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Titolo:
POTENTIAL RISK TO COMMON LOONS (GAVIA-IMMER) FROM METHYLMERCURY EXPOSURE IN ACIDIFIED LAKES
Autore:
SCHEUHAMMER AM; BLANCHER PJ;
Indirizzi:
ENVIRONM CANADA,CANADIAN WILDLIFE SERV,NATL WILDLIFE RES CTR,100 GAMELIN BLVD HULL K1A 0H3 PQ CANADA
Titolo Testata:
Hydrobiologia
, volume: 280, anno: 1994,
pagine: 445 - 455
SICI:
0018-8158(1994)280:<445:PRTCL(>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
PRECAMBRIAN SHIELD LAKES; MERCURY CONCENTRATIONS; EASTERN CANADA; ENVIRONMENTAL-FACTORS; METHYL MERCURY; ONTARIO LAKES; INLAND LAKES; FISH; WATER; ACIDIFICATION;
Keywords:
LOONS; MERCURY; FISH; ACIDIFICATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
36
Recensione:
Indirizzi per estratti:
Citazione:
A.M. Scheuhammer e P.J. Blancher, "POTENTIAL RISK TO COMMON LOONS (GAVIA-IMMER) FROM METHYLMERCURY EXPOSURE IN ACIDIFIED LAKES", Hydrobiologia, 280, 1994, pp. 445-455

Abstract

Piscivorous birds and mammals in areas remote from point sources of Hg contamination may be exposed to dietary methylmercury concentrationsthat are sufficiently high to cause reproductive impairment. Common loons (Gavia immer) were observed to show aberrant nesting behavior andlow overall reproductive success when Hg concentrations in prey (small fish and crayfish) averaged > 0.3 mug g-1 wet weight (Barr, 1986), levels known to occur in fish from many lakes in central Ontario. We used data on Hg in Ontario fish to estimate the proportion of lakes where fish small enough for loons to eat (< 250 g) had Hg concentrations that exceeded estimated thresholds for reproductive impairment. Up to 30% of lakes exceeded thresholds for reproductive impairment, dependingon the species of fish and the threshold Hg concentrations chosen. There was a significant negative correlation between fish-Hg concentration and lake pH in most fish species examined. For these species, reductions in sulfate deposition rates are predicted to result in a corresponding reduction of lakes in Ontario having fish with potentially toxic concentrations of Hg.

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Documento generato il 24/11/20 alle ore 14:39:47