DeVink Jean-Michel A, Clark Robert G, Slattery Stuart M, Wayland Mark
Department of Biology, University of Saskatchewan, 112 Science Place, Saskatoon, Saskatchewan S7N 5E2, Canada.
Environ Pollut. 2008 Mar;152(1):116-22. doi: 10.1016/j.envpol.2007.05.003. Epub 2007 Jun 20.
Elevated levels of selenium (Se) have been detected in wintering and spring-staging lesser scaup. Here, we compared spring scaup Se and mercury (Hg) levels to those of ring-necked ducks and white-winged scoters, species exhibiting increasing and decreasing boreal populations, respectively. Mercury concentrations were low in all three species. Geometric mean (95%CI) liver Se concentrations were 6.2 (5.5-7.0), 4.6 (4.0-5.4), and 32.6 (28.4-37.3)mg/kg dry weight (dw) in scaup, ringnecks and scoters, respectively. Only scoter livers (66%) were above 33 mg/kgdw Se. Scaup and ringneck Se levels were unrelated to breeding status or lipid and protein levels; breeding scoters and females with greater lipid mass had higher Se than non-breeders. Egg and follicle concentrations in scaup and scoters were normal (mean [95%CI]=2.3 [1.9-2.6] and 2.4 [2.1-2.7]mg/kgdw, respectively). Overall, we found no support for a relationship between selenium and boreal scaup and scoter declines, and discuss current Se threshold concentrations.
在越冬和春季停歇的小潜鸭体内检测到了较高水平的硒（Se）。在此，我们将春季小潜鸭的硒和汞（Hg）水平与环颈鸭和白翅斑背潜鸭进行了比较，这两种物种的北方种群数量分别呈增加和减少趋势。所有这三个物种的汞浓度都很低。小潜鸭、环颈鸭和白翅斑背潜鸭肝脏硒浓度的几何平均值（95%置信区间）分别为6.2（5.5 - 7.0）、4.6（4.0 - 5.4）和32.6（28.4 - 37.3）毫克/千克干重。只有白翅斑背潜鸭的肝脏（66%）硒含量高于33毫克/千克干重。小潜鸭和环颈鸭的硒水平与繁殖状态、脂质和蛋白质水平无关；繁殖期的白翅斑背潜鸭以及脂质含量较高的雌性白翅斑背潜鸭的硒含量高于非繁殖个体。小潜鸭和白翅斑背潜鸭的卵和卵泡中的硒浓度正常（平均值[95%置信区间]分别为2.3[1.9 - 2.6]和2.4[2.1 - 2.7]毫克/千克干重）。总体而言，我们没有发现硒与北方小潜鸭和白翅斑背潜鸭数量下降之间存在关联的证据，并讨论了当前的硒阈值浓度。
