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Huang Z, Qadeer A, Zheng S, Ge F, Zhang K, Yin D, Zheng B, Zhao X. Fatty acid profile as an efficient bioindicator of PCB bioaccumulation in a freshwater lake food web: A stable isotope guided investigation. JOURNAL OF HAZARDOUS MATERIALS 2022; 423:127121. [PMID: 34534807 DOI: 10.1016/j.jhazmat.2021.127121] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Revised: 08/20/2021] [Accepted: 09/01/2021] [Indexed: 06/13/2023]
Abstract
In past studies, the health and ecological risks of PCBs are well established. The impact of low-dose PCBs on aquatic ecosystems for an extended period is a matter of concern in the current era. The application of fatty acids (FAs) as bioindicators of pollution in the freshwater food web is almost unavailable. This study investigated concentrations of 209 PCB congeners, stable isotope levels, and FAs composition in ten freshwater species of Dongtinghu Lake, China. Total PCB congeners (∑PCBs) concentrations were ranged from 4.17 to 38.35 ng/g lipid weight. A total of 84 PCB congeners were detected out of 209 target PCB congeners, particularly PCB101, 118, 138, 153, and 155 found in all samples. The concentrations of 24 PCB congeners increased with trophic levels, but PCB 155 concentrations were consistent throughout trophic levels. The toxic equivalents (TEQ) of dl-PCBs (mostly PCB 126 and 169) also increased with trophic levels Out of total 35 FAs, 21 FAs were significantly positively correlated with 43 PCB congeners. Among FAs, C16:0 was the most abundant and positively correlated with most PCB compounds. Positive correlations between FAs and PCBs indicated that FAs can be used as efficient bioindicators of PCBs pollution in the aquatic food web.
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Affiliation(s)
- Zhifeng Huang
- National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, State Environmental Protection Scientific Observation and Research Station for Lake Dongtinghu, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| | - Abdul Qadeer
- National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, State Environmental Protection Scientific Observation and Research Station for Lake Dongtinghu, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Saisai Zheng
- Nanchang Institute of Technology, Nanchang 330099, China
| | - Fangfang Ge
- National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, State Environmental Protection Scientific Observation and Research Station for Lake Dongtinghu, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Kexin Zhang
- National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, State Environmental Protection Scientific Observation and Research Station for Lake Dongtinghu, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Daqiang Yin
- Key Laboratory of Yangtze River Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| | - Binghui Zheng
- National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, State Environmental Protection Scientific Observation and Research Station for Lake Dongtinghu, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
| | - Xingru Zhao
- National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, State Environmental Protection Scientific Observation and Research Station for Lake Dongtinghu, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
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Trophic Patterns of Bighead Carp and Silver Carp Follow the Seasonality of Resource Availability. WATER 2019. [DOI: 10.3390/w11071429] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The influence of seasonality of the aquatic environment on food web has been notoriously understudied in empirical ecology. In this study, we focus on seasonal changes in one key attribute of a food web, the trophic level. We determine whether seasonal variations of fish trophic levels could be indicated by the change in food resources. Silver carp (Hypophthalmichthys molitrix) and bighead carp (H. nobilis) were used to explore the responses of trophic levels of the filter-feeding fish to seasonal variations of food resources. Combined stable isotopic analysis and dietary analysis revealed that filter-feeding fish tended to have a higher trophic level in spring (May) and autumn (September and October). This may result from the abundant density of food resources (zooplankton and phytoplankton) and fish flexible foraging strategy, as we predicted that the trophic level follows the seasonality of food availability. Pearson’ correlation analysis and a structural equation model showed that seasonal variation of total phosphorus and water temperature could indirectly affect trophic levels of silver carp and bighead carp by mediating the abundance of phytoplankton and zooplankton directly and indirectly along the food chain. According to these findings, the seasonal variation of food resources could be an important indicator of the temporal dynamics of the food web trophic pattern in freshwater ecosystems.
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