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High concentrations of lead (Pb) in blood and milk of free-ranging brown bears (Ursus arctos) in Scandinavia

Fuchs, Boris and Thiel, Alexandra and Zedrosser, Andreas and Brown, Ludovick and Hydeskov, Helle B. and Rodushkin, Ilia and Evans, Alina L. and Boesen, Amanda H. and Graesli, Anne Randi and Kindberg, Jonas and Arnemo, Jon M. (2021). High concentrations of lead (Pb) in blood and milk of free-ranging brown bears (Ursus arctos) in Scandinavia. Environmental Pollution. 287 , 117595
[Research article]

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Abstract

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 mu g/L (range: 38.7-220.5 mu g/L). Both the mean and range are well above established threshold concentrations for developmental neurotoxicity (12 mu g/L), increased systolic blood pressure (36 mu g/L) and prevalence of kidney disease in humans (15 mu g/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.

Authors/Creators:Fuchs, Boris and Thiel, Alexandra and Zedrosser, Andreas and Brown, Ludovick and Hydeskov, Helle B. and Rodushkin, Ilia and Evans, Alina L. and Boesen, Amanda H. and Graesli, Anne Randi and Kindberg, Jonas and Arnemo, Jon M.
Title:High concentrations of lead (Pb) in blood and milk of free-ranging brown bears (Ursus arctos) in Scandinavia
Series Name/Journal:Environmental Pollution
Year of publishing :2021
Volume:287
Article number:117595
Number of Pages:9
Publisher:ELSEVIER SCI LTD
ISSN:0269-7491
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Environmental Sciences (social aspects to be 507)
Keywords:Lead, Blood, Milk, Ursus arctos, Carnivora
URN:NBN:urn:nbn:se:slu:epsilon-p-113755
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-113755
Additional ID:
Type of IDID
DOI10.1016/j.envpol.2021.117595
Web of Science (WoS)000696625400006
ID Code:25566
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Wildlife, Fish and Environmental Studies
Deposited By: SLUpub Connector
Deposited On:06 Oct 2021 13:25
Metadata Last Modified:06 Oct 2021 13:31

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