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Heavy metal accumulation and limited trophic transfer in the Xiangjiang River food web.

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Τίτλος: Heavy metal accumulation and limited trophic transfer in the Xiangjiang River food web.
Συγγραφείς: Yang T; College of Fisheries, Hunan Agricultural University, Changsha, 410128, PR China; Hunan Engineering Research Center for Utilization of Characteristics of Aquatic Resources, Hunan Agricultural University, Changsha, 410128, PR China., Huang Y; College of Fisheries, Hunan Agricultural University, Changsha, 410128, PR China; Hunan Engineering Research Center for Utilization of Characteristics of Aquatic Resources, Hunan Agricultural University, Changsha, 410128, PR China., Li D; College of Fisheries, Hunan Agricultural University, Changsha, 410128, PR China; Hunan Engineering Research Center for Utilization of Characteristics of Aquatic Resources, Hunan Agricultural University, Changsha, 410128, PR China; Yuelushan Laboratory, Changsha, 410128, PR China. Electronic address: lidl@hunau.edu.cn., Zhang J; College of Fisheries, Hunan Agricultural University, Changsha, 410128, PR China; Hunan Engineering Research Center for Utilization of Characteristics of Aquatic Resources, Hunan Agricultural University, Changsha, 410128, PR China; Yuelushan Laboratory, Changsha, 410128, PR China. Electronic address: jzhang@hunau.edu.cn.
Πηγή: Environmental pollution (Barking, Essex : 1987) [Environ Pollut] 2026 Oct 15; Vol. 407, pp. 128822. Date of Electronic Publication: 2026 Jul 21.
Τύπος έκδοσης: Journal Article
Γλώσσα: English
Στοιχεία περιοδικού: Publisher: Elsevier Applied Science Publishers Country of Publication: England NLM ID: 8804476 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1873-6424 (Electronic) Linking ISSN: 02697491 NLM ISO Abbreviation: Environ Pollut Subsets: MEDLINE
Imprint Name(s): Original Publication: Barking, Essex, England : Elsevier Applied Science Publishers, c1987-
Ιατρικοί όροι (MeSH): Metals, Heavy*/analysis , Metals, Heavy*/metabolism , Rivers*/chemistry , Water Pollutants, Chemical*/metabolism , Water Pollutants, Chemical*/analysis , Food Chain* , Environmental Monitoring*, Fishes/metabolism ; Animals ; China
Περίληψη: Heavy metal contamination has long been a major environmental concern in the Xiangjiang River, a principal tributary of the Yangtze River that flows through one of China's most important nonferrous-metal-producing regions. However, trophic transfer of heavy metals within the river's fish assemblages remains poorly understood. In this study, fish were collected from four sections of the Xiangjiang River during the wet season. Concentrations of Cu, Zn, Pb, Cd, Mn, and As in muscle tissue were quantified together with carbon and nitrogen stable isotope ratios. Stable isotope analysis revealed differences in trophic position among feeding guilds, with mean trophic levels decreasing in the following order: carnivorous > omnivorous > filter-feeding > herbivorous. Element accumulation also varied among guilds. Herbivorous fish generally exhibited the lowest concentrations, whereas filter-feeding fish had relatively high concentrations of Cu and Mn, carnivorous fish of Zn, Cd, and As, and omnivorous fish of Pb. No significant relationships between element concentrations and trophic position were detected in the headwaters or the upper and middle reaches. In the lower reach, however, Cu and Mn concentrations decreased significantly with increasing δ15N, indicating trophic biodilution. These findings suggest that heavy metal accumulation in Xiangjiang River fish reflects the combined effects of feeding ecology, spatial variation in exposure, and element-specific physiological regulation rather than trophic position alone. This study advances understanding of contaminant transfer in mining-impacted riverine food webs and provides a scientific basis for fish-based biomonitoring and ecological risk assessment.
(Copyright © 2026 Elsevier Ltd. All rights reserved.)
