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However, it is unclear how top predators will be impacted. We studied blood Hg concentrations of chick-rearing black-legged kittiwakes Rissa tridactyla (2000\u20132019) in Svalbard (Norway). From 2000 to 2019, Hg concentrations followed a U-shaped trend. The trophic level, inferred from nitrogen stable isotopes, and chlorophyll a (Chl a) concentrations better predicted Hg concentrations, with positive and U-shaped associations, respectively. As strong indicators of primary productivity, Chl a concentrations can influence production of upper trophic levels and, thus, fish community assemblage. In the early 2000s, the high Hg concentrations were likely related to a higher proportion of Arctic prey in kittiwake\u2019s diet. The gradual input of Atlantic prey in kittiwake diet could have resulted in a decrease in Hg concentrations until 2013. Then, a new shift in the prey community, added to the shrinking sea ice-associated release of MeHg in the ocean, could explain the increasing trend of Hg observed since 2014. The present monitoring provides critical insights about the exposure of a toxic contaminant in Arctic wildlife, and the reported increase since 2014 raises concern for Arctic seabirds.<\/jats:p>","DOI":"10.1021\/acs.est.1c07633","type":"journal-article","created":{"date-parts":[[2022,2,3]],"date-time":"2022-02-03T09:39:05Z","timestamp":1643881145000},"page":"2443-2454","source":"Crossref","is-referenced-by-count":30,"title":["A\nU\u2011Turn for Mercury Concentrations over 20\nYears: How Do Environmental Conditions Affect Exposure in Arctic Seabirds?"],"prefix":"10.1021","volume":"56","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4257-7495","authenticated-orcid":true,"given":"Sabrina","family":"Tartu","sequence":"first","affiliation":[{"name":"Centre d\u2019Etudes Biologiques de Chize\u0301 (CEBC), UMR 7372 CNRS, La Rochelle Universite\u0301 , ,","place":["Villiers-en-Bois, France, 79360"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pierre","family":"Ble\u0301vin","sequence":"additional","affiliation":[{"name":"Centre d\u2019Etudes Biologiques de Chize\u0301 (CEBC), UMR 7372 CNRS, La Rochelle Universite\u0301 , ,","place":["Villiers-en-Bois, France, 79360"]},{"name":"Akvaplan-niva AS , , ,","place":["Troms\u00f8, Norway, 9296"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3877-9390","authenticated-orcid":true,"given":"Paco","family":"Bustamante","sequence":"additional","affiliation":[{"name":"Littoral Environnement et Socie\u0301te\u0301s (LIENSs), UMR 7266 CNRS, La Rochelle Universite\u0301 , ,","place":["La\nRochelle, France, 17000"]},{"name":"Institut Universitaire de France (IUF) , ,","place":["Paris, France, 75005"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fre\u0301de\u0301ric","family":"Angelier","sequence":"additional","affiliation":[{"name":"Centre d\u2019Etudes Biologiques de Chize\u0301 (CEBC), UMR 7372 CNRS, La Rochelle Universite\u0301 , ,","place":["Villiers-en-Bois, France, 79360"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Claus","family":"Bech","sequence":"additional","affiliation":[{"name":"Norwegian University of Science and Technology (NTNU) , ,","place":["Trondheim, Norway, 7491"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jan Ove","family":"Bustnes","sequence":"additional","affiliation":[{"name":"Norwegian Institute for Nature Research (NINA) , , ,","place":["Troms\u00f8, Norway, 9296"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Melissa","family":"Chierici","sequence":"additional","affiliation":[{"name":"Institute of Marine Research (IMR) , , ,","place":["Troms\u00f8, Norway, 9296"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Agneta","family":"Fransson","sequence":"additional","affiliation":[{"name":"Norwegian Polar Institute , , ,","place":["Troms\u00f8, Norway, 9296"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Geir W.","family":"Gabrielsen","sequence":"additional","affiliation":[{"name":"Norwegian Polar Institute , , ,","place":["Troms\u00f8, Norway, 9296"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aure\u0301lie","family":"Goutte","sequence":"additional","affiliation":[{"name":"EPHE, PSL Research University, UMR 7619 METIS , ,","place":["Paris, France, F-75005"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"B\u00f8rge","family":"Moe","sequence":"additional","affiliation":[{"name":"Norwegian Institute for Nature Research (NINA) , ,","place":["Trondheim, Norway, 7034"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christophe","family":"Sauser","sequence":"additional","affiliation":[{"name":"Centre d\u2019Etudes Biologiques de Chize\u0301 (CEBC), UMR 7372 CNRS, La Rochelle Universite\u0301 , ,","place":["Villiers-en-Bois, France, 79360"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Julien","family":"Sire","sequence":"additional","affiliation":[{"name":"Centre d\u2019Etudes Biologiques de Chize\u0301 (CEBC), UMR 7372 CNRS, La Rochelle Universite\u0301 , ,","place":["Villiers-en-Bois, France, 79360"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christophe","family":"Barbraud","sequence":"additional","affiliation":[{"name":"Centre d\u2019Etudes Biologiques de Chize\u0301 (CEBC), UMR 7372 CNRS, La Rochelle Universite\u0301 , ,","place":["Villiers-en-Bois, France, 79360"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Olivier","family":"Chastel","sequence":"additional","affiliation":[{"name":"Centre d\u2019Etudes Biologiques de Chize\u0301 (CEBC), UMR 7372 CNRS, La Rochelle Universite\u0301 , ,","place":["Villiers-en-Bois, France, 79360"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2022,2,3]]},"reference":[{"key":"2026081414110550400_cit1","volume-title":"IPCC, 2001: Climate\nChange 2001: The Scientific Basis. 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