Wayland M, Alisauskas R T, Kellett D, Traylor J, Swoboda C, Neugebauer E, Mehl K
Environment Canada, Prairie & Northern Region, 115 Perimeter Rd., Saskatoon, SK, S7N 0X4, Canada.
Environ Pollut. 2007 Dec;150(3):329-37. doi: 10.1016/j.envpol.2007.01.025. Epub 2007 Mar 21.
Sea duck populations have declined in North America. Contaminants, especially metals, have been listed as possible contributing factors. Sea ducks are long-lived. Thus, individuals chronically exposed to elevated metal levels may be at greatest risk. Information about long-term exposure (> or =1year) of individuals to metals is absent. To address this information gap, we examined year-to-year correlations among individual White-Winged Scoters and King Eiders in levels of blood cadmium, lead, mercury and selenium. Positive correlations (r> or =0.43), were found in six, five, five and two of seven correlations for cadmium, selenium, lead and mercury. Thus, certain individuals of these species may be exposed over two or more years to higher levels of cadmium, selenium and lead (but apparently not mercury) than other individuals. Single blood samples are appropriate metrics of exposure for studies that examine long-term effects of certain metals on these birds.
北美海鸭种群数量已经下降。污染物，尤其是金属，被列为可能的影响因素。海鸭寿命较长。因此，长期暴露于高金属水平的个体可能面临最大风险。目前缺乏关于个体长期（≥1年）接触金属的信息。为了填补这一信息空白，我们研究了白翅斑背潜鸭和王绒鸭个体血液中镉、铅、汞和硒水平之间逐年的相关性。镉、硒、铅和汞的七组相关性中，分别有六组、五组、五组和两组呈现正相关（r≥0.43）。因此，这些物种中的某些个体可能在两年或更长时间内比其他个体接触到更高水平的镉、硒和铅（但显然不是汞）。对于研究某些金属对这些鸟类的长期影响而言，单次血液样本是合适的接触指标。
