Compound-specific nitrogen isotope of amino acids: Toward an improved understanding of mercury trophic transfer in different habitats.

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  • Additional Information
    • Source:
      Publisher: Elsevier Country of Publication: Netherlands NLM ID: 9422688 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1873-3336 (Electronic) Linking ISSN: 03043894 NLM ISO Abbreviation: J Hazard Mater Subsets: MEDLINE
    • Publication Information:
      Original Publication: Amsterdam : Elsevier,
    • Subject Terms:
      Food Chain* ; Nitrogen Isotopes* ; Mercury*/analysis ; Amino Acids*/chemistry ; Amino Acids*/analysis ; Feathers*/chemistry ; Birds* ; Environmental Monitoring*; Animals ; Ecosystem ; China ; Water Pollutants, Chemical/analysis
    • Abstract:
      Herein, we investigated the trophic transfer of mercury (Hg) through food chains in different habitats (namely aquatic, riparian, and terrestrial) through bulk stable isotope analysis of nitrogen (δ 15 N bulk ) and compound-specific isotope analysis of nitrogen in amino acids (δ 15 N AA ) using bird feathers and their potential food sources from a Hg-contaminated site in southwest China. Results showed similar δ 15 N phe for water birds (4.7 ± 2.6 ‰) and aquatic food sources (5.2 ± 2.1 ‰) and for land-based food sources (10.1 ± 0.4 ‰) and terrestrial birds (11.6 ± 3.0 ‰), verifying δ 15 N phe as a potential discriminant indicator for different food sources. The trophic positions (TPs) of most organisms based on δ 15 N bulk (TP bulk ) tended to overestimate compared with those based on δ 15 N AA (TP AA ), especially for predators (such as kingfisher: ΔTP = 1.3). Additionally, significant differences were observed in the aquatic, riparian, and terrestrial food webs between trophic magnification slope (TMS) bulk and TMS AA (p < 0.05). The trophic magnification factor (TMF) AA-multiple based on multiple-AAs in three food webs were higher than the TMF AA and TMF bulk , probably because of the greater variation of δ 15 N baseline , complex food sources or the notably different in individual organisms. Altogether, our results improve the understanding of Hg trophic transfer in aquatic, riparian, and terrestrial food webs.
      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.
      (Copyright © 2024 Elsevier B.V. All rights reserved.)
    • Contributed Indexing:
      Keywords: Bioaccumulation; Biotransfer; Compound-specific isotope analysis; Food web; Mercury; Methylmercury
    • Accession Number:
      0 (Nitrogen Isotopes)
      FXS1BY2PGL (Mercury)
      0 (Amino Acids)
      0 (Water Pollutants, Chemical)
    • Publication Date:
      Date Created: 20240617 Date Completed: 20240625 Latest Revision: 20240625
    • Publication Date:
      20240626
    • Accession Number:
      10.1016/j.jhazmat.2024.134927
    • Accession Number:
      38885586