Year-to-year correlations in blood metal levels among individuals of two species of North American sea ducks
Autor: | C. Swoboda, Katherine R. Mehl, Ray T. Alisauskas, Mark Wayland, Joshua J. Traylor, E. Neugebauer, Dana K. Kellett |
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Rok vydání: | 2007 |
Předmět: |
Pollution
Health Toxicology and Mutagenesis media_common.quotation_subject chemistry.chemical_element Zoology Fresh Water Toxicology Time Melanitta fusca Selenium Species Specificity Metals Heavy Animals media_common Cadmium biology Ecology Environmental Exposure Mercury General Medicine Environmental exposure biology.organism_classification Anatidae Mercury (element) Ducks Lead chemistry North America Information gap Environmental Pollutants |
Zdroj: | Environmental Pollution. 150:329-337 |
ISSN: | 0269-7491 |
Popis: | Sea duck populations have declined in North America. Contaminants, especially metals, have been listed as possible contributing factors. Sea ducks are long-lived. Thus, individuals chronically exposed to elevated metal levels may be at greatest risk. Information about long-term exposure (> or =1year) of individuals to metals is absent. To address this information gap, we examined year-to-year correlations among individual White-Winged Scoters and King Eiders in levels of blood cadmium, lead, mercury and selenium. Positive correlations (r> or =0.43), were found in six, five, five and two of seven correlations for cadmium, selenium, lead and mercury. Thus, certain individuals of these species may be exposed over two or more years to higher levels of cadmium, selenium and lead (but apparently not mercury) than other individuals. Single blood samples are appropriate metrics of exposure for studies that examine long-term effects of certain metals on these birds. |
Databáze: | OpenAIRE |
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