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Sub-lethal pesticide exposure interferes with honey bee memory of learnt colours.
Sci Total Environ
January 2025
Molecular Biology, Genetics and Bioengineering Program, Faculty of Engineering and Natural Sciences, Sabancı University, Tuzla, Istanbul, Türkiye; USDA/ARS/WRRC, Invasive Species and Pollinator Health Research Unit, Davis, CA 95616, USA. Electronic address:
Neonicotinoid pesticide use has increased around the world despite accumulating evidence of their potential detrimental sub-lethal effects on the behaviour and physiology of bees, and its contribution to the global decline in bee health. Whilst flower colour is considered as one of the most important signals for foraging honey bees (Apis mellifera), the effects of pesticides on colour vision and memory retention in a natural setting remain unknown. We trained free flying honey bee foragers by presenting artificial yellow flower feeder, to an unscented artificial flower patch with 6 different flower colours to investigate if sub-lethal levels of imidacloprid would disrupt the acquired association made between the yellow flower colour from the feeder and food reward.
View Article and Find Full Text PDFDemethylation Inhibitor Fungicides Have a Significantly Detrimental Impact on Population Growth and Composition of Nectar Microbial Communities.
Microb Ecol
December 2024
Department of Animal Health, Complutense University of Madrid, 28040, Madrid, Spain.
Demethylation inhibitor (DMI) fungicides are a mainstay of modern agriculture due to their widespread use for crop protection against plant-pathogenic fungi. However, DMI residues can disperse and persist in the environment, potentially affecting non-target fungi. Previous research has demonstrated that DMIs and other fungicides inhibit yeast growth in floral nectar microbial communities and decrease fungal richness and diversity of exposed flowers with no apparent effect on bacteria.
View Article and Find Full Text PDFPavlovian-Type Learning in Environmental Bacteria: Regulation of Herbicide Resistance by Arsenic in Pseudomonas putida.
Environ Microbiol
December 2024
Systems Biology Department, Centro Nacional de Biotecnología-CSIC, Madrid, Spain.
The canonical arsRBC genes of the ars1 operon in Pseudomonas putida KT2440, which confer tolerance to arsenate and arsenite, are followed by a series of additional ORFs culminating in phoN1. The phoN1 gene encodes an acetyltransferase that imparts resistance to the glutamine synthetase inhibitor herbicide phosphinothricin (PPT). The co-expression of phoN1 and ars genes in response to environmental arsenic, along with the physiological effects, was analysed through transcriptomics of cells exposed to the oxyanion and phenotypic characterization of P.
View Article and Find Full Text PDFUnravelling impacts of the insecticide deltamethrin on neuronal sodium channels in honey bees: Molecular insights and behavioural outcomes.
Chemosphere
December 2024
Institut National de la Recherche pour l'Agriculture, l'Alimentation et l'Environnement, UR406 Abeilles et Environnement, 84914, Avignon, France. Electronic address:
The current risk assessment framework for insecticides suffers from certain shortcomings in adequately addressing the effects of low doses on off-target species. To remedy this gap, a combination of behavioural assays and in vitro cellular approaches are required to refine the precision of toxicity assessment. The domestic honey bee has long been standing as an emblematic pollinator in ecotoxicology, and once more, it provides us with a practical testing model for this purpose.
View Article and Find Full Text PDFApplication of some cationic pullulan and curdlan derivatives as flocculants in fungicides-containing wastewater purification.
Int J Biol Macromol
December 2024
Faculty of Chemical Sciences and Engineering, Autonomous University of Baja, California, CP: 22424 Tijuana, Baja California, Mexico.
The ability of some cationic pullulan (TMAP-P) and curdlan (TMAP-C) derivative to remove different fungicide particles from synthetic wastewater has been studied. Commercial fungicides formulations of different type, Bordeaux mixture (BM), Dithan M45 (Dt) and Melody Compact49 WG (MC) have been used. The influence of some parameters related to the dispersion characteristics (suspension pH and salinity) and the polysaccharide derivatives (polymer dose, the ionic groups content, flexibility) on the separation process have been assessed.
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