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Vet Pathol

Title:		Reproductive fitness of honey bee queens exposed to thiamethoxam during development
Author(s):		Kozii IV; Barnsley S; Silva M; Wood SC; Klein CD; de Mattos IM; Zabrodski MW; Silva RCM; Fabela CIO; Guillemin L; Dvylyuk I; Ferrari MCO; Simko E;
Address:		"70399University of Saskatchewan, Saskatoon, Saskatchewan, Canada"
Journal Title:		Vet Pathol
Year:		2021
Volume:		20210716
Issue:		6
Page Number:		1107 - 1118
DOI:		10.1177/03009858211031845
ISSN/ISBN:		1544-2217 (Electronic) 0300-9858 (Print) 0300-9858 (Linking)
Abstract:		"The productivity and survival of honey bee (Apis mellifera) colonies depend on queen bee health. Colony-level neonicotinoid exposure has negative effects on reproductive fitness of honey bee queens. However, it is unclear if the observed effects are a direct outcome of neonicotinoid toxicity or result from suboptimal care of developing queens by exposed workers. The aim of this study was to evaluate larval survival, reproductive fitness, and histopathology of honey bee queens exposed to incremental doses (0, 5, 50 ng) of the neonicotinoid thiamethoxam (THI) applied directly to individual late larvae (7 days post-oviposition) of queens. The 5 ng dose represents a calculated high environmental level of exposure for honey bee queen larvae. Morphometric evaluation revealed that the total area of mandibular gland epithelium in queens exposed to 5 and 50 ng THI was reduced by 14% (P = .12) and 25% (P = .001), respectively. Decreased mandibular gland size may alter pheromone production, which could in part explain previously observed negative effects of THI on the reproductive fitness of queens. We also found that late larval exposure to THI reduced larval and pupal survival and decreased sperm viability in mated queens. These changes may interfere with queen development and reproductive longevity"
Keywords:		Animals Bees Female *Genetic Fitness Larva Neonicotinoids/toxicity Thiamethoxam Apis mellifera development insecticides mandibular gland neonicotinoids ovary queens;
Notes:		"MedlineKozii, Ivanna V Barnsley, Sarah Silva, Marina Carla Bezerra da Wood, Sarah C Klein, Colby D de Mattos, Igor M Zabrodski, Michael W Silva, Roney de C M Fabela, Claudia I O Guillemin, Leland Dvylyuk, Ihor Ferrari, Maud C O Simko, Elemir eng Research Support, Non-U.S. Gov't 2021/07/17 Vet Pathol. 2021 Nov; 58(6):1107-1118. doi: 10.1177/03009858211031845. Epub 2021 Jul 16"