ArticleISME communications2026
Cross-habitat interactions drive methylmercury contamination in a disturbed river ecosystem: novel metagenomic and biogeochemical insights.
Article in ISME communications, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Understanding contaminant dynamics in ecosystems requires considering interactions between habitats-an aspect often overlooked in research. Mercury (Hg) studies typically focus on methylmercury (MeHg) production in sediments, often neglecting the role of biofilms such as periphyton. This study analyzes sediments and periphyton in a disturbed river using biogeochemical and metagenomic approaches. We found that microbial communities differed between habitats, but Hg-methylating microbes were taxonomically similar, with higher abundance in sediments. Organic matter (OM), a key Hg vector, likely affects Hg dynamics differently across habitats: MeHg concentrations increased with increasing terrigenous OM in sediments, whereas in periphyton, MeHg increased with greater contributions of aquatic-derived OM. Surprisingly, periphyton showed higher MeHg concentrations than sediments, despite lower
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