Understanding Food Web Mercury Accumulation Through Trophic Transfer and Carbon Processing along a River Affected by Recent Run-of-river Dams
نویسندگان
چکیده
Unlike large dams which favor methylation of Hg in flooded soils over long periods, run-of-river are designed to flood a limited area and therefore not expected significantly affect mercury (Hg) cycling or carbon processing. We studied the cycles within food webs from several sectors along Saint-Maurice River, Quebec, Canada, that differ how they influenced by two other watershed disturbances. observed peak concentrations fish five-year postimpoundment, but these levels were reduced three years after this peak. Methylmercury low trophic level invertebrates related their source (δ13C) rather than positions (δ15N). Biomagnification, measured magnification slopes, was driven mainly methylmercury low-trophic organisms environmental factors organic matter degradation Hg-methylation. River sectors, δ13C δ15N, predicted up 80% variability web concentrations. The installation pondages, association with disturbances, altered processing, promoted Hg-methylation its accumulation at base web, led temporary increase fish.
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ژورنال
عنوان ژورنال: Environmental Science & Technology
سال: 2021
ISSN: ['1520-5851', '0013-936X']
DOI: https://doi.org/10.1021/acs.est.0c07015