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Residual ground-water levels of the neonicotinoid thiacloprid perturb chemosensing of Caenorhabditis elegans

Floyd, Kieran G.; Hancock, John T; Hopewell, Hannah; Ladomery, Michael; Burnell, Daniel; Wilson, Ian D; Allainguillaume, Joel


Kieran G. Floyd

Hannah Hopewell

Daniel Burnell


© 2017, The Author(s). This study investigated the neurological effects of residual ground-water levels of thiaclopridon the non-target organism Caenorhabditis elegans. Nematodes treated with thiacloprid showed a dose-dependent and significantly increased twitch response at concentrations above 50 ng mL−1 that disabled their forward locomotion in liquid culture. In comparison with untreated controls, 10 ng mL−1 thiacloprid perturbed the chemosensory ability of C. elegans such that the nematodes no longer demonstrated positive chemotaxis towards a NaCl chemo-attractant, reducing their chemotaxis index from +0.48 to near to zero. Nematodes also exhibited a locomotion characteristic of those devoid of chemo-attraction, making significantly more pirouetting turns of ≥90° than the untreated controls. Compared to the untreated controls, expression of the endocytosis-associated gene, Rab-10, was also increased in C. elegans that had developed to adulthood in the presence of 10 ng mL−1 thiacloprid, suggesting their active engagement in increased recycling of affected cellular components, such as their nAChRs. Thus, even residual, low levels of this less potent neonicotinoid that may be found in field ground-water had measurable effects on a beneficial soil organism which may have environmental and ecological implications that are currently poorly understood.


Floyd, K. G., Hopewell, H., Burnell, D., Hancock, J. T., Allainguillaume, J., Ladomery, M., & Wilson, I. D. (2017). Residual ground-water levels of the neonicotinoid thiacloprid perturb chemosensing of Caenorhabditis elegans. Ecotoxicology, 26(7), 981-990.

Journal Article Type Article
Acceptance Date Jun 10, 2017
Online Publication Date Jun 22, 2017
Publication Date Sep 1, 2017
Deposit Date Jul 4, 2017
Publicly Available Date Aug 1, 2017
Journal Ecotoxicology
Print ISSN 0963-9292
Electronic ISSN 1573-3017
Publisher Springer Verlag
Peer Reviewed Peer Reviewed
Volume 26
Issue 7
Pages 981-990
Keywords neonicotinoid, thiacloprid, chemosensing, nematodes, Caenorhabditis elegans
Public URL
Publisher URL
Additional Information Additional Information : The final publication is available at Springer via


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