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Arsenic and mercury exposure in different insect trophic guilds from mercury mining areas in Mexico

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Abstract

The exposure to arsenic and mercury in various insect trophic guilds from two mercury mining sites in Mexico was assessed. The two study sites were La Laja (LL) and La Soledad (LS) mines. Additionally, a reference site (LSR) was evaluated for LS. The terrestrial ecosystem was studied at LL, whereas both the terrestrial ecosystem and a stream called El Cedral (EC) were assessed at LS. The study sites are situated in the Biosphere Reserve Sierra Gorda (BRSG). Mercury vapor concentrations were measured with a portable analyzer, and concentrations of arsenic and mercury in environmental and biological samples were determined through atomic absorption spectrophotometry. Both pollutants were detected in all terrestrial ecosystem components (soil, air, leaves, flowers, and insects) from the two mines. The insect trophic guilds exposed included pollinivores, rhizophages, predators, coprophages, and necrophages. In LS, insects accumulated arsenic at levels 29 to 80 times higher than those found in specimens from LSR, and 10 to 46 times higher than those from LL. Similarly, mercury exposure in LS was 13 to 62 times higher than LSR, and 15 to 54 times higher than in LL. The analysis of insect exposure routes indicated potential exposure through air, soil, leaves, flowers, animal prey, carrion, and excrement. Water and sediment from EC exhibited high levels of arsenic and mercury compared to reference values, and predatory aquatic insects were exposed to both pollutants. In conclusion, insects from mercury mining sites in the BRSG are at risk.

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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgments

Consejo Nacional de Humanidades Ciencias y Tecnologías (CONAHCYT) of Mexico through the Investigadores por México (IxM) Program. Special thanks are extended to División de Estudios Superiores para la Paz de la Facultad de Medicina de la Universidad Autónoma de San Luis Potosí for their valuable advice and assistance. CARH received a fellowship from CONAHCYT for PhD studies (CVU 936383).

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The authors declare that no funds, grants, or other support were received during the preparation of this manuscript.

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Contributions

All authors contributed to the study´s conception. Carlos Alberto Rebolloso-Hernández: Conceptualization, methodology, investigation, writing – original draft. Moisés Roberto Vallejo-Pérez: Supervision, methodology, writing – review & editing, funding. Leticia Carrizales-Yáñez: Resources, methodology, validation. Gulio Jordan Garrigos-Lomelí: Methodology, writing – original draft. Israel Razo-Soto: Writing – review & editing. Fernando Díaz-Barriga: Funding acquisition, methodology, writing – review & editing.

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Correspondence to Moisés Roberto Vallejo-Pérez.

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Rebolloso-Hernández, C.A., Vallejo-Pérez, M.R., Carrizales-Yáñez, L. et al. Arsenic and mercury exposure in different insect trophic guilds from mercury mining areas in Mexico. Environ Monit Assess 196, 422 (2024). https://doi.org/10.1007/s10661-024-12571-9

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