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The MeHg body burden in birds is the balance of ingestion and excretion, and MeHg in feathers is an effective indicator of overall MeHg burden. Ivory gulls (<jats:italic>Pagophila eburnea<\/jats:italic>), which consume ice-associated prey and scavenge marine mammal carcasses, have the highest egg Hg concentrations of any Arctic bird, and the species has declined by more than 80% since the 1980s in Canada. We used feathers from museum specimens from the Canadian Arctic and western Greenland to assess whether exposure to MeHg by ivory gulls increased from 1877 to 2007. Based on constant feather stable-isotope (<jats:italic>\u03b4<\/jats:italic><jats:sup>13<\/jats:sup>C,<jats:italic>\u03b4<\/jats:italic><jats:sup>15<\/jats:sup>N) values, there was no significant change in ivory gulls' diet over this period, but feather MeHg concentrations increased 45\u00d7 (from 0.09 to 4.11 \u00b5g g<jats:sup>\u22121<\/jats:sup>in adults). This dramatic change in the absence of a dietary shift is clear evidence of the impact of anthropogenic Hg on this high-latitude threatened species. Bioavailable Hg is expected to increase in the Arctic, raising concern for continued population declines in high-latitude species that are far from sources of environmental contaminants.<\/jats:p>","DOI":"10.1098\/rspb.2015.0032","type":"journal-article","created":{"date-parts":[[2015,3,18]],"date-time":"2015-03-18T11:17:32Z","timestamp":1426677452000},"page":"20150032","update-policy":"https:\/\/doi.org\/10.1098\/crossmark-policy","source":"Crossref","is-referenced-by-count":82,"title":["Rapidly increasing methyl mercury in endangered ivory gull (<i>Pagophila eburnea<\/i>) feathers over a 130 year record"],"prefix":"10.1098","volume":"282","author":[{"given":"Alexander L.","family":"Bond","sequence":"first","affiliation":[{"name":"Department of Biology, University of Saskatchewan, 112 Science Place, Saskatoon, Saskatchewan, Canada S7N 5E2"},{"name":"Environment Canada, 11 Innovation Boulevard, Saskatoon, Saskatchewan, Canada S7N 3H5"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Keith A.","family":"Hobson","sequence":"additional","affiliation":[{"name":"Environment Canada, 11 Innovation Boulevard, Saskatoon, Saskatchewan, Canada S7N 3H5"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Brian A.","family":"Branfireun","sequence":"additional","affiliation":[{"name":"Department of Biology and Centre for Environment and Sustainability, Western University, Biological and Geological Sciences Building, London, Ontario, Canada N6A 5B7"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"175","published-online":{"date-parts":[[2015,4,22]]},"reference":[{"key":"e_1_3_6_2_2","doi-asserted-by":"publisher","DOI":"10.1579\/0044-7447(2007)36[19:ASOPAU]2.0.CO;2"},{"key":"e_1_3_6_3_2","doi-asserted-by":"publisher","DOI":"10.1126\/science.1242838"},{"key":"e_1_3_6_4_2","volume-title":"AMAP assessment 2011: mercury in the Arctic","author":"AMAP","year":"2011"},{"key":"e_1_3_6_5_2","doi-asserted-by":"publisher","DOI":"10.1021\/es305071v"},{"key":"e_1_3_6_6_2","first-page":"409","volume-title":"Handbook of ecotoxicology","author":"Weiner JG","year":"2003"},{"key":"e_1_3_6_7_2","first-page":"485","volume-title":"Biology of marine birds","author":"Burger J","year":"2002"},{"key":"e_1_3_6_8_2","doi-asserted-by":"publisher","DOI":"10.1021\/es000114a"},{"key":"e_1_3_6_9_2","doi-asserted-by":"publisher","DOI":"10.1016\/0025-326X(86)90801-5"},{"key":"e_1_3_6_10_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0269-7491(98)00078-5"},{"key":"e_1_3_6_11_2","doi-asserted-by":"publisher","DOI":"10.1016\/0025-326X(84)90419-3"},{"key":"e_1_3_6_12_2","doi-asserted-by":"publisher","DOI":"10.2307\/2404350"},{"key":"e_1_3_6_13_2","doi-asserted-by":"publisher","DOI":"10.1073\/pnas.1013865108"},{"key":"e_1_3_6_14_2","doi-asserted-by":"publisher","DOI":"10.1016\/0025-326X(85)90509-0"},{"key":"e_1_3_6_15_2","doi-asserted-by":"publisher","DOI":"10.1675\/063.037.sp117"},{"key":"e_1_3_6_16_2","doi-asserted-by":"publisher","DOI":"10.1007\/s00244-008-9185-7"},{"key":"e_1_3_6_17_2","doi-asserted-by":"publisher","DOI":"10.1023\/A:1024485829174"},{"key":"e_1_3_6_18_2","first-page":"25","article-title":"A review of analytical methods for the determination of mercury, arsenic, and pesticide residues on museum objects","volume":"16","author":"Parker PT","year":"2001","journal-title":"Collect. 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