ArticleApplied and environmental microbiology2026
Marine antifouling biocide 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one disrupts sediment microbiome structure and function: insights from absolute quantification and enzyme activity dynamics.
Article in Applied and environmental microbiology, 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
The organic booster biocide DCOIT (4,5-dichloro-2-n-octyl-4-isothiazolin-3-one) is widely used in marine antifouling systems, yet its ecological impacts on sediment microbiomes remain poorly understood. Here, we integrated absolute quantitative 16S rRNA gene sequencing, metagenomics, and enzyme activity assays to examine microbial responses to DCOIT exposure (0-50 μg/g sediment) over 30 days. DCOIT induced oxidative stress and bioenergetic impairment, accompanied by reduced microbial activity and inhibition of key enzyme-mediated processes involved in organic matter turnover and nitrogen transformation. Absolute quantification revealed a compensatory increase in total microbial abundance by Day 30, despite persistent diversity loss and community restructuring. Metagenomic analysis showed that DCOIT disturbed functional potentials related to carbon and nitrogen cycling.
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