Regional, temporal, and species patterns of mercury in Alaskan seabird eggs: Mercury sources and cycling or food web effects?

详细信息	查看全文 | 推荐本文 |

• 作者：Rusty D. Day^a ; ^d ; ^{russell.day@nist.gov} ; David G. Roseneau^b ; Stacy S. Vander Pol^a ; Keith A. Hobson^c ; Olivier F.X. Donard^d ; Rebecca S. Pugh^a ; Amanda J. Moors^a ; Paul R. Becker^a
• 关键词：Mercury ; Carbon ; Nitrogen ; Seabird egg ; Trophic level
• 刊名：Environmental Pollution
• 出版年：2012
• 期刊代码：28_02697491
• 类别：env
• 出版时间：July, 2012
• 卷：166
• 期：Complete
• 页码：226-232
• 文件大小：819 K

摘要

Mercury concentration ([Hg]), 未¹⁵N, and 未¹³C values were measured in eggs from common murres (Uria aalge), thick-billed murres (U.聽lomvia), glaucous gulls (Larus hyperboreus), and glaucous-winged gulls (L.聽glaucescens) collected in Alaska from 1999 to 2005. [Hg] was normalized to a common trophic level using egg 未¹⁵N values and published Hg trophic magnification factors. Egg [Hg] was higher in murres from Gulf of Alaska, Cook Inlet, and Norton Sound regions compared to Bering Sea and Bering Strait regions, independent of trophic level. We believe the Yukon River outflow and terrestrial Hg sources on the southern Seward Peninsula are responsible for the elevated [Hg] in Norton Sound eggs. Normalizing for trophic level generally diminished or eliminated differences in [Hg] among taxa, but temporal variability was unrelated to trophic level. Normalizing murre egg [Hg] by trophic level improves the confidence in regional comparisons of Hg sources and biogeochemical cycling in Alaska.