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Environment & Sustainability

Banned pesticides detected in seabirds

4 Abr 2022
- by Dr Alison Halliday

Banned pesticides detected in seabirdsA new study finds that seabirds living in estuaries and coastal areas are exposed to neonicotinoids, highlighting the need to investigate the extent of contamination in the environment.

Neonicotinoids are among the most popular insecticides in the world. These neurotoxic substances are either coated onto crop seeds, sprayed onto plants, or injected into trees – and are especially effective against sucking pests, such as aphids, and also chewing insects.

Scientists have linked the use of neonicotinoids to the decline of honey bee populations and other pollinators. In 2013, the European Union severely restricted the use of clothianidin, imidacloprid and thiamethoxam – and all three pesticides were completely banned for outdoor agricultural use in 2018.

But neonicotinoids are widespread in the environment – and they may also have harmful effects on other wildlife. Among vertebrates, birds are particularly susceptible to unintentional neonicotinoid poisoning as they can be exposed by eating coated seeds or sprayed insects, sucking contaminated pollen, or consuming contaminated prey.

Residues in seabirds

In a new study, published in Environmental Research, researchers investigate the possible contamination of two seabird species with different trophic habits: the strictly fish-eating Sandwich tern and an opportunistic omnivore, the Mediterranean gull.1

The researchers used high-performance liquid-chromatography-electrospray ionisation tandem mass spectrometry (HPLC/ESI-MS/MS) to measure the concentration of five neonicotinoid residues (acetamiprid, clothianidin, imidacloprid, thiacloprid and thiamethoxam) in pooled feather samples collected from chicks in Venice’s Lagoon, Italy in June 2019.

Overall, at least one neonicotinoid was quantified in 100% of the Mediterranean gull samples and 89% of Sandwich tern samples. Imidacloprid and clothianidin were both detected in all Mediterranean gull samples and around 60% of Sandwich tern samples, while thiacloprid was detected in less than 20% of samples in both species. The average concentrations for imidacloprid, clothianidin and thiamethoxam were 8.8 ± 1.4, 4.5 ± 0.19 and 0.16 ± 0.02 ng/g for the Mediterranean gull, and 5.8 ± 0.55, 0.6 ± 0.08 and 0.36 ± 0.03 ng/g for the Sandwich tern, respectively.

The team used ultrapure water generated from an ELGA PURELAB® laboratory water purification system, minimising the risk of introducing contaminants that may affect their results.

Broader environmental impact

This research shows seabirds at the top of the aquatic food webs in estuaries and coastal areas are exposed to neonicotinoids. Residues were found in both omnivorous and exclusive fish-eaters, confirming that seabirds with different trophic habits may be affected by the widespread presence of these pesticides in the environment.

Despite the EU regulations restricting the outdoor use of clothianidin, imidacloprid and thiamethoxam, residues of these substances can still be measured in the feathers of an exclusive fish-eating species after the ban came into force, suggesting that inputs in surface waters are still relevant – for example, through leaching, leakage or unintentional discharge from greenhouses.

The authors recommend introducing measures to monitor the trend of neonicotinoid concentrations in estuaries – and also highlight the need for more research to explore the potential long-term effects of chronic exposure to these substances in vertebrates.

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Reference:

  1. Distefano, G. et al. The ubiquity of neonicotinoid contamination: Residues in seabirds with different trophic habits. Environ Res. 2021;206:112637
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ELGA LabWater works with a network of Approved Partners. In order to answer your questions or enquiries, we may pass your contact details to an Approved Partner, who may contact you directly. 

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