Advancing the Sea Ice Hypothesis: Trophic Interactions Among Breeding Pygoscelis Penguins With Divergent Population Trends Throughout the Western Antarctic Peninsula.

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Publisher: Frontiers Research Foundation
Document Type: Article
Length: 421 words
Lexile Measure: 2030L

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Author(s): Kristen B. Gorman, Kate E. Ruck, Tony D. Williams, William R. Fraser

We evaluated annual and regional variation in the dietary niche of <italic>Pygoscelis</italic> penguins including the sea ice-obligate Adélie penguin (<italic>Pygoscelis adeliae</italic>), and sea ice-intolerant chinstrap (<italic>Pygoscelis antarcticus</italic>) and gentoo (<italic>Pygoscelis papua</italic>) penguins, three species that nest throughout the western Antarctic Peninsula (AP) to test the <italic>sea ice trophic interaction hypothesis</italic>, which posits that penguin breeding populations with divergent trends, i.e., declining or increasing, are reliant on differing food webs. Our study relies on values of naturally occurring carbon (<sup>13</sup>C/<sup>12</sup>C, [DELTA]<sup>13</sup>C) and nitrogen (<sup>15</sup>N/<sup>14</sup>N, [DELTA]<sup>15</sup>N) stable isotopes as integrated proxies of penguin food...

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Gale Document Number: GALE|A674715669