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Titolo:
Total mercury in the water and sediments of St. Lawrence River wetlands compared with inland wetlands of Temagami North Bay and Muskoka-Haliburton
Autore:
Thompson-Roberts, ES; Pick, FR;
Indirizzi:
Univ Ottawa, Dept Biol, Ottawa Carleton Inst Biol, Ottawa, ON K1N 6N5, Canada Univ Ottawa Ottawa ON Canada K1N 6N5 nst Biol, Ottawa, ON K1N 6N5, Canada
Titolo Testata:
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
, volume: 57, anno: 2000, supplemento:, 1
pagine: 148 - 154
SICI:
0706-652X(2000)57:<148:TMITWA>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
PRECAMBRIAN SHIELD; LAKE-SEDIMENTS; METHYL MERCURY; ONTARIO LAKES; HEAVY-METALS; METHYLMERCURY; GEOCHEMISTRY; DEMETHYLATION; ACCUMULATION; ECOSYSTEMS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
45
Recensione:
Indirizzi per estratti:
Indirizzo: Thompson-Roberts, ES Environm Canada, Guidelines & Stand Div, 351 St Joseph Blvd,8th Floor, Ottawa, ON K1A 0H3, Canada Environm Canada 351 St Joseph Blvd,8th Floor Ottawa ON Canada K1A 0H3
Citazione:
E.S. Thompson-Roberts e F.R. Pick, "Total mercury in the water and sediments of St. Lawrence River wetlands compared with inland wetlands of Temagami North Bay and Muskoka-Haliburton", CAN J FISH, 57, 2000, pp. 148-154

Abstract

The concentration of total Hg was compared among 45 wetlands in three regions of Ontario. Twenty-two of these wetlands were located in the Muskoka-Haliburton Highlands and Temagami - North Bay regions and included bogs, fens, and marshes. Twenty-three were riverine marshes along the St. Lawrence River, near Cornwall, a Great Lakes area of concern, where Hg has been released through industrial activity. Overall, significant but weak negative relationships were found between pH and alkalinity of the surface waters and total water Hg concentrations (r(2) = 0.28-0.30, p < 0.001). A significant positive relationship was found between dissolved organic C and total water Hg (r(2) = 0.30). On average, St. Lawrence wetlands had lower total water Hgwhen compared with the inland wetlands, While a strong positive relationship was found between sediment organic matter and total sediment Hg concentrations (p < 0.001), the relationship was significantly different between the St. Lawrence and inland wetlands. In general, the St. Lawrence wetlands, despite the proximity to point sources of Hg, actually had lower sediment Hg, likely because of the lower organic matter. However, the St. Lawrence wetlands had twice the amount of Hg per unit of organic matter; the consequences of this difference for methyl mercury production and bioaccumulation need to be addressed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/11/20 alle ore 14:12:53