| Paleoecological implications of the nitrogen isotope signatures in the sediments amended by Antarctic seal excrements |
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| 引用本文： | LIU Xiaodong,SUN Liguang,YIN Xuebin,ZHU Renbin. Paleoecological implications of the nitrogen isotope signatures in the sediments amended by Antarctic seal excrements[J]. 自然科学进展(英文版), 2004, 14(9): 786-792. DOI: 10.1080/10020070412331344331 |
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| 作者姓名： | LIU Xiaodong SUN Liguang YIN Xuebin ZHU Renbin |
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| 作者单位： | Institute of Polar Environment, University of Science and Technology of China, Hefei 230026, China,Institute of Polar Environment, University of Science and Technology of China, Hefei 230026, China,Institute of Polar Environment, University of Science and Technology of China, Hefei 230026, China,Institute of Polar Environment, University of Science and Technology of China, Hefei 230026, China |
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| 摘 要： | The nitrogen isotope signatures in the sediments amended by seal excrements, from Fildes Peninsula of King George Islands, Antarctica, were examined for their paleoecological application potential. The contents of total organic carbon (TOC) and total nitrogen (TN) and the atomic C/N ratios in the sediments show that the organic carbon and nitrogen are predominantly of marine origin and derived from seal excrements. The remarkably high δ15N values in the sediments may be related to at least two important factors of trophic enrichment and NH3 volatilization, which requires further studies. The large variations in the seal hair abundances and the determinedδ15N values in the sediments signify similar changes of the historical seal populations around the study site. A significant negative correlation between the δ15N values and seal hair abundance was observed, and this suggests that the δ15N values, like the number of seal hairs,can be used as a paleoecological proxy for the historical seal populations. The time-integrated δ15N signatures in the sediments with predominantly animal-derived nitrogen source thus provide a new tool for estimating historical populations of seals and penguins and interpretlng the underlying paleoecological processes.
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| 关 键 词： | nitrogen isotope paleoecology seal excrement sediment sequence Antarctica |
Paleoecological implications of the nitrogen isotope signatures in the sediments amended by Antarctic seal excrements |
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| LIU Xiaodong,Sun Liguang,Yin Xuebin,ZHU Renbin. Paleoecological implications of the nitrogen isotope signatures in the sediments amended by Antarctic seal excrements[J]. Progress in Natural Science, 2004, 14(9): 786-792. DOI: 10.1080/10020070412331344331 |
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| Authors: | LIU Xiaodong Sun Liguang Yin Xuebin ZHU Renbin |
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| Affiliation: | Institute of Polar Environment, University of Science and Technology of China, Hefei 230026, China |
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| Abstract: | The nitrogen isotope signatures in the sediments amended by seal excrements, from Fildes Peninsula of King George Islands, Antarctica, were examined for their paleoecological application potential. The contents of total organic carbon (TOC) and total nitrogen (TN) and the atomic C/N ratios in the sediments show that the organic carbon and nitrogen are predominantly of marine origin and derived from seal excrements. The remarkably high δ15N values in the sediments may be related to at least two important factors of trophic enrichment and NH3 volatilization, which requires further studies. The large variations in the seal hair abundances and the determinedδ15N values in the sediments signify similar changes of the historical seal populations around the study site. A significant negative correlation between the δ15N values and seal hair abundance was observed, and this suggests that the δ15N values, like the number of seal hairs,can be used as a paleoecological proxy for the historical seal populations. The time-integrated δ15N signatures in the sediments with predominantly animal-derived nitrogen source thus provide a new tool for estimating historical populations of seals and penguins and interpretlng the underlying paleoecological processes. |
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| Keywords: | nitrogen isotope paleoecology seal excrement sediment sequence Antarctica |
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