Bentzen Rebecca, Castellini J Margaret, Gerlach Robert, Dykstra Claude, O'Hara Todd
Institute of Arctic Biology, P.O. Box 757000, University of Alaska Fairbanks, Fairbanks, AK 99775-7000, USA; Arctic Beringia Program, Wildlife Conservation Society, P.O. Box 751110, Fairbanks, AK 99775, USA.
Department of Veterinary Medicine, P.O. Box 757750, University of Alaska Fairbanks, Fairbanks, AK 99775-7750, USA.
Mar Pollut Bull. 2016 Dec 15;113(1-2):110-116. doi: 10.1016/j.marpolbul.2016.08.068. Epub 2016 Sep 6.
Total mercury concentrations ([THg]), δN and δC values were determined in muscle of 693 Pacific halibut caught in International Pacific Halibut Commission setline surveys in Alaska (2002-2011). Project goals were to evaluate whether 1) δN and δC varied with region, age, sex and length of halibut, and 2) muscle [THg] varied with δN and δC (feeding ecology) while accounting for sex, length, and region. Variation in [THg] was explained, in part, by halibut feeding ecology as [THg] increased with trophic position (increasing δN). Halibut from the western Aleutian Island region were the exception, with overall lower δN values and significantly higher [THg] than halibut from other Alaskan waters. This [THg] pattern has been observed in other Aleutian biota, possibly the result of northeasterly atmospheric movement of mercury emissions from Asia and/or other local sources and processes. The significantly lower δN values for these halibut warrants further investigation of halibut prey.
测定了在阿拉斯加国际太平洋大比目鱼委员会延绳钓调查（2002 - 2011年）中捕获的693条太平洋大比目鱼肌肉中的总汞浓度（[THg]）、δN和δC值。项目目标是评估：1）δN和δC是否随大比目鱼的区域、年龄、性别和体长而变化；2）在考虑性别、体长和区域的情况下，肌肉[THg]是否随δN和δC（摄食生态）而变化。[THg]的变化部分可由大比目鱼的摄食生态来解释，因为[THg]随营养级升高（δN增加）而增加。阿留申群岛西部区域的大比目鱼是个例外，其δN值总体较低，[THg]显著高于阿拉斯加其他海域的大比目鱼。这种[THg]模式在阿留申群岛的其他生物群中也有观察到，这可能是亚洲汞排放的东北向大气迁移和/或其他本地来源及过程导致的结果。这些大比目鱼δN值显著较低，这值得进一步研究大比目鱼的猎物。
