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首页> 外文期刊>Environmental toxicology and chemistry >MERCURY AND STABLE ISOTOPES OF CARBON AND NITROGEN IN MINK
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MERCURY AND STABLE ISOTOPES OF CARBON AND NITROGEN IN MINK

机译：貂中碳和氮的汞和稳定同位素

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摘要

Total Hg concentrations and values of stable isotopes (δ~(15)N, δ~(13)C) in tissues of mink (Mustela vison) captured in Rhode Island (USA) during winters of 1999 to 2004 were statistically distinct based on location. Mink captured in salt marsh environments (salt marsh group mink [SMGM]) had significantly lower mean Hg concentrations in liver and muscle tissue, and significantly higher δ~(15)N and δ~(13)C values in muscle, than those in corresponding samples of mink from upland freshwater locations (upland group mink [UPGM]). Stomach content samples obtained from the mink carcasses showed that fish, frogs, and crayfish were the dominant food items in UPGM, but in SMGM, fish predominated. Significant correlations were found for total Hg concentrations and stable isotope values between stomach contents and tissues. Comparisons of increases in Hg concentrations and δ~(15)N values from stomach contents to muscle tissue showed nonsignificant differences between UPGM and SMGM for Hg concentrations (SMGM, factor of 4.2; UPGM, factor of 3.9) and δ~(15)N values (SMGM, difference of 3.9%o; UPGM, difference of 3.1%o). These results suggest that the length of the trophic step and the extent of accumulation of Hg were approximately equal in both mink groups despite the differences in dietary composition and possible differences in accumulation of organic and inorganic Hg. The correspondence of stable isotope values and Hg concentrations between mink tissues and their stomach contents indicates that use of stomach content analysis to identify major prey items, followed by collection and analysis of appropriate field prey, may represent an approach for estimating Hg exposure to mink.
机译：1999年至2004年冬季，在美国罗德岛州捕获的貂皮中，总Hg浓度和稳定同位素（δ〜（15）N，δ〜（13）C）的值在统计上是不同的。在盐沼环境中捕获的水貂（盐沼水貂[SMGM]）在肝脏和肌肉组织中的平均Hg浓度显着较低，在肌肉中的δ〜（15）N和δ〜（13）C值明显高于来自陆地淡水地点的相应貂皮样品（陆地群貂[UPGM]）。从水貂尸体获得的胃液含量样本显示，鱼，青蛙和小龙虾是UPGM中的主要食物，而SMGM中则以鱼为主。胃内容物和组织之间的总汞浓度和稳定的同位素值之间存在显着的相关性。从胃内容物到肌肉组织的Hg浓度和δ〜（15）N值增加的比较显示，UPGM和SMGM的Hg浓度（SMGM，系数为4.2； UPGM，系数为3.9）和δ〜（15）N差异不显着。值（SMGM，差异为3.9％o； UPGM，差异为3.1％o）。这些结果表明，尽管饮食组成有所不同，有机和无机汞的积累可能存在差异，但两组貂的营养步骤长度和汞的积累程度大致相等。貂组织及其胃内容物之间稳定的同位素值和汞浓度的对应关系表明，使用胃内容物分析来识别主要猎物，然后收集和分析适当的野外猎物，可能代表估算汞暴露于貂皮中的方法。

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