USAP-DC

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Stable isotopes of Adelie Penguin chick bone collagen Data DOI: https://doi.org/10.15784/601913 Cite as Reaves, M., Powers, S., & Emslie, S. D. (2025) "Stable isotopes of Adelie Penguin chick bone collagen" U.S. Antarctic Program (USAP) Data Center. doi: https://doi.org/10.15784/601913. Abstract We completed multiple-stable isotope analyses (d13C, d15N, and d34S) of Adélie penguin Pygoscelis adeliae chick-bone collagen to characterize differences in foraging behavior among 15 colony locations across the Ross Sea region. Foraging behavior was represented by d13C, d15N, and d34S values and classified into groups using k-means cluster analyses. Additionally, we report the first stable isotope values for the Adélie penguin colony on Sabrina Island, Balleny Islands. Cluster analyses revealed distinct isotopic signatures for the northernmost and central colonies; however, owing to spatial and temporal variability, isotopic signatures were not strong enough to distinguish the southernmost colonies. Results also indicated that d15N values increased with latitude (66–77° S), corresponding to higher krill consumption at colonies that foraged in sensible heat polynyas or the open ocean and increased fish consumption for those foraging in latent heat polynyas to the south. Generally, d34S values are used to distinguish foraging grounds, specifically inshore/offshore foraging or foraging over the continental slope versus the continental shelf, in marine animals. Although the southern and central colonies currently forage along the continental shelf and the northern colonies forage over the shelf, slope, and/or open ocean, we found no significant difference in d34S values among colonies. While a positive correlation between d15N and d34S values was evident, d34S signatures did not exhibit distinct patterns specific to individual colonies or regions. The absence of a clear trend reflecting inshore/offshore foraging underscores the need for additional research to bridge this knowledge gap. Creator(s): Reaves, Megan; Powers, Shannon; Emslie, Steven D. Date Created: 2025-03-11 Repository: USAP-DC (current) License: Creative Commons Attribution Only v4.0 Generic [CC BY 4.0] Award(s) NSF 1443386 NSF 2135695 Version: 1 Related Project(s) Collaborative Research: Investigating Holocene Shifts in the Diets and Paleohistory of Antarctic Krill Predators Collaborative Research: Using Multiple Stable Isotopes to Investigate Middle to Late Holocene Ecological Responses by Adelie Penguins in the Ross Sea References Reaves, M., Powers, S., Emslie, S.D. Using multiple-stable isotopes (δ13C, δ15N, and δ34S) to assess past and present Adélie penguin foraging grounds in the Ross Sea region, Antarctica. Marine Ecology Progress Series. (doi:10.3354/meps14794) Keywords Adelie Penguin Antarctica Cryosphere Foraging Polynya Pygoscelis Adeliae Ross Sea Stable Isotopes