WHAT THE EVIDENCE SAYS
Researchers measured total mercury in surface soils, plant litter and litter-associated invertebrates in a protected Cerrado landscape. Mean measured concentrations differed across compartments, including approximately 51.7 ng/g in litter versus 34.9 ng/g in soil; higher invertebrate trophic groups tended to carry elevated concentrations in the samples.
WHY IT MATTERS / OUR READ
Monitoring only water or bulk soil may miss exposure pathways through the litter layer and its consumers. Biodiversity surveys and contamination screening should be designed around the actual food web and which mercury species organisms accumulate.
CAVEATS / UNCERTAINTY
Site-specific cross-sectional measurements cannot demonstrate population effects, contamination sources or an exposure threshold. Total mercury is not synonymous with methylmercury, and apparent trophic enrichment does not by itself prove biomagnification.
SOURCE
Environmental Monitoring and Assessment · Cerrado mercury food-web study
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