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High concentrations of lead (Pb) in blood and milk of free-ranging brown bears (Ursus arctos) in Scandinavia
Department of Forestry and Wildlife Management, Inland Norway University of Applied Sciences, Campus Evenstad, 2418, Elverum, Norway.
Department of Forestry and Wildlife Management, Inland Norway University of Applied Sciences, Campus Evenstad, 2418, Elverum, Norway.
Department of Natural Science and Environmental Health, University of South-Eastern Norway, 3800, Bø in Telemark, Norway; Institute for Wildlife Biology and Game Management, University of Natural Resources and Life Sciences, 1180, Vienna, Austria.
Département de biologie, Université de Sherbrooke, Sherbrooke, J1K 2R1, Québec, Canada.
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2021 (English)In: Environmental Pollution, ISSN 0269-7491, E-ISSN 1873-6424, Vol. 287, article id 117595Article in journal (Refereed) Published
Abstract [en]

Exposure to lead (Pb) is a global health problem for both humans and wildlife. Despite a dramatic decline in human Pb exposure following restrictions of leaded gasoline and industry and thereby an overall reduction of Pb entering the environment, Pb exposure continues to be a problem for wildlife species. Literature on scavenging terrestrial mammals, including interactions between Pb exposure and life history, is however limited.

We quantified Pb concentration in 153 blood samples from 110 free-ranging Scandinavian brown bears (Ursus arctos), 1–25 years old, using inductively coupled plasma sector field mass spectrometry. We used generalized linear models to test effects of age, body mass, reproduction status and spatial distribution on the blood Pb concentrations of 56 female bears. We sampled 28 females together with 56 dependent cubs and paired their blood Pb concentrations. From 20 lactating females, we measured the Pb concentration in milk.

The mean blood Pb concentration was 96.6 μg/L (range: 38.7.0–220.5 μg/L). Both the mean and range are well above established threshold concentrations for developmental neurotoxicity (12 μg/L), increased systolic blood pressure (36 μg/L) and prevalence of kidney disease in humans (15 μg/L). Lactating females had higher Pb blood concentrations compared to younger, non-lactating females. Blood Pb concentrations of dependent cubs were correlated with their mother's blood Pb concentration, which in turn was correlated with the Pb concentration in the milk.

Life-long Pb exposure in Scandinavian brown bears may have adverse effects both on individual and population levels. The high blood Pb concentrations found in brown bears contrast the general reduction in environmental Pb contamination over the past decades in Scandinavia and more research is needed to identify the sources and pathways of Pb exposure in the brown bears.

Place, publisher, year, edition, pages
Elsevier, 2021. Vol. 287, article id 117595
Keywords [en]
Lead, Blood, Milk, Ursus arctos, Carnivora
National Category
Ecology
Research subject
Applied Geochemistry
Identifiers
URN: urn:nbn:se:ltu:diva-85559DOI: 10.1016/j.envpol.2021.117595ISI: 000696625400006PubMedID: 34426381Scopus ID: 2-s2.0-85109168542OAI: oai:DiVA.org:ltu-85559DiVA, id: diva2:1568232
Funder
The Research Council of NorwaySwedish Environmental Protection Agency
Note

Validerad;2021;Nivå 2;2021-07-14 (johcin);

Finansiär: Norwegian Environment Agency (19047048); Inland Norway University of Applied Sciences 

Available from: 2021-06-17 Created: 2021-06-17 Last updated: 2021-09-24Bibliographically approved

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Rodushkin, Ilia

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