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Aebi, Alexandre

Nom
Aebi, Alexandre
Affiliation principale
Site web
Fonction
MER
Email
alexandre.aebi@unine.ch
Identifiants
https://libra.unine.ch/handle/123456789/769
_
0000-0003-2309-1497

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  • Publication
    Accès libre
    Les pesticides: lacunes et alternatives
    (2020-2-9)
    Aebi, Alexandre 
    ;
    Mitchell, Edward 
    Les études de l’impact des néonicotinoïdes sur les abeilles ont permis une prise de conscience sur la toxicité de ces molécules. Mais ces insectes ne sont pas les seuls à subir les conséquences de l’usage massif des pesticides en agriculture conventionnelle. En nous focalisant sur l’abeille, ne risque-t-on pas de négliger les effets sur les autres organismes vivants?
  • Publication
    Accès libre
    Ultra-trace level determination of neonicotinoids in honey as a tool for assessing environmental contamination
    (2019-2-5)
    Kammoun, Souad
    ;
    Mulhauser, Blaise
    ;
    Aebi, Alexandre 
    ;
    Mitchell, Edward 
    ;
    Glauser, Gaetan
    Neonicotinoids and the closely related insecticide classes sulfoximines and butenolides have recently attracted growing concerns regarding their potential negative effects on non-target organisms, including pollinators such as bees. Indeed, it is becoming increasingly clear that these effects may occur at much lower levels than those considered to be safe for humans. To properly assess the ecological and environmental risks posed by neonicotinoids, appropriate sampling and analytical procedures are needed. Here, we used honey as reliable environmental sampler and developed an unprecedentedly sensitive method based on QuEChERS and UHPLC-MS/MS for the simultaneous determination of the nine neonicotinoids and related molecules currently present on the market (acetamiprid, clothianidin, dinotefuran, flupyradifurone, imidacloprid, nitenpyram, sulfoxaflor, thiacloprid and thiamethoxam). The method was validated and provided excellent levels of precision and accuracy over a wide concentration range of 3–4 orders of magnitude. Lowest limits of quantification (LLOQs) as low as 2–20 pg/g of honey depending on the analytes were reached. The method was then applied to the analysis of 36 honey samples from various regions of the World which had already been analysed for the five most common neonicotinoids (acetamiprid, clothianidin, imidacloprid, thiacloprid and thiamethoxam) in a previous study. This allowed us to determine the long-term stability (i.e. up to 40 months) of these molecules in honey, both at room temperature and −20 °C. We found that the five pesticides were stable over a period of several years at −20 °C, but that acetamiprid and thiacloprid partially degraded at room temperature. Finally, we also measured the levels of dinotefuran, nitenpyram, sulfoxaflor and flupyradifurone and found that 28% of the samples were contaminated by at least one of these pesticides.
  • Publication
    Accès libre
    Pesticides: Berne doit jouer la transparence
    (2018-11-25)
    Aebi, Alexandre 
    ;
    Mitchell, Edward 
    OPINION. Deux chercheurs de l’Université de Neuchâtel, Alexandre Aebi et Edward Mitchell, demandent à l’Office fédéral de l’agriculture de publier les informations détaillées sur l’usage des pesticides en Suisse, après une première communication insatisfaisante
  • Publication
    Accès libre
    Comment promouvoir une agriculture qui protège et profite de la biodiversité?
    (2018-11-1)
    Aebi, Alexandre 
    ;
    Moinet, Gabriel
    ;
    Mitchell, Edward 
    Le déclin de la biodiversité et l’alté- ration des services écosystémiques mettent en péril la production à long terme de denrées alimentaires et de fourrage. Il est nécessaire de se tourner vers des systèmes de production agricole basés sur l’utili- sation de la diversité biologique et sur des écosystèmes en bon état de fonctionnement. L’agroécologie pro- pose de nouvelles solutions en la matière
  • Publication
    Accès libre
    An update of the Worldwide Integrated Assessment (WIA) on systemic insecticides. Part 2: Impacts on organisms and ecosystems
    (2017-11-9)
    Pisa, Lennard
    ;
    Goulson, Dave
    ;
    Yang, En-Cheng
    ;
    Gibbons, David
    ;
    Sánchez-Bayo, Francisco
    ;
    Mitchell, Edward 
    ;
    Aebi, Alexandre 
    ;
    van der Sluijs, Jeroen
    ;
    MacQuarrie, Chris JK
    ;
    Giorio, Chiara
    ;
    Yim Long, Elizabeth
    ;
    McField, Melanie
    ;
    Bijleveld van Lexmond, Maarten
    ;
    Bonmatin, Jean-Marc
    New information on the lethal and sublethal effects of neonicotinoids and fipronil on organisms is presented in this review, complementing the previous Worldwide Integrated Assessment (WIA) in 2015. The high toxicity of these systemic insecticides to invertebrates has been confirmed and expanded to include more species and compounds. Most of the recent research has focused on bees and the sublethal and ecological impacts these insecticides have on pollinators. Toxic effects on other invertebrate taxa also covered predatory and parasitoid natural enemies and aquatic arthropods. Little new information has been gathered on soil organisms. The impact on marine and coastal ecosystems is still largely uncharted. The chronic lethality of neonicotinoids to insects and crustaceans, and the strengthened evidence that these chemicals also impair the immune system and reproduction, highlights the dangers of this particular insecticidal class (neonicotinoids and fipronil), with the potential to greatly decrease populations of arthropods in both terrestrial and aquatic environments. Sublethal effects on fish, reptiles, frogs, birds, and mammals are also reported, showing a better understanding of the mechanisms of toxicity of these insecticides in vertebrates and their deleterious impacts on growth, reproduction, and neurobehaviour of most of the species tested. This review concludes with a summary of impacts on the ecosystem services and functioning, particularly on pollination, soil biota, and aquatic invertebrate communities, thus reinforcing the previous WIA conclusions (van der Sluijs et al. 2015).
  • Publication
    Accès libre
    A worldwide survey of neonicotinoids in honey
    (2017-9-6)
    Mitchell, Edward 
    ;
    Mulhauser, Blaise
    ;
    Mulot, Matthieu 
    ;
    Mutabazi, Aline
    ;
    Glauser, Gaétan
    ;
    Aebi, Alexandre 
  • Publication
    Accès libre
    A worldwide survey of neonicotinoids in honey
    Mitchell, Edward 
    ;
    Mulhauser, Blaise
    ;
    Mulot, Matthieu 
    ;
    Mutabazi, A
    ;
    Glauser, Gaëtan 
    ;
    Aebi, Alexandre 
    Growing evidence for global pollinator decline is causing concern for biodiversity conservation and ecosystem services maintenance. Neonicotinoid pesticides have been identified or suspected as a key factor responsible for this decline. We assessed the global exposure of pollinators to neonicotinoids by analyzing 198 honey samples from across the world. We found at least one of five tested compounds (acetamiprid, clothianidin, imidacloprid, thiacloprid, and thiamethoxam) in 75% of all samples, 45% of samples contained two or more of these compounds, and 10% contained four or five. Our results confirm the exposure of bees to neonicotinoids in their food throughout the world. The coexistence of neonicotinoids and other pesticides may increase harm to pollinators. However, the concentrations detected are below the maximum residue level authorized for human consumption (average ± standard error for positive samples: 1.8 ± 0.56 nanograms per gram).