| Elemental and Isotopic Signatures in the Sediments Influenced by Seal Excrement on Antarctic Fildes Peninsula and Their Po- tential Paleoecological Applications |
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| 作者姓名： | 刘晓东 孙立广 尹雪斌 谢周清 朱仁斌 王玉宏 |
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| 作者单位： | [1]Institute of Polar Environment, University of Science and Technology of China, Hefei 230026, China [2]National Institutes of Health, Maryland, U. S.A. 20892 |
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| 基金项目： | We would like to thank Polar 0ffice of National 0ceanic Bureau of China for support and assistance and 24 USTC students who counted a total of 360,000 seal hairs, a time-consuming and boring work. This study was supported by the National Natural Science Foundation （Grant No. 40476001 and 40231002）, China Postdoctoral Science foundation and KC Wang Eductional Foundation, Hong Kong. |
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| 摘 要： | The elemental and isotopic signatures in the sediments influenced by seal excrement on Antarctic Fildes Peninsula are examined for their potential palaeoecologlcal applications. The seal hair abundance in sediments exhibits remarkable fluctuation versus depth, indicating similar changes in historical populations of the seals visiting the marine terrace. The combination of δ^13 C, total organic carbon concentration （TOC）, total nitrogen concentration （TN） and atomic C/N ratio shows that the organic matters in sediments with numerous seal hairs have a marine origin and are predominantly derived from seal excrements. The large δ15 N values in sediments are attributed to trophic enrichment and NH3 vollatilization processes. The large variations in the δ^15 N values and the negative correlation between the δ15 N values and the seal hair abundances seem to be the results of changes in the paleoclimates and the volatilization rates of the ammonia produced in the seal excrements. The 87 Sr/86 Sr ratios in the acid-soluble fraction of sediments are interpreted as a mixture of the ones from the seal excrements （30%-50%） and the chemically weathered local bedrocks （70%-50%）. The calculated proportion of seal-derived Sr based on the ^87 Sr/^86 Sr ratios has a significant correlation with seal hair abundances in sediments. These results suggest that δ15 N values and the ^87 Sr/^86 Sr ratios in the acid-soluble fraction of sediments were influenced by seal excrements, similar to seal halt numbers, and thus can potentially be used to estimate the historical seal population in the Antarctic region.
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| 关 键 词： | 南极 沉积物 同位素 古生态学 |
| 收稿时间： | 2005-09-13 |
Elemental and Isotopic Signatures in the Sediments Influenced by Seal Excrement on Antarctic Fildes Peninsula and Their Potential Paleoecological Applications |
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| Liu Xiaodong,Sun Liguang,Yin Xuebin,Xie Zhouqing,Zhu Renbin,Wang Yuhong.Elemental and Isotopic Signatures in the Sediments Influenced by Seal Excrement on Antarctic Fildes Peninsula and Their Po- tential Paleoecological Applications[J].Chinese Journal of Polar Science,2005,16(2):121-134. |
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| Authors: | Liu Xiaodong Sun Liguang Yin Xuebin Xie Zhouqing Zhu Renbin Wang Yuhong |
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| Abstract: | The elemental and isotopic signatures in the sediments influenced by seal excrement on Antarctic Fildes Peninsula are examined for their potential palaeoecological applications. The seal hair abundance in sediments exhibits remarkable fluctuation versus depth, indicating similar changes in historical populations of the seals visiting the marine terrace. The combination of δ13 C, total organic carbon concentration (TOC), total nitrogen concentration (TN) and atomic C/N ratio shows that the organic matters in sediments with numerous seal hairs have a marine origin and are predominantly derived from seal excrements. The large δ15 N values in sediments are attributed to trophic enrichment and NH3 volatilization processes. The large variations in the δ15 N values and the negative correlation between the δ15 N values and the seal hair abundances seem to be the results of changes in the paleoclimates and the volatilization rates of the ammonia produced in the seal excrements. The 87 Sr/86 Sr ratios in the acid-soluble fraction of sediments are interpreted as a mixture of the ones from the seal excrements (30 %-50%) and the chemically weathered local bedrocks (70%-50%). The calculated proportion of seal-derived Sr based on the 87 Sr/86 Sr ratios has a significant correlation with seal hair abundances in sediments. These results suggest that δ15 N values and the 87 Sr/86 Sr ratios in the acid-soluble fraction of sediments were influenced by seal excrements, similar to seal hair numbers, and thus can potentially be used to estimate the historical seal population in the Antarctic region. |
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| Keywords: | Antarctica sediment seal excrement isotope ratios palaeoecology |
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