Stable Mercury Trends Support a Long-Term Diet Shift Away from Marine Foraging in Salish Sea Glaucous-Winged Gulls over the Last Century

Emily S.Choy; Louise K Blight; John E.Elliott

首页> 外文期刊>Environmental Science & Technology: ES&T >Stable Mercury Trends Support a Long-Term Diet Shift Away from Marine Foraging in Salish Sea Glaucous-Winged Gulls over the Last Century

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Stable Mercury Trends Support a Long-Term Diet Shift Away from Marine Foraging in Salish Sea Glaucous-Winged Gulls over the Last Century

机译：Stable Mercury Trends Support a Long-Term Diet Shift Away from Marine Foraging in Salish Sea Glaucous-Winged Gulls over the Last Century

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Marine predators are monitored as indicators of pollution,but such trends can be complicated by variation in diet.Glaucous-winged gulls(Larus glaucescens) have experienced a dietary shift over the past century,from mainly marine to including more terrestrial/freshwater inputs,with unknown impacts on mercury(Hg) trends.We examined 109-year trends in total mercury(THg) and methylmercury(MeHg) concentrations in glaucous-winged gull feathers(1887-1996) from the Salish Sea.Adult flank feathers had higher MeHg concentrations than immature feathers,and males head feathers had higher THg concentrations than females.Overall,we found no evidence of a trend in feather MeHg or THg concentrations over time from 1887 to 1996.In the same individuals,δ~(15)N,δ~(13)C,and δ~(34)S declined over time in gull feathers.In comparison,egg THg concentrations declined from 1970 to 2019 in two species of cormorants,likely reflecting decreases in local Hg sources.We conclude that diet shifts through time may have countered increased Hg deposition from long-range transport in glaucous-winged gulls.The lack of Hg trends over time in glaucous-winged gull feathers provides additional support that these gulls have decreased the amount of marine forage fish in their diet.

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《Environmental Science & Technology: ES&T》 |2022年第17期|12097-12105|共9页
作者
Emily S.Choy; Louise K Blight; John E.Elliott;
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作者单位

Department of Natural Resource Sciences,McGill University,Ste.Anne de Bellevue,Quebec H9X 3V9,Canada;

School of Environmental Studies,University of Victoria,Victoria,British Columbia V8P SC2,Canada;

Environment and Climate Change Canada,Pacific Wildlife Research Centre,Delta,British Columbia V4K 3N2,Canada;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类环境科学、安全科学;
关键词
mercury; seabirds; stable isotopes; glaucous-winged gulls; cormorants; North Pacific; food webs;

Stable Mercury Trends Support a Long-Term Diet Shift Away from Marine Foraging in Salish Sea Glaucous-Winged Gulls over the Last Century

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