                    ) in\n                    <jats:italic toggle=\"yes\">Calanus<\/jats:italic>\n                    spp. tissue revealed geographically distinct basal diets: N\n                    <jats:sub>2<\/jats:sub>\n                    -fixing organisms (19.6\u00a0\u00b1\u00a05.8%) and heterotrophic bacteria (30.6\u00a0\u00b1\u00a05.3%) in the tropical and subtropical Pacific, and dinoflagellates (54.4\u00a0\u00b1\u00a010.5%) in the Bering Strait and southern Chukchi Sea. The proportion of dinoflagellates in\n                    <jats:italic toggle=\"yes\">Calanus<\/jats:italic>\n                    spp. diets was strongly correlated with the dietary protist contribution estimated using nitrogen isotope ratios of amino acids (\u03b4\n                    <jats:sup>15<\/jats:sup>\n                    N\n                    <jats:sub>AA<\/jats:sub>\n                    ). In addition, nitrogen sources assimilated into total eukaryotic microalgae varied regionally: biologically fixed N\n                    <jats:sub>2<\/jats:sub>\n                    in the tropical Pacific (29.2\u00a0\u00b1\u00a07.9%), while nitrate was the primary source in the Pacific Arctic Ocean (91.4\u00a0\u00b1\u00a02.3%). By linking isotopic compositions to ecological function, this study provides insight into how regional nutrient shifts are altering planktonic food webs, with cascading consequences for marine biodiversity, biogeochemical cycling, and ecosystem resilience in a rapidly changing ocean.\n                  <\/jats:p>","DOI":"10.1126\/sciadv.aed3966","type":"journal-article","created":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T18:04:04Z","timestamp":1789754644000},"update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":0,"title":["Dietary records in cosmopolitan copepod\n                    <i>Calanus<\/i>\n                    spp. revealed large contribution of dinoflagellates in subarctic Pacific"],"prefix":"10.1126","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5647-5046","authenticated-orcid":true,"given":"Hyuntae","family":"Choi","sequence":"first","affiliation":[{"name":"Department of Marine Science and 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