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Corpus Systématique Animale

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Heavy metal and selenium levels in birds at Agassiz National Wildlife Refuge, Minnesota: Food chain differences

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Oiseaux_v2b_00585, Poissons_v2b_000950
  • Joanna Burger 1,2,3,4
  • Michael Gochfeld 2,5
  • 1) Graduate Program in Ecology and Evolution, Rutgers University, 08855-1059, Piscataway, New Jersey, USA
  • 2) Environmental and Occupational Health Sciences Institute (EOHSI), 08855, Piscataway, New Jersey, USA
  • 3) Department of Biological Sciences, Rutgers University, 08855-1059, Piscataway, New Jersey, USA
  • 4) EOHSI, UMDNJ-Robert Wood Johnson Medical School, 08854, Piscataway, New Jersey, USA
  • 5) Environmental and Community Medicine, 08854, Piscataway, New Jersey, USA

The levels of heavy metals and selenium in the eggs and in breast feathers of adult doublecrested cormorant (Phalacrocorax auritus), black-crowned night heron (Nycticorax nycticorax), and franklin's gull (Larus pipixcan) nesting at Agassiz National Wildlife Refuge in Marshall County, northwestern Minnesota were examined. Also examined were metal levels in the feathers of fledgling night herons and gulls, in the feathers of adult and fledgling American bittern (Botaurus lentiginosus), in eggs of American coot (Fulica americana) and eared grebe (Podiceps caspicus), and in feathers of adult Canada geese (Branta canadensis). These species represent different levels on the food chain from primarily vegetation-eating species (geese, coot) to species that eat primarily fish (cormorant). A clear, positive relationship between level on the food chain and levels of heavy metals occurred only for mercury in feathers and eggs. Otherwise, eared grebes had the highest levels of all other metals in their eggs compared to the other species. No clear food chain pattern existed for feathers for the other metals. For eggs at Agassiz: 1) lead, selenium, and manganese levels were similar to those reported in the literature, 2) mercury levels were slightly higher for cormorants and night herons, 3) all species had higher chromium and cadmium levels than generally reported, and 4) eared grebes had significantly higher levels of cadmium than reported for any species from elsewhere. For adult feathers: 1) gulls had higher levels of lead than the other species, 2) cadmium levels were elevated in gulls and adult herons and cormorants, 3) mercury levels showed an increase with position on the food chain, 4) selenium and chromium levels of all birds at Agassiz were generally low and 5) manganese levels in adults were generally higher than in the literature for other species. Adults had significantly higher mercury levels than fledgling gulls, night herons, and bitterns.

Catégories Science-Metrix
  • 1 - natural sciences
  • 2 - earth & environmental sciences
  • 3 - environmental sciences
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
  • 4 - ethologie animale
Catégories Scopus
  • 1 - Physical Sciences ; 2 - Environmental Science ; 3 - Management, Monitoring, Policy and Law
  • 1 - Physical Sciences ; 2 - Environmental Science ; 3 - Pollution
  • 1 - Physical Sciences ; 2 - Environmental Science ; 3 - General Environmental Science
  • 1 - Health Sciences ; 2 - Medicine ; 3 - General Medicine
Catégories WoS
  • 1 - science ; 2 - environmental sciences
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Environmental Monitoring and Assessment

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  • Poissons
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