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Seabirds have been widely used to monitor the contamination of marine ecosystems. In the present study, we investigated Hg concentrations in blood, muscle, and feathers of 7 procellariform seabirds breeding on the Chatham Islands, New Zealand. Using bulk and compound-specific stable isotope ratios of carbon and nitrogen as a proxy of trophic position and distribution, we also tested whether Hg contamination is related to the species-specific feeding ecology. Mercury exposure varied widely within the seabird community. The highest contaminated species, the Magenta petrel, had approximately 29 times more Hg in its blood than the broad-billed prion, and approximately 35 times more Hg in its feathers than the grey-backed storm petrel. Variations of Hg concentrations in blood and feathers were significantly and positively linked to feeding habitats and trophic position, highlighting the occurrence of efficient Hg biomagnification processes along the food web. Species and feeding habitats were the 2 main drivers of Hg exposure within the seabird community. The Pterodroma species had high blood and feather Hg concentrations, which can be caused by their specific physiology and\/or because of their foraging behavior during the interbreeding period (i.e., from the Tasman Sea to the Humboldt Current system). These 2 threatened species are at risk of suffering detrimental effects from Hg contamination and further studies are required to investigate potential negative impacts, especially on their reproduction capability. Environ Toxicol Chem 2021;40:454\u2013472. \u00a9 2020 The Authors. Environmental Toxicology and Chemistry published by Wiley Periodicals LLC on behalf of SETAC.<\/jats:p>","DOI":"10.1002\/etc.4933","type":"journal-article","created":{"date-parts":[[2020,11,17]],"date-time":"2020-11-17T13:44:16Z","timestamp":1605620656000},"page":"454-472","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":27,"title":["Influence of Species-Specific Feeding Ecology on Mercury Concentrations in Seabirds Breeding on the Chatham Islands, New Zealand"],"prefix":"10.1093","volume":"40","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9623-0825","authenticated-orcid":false,"given":"Justine","family":"Th\u00e9bault","sequence":"first","affiliation":[{"name":"Littoral Environnement et Soci\u00e9t\u00e9s (LIENSs), UMR 7266 CNRS\u2013La Rochelle Universit\u00e9 La Rochelle France"},{"name":"Department of Animal Ecology and Systematics Justus Liebig University Giessen Giessen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paco","family":"Bustamante","sequence":"additional","affiliation":[{"name":"Institut Universitaire de France (IUF) Paris France"},{"name":"Littoral Environnement et Soci\u00e9t\u00e9s (LIENSs), UMR 7266 CNRS\u2013La Rochelle Universit\u00e9 La Rochelle France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9039-1268","authenticated-orcid":false,"given":"Melanie","family":"Massaro","sequence":"additional","affiliation":[{"name":"Institute for Land, Water and Society, School of Environmental Sciences, Charles Sturt University, Albury Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Graeme","family":"Taylor","sequence":"additional","affiliation":[{"name":"Department of Conservation Biodiversity Group Wellington New 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