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Dharampal, Prarthana S.; Findlay, Robert H.
Chemosphere (Oxford), March 2017, 2017-Mar, 2017-03-00, 20170301, Letnik: 170Journal Article
Within areas of comparable atmospheric mercury deposition rates methylmercury burden in largemouth bass populations vary significantly between regulated and unregulated rivers. To investigate if trophic dynamics strongly influenced pollutant body load, we sampled largemouth bass from two adjacent rivers, one regulated and one unregulated, and applied a suite of biochemical and stable isotope assays to compare their trophic dynamics. Total mercury burden in the bass from the unregulated Sipsey River (Elrod, AL, USA) and the regulated Black Warrior River (Demopolis, AL, USA) averaged 0.87 mg kg−1 and 0.19 mg kg−1 wet weight, respectively. For both populations, age, weight, and length were positively correlated with muscle mercury concentration. Compound specific stable isotope analysis of amino acids showed the trophic position of both populations was just under four. Quantitative and isotopic analysis of neutral lipid fatty acid of Sipsey River bass indicated a greater reliance upon the detrital component of the food web compared to Demopolis Reservoir bass which fed within the autochthonous, pelagic component of the food web. Since the close proximity of the rivers makes differences in atmospheric deposition unlikely and both populations had similar trophic position, our findings indicate that food web dynamics should be included among the factors that can strongly influence mercury concentration in fish. Display omitted •Bass from an unregulated river showed higher mercury than bass from a regulated river.•Compound specific isotope analysis determined bass feed at similar trophic positions.•Compound specific isotope analysis showed different food web structure in the rivers.•Benthic-pelagic coupling was determined to be the proximate cause of higher mercury.
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