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Titolo:
ENVIRONMENTAL-FACTORS AFFECTING METHYL MERCURY ACCUMULATION IN ZOOPLANKTON
Autore:
WESTCOTT K; KALFF J;
Indirizzi:
UNIV ALBERTA,G-208 BIOL SCI BLDG EDMONTON AB T6G 2E9 CANADA MCGILL UNIV,DEPT BIOL MONTREAL PQ H3A 1B1 CANADA
Titolo Testata:
Canadian journal of fisheries and aquatic sciences
fascicolo: 10, volume: 53, anno: 1996,
pagine: 2221 - 2228
SICI:
0706-652X(1996)53:10<2221:EAMMAI>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
BASS MICROPTERUS-DOLOMIEUI; PRECAMBRIAN SHIELD LAKES; DISSOLVED ORGANIC-CARBON; NORTHERN WISCONSIN LAKES; SWEDISH FOREST LAKES; ONTARIO LAKES; WATER-QUALITY; HUMIC SUBSTANCES; SALMO-GAIRDNERI; SURFACE WATERS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
67
Recensione:
Indirizzi per estratti:
Citazione:
K. Westcott e J. Kalff, "ENVIRONMENTAL-FACTORS AFFECTING METHYL MERCURY ACCUMULATION IN ZOOPLANKTON", Canadian journal of fisheries and aquatic sciences, 53(10), 1996, pp. 2221-2228

Abstract

Filter-feeding macrozooplankton were collected from 24 lakes in south-central Ontario to examine relationships between environmental factors and methyl mercury accumulation. Zooplankton methyl mercury levels ranged from 19 to 448 ng . g dry mass(-1) in the study lakes and were highest in zooplankton from acidic brown-water lakes. Water color and pH together were the best predictors of methyl mercury levels in zooplankton, explaining 73% of the variation. Methyl mercury concentrations were positively correlated with water color and inversely correlated with lake water pH. Zooplankton methyl mercury levels were positively linked to both the drainage ratio and the percent wetland in the catchment, suggesting that the supply of mercury from the drainage basin plays an important role-in determining methyl mercury concentrations in lacustrine biota. Our results provide the first demonstration that in drainage lakes the effects of water color outweigh those of pH in influencing methyl mercury levels in the biota at or near the base of the food chain. Zooplankton methyl mercury levels were well correlated withmercury concentrations in smallmouth bass (Micropterus dolomieui) andlargemouth bass (Micropterus salmoides) from 11 of the study lakes, showing zooplankton to be good indicators of the relative bioavailability of mercury at the base of the food chain.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 09:58:39