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Impact of sublethal exposure to synthetic and natural acaricides on honey bee (Apis mellifera) memory and expression of genes related to memory.

Authors
  • Gashout, Hanan A1
  • Guzman-Novoa, Ernesto2
  • Goodwin, Paul H2
  • Correa-Benítez, Adriana3
  • 1 Plant Protection Dept., Faculty of Agriculture, University of Tripoli, P. O. Box 13538, Tripoli, Libya; School of Environmental Sciences, University of Guelph, 50 Stone Road East, Guelph N1G 2W1, Ontario, Canada. Electronic address: [email protected] , (Canada)
  • 2 School of Environmental Sciences, University of Guelph, 50 Stone Road East, Guelph N1G 2W1, Ontario, Canada. , (Canada)
  • 3 Departamento de Medicina y Zootecnia en Abejas, FMVZ, UNAM, Cd. Univ., Mexico 04510, Mexico. , (Mexico)
Type
Published Article
Journal
Journal of insect physiology
Publication Date
Jan 01, 2020
Volume
121
Pages
104014–104014
Identifiers
DOI: 10.1016/j.jinsphys.2020.104014
PMID: 31923391
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Acaricides are used by beekeepers in honey bee (Apis mellifera L.) colonies to control parasitic mites, but may also have adverse effects to honey bees. In this study, five commonly used acaricides were tested for their sublethal effects on memory and expression of neural-related genes in honey bees. Memory measured with the proboscis extension reflex (PER) assay was significantly reduced by topical treatment of bees with a single LD05 dose of formic acid at 2 and 24 h post treatment (hpt). However, tau-fluvalinate, amitraz, coumaphos, and formic acid, but not thymol, resulted in memory loss at 48 hpt. The LD05 doses of the acraricides did not affect expression of neuroligin-1, related to memory, or expression of major royal jelly protein-1, related to both memory and development, although expression of both genes was affected at LD50 doses. The LD05 doses of thymol, formic acid, amitraz and coumaphos increased defensin-1 expression, which is related to both memory and immunity. The effect of thymol, however, may have been due to its impact on the immune response rather than memory. This study demonstrates that acaricides vary in their effects on bee's memory, and that the widely used acaricide, formic acid, is particularly damaging. Copyright © 2020 Elsevier Ltd. All rights reserved.

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