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Density distribution of feather stable isotope parameters. Density distributions, estimated from BANOVA models, of feather δ15N values of phenylalanine (δ15NPhe) and calculated trophic position (TPTDF-multi) of archived historic museum specimens of (A and C) chinstrap and (B and D) gentoo penguins collected in the Antarctic Peninsula region in the 1930s, 1960s, 1980s, and 2010s.
