Hothem Roger L, Bergen Darrin R, Bauer Marissa L, Crayon John J, Meckstroth Anne M
U.S. Geological Survey, Western Ecological Research Center, Dixon Field Station, 6924 Tremont Road, Dixon, CA 95620, USA.
Bull Environ Contam Toxicol. 2007 Dec;79(6):628-32. doi: 10.1007/s00128-007-9304-6. Epub 2007 Nov 29.
We collected two species of crayfish, Pacifastacus leniusculus and Procambarus clarkii, from Cache and Putah Creeks, California, and analyzed them for mercury and trace elements. Trace elements were higher in carcasses in 40 cases, higher in tails in 5 cases, and not different in 35 cases; no concentration exceeded levels considered harmful. Mercury concentrations were similar among sites, with no overall sex or species effect in tails. Mercury and methylmercury concentrations were higher in tails at all sites. Methylmercury concentrations in crayfish tails (0.156-0.256 microg/g) exceeded concentrations reported in health advisories for consumption of fish and crayfish from these watersheds.
我们从加利福尼亚州的卡什溪和普塔溪采集了两种小龙虾，即美洲鳌虾和克氏原螯虾，并对它们进行了汞和微量元素分析。在40例中，微量元素在虾体中的含量较高，在5例中，微量元素在虾尾中的含量较高，在35例中两者无差异；没有任何浓度超过被认为有害的水平。各采样点的汞浓度相似，虾尾中总体上不存在性别或物种差异。所有采样点虾尾中的汞和甲基汞浓度都较高。小龙虾虾尾中的甲基汞浓度（0.156 - 0.256微克/克）超过了这些流域鱼类和小龙虾消费健康建议中报告的浓度。
