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Gull eggs have been used to assess contaminant spatial patterns and sources, but such assessments must consider how organism trophic position may influence spatial inferences. Stable nitrogen isotopes (\u03b415N) in bulk tissue are routinely used in this context. However, bulk \u03b415N values are only useful if spatial differences in baseline \u03b415N values are considered. Amino acid compound\u2013specific stable nitrogen isotope analysis can generate estimates of baseline \u03b415N values and trophic position from the same sample. In the present study, eggs (n\u2009=\u2009428) of California (Larus californicus), herring (Larus argentatus smithsonianus), and ring-billed (Larus delawarensis) gulls were used to assess spatial patterns in mercury (Hg) availability in 12 western Canadian lakes located over 14 degrees of latitude, with amino acid compound\u2013specific stable isotope analysis adjustment of egg Hg levels for trophic position. Mean trophic position\u2013adjusted egg Hg levels (micrograms per gram, dry wt) were greatest at sites in receiving waters of the Athabasca River (X\u00af\u2009=\u20090.70) compared to southern (X\u00af\u2009=\u20090.39) and northern (X\u00af\u2009=\u20090.50) regions. Research is required to investigate factors (e.g., local Hg released as a result of human activities, processes influencing Hg methylation) which may be responsible for greater Hg availability in the lower Athabasca River basin. However, it is clear that amino acid compound\u2013specific stable isotope analysis is a valuable tool for assessing contaminant spatial patterns. Environ Toxicol Chem 2018;37:1466\u20131475. \u00a9 2018 SETAC<\/jats:p>\n                  <jats:p>Abstract<\/jats:p>\n                  <jats:p\/>\n               <\/jats:sec>","DOI":"10.1002\/etc.4113","type":"journal-article","created":{"date-parts":[[2018,2,15]],"date-time":"2018-02-15T11:26:50Z","timestamp":1518694010000},"page":"1466-1475","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":38,"title":["Spatial trends in a biomagnifying contaminant: Application of amino acid compound\u2013specific stable nitrogen isotope analysis to the interpretation of bird mercury levels"],"prefix":"10.1093","volume":"37","author":[{"given":"Svetlana","family":"Dolgova","sequence":"first","affiliation":[{"name":"Science and Technology BranchNational Wildlife Research CentreEnvironment and Climate Change Canada Ottawa Ontario Canada"},{"name":"Department of BiologyCarleton University Ottawa Ontario Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Brian N.","family":"Popp","sequence":"additional","affiliation":[{"name":"Department of Geology and GeophysicsUniversity of Hawaii Honolulu Hawaii USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kevin","family":"Courtoreille","sequence":"additional","affiliation":[{"name":"Mikisew Cree First Nation Community-Based Monitoring Program Fort Chipewyan Alberta Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Richard H.M.","family":"Espie","sequence":"additional","affiliation":[{"name":"Saskatchewan Environment Regina Saskatchewan Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bruce","family":"Maclean","sequence":"additional","affiliation":[{"name":"Mikisew Cree First Nation Community-Based Monitoring Program Fort Chipewyan Alberta Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mark","family":"McMaster","sequence":"additional","affiliation":[{"name":"Science and Technology BranchEnvironment and Climate Change Canada Burlington Ontario Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jason R.","family":"Straka","sequence":"additional","affiliation":[{"name":"Parks Canada AgencyWood Buffalo National Park Fort Chipewyan Alberta Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gerald R.","family":"Tetreault","sequence":"additional","affiliation":[{"name":"Science and Technology BranchEnvironment and Climate Change Canada Burlington Ontario Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Steve","family":"Wilkie","sequence":"additional","affiliation":[{"name":"Saskatchewan Environment Regina Saskatchewan Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8216-8346","authenticated-orcid":false,"given":"Craig E.","family":"Hebert","sequence":"additional","affiliation":[{"name":"Science and Technology BranchNational Wildlife Research CentreEnvironment and Climate Change Canada Ottawa Ontario Canada"},{"name":"Department of BiologyCarleton University Ottawa Ontario Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"286","published-online":{"date-parts":[[2018,2,15]]},"reference":[{"key":"2025010314530846900_etc4113-bib-0001","doi-asserted-by":"crossref","first-page":"2052","DOI":"10.1021\/es304385y","article-title":"Methylmercury is the predominant form of mercury in bird eggs: A synthesis","volume":"47","author":"Ackerman","year":"2013","journal-title":"Environ Sci Technol"},{"key":"2025010314530846900_etc4113-bib-0002","doi-asserted-by":"crossref","first-page":"1163","DOI":"10.1081\/ESE-120030301","article-title":"Spatial patterns of natural polycyclic aromatic hydrocarbons in sediment in the lower Athabasca River","volume":"39","author":"Akre","year":"2004","journal-title":"J Environ Sci Health A Tox Hazard Subst Environ Eng"},{"key":"2025010314530846900_etc4113-bib-0003","doi-asserted-by":"crossref","first-page":"123","DOI":"10.1139\/S07-038","article-title":"Process water treatment in Canada's oil sands industry: I. 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