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Bulk tissue and amino acid stable isotope values of modern and historical Adélie penguin (Pygoscelis adeliae) feathers from the Ross Sea and Antarctic Peninsula regions (1840s to 2010s) Cite as Michelson, C., Emslie, S. D., Hart, T., McCarthy, M., McMahon, K., Patterson, W., & Polito, M. (2026) "Bulk tissue and amino acid stable isotope values of modern and historical Adélie penguin (Pygoscelis adeliae) feathers from the Ross Sea and Antarctic Peninsula regions (1840s to 2010s)" U.S. Antarctic Program (USAP) Data Center. doi: https://doi.org/None. Abstract This dataset contains measurements of bulk tissue carbon and nitrogen stable isotopes, compound-specific amino acid carbon and nitrogen stable isotopes, and calculated relative trophic positions from modern (2000–2016) and historical (1841–1995) breast feather samples of Adélie penguins (Pygoscelis adeliae). Samples were collected across multiple sites in the Ross Sea and Antarctic Peninsula regions of Antarctica. Historical feathers were sampled from museum study skin collections across 18 institutions, and modern feathers were collected from live-captured individuals or molted feather samples.Bulk stable isotope analysis (SIA) was conducted using elemental analyzer continuous flow isotope ratio mass spectrometry (EA-CF-IRMS). Compound-specific isotope analysis of amino acids (CSIA-AA) was performed using gas chromatography combustion isotope ratio mass spectrometry (GC-C-IRMS) for up to fourteen individual amino acids. Relative trophic position (TP) was calculated using baseline-corrected multi-trophic discrimination factor equations derived from glutamic acid and phenylalanine nitrogen stable isotope values. Details of the dataset, analytical methods, and ecological interpretations are provided in Michelson et al. 2026, Marine Ecology Progress Series, DOI: 10.3354/meps152331. Creator(s): Michelson, Chantel; McMahon, Kelton; Hart, Tom; Emslie, Steven D.; McCarthy, Matthew; Patterson, William; Polito, Michael Date Created: 2026-09-17 Repository: USAP-DC (current) License: Creative Commons Attribution Only v4.0 Generic [CC BY 4.0] Spatial Extent(s) West: -44.5, East: 164, South: -78.67, North: -60.72 Temporal Extent(s) Start: 1841-01-01 - End: 2016-12-31 Award(s) NSF 1443386 NSF 1443424 NSF 1443585 NSF 1826712 Version: 1 Related Project(s) Collaborative Research: Investigating Holocene Shifts in the Diets and Paleohistory of Antarctic Krill Predators References Michelson CI, McMahon KW, Hart T, Emslie SD, McCarthy MD, Patterson WP, Polito MJ (2026) Trophic stability of Adélie penguins through major historical changes in krill abundance. Marine Ecology Progress Series. (doi:10.3354/meps15233) Keywords Adelie Penguin Amino Acid Stable Isotope Analysis Antarctic Peninsula Antarctica Biota Cryosphere Pygoscelis Adeliae Ross Sea Trophic Position