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Contributed Indexing: Keywords: Food web; Heavy metals; Stable isotopes; Trophic transfer; Xiangjiang River
Substance Nomenclature: 0 (Metals, Heavy)
0 (Water Pollutants, Chemical)
Entry Date(s): Date Created: 20260721 Date Completed: 20260910 Latest Revision: 20260910
Update Code: 20260910
DOI: 10.1016/j.envpol.2026.128822
PMID: 42480959
Βάση Δεδομένων: MEDLINE
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  Data: Heavy metal accumulation and limited trophic transfer in the Xiangjiang River food web.
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  Data: <searchLink fieldCode="AU" term="%22Yang+T%22">Yang T</searchLink>; College of Fisheries, Hunan Agricultural University, Changsha, 410128, PR China; Hunan Engineering Research Center for Utilization of Characteristics of Aquatic Resources, Hunan Agricultural University, Changsha, 410128, PR China.<br /><searchLink fieldCode="AU" term="%22Huang+Y%22">Huang Y</searchLink>; College of Fisheries, Hunan Agricultural University, Changsha, 410128, PR China; Hunan Engineering Research Center for Utilization of Characteristics of Aquatic Resources, Hunan Agricultural University, Changsha, 410128, PR China.<br /><searchLink fieldCode="AU" term="%22Li+D%22">Li D</searchLink>; College of Fisheries, Hunan Agricultural University, Changsha, 410128, PR China; Hunan Engineering Research Center for Utilization of Characteristics of Aquatic Resources, Hunan Agricultural University, Changsha, 410128, PR China; Yuelushan Laboratory, Changsha, 410128, PR China. Electronic address: lidl@hunau.edu.cn.<br /><searchLink fieldCode="AU" term="%22Zhang+J%22">Zhang J</searchLink>; College of Fisheries, Hunan Agricultural University, Changsha, 410128, PR China; Hunan Engineering Research Center for Utilization of Characteristics of Aquatic Resources, Hunan Agricultural University, Changsha, 410128, PR China; Yuelushan Laboratory, Changsha, 410128, PR China. Electronic address: jzhang@hunau.edu.cn.
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  Data: <searchLink fieldCode="JN" term="%228804476%22">Environmental pollution (Barking, Essex : 1987)</searchLink> [Environ Pollut] 2026 Oct 15; Vol. 407, pp. 128822. <i>Date of Electronic Publication: </i>2026 Jul 21.
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  Data: Heavy metal contamination has long been a major environmental concern in the Xiangjiang River, a principal tributary of the Yangtze River that flows through one of China's most important nonferrous-metal-producing regions. However, trophic transfer of heavy metals within the river's fish assemblages remains poorly understood. In this study, fish were collected from four sections of the Xiangjiang River during the wet season. Concentrations of Cu, Zn, Pb, Cd, Mn, and As in muscle tissue were quantified together with carbon and nitrogen stable isotope ratios. Stable isotope analysis revealed differences in trophic position among feeding guilds, with mean trophic levels decreasing in the following order: carnivorous > omnivorous > filter-feeding > herbivorous. Element accumulation also varied among guilds. Herbivorous fish generally exhibited the lowest concentrations, whereas filter-feeding fish had relatively high concentrations of Cu and Mn, carnivorous fish of Zn, Cd, and As, and omnivorous fish of Pb. No significant relationships between element concentrations and trophic position were detected in the headwaters or the upper and middle reaches. In the lower reach, however, Cu and Mn concentrations decreased significantly with increasing δ<superscript>15</superscript>N, indicating trophic biodilution. These findings suggest that heavy metal accumulation in Xiangjiang River fish reflects the combined effects of feeding ecology, spatial variation in exposure, and element-specific physiological regulation rather than trophic position alone. This study advances understanding of contaminant transfer in mining-impacted riverine food webs and provides a scientific basis for fish-based biomonitoring and ecological risk assessment.<br /> (Copyright © 2026 Elsevier Ltd. All rights reserved.)
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  Data: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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  Data: <i>Keywords: </i>Food web; Heavy metals; Stable isotopes; Trophic transfer; Xiangjiang River
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