This study was conducted on the continental shelf surrounding a large metropolitan region on the coast of Sao Paulo State, Southeast Brazil. This region harbours a large industrial plant and the largest port in Latin America, both of which release pollutants into the Santos-Sao Vicente estuarine system. High levels of Hg have been reported in sediments and fish from the estuaries and Santos Bay; however, data for the biota in offshore waters are scarce, and the biomagnification of Hg across the food web here has never been assessed. In this study, the trophic structure of the Santos shelf was addressed through the carbon and nitrogen stable isotope compositions of different species across a trophic gradient. We determined the total Hg levels (THg, dry weight) of invertebrates and fish to estimate the rate of biomagnification of this metal in the benthic and pelagic food webs. The lowest mean THg levels were found in zooplankton (0.006 mu g g(-1)) and surface-depositivore polychaetes (0.011 mu g g(-1)); the highest THg levels were found in the largest fishes: Patagonian flounder (0.825 mu g g(-1)), fat snook (0.714 mu g g(-1)), and lesser guitarfish (0.639 mu g g(-1)). Overall, the Hg concentration in fish was below the recommended limit for human consumption. The THg and delta N-15 were positively correlated in both food webs; however, the rate of biomagnification was higher and the basal Hg was lower in the pelagic food web. These differences may be related to the differing bioavailability of mercury in water and sediment, the higher diversity of prey and more complex feeding interactions in the benthic food web, and metabolic differences among different taxa.
机构:
Inst Politecn Nacl, Ctr Interdisciplinario Ciencias Marinas, Av IPN S-N,Colonia Playa Palo de Santa Rita, La Paz 23000, Bcs, MexicoInst Politecn Nacl, Ctr Interdisciplinario Ciencias Marinas, Av IPN S-N,Colonia Playa Palo de Santa Rita, La Paz 23000, Bcs, Mexico
Murillo-Cisneros, Daniela A.
O'Hara, Todd M.
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Univ Alaska Fairbanks, Dept Vet Med, 901 Koyukuk Dr, Fairbanks, AK 99775 USAInst Politecn Nacl, Ctr Interdisciplinario Ciencias Marinas, Av IPN S-N,Colonia Playa Palo de Santa Rita, La Paz 23000, Bcs, Mexico
O'Hara, Todd M.
Elorriaga-Verplancken, Fernando R.
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Inst Politecn Nacl, Ctr Interdisciplinario Ciencias Marinas, Av IPN S-N,Colonia Playa Palo de Santa Rita, La Paz 23000, Bcs, MexicoInst Politecn Nacl, Ctr Interdisciplinario Ciencias Marinas, Av IPN S-N,Colonia Playa Palo de Santa Rita, La Paz 23000, Bcs, Mexico
Elorriaga-Verplancken, Fernando R.
Sanchez-Gonzalez, Alberto
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Inst Politecn Nacl, Ctr Interdisciplinario Ciencias Marinas, Av IPN S-N,Colonia Playa Palo de Santa Rita, La Paz 23000, Bcs, MexicoInst Politecn Nacl, Ctr Interdisciplinario Ciencias Marinas, Av IPN S-N,Colonia Playa Palo de Santa Rita, La Paz 23000, Bcs, Mexico
Sanchez-Gonzalez, Alberto
Marin-Enriquez, Emigdio
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Ctr Invest Biol Noroeste, SC Av IPN S-N, La Paz 23096, Bcs, MexicoInst Politecn Nacl, Ctr Interdisciplinario Ciencias Marinas, Av IPN S-N,Colonia Playa Palo de Santa Rita, La Paz 23000, Bcs, Mexico
Marin-Enriquez, Emigdio
Marmolejo-Rodriguez, Ana J.
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Inst Politecn Nacl, Ctr Interdisciplinario Ciencias Marinas, Av IPN S-N,Colonia Playa Palo de Santa Rita, La Paz 23000, Bcs, MexicoInst Politecn Nacl, Ctr Interdisciplinario Ciencias Marinas, Av IPN S-N,Colonia Playa Palo de Santa Rita, La Paz 23000, Bcs, Mexico
Marmolejo-Rodriguez, Ana J.
