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The trophodynamics of polycyclic aromatic hydrocarbons in marine food webs: The importance of trophic level span from insights into Liaodong Bay (China). | LitMetric

The trophodynamics of polycyclic aromatic hydrocarbons in marine food webs: The importance of trophic level span from insights into Liaodong Bay (China).

Environ Res

Nanjing University of Information Science & Technology, Nanjing, 210044, China; Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment of the People's Republic of China, Nanjing, 210042, China; Ningxia University, Yinchuan, 750021, China. Electronic address:

Published: December 2024

AI Article Synopsis

  • The study investigates the levels and transfer of polycyclic aromatic hydrocarbons (PAHs) in aquatic ecosystems, focusing on their presence in seawater, sediment, plankton, and various marine species from Liaodong Bay, China.
  • PAHs concentrations were found to vary significantly across environments, with specific types of PAHs being the most prominent, and evidence of low bioaccumulation in marine organisms while showing contrasting biomagnification patterns in top predators.
  • The research highlights the importance of trophic levels in understanding how PAHs move through food webs, indicating both trophic dilution in some cases and trophic magnification in others.

Article Abstract

The occurrence and trophic transfer of polycyclic aromatic hydrocarbons (PAHs) in aquatic ecosystems is vital to assess ecological risks. PAHs concentrations were analyzed in seawater, sediment, plankton, and marine species (15 fish species, 8 invertebrate species, 3 marine mammals), collected from Liaodong Bay (China). Bioaccumulation and biomagnification were calculated to demonstrate the biotransfer pattern of PAHs from the environmental matrix to high-level predators through the food web. Total PAHs concentrations ranged from 81.2 to 197.6 ng/L in seawater, 51.4-304.8 ng/g (dw) in sediment, and 65.3 to 28,885 ng/g (lw) in all biota samples. Three- and four-ring PAHs constituted major components (>81% in each case) of PAH congener profiles. Lower biota-sediment accumulation factors (BSAFs) and bioaccumulation factors (BAFs) values indicated limited bioaccumulation of PAHs within marine organisms. Also, 77% of biomagnification factors (BMF) values of PAHs in spotted seal and finless porpoise were >1, whereas opposite transfer patterns of PAHs were observed in food webs with trophic values of 1.5-3.5 and 3.0-4.0; that is, trophic dilution (trophic magnification factor (TMF) < 1) and trophic magnification (TMF >1), respectively. This study provides novel insights into the importance of TL span for trophodynamics of PAHs within food webs.

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Source
http://dx.doi.org/10.1016/j.envres.2024.120202DOI Listing

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