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|Author(s):||Russell D. Day; David G. Roseneau; Stacy S. Vander-Pol; Keith A. Hobson; O.F.X Donard; Rebecca S. Pugh; Amanda J. Moors; Paul R. Becker;|
|Title:||Regional, Temporal, and Species Patterns of Mercury in Alaskan Seabird Eggs: Mercury Sources and Cycling or Food Web Effects?|
|Published:||March 04, 2012|
|Abstract:||Mercury concentration ([Hg]), δ15N, and δ13C were measured in eggs from common murres (Uria aalge), thick-billed murres (U. lomvia), glaucous gulls (Larus hyperboreus), and glaucous-winged gulls (L. glaucescens) collected throughout Alaska from 1999 to 2005. [Hg] was normalized to a common trophic level using egg δ15N values and published Hg trophic magnification factors. Murre eggs from the Gulf of Alaska, Cook Inlet, and Norton Sound had higher [Hg] than those from the Bering Sea and Bering Strait regions, independent of trophic level. The enrichment in egg [Hg] in Norton Sound is hypothesized to be from inputs from the Yukon River and other terrestrial Hg sources. Normalizing for trophic level generally eliminated or diminished differences in [Hg] among taxa, but temporal variability was unrelated to trophic level. These results indicate that normalizing murre egg [Hg] by trophic level improves the confidence in regional comparisons of Hg sources and biogeochemical cycling in Alaska.|
|Pages:||pp. 226 - 232|
|Keywords:||mercury, seabird, Alaska, carbon, nitrogen|
|DOI:||http://dx.doi.org/10.1016/j.envpol.2012.03.004 (Note: May link to a non-U.S. Government webpage)|