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Trophic niche of seabirds on the Barton Peninsula, King George Island, Antarctica

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Trophic niche of seabirds on the Barton Peninsula, King George Island, Antarctica
Other Titles
남극 킹조지섬 바톤 반도 서식 조류의 생태 지위 연구
Gal, Jong-Ku
Choi, Bohyung
Kim, Bo Kyung
Jung, Jin-Woo
Min, Jun-Oh
Lee, Won Young
Shin, Kyung-Hoon
Kim, Jeong-Hoon
Ha, Sun-Yong
Marine & Freshwater BiologyOceanography
Antarctic PeninsulaAntarctic seabirdsIsotopic nicheStable isotope analysisTrophic position
Issue Date
Gal, Jong-Ku, et al. 2021. "Trophic niche of seabirds on the Barton Peninsula, King George Island, Antarctica". ESTUARINE COASTAL AND SHELF SCIENCE, 258: 1-8.
Drastic sea ice retreats in the Antarctic Peninsula, and the consequent environmental changes have brought about the consequences of biological adaptation and food competition. The isotopic niche is reflected by the ecological position and functional role of a species, which can be altered depending on these environmental changes. We assessed the isotopic niche and trophic positions (TP) of 3 seabirds on the Barton Peninsula, King George Island, Antarctica, to understand ecological interaction among the species. The average TP of Antarctic krill (Euphausia superba) (hereafter “krill”) (2.6 ± 0.1) was estimated by using the compiled published data of the compound-specific nitrogen isotope ratio of glutamic acid and phenylalanine in the Southern Ocean, and TP values of the seabirds based on that of krill to be reliable according to ecological knowledge. Our results on the overlap of the isotopic niches of seabirds suggests potential diet competition among the consumers, such as the brown skua (Stercorarius antarcticus) and south polar skua (Stercorarius maccormicki), whereas the distinct and broad isotopic niche width of kelp gulls (Larus dominicanus) suggesting that their adaptation through general- ization was related to their extended habitat and various food sources. Our research indicates that isotopic niche of seabirds reflects their survival strategy for food competition. Consequently, these seabirds can be easily influenced by alternative food sources, including terrestrial and human-derived sources, by rapid environmental changes, indicating that they are valuable as key environmental species and require long-term monitoring in the Antarctic Peninsula.
King Sejong Station
Appears in Collections  
2021-2021, Ecophysiology of Antarctic terrestrial organisms to reveal mechanisms of adaptation to changing environment (21-21) / Lee, Hyoungseok (PE21130)
2021-2021, Carbon cycle change and ecosystem response under the Southern Ocean warming (21-21) / Park, Jisoo (PE21110)
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