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Titolo:
CYTOCHROME-P450 AND ORGANOCHLORINE CONTAMINANTS IN BLACK-CROWNED NIGHT-HERONS FROM THE CHESAPEAKE BAY-REGION, USA
Autore:
RATTNER BA; MELANCON MJ; RICE CP; RILEY W; EISEMANN J; HINES RK;
Indirizzi:
US DEPT INTERIOR,PATUXENT WILDLIFE RES CTR,12011 BEECH FOREST RD LAUREL MD 20708
Titolo Testata:
Environmental toxicology and chemistry
fascicolo: 11, volume: 16, anno: 1997,
pagine: 2315 - 2322
SICI:
0730-7268(1997)16:11<2315:CAOCIB>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
SAN-FRANCISCO BAY; POLYCHLORINATED-BIPHENYLS; EXPOSURE; EMBRYOS; WATERBIRDS; PCBS; EGGS; DDE;
Keywords:
BIOMONITORING; BIOMARKERS; POLYCHLORINATED BIPHENYL CONGENERS; TOXIC EQUIVALENTS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
36
Recensione:
Indirizzi per estratti:
Citazione:
B.A. Rattner et al., "CYTOCHROME-P450 AND ORGANOCHLORINE CONTAMINANTS IN BLACK-CROWNED NIGHT-HERONS FROM THE CHESAPEAKE BAY-REGION, USA", Environmental toxicology and chemistry, 16(11), 1997, pp. 2315-2322

Abstract

Black-crowned night-heron (Nycticorax nycticorax) offspring were collected from a relatively uncontaminated coastal reference site (next toChincoteague National Wildlife Refuge, VA, USA) and two sites in the Chesapeake Bay watershed (Baltimore Harbor, MD and Rock Creek Park, Washington, DC, USA). Hepatic microsomal activities of benzyloxyresorufin-O-dealkylase and ethoxyresorufin-O-dealkylase were significantly elevated (up to sixfold and ninefold induction, respectively) in pipping embryos from the Baltimore Harbor colony compared to the reference site, whereas values in embryos from the Rock Creek Park colony were intermediate. Concentrations of organochlorine pesticides and metabolites in pipping embryos from both sites in the Chesapeake watershed were greater than at the reference site but below the known threshold for reproductive impairment. However, concentrations of 10 arylhydrocarbon receptor-active polychlorinated biphenyl (PCB) congeners and estimated toxic equivalents were up to 37-fold greater in embryos collected from these two sites in the Chesapeake Bay region, with values for toxic congeners 77 and 126 exceeding those observed in pipping heron embryos from the Great Lakes. Monooxygenase activity of pipping embryos was associated with concentrations of several organochlorine pesticides, total PCBs, arylhydrocarbon receptor-active PCB congeners, and toxic equivalents (r = 0.30-0.59), providing further evidence of the value of cytochrome P450 as a biomarker of organic contaminant exposure. Organochlorine contaminant levels were greater in 10-d-old nestlings from Baltimore Harbor than the reference site but had no apparent effect on monooxygenase activity or growth. These findings demonstrate induction of cytochrome P450 in pipping black-crowned night-heron embryos in the Chesapeake Bay region, probably by exposure to PCB congeners of local origin, and the accumulation of organochlorine pesticides and metabolites in nestling herons from Baltimore Harbor. Biomonitoring with additional waterbird species (e.g., bald eagle, common tern, great blue heron) that appear to be more sensitive to PCBs than black-crowned night-herons is recommended to document health of waterbirds and remediation of the Chesapeake Bay.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/09/20 alle ore 11:16:36