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<p>We quantified total mercury (THg) in feathers of Passeriformes from the Araguaia River floodplain (Brazil) to assess bioaccumulation and biomagnification across trophic guilds. Thirty-nine individuals from 22 non-migratory species were analyzed. Feather THg ranged from 0.05 to 2.35&#xa0;mg&#xa0;kg<sup>−1</sup> (d.w.), with highest concentrations in invertivores. Invertivorous birds exhibited consistently high biomagnification factors for all invertebrate prey. Omnivorous birds showed lower and more variable biomagnification, suggesting dietary diversification attenuates Hg transfer. Herbivorous birds also showed significant biomagnification, highlighting basal compartments as relevant exposure pathways. Feathers proved to be effective non-lethal indicators of Hg dynamics in Neotropical riparian food webs.</p>

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Screening of Mercury Bioaccumulation in Birds (Passeriformes) from a Major Wetland of the Brazilian Cerrado

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月9日

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  • Lucas Cabrera Monteiro,
  • Renato Caparroz,
  • Marcelo Lisita Junqueira,
  • Pedro Henrique Vogeley,
  • Ludgero Cardoso Galli Vieira,
  • José Vicente Elias Bernardi

摘要

We quantified total mercury (THg) in feathers of Passeriformes from the Araguaia River floodplain (Brazil) to assess bioaccumulation and biomagnification across trophic guilds. Thirty-nine individuals from 22 non-migratory species were analyzed. Feather THg ranged from 0.05 to 2.35 mg kg−1 (d.w.), with highest concentrations in invertivores. Invertivorous birds exhibited consistently high biomagnification factors for all invertebrate prey. Omnivorous birds showed lower and more variable biomagnification, suggesting dietary diversification attenuates Hg transfer. Herbivorous birds also showed significant biomagnification, highlighting basal compartments as relevant exposure pathways. Feathers proved to be effective non-lethal indicators of Hg dynamics in Neotropical riparian food webs.