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首页> 外文期刊>Environmental toxicology and chemistry >Concentrations of metals and trace elements in blood of spectacled and king eiders in northern Alaska, USA.
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Concentrations of metals and trace elements in blood of spectacled and king eiders in northern Alaska, USA.

机译：美国北部阿拉斯加眼镜鸭和国王绒毛血液中金属和微量元素的浓度。

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摘要

In 1996, we measured concentrations of arsenic, barium, cadmium, lead, mercury, and selenium in blood of adult king (Somateria spectabilis) and spectacled (Somateria fischeri) eiders and duckling spectacled eiders from northern Alaska, USA. Concentrations of selenium exceeded background levels in all adults sampled and 9 of 12 ducklings. Mercury was detected in all adult spectacled eiders and 5 of 12 ducklings. Lead concentrations were above the clinical toxicity threshold in one duckling (0.64 ppm) and two adult female spectacled eiders (0.54 and 4.30 ppm). Concentrations of cadmium and mercury varied between species; barium, cadmium, mercury, and selenium varied between sexes. In female spectacled eiders, mercury concentrations increased during the breeding season and barium and selenium levels decreased through the breeding season. Selenium declined at 2.3 +/- 0.9% per day and levels were lower in spectacled eiders arriving to the breeding grounds in northern Alaska than in western Alaska. The variation in selenium levels between breeding areas may be explained by differences in timing and routes of spring migration. Most trace elements for which we tested were not at levels currently considered toxic to marine birds. However, the presence of mercury and elevated lead in ducklings and adult female spectacled eiders suggests these metals are available on the breeding grounds.
机译：1996年，我们测量了来自美国阿拉斯加北部成年国王（Somateria spectabilis）和带眼镜（Somateria fischeri）的小鸭和带眼镜的小鸭的血液中砷，钡，镉，铅，汞和硒的浓度。在所有采样的成年人中，硒的浓度都超过了背景水平，每12只小鸭中就有9只。在所有成年眼镜鸭和12只小鸭中有5只检测到汞。一只鸭子（0.64 ppm）和两只成年雌性带眼镜的绒鸭（0.54和4.30 ppm）中的铅浓度均高于临床毒性阈值。镉和汞的浓度因物种而异。钡，镉，汞和硒的性别不同。在雌性带眼镜的绒鸭中，汞的浓度在繁殖季节增加，而钡和硒的水平在繁殖季节下降。硒每天下降2.3 +/- 0.9％，到达阿拉斯加北部繁殖地的戴眼镜的绒鸭的含量低于阿拉斯加西部。春季繁殖时间和途径的差异可以解释繁殖地区之间硒水平的变化。我们测试的大多数痕量元素目前未达到对海洋鸟类有毒的水平。但是，在小鸭和成年雌性眼镜鸭中，汞和铅含量较高，表明这些金属可在繁殖地获得。

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