Survival rate and changes in foraging performances of solitary bees exposed to a novel insecticide

Boff, Samuel; Scheiner, Ricarda; Raizer, Josué; Lupi, D.

doi:10.1016/j.ecoenv.2020.111869

Cited by 33 publications

(28 citation statements)

References 47 publications

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“…We can therefore expect that residues will increase for the remaining neonicotinoids such as acetamiprid (17) and novel insecticides such as flupyradifurone (84), sulfoxaflor (85,153), and cyantraniliprole (154). Some of them also bind to nicotinic FIGURE 3 | Number of publications on different neonicotinoid insecticides and novel products binding to nicotinic acetylcholine receptors.…”

Section: Discussionmentioning

confidence: 99%

“…In addition to these exceptions to the ban of neonicotinoids, novel substitutes for neonicotinoids such as flupyradifurone or sulfoxaflor have reached the market (82)(83)(84)(85). These bind to the same neurotransmitter receptors in the brain of insects and even though they generally appear to be less toxic to honeybees, in Germany they can only be used in greenhouses to protect honeybees and wild bees (86) 11 .…”

Section: Insecticides Neonicotinoidsmentioning

confidence: 99%

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Interaction of Insecticides and Fungicides in Bees

et al. 2022

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Honeybees and wild bees are among the most important pollinators of both wild and cultivated landscapes. In recent years, however, a significant decline in these pollinators has been recorded. This decrease can have many causes including the heavy use of biocidal plant protection products in agriculture. The most frequent residues in bee products originate from fungicides, while neonicotinoids and, to a lesser extent, pyrethroids are among the most popular insecticides detected in bee products. There is abundant evidence of toxic side effects on honeybees and wild bees produced by neonicotinoids, but only few studies have investigated side effects of fungicides, because they are generally regarded as not being harmful for bees. In the field, a variety of substances are taken up by bees including mixtures of insecticides and fungicides, and their combinations can be lethal for these pollinators, depending on the specific group of insecticide or fungicide. This review discusses the different combinations of major insecticide and fungicide classes and their effects on honeybees and wild bees. Fungicides inhibiting the sterol biosynthesis pathway can strongly increase the toxicity of neonicotinoids and pyrethroids. Other fungicides, in contrast, do not appear to enhance toxicity when combined with neonicotinoid or pyrethroid insecticides. But the knowledge on possible interactions of fungicides not inhibiting the sterol biosynthesis pathway and insecticides is poor, particularly in wild bees, emphasizing the need for further studies on possible effects of insecticide-fungicide interactions in bees.

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Section: Discussionmentioning

confidence: 99%

Section: Insecticides Neonicotinoidsmentioning

confidence: 99%

Interaction of Insecticides and Fungicides in Bees

et al. 2022

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“…SFX’s effect was studied by the International Organization for biological Control (IOBC), and revealed a low impact on beneficial arthropods such as Macrolophus caliginosus (Hemiptera), and Harmonia axyridis (Coleoptera) [ 14 ]. It was recently shown that exposure of solitary bees to a field-realistic dose of SFX leads to impairment of foraging and flight performances [ 15 ]. Other authors described no major impacts of SFX on honeybees in a realistic-exposure protocol [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

Impairments in learning and memory performances associated with nicotinic receptor expression in the honeybee Apis mellifera after exposure to a sublethal dose of sulfoxaflor

et al. 2022

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Sulfoxaflor is a new insecticide which acts on the nicotinic acetylcholine receptor (nAChRs) in a similar way to neonicotinoids. However, sufloxaflor (SFX) is thought to act in a different manner and is thus proposed as an alternative in crop protection. The goal of this study is to evaluate the toxicity of SFX and its sublethal effect on the honeybee Apis mellifera after acute exposure. In toxicological assay studies, the LD50 value and sublethal dose (corresponding to the NOEL: no observed effect level) were 96 and 15 ng/bee, respectively. Using the proboscis extension response paradigm, we found that an SFX dose of 15 ng/bee significantly impairs learning and memory retrieval when applied 12 h before conditioning or 24 h after olfactory conditioning. SFX had no effect on honeybee olfactory performance when exposure happened after the conditioning. Relative quantitative PCR experiments performed on the six nicotinic acetylcholine receptor subunits demonstrated that they are differently expressed in the honeybee brain after SFX exposure, whether before or after conditioning. We found that intoxicated bees with learning defects showed a strong expression of the Amelβ1 subunit. They displayed overexpression of Amelα9 and Amelβ2, and down-regulation of Amelα1, Amelα3 and Amelα7 subunits. These results demonstrated for the first time that a sublethal dose of SFX could affect honeybee learning and memory performance and modulate the expression of specific nAChR subunits in the brain.

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“…Sub-lethal and long-term effects can act together giving unpredictable consequences, since chronic exposure to adverse stressors gradually weakens colonies, decreases their performance, progressively reduces queen fecundity and modifies the ability of workers to learn and forage [31][32][33] However, while many are the studies reporting the effects of a single stress factor [34][35][36][37], fewer and more recent are the studies evaluating the role of multiple-factor interaction on honeybees [38][39][40][41]. Studies of combined stressors in the laboratory allow for adding information on direct effects on bees but are far from approaching the complexity of the real world.…”

Section: Introductionmentioning

confidence: 99%

Combined Effects of Pesticides and Electromagnetic-Fields on Honeybees: Multi-Stress Exposure

Lupi

Mesiano

Adani

et al. 2021

Insects

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Honeybee and general pollinator decline is extensively reported in many countries, adding new concern to the general biodiversity loss. Many studies were addressed to assess the causes of pollinator decline, concluding that in most cases multi-stress effects were the most probable ones. In this research, the combined effects of two possible stress sources for bees, pesticides and electromagnetic fields (multi-stress conditions), were analyzed in the field. Three experimental sites were chosen: a control one far from direct anthropogenic stress sources, a pesticide-stress site and multi-stress one, adding to the same exposure to pesticides the presence of an electromagnetic field, coming from a high-voltage electric line. Experimental apiaries were monitored weekly for one year (from April 2017 to April 2018) by means of colony survival, queen activity, storage and brood amount, parasites and pathogens, and several biomarkers in young workers and pupae. Both exposure and effect biomarkers were analysed: among the first, acetylcholinesterase (AChE), catalase (CAT), glutathione S-transferase (GST) and alkaline phosphatase (ALP) and Reactive Oxygen Species (ROS); and among the last, DNA fragmentation (DNAFRAGM) and lipid peroxidation (LPO). Results showed that bee health conditions were the worst in the multi-stress site with only one colony alive out of the four ones present at the beginning. In this site, a complex picture of adverse effects was observed, such as disease appearance (American foulbrood), higher mortality in the underbaskets (common to pesticide-stress site), behavioral alterations (queen changes, excess of honey storage) and biochemical anomalies (higher ALP activity at the end of the season). The overall results clearly indicate that the multi-stress conditions were able to induce biochemical, physiological and behavioral alterations which severely threatened bee colony survival.

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Survival rate and changes in foraging performances of solitary bees exposed to a novel insecticide

Cited by 33 publications

References 47 publications

Interaction of Insecticides and Fungicides in Bees

Interaction of Insecticides and Fungicides in Bees

Impairments in learning and memory performances associated with nicotinic receptor expression in the honeybee Apis mellifera after exposure to a sublethal dose of sulfoxaflor

Combined Effects of Pesticides and Electromagnetic-Fields on Honeybees: Multi-Stress Exposure

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