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using nestling plasma to assess long-term spatial and temporal concentrations of organochlorine compounds in bald eagles within voyageurs national park, minnesota, usa.the bald eagle (haliaeetus leucocephalus) population at voyageurs national park (vnp) provides an opportunity to assess long-term temporal and spatial trends of persistent environmental contaminants. nestling bald eagle plasma samples collected from 1997 to 2010 were analyzed for polychlorinated biphenyls (pcbs) and organochlorine pesticides. trends of total pcbs, total ddts, 4,4'-dde, and dieldrin were analyzed since >50% of nestling plasma samples had detectable concentrations. total pcbs, tot ...201525563158
multiple metals exposure and neurotoxic risk in bald eagles (haliaeetus leucocephalus) from two great lakes states.in the present study, the authors determined concentrations of several elements (as, cd, co, cu, cr, mn, pb, sb, zn) in the brains and livers of 46 bald eagles (haliaeetus leucocephalus) from two great lakes states, michigan and minnesota. to explore whether exposures are of neurological concern, the authors assessed their associations with neurochemical receptors (n-methyl-d-aspartate [nmda] and γ-aminobutyric acid a [gaba(a)]) and enzymes (glutamine synthetase [gs] and glutamic acid decarboxyl ...201222170515
using nestling feathers to assess spatial and temporal concentrations of mercury in bald eagles at voyageurs national park, minnesota, usa.bald eagles (haliaeetus leucocephalus) have been utilized as a biosentinel of aquatic ecosystem health in the great lakes region since the early 1960s. bald eagle populations have been monitored at voyageurs national park (vnp), minnesota, since 1973. for the past 20 years, researchers have collected feathers from nestling bald eagles to assess their dietary exposure to mercury (hg) on rainy, kabetogama, and namakan lakes in vnp. mercury is an environmental pollutant with both natural and anthro ...201121779822
mercury exposure and neurochemical impacts in bald eagles across several great lakes states.in this study, we assessed mercury (hg) exposure in several tissues (brain, liver, and breast and primary feathers) in bald eagles (haliaeetus leucocephalus) collected from across five great lakes states (iowa, michigan, minnesota, ohio, and wisconsin) between 2002-2010, and assessed relationships between brain hg and neurochemical receptors (nmda and gaba(a)) and enzymes (glutamine synthetase (gs) and glutamic acid decarboxylase (gad)). brain total hg (thg) levels (dry weight basis) averaged 2. ...201121735125
leucocytozoonosis in nestling bald eagles in michigan and minnesota.thirteen of 21 nestling bald eagles (haliaeetus leucocephalus) examined for blood parasites in michigan and minnesota (usa) during june and july 1997 had patent infections of leucocytozoon toddi. no other parasites were seen. the degree of parasitemia was light and varied from 1 to 2 on the ashford scale. several of the infected nestlings appeared to have elevated levels of heterophils in their peripheral circulating blood. one of the infected nestlings also showed signs of severe anemia. we bel ...199910479102
isolation and molecular characterization of newcastle disease viruses from raptors.the present study was undertaken to detect and characterize newcastle disease virus (ndv) in raptors. cloacal and oropharyngeal swab samples were collected from 60 casualty raptors during january to march 2009 in minnesota. inoculation of all these samples (n=120) in 9-day-old embryonated hens' eggs resulted in isolation of haemagglutinating viruses in three samples from two bald eagles and one great horned owl. these three haemagglutinating viruses were confirmed as ndv by reverse transcription ...201021154052
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