荣成天鹅湖越冬大天鹅粪便的重金属水平

Heavy metal contents in the feces of whooper swans(Cygnus cygnus) overwintering in Swan Lake,Rongcheng

为对大天鹅（Cygnus cygnus）保护及湖区管理提供基础数据,作者于2011年11月~2012年3月研究了山东荣成天鹅湖越冬大天鹅食物来源及其粪便的重金属水平。结果表明：所选择的食物来源中, Zn、As和Cr在硬毛藻（Chaetomorpha linum）中含量最高, Cd在大叶藻（Zostera marina L.）叶片中含量最高, Pb在大叶藻根茎中含量最高, Cu在石莼（Ulva pertusa）中含量最高, Hg在小麦（Triticum aestivum）中含量最高；水生植物来源的粪便中 Cd 含量极显著高于陆地植物来源的粪便,陆地植物来源的粪便中Cr, Pb和Hg含量显著高于水生植物来源的粪便；摄食小麦苗可能造成大天鹅对Cd和Hg的积累。

The heavy metal contents in the food sources and feces of whooper swans （Cygnus cygnus） overwintering in Swan Lake, Rongcheng, from November 2011 through March 2012 were determined. Results showed that： （1） Zn, As and Cr in chaetomorpha （Chaetomorphalinum）, Cd in eelgrass （Zostera marina L.） blades, Pb in eelgrass rhizomes, Cu in ulva （Ulva pertusa）, and Hg in wheat seedlings （Triticum aestivum）, had the highest concentrations amongst the selected food sources; （2） the concentrations of Cd in feces of swan fed with aquatic diet were significantly higher than those fed with terrestrial diet; and the concentrations of Cr, Pb and Hg in feces of swan fed with terrestrial diet were significantly higher than those of aquatic diet; （3）C. cygnus could accumulate Cd and Hg by ingestion of wheat seedlings.