Galvan-Magana, Felipe
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Inst Politecn Nacl, Ctr Interdisciplinario Ciencias Marinas, Av IPN S-N,Colonia Playa Palo de Santa Rita, La Paz 23000, Bcs, MexicoInst Politecn Nacl, Ctr Interdisciplinario Ciencias Marinas, Av IPN S-N,Colonia Playa Palo de Santa Rita, La Paz 23000, Bcs, Mexico
机构:
Univ New Brunswick, Canadian Rivers Inst, St John, NB E2L 4L5, Canada
Univ New Brunswick, Dept Biol, St John, NB E2L 4L5, CanadaUniv New Brunswick, Canadian Rivers Inst, St John, NB E2L 4L5, Canada
Clayden, Meredith G.
Kidd, Karen A.
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Univ New Brunswick, Canadian Rivers Inst, St John, NB E2L 4L5, Canada
Univ New Brunswick, Dept Biol, St John, NB E2L 4L5, CanadaUniv New Brunswick, Canadian Rivers Inst, St John, NB E2L 4L5, Canada
Kidd, Karen A.
Wyn, Brianna
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North South Consultants Inc, Winnipeg, MB R3Y 1G4, CanadaUniv New Brunswick, Canadian Rivers Inst, St John, NB E2L 4L5, Canada
Wyn, Brianna
Kirk, Jane L.
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机构:
Environm Canada, Aquat Ecosyst Protect Res Div, Burlington, ON L7R 4A6, CanadaUniv New Brunswick, Canadian Rivers Inst, St John, NB E2L 4L5, Canada
Kirk, Jane L.
Muir, Derek C. G.
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Environm Canada, Aquat Ecosyst Protect Res Div, Burlington, ON L7R 4A6, CanadaUniv New Brunswick, Canadian Rivers Inst, St John, NB E2L 4L5, Canada
Muir, Derek C. G.
O'Driscoll, Nelson J.
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机构:
Acadia Univ, Dept Earth & Environm Sci, Wolfville, NS B4P 2R6, CanadaUniv New Brunswick, Canadian Rivers Inst, St John, NB E2L 4L5, Canada
机构:
Chinese Acad Sci, State Key Lab Environm Geochem, Inst Geochem, Guiyang 550081, Peoples R ChinaChinese Acad Sci, State Key Lab Environm Geochem, Inst Geochem, Guiyang 550081, Peoples R China
Xu, Zhidong
Lu, Qinhui
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机构:
Guizhou Med Univ, Guizhou Prov Engn Res Ctr Ecol Food Innovat, Key Lab Environm Pollut Monitoring & Dis Control, Sch Publ Hlth,Minist Educ, Guiyang 550025, Peoples R ChinaChinese Acad Sci, State Key Lab Environm Geochem, Inst Geochem, Guiyang 550081, Peoples R China
Lu, Qinhui
Jia, Dongya
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h-index: 0
机构:
Guizhou Normal Univ, Sch Chem & Mat Sci, Guiyang 550001, Peoples R ChinaChinese Acad Sci, State Key Lab Environm Geochem, Inst Geochem, Guiyang 550081, Peoples R China
Jia, Dongya
Li, Shenghao
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h-index: 0
机构:
Guizhou Normal Univ, Sch Chem & Mat Sci, Guiyang 550001, Peoples R ChinaChinese Acad Sci, State Key Lab Environm Geochem, Inst Geochem, Guiyang 550081, Peoples R China
Li, Shenghao
Luo, Kang
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机构:
Chinese Acad Sci, State Key Lab Environm Geochem, Inst Geochem, Guiyang 550081, Peoples R China
Chinese Acad Sci, Ailaoshan Stn Subtrop Forest Ecosyst Studies, Jingdong 676200, Peoples R ChinaChinese Acad Sci, State Key Lab Environm Geochem, Inst Geochem, Guiyang 550081, Peoples R China
Luo, Kang
Su, Tongping
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机构:
Nanning Normal Univ, Key Lab Environm Change & Resources Use Beibu Gulf, Minist Educ, Nanning 530001, Peoples R ChinaChinese Acad Sci, State Key Lab Environm Geochem, Inst Geochem, Guiyang 550081, Peoples R China
Su, Tongping
Chen, Zhuo
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机构:
Guizhou Normal Univ, Sch Chem & Mat Sci, Guiyang 550001, Peoples R ChinaChinese Acad Sci, State Key Lab Environm Geochem, Inst Geochem, Guiyang 550081, Peoples R China
Chen, Zhuo
Qiu, Guangle
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机构:
Chinese Acad Sci, State Key Lab Environm Geochem, Inst Geochem, Guiyang 550081, Peoples R ChinaChinese Acad Sci, State Key Lab Environm Geochem, Inst Geochem, Guiyang 550081, Peoples R China