| Title: | Honeybees fail to discriminate floral scents in a complex learning task after consuming a neonicotinoid pesticide |
| Author(s): | Mustard JA; Gott A; Scott J; Chavarria NL; Wright GA; |
| Address: | "Department of Biology, University of Texas Rio Grande Valley, Brownsville, TX 78520, USA. Institute of Neuroscience, Newcastle University, Newcastle upon Tyne NE2 4HH, UK. Department of Zoology, University of Oxford, Oxford OX1 3SZ, UK. Institute of Neuroscience, Newcastle University, Newcastle upon Tyne NE2 4HH, UK geraldine.wright@zoo.ox.ac.uk" |
| ISSN/ISBN: | 1477-9145 (Electronic) 0022-0949 (Print) 0022-0949 (Linking) |
| Abstract: | "Neonicotinoids are pesticides used to protect crops but with known secondary influences at sublethal doses on bees. Honeybees use their sense of smell to identify the queen and nestmates, to signal danger and to distinguish flowers during foraging. Few behavioural studies to date have examined how neonicotinoid pesticides affect the ability of bees to distinguish odours. Here, we used a differential learning task to test how neonicotinoid exposure affects learning, memory and olfactory perception in foraging-age honeybees. Bees fed with thiamethoxam could not perform differential learning and could not distinguish odours during short- and long-term memory tests. Our data indicate that thiamethoxam directly impacts the cognitive processes involved in working memory required during differential olfactory learning. Using a combination of behavioural assays, we also identified that thiamethoxam has a direct impact on the olfactory perception of similar odours. Honeybees fed with other neonicotinoids (clothianidin, imidacloprid, dinotefuran) performed the differential learning task, but at a slower rate than the control. These bees could also distinguish the odours. Our data are the first to show that neonicotinoids have compound specific effects on the ability of bees to perform a complex olfactory learning task. Deficits in decision making caused by thiamethoxam exposure could mean that this is more harmful than other neonicotinoids, leading to inefficient foraging and a reduced ability to identify nestmates" |
| Keywords: | Animals Bees/drug effects/*physiology Flowers Guanidines/adverse effects Insecticides/*adverse effects Learning/drug effects Memory/drug effects Neonicotinoids/adverse effects Nitro Compounds/adverse effects Odorants Olfactory Perception/*drug effects Thi;neuroscience; |
| Notes: | "MedlineMustard, Julie A Gott, Anne Scott, Jennifer Chavarria, Nancy L Wright, Geraldine A eng BB/S000402/1/BB_/Biotechnology and Biological Sciences Research Council/United Kingdom Research Support, Non-U.S. Gov't England 2020/02/08 J Exp Biol. 2020 Feb 28; 223(Pt 5):jeb217174. doi: 10.1242/jeb.217174" |
