Pronounced declines in heavy metal burdens of Minnesotan mammals over the last century.
Bioaccumulation
Ecotoxicology
Heavy metals
Minnesota
Pb
Rodents
Journal
Environmental science and pollution research international
ISSN: 1614-7499
Titre abrégé: Environ Sci Pollut Res Int
Pays: Germany
ID NLM: 9441769
Informations de publication
Date de publication:
16 Aug 2024
16 Aug 2024
Historique:
received:
21
02
2024
accepted:
05
08
2024
medline:
16
8
2024
pubmed:
16
8
2024
entrez:
16
8
2024
Statut:
aheadofprint
Résumé
Humans have drastically altered the ecology of heavy metals, which can have negative effects on animal development and neural functioning. Many species have shown the ability to adapt to anthropogenic increases in metal pollution, but such evolutionary responses will depend on the extent of metal variation over space and time. For terrestrial vertebrates, it is unclear how metal exposure has changed over time: some studies suggest metal content peaked with the enactment of policies controlling lead emissions, while other studies suggest metal levels peaked at least a century earlier. We used 162 specimens of four mammal species (a mouse, shrew, bat, and squirrel) to ask how metal content of the fur and skin has changed over a 90-year time period, and impacts on individual performance (body size and cranial capacity). Using ICP-MS, we show that for lead, cadmium, copper, and chromium, there were significant declines in metal content in mammal tissue over the 90-year time period, with lead levels five times lower now than in the early 1900s. Importantly, metal content began to drop well before the pollution regulation of the 1970s. Effects of time greatly outweighed any effects of an individual living near a human population center. Surprisingly, there were no effects of body metal content on body size, and only manganese was negatively related to relative cranial capacity. Taken together, these results suggest that present day populations of mammals are experiencing levels of heavy metal exposure that are less stressful than they were 100 years ago. In addition, temporal decreases in metal loads likely partly reflect global patterns of pollution decline that affect atmospheric metal deposition rather than local point sources of exposure.
Identifiants
pubmed: 39150665
doi: 10.1007/s11356-024-34667-y
pii: 10.1007/s11356-024-34667-y
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Subventions
Organisme : National Science Foundation
ID : DEB-2045382
Organisme : Minnesota Environment and Natural Resources Trust Fund
ID : ML2022 CH 94 ART SEC 2 SUB 08E APPR 2022
Informations de copyright
© 2024. The Author(s).
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