Learning performances of honeybees (<i>Apis mellifera</i> L) are differentially affected by imidacloprid according to the season

Decourtye, Axel; Lacassie, Éric; Pham-Delègue, M.H.

doi:10.1002/ps.631

Cited by 257 publications

(210 citation statements)

References 37 publications

(40 reference statements)

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“…R. Soc. B 282: 20151738 failure due to imidacloprid has mainly been related to impaired orientation ability and learning performance of honeybees [14,15,35,36]. Our results provide an alternative explanation for reduced homing success besides this impaired orientation ability and learning performance, namely that neonicotinoid insecticides reduce flight capacity, in particular when bees are simultaneously exposed to another stressor.…”

Section: Discussionmentioning

confidence: 72%

Interaction betweenVarroa destructorand imidacloprid reduces flight capacity of honeybees

2015

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Current high losses of honeybees seriously threaten crop pollination. Whereas parasite exposure is acknowledged as an important cause of these losses, the role of insecticides is controversial. Parasites and neonicotinoid insecticides reduce homing success of foragers (e.g. by reduced orientation), but it is unknown whether they negatively affect flight capacity. We investigated how exposing colonies to the parasitic mite Varroa destructor and the neonicotinoid insecticide imidacloprid affect flight capacity of foragers. Flight distance, time and speed of foragers were measured in flight mills to assess the relative and interactive effects of high V. destructor load and a field-realistic, chronic sub-lethal dose of imidacloprid. Foragers from colonies exposed to high levels of V. destructor flew shorter distances, with a larger effect when also exposed to imidacloprid. Bee body mass partly explained our results as bees were heavier when exposed to these stressors, possibly due to an earlier onset of foraging. Our findings contribute to understanding of interacting stressors that can explain colony losses. Reduced flight capacity decreases the food-collecting ability of honeybees and may hamper the use of precocious foraging as a coping mechanism during colony (nutritional) stress. Ineffective coping mechanisms may lead to destructive cascading effects and subsequent colony collapse.

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Section: Discussionmentioning

confidence: 72%

Interaction betweenVarroa destructorand imidacloprid reduces flight capacity of honeybees

2015

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“…In this paper, we illustrated these modes of exposure with the example of imidacloprid (formulation Gaucho ® ), but they might be used to describe the impact of any other systemic insecticides and their metabolites on honeybees, providing that their concentration in pollens and nectars are known. For example, the toxicity of the metabolites of imidacloprid Nauen et al, 2001;Decourtye et al, 2003), suggest that these molecules might also have an impact on honeybees.…”

Section: Discussionmentioning

confidence: 99%

“…These new regulatory tests need to assess the toxicity of these molecules and their metabolites. They might be elaborated on the grounds of existing experimental studies which have investigated the chronic impacts of these molecules on honeybees (Stoner et al, 1982;Suchail et al, 2001;Moncharmont et al, 2003), as well as their sublethal effects on honeybees behaviour (Cox and Wilson, 1984;Johansen, 1984;Taylor et al, 1987;Decourtye et al, 2003;Thompson, 2003) and physiology (Bounias et al, 1985;Bendahou et al, 1999;Papaefthimiou and Theophilidis, 2001).…”

Section: Discussionmentioning

confidence: 99%

Modes of honeybees exposure to systemic insecticides: estimated amounts of contaminated pollen and nectar consumed by different categories of bees

et al. 2005

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-The hazard posed to honeybees by systemic insecticides is determined by toxicity tests that are designed to study the effects of insecticides applied on the aerial parts of plants, but are not adapted to systemic substances used as soil or seed treatments. Based on the available data found in the literature, this paper proposes modes of honeybees exposure to systemic insecticides by estimating their pollen and nectar consumption. Estimates are given for larvae and for the categories of adults which consume the highest amounts ofpollen, the nurse bees, and -nectar, the wax-producing bees, the brood attending bees, the winter bees, and the foraging bees. As a case study, we illustrate these estimates with the example of imidacloprid because its concentrations in sunflower nectar and in sunflower and maize pollens of seed-dressed plants have been precisely determined, and because its levels of lethal, sublethal, acute, and chronic toxicities have been extensively investigated.Apis mellifera / systemic insecticide / exposure / imidacloprid / nectar / pollen

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“…To date, several studies have demonstrated that ingestion of small amounts of pesticides (e.g. imidacloprid, deltamethrin) by adult honeybees (Colin et al, 2001;Decourtye et al, 2003) interferes with the honeybees' learning and orientation capacity.…”

Section: Discussionmentioning

confidence: 99%

The Acute Oral Toxicity of Commonly Used Pesticides in Iran, to Honeybees (Apis Mellifera Meda)

Rasuli

Nazemi-Rafie

Sadeghi

2015

Journal of Apicultural Science

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A b s t r a c t The honey bee is credited with approximately 85% of the pollinating activity necessary to supply about one-third of the world's food supply. Well over 50 major crops depend on these insects for pollination. The crops produce more abundantly when honey bees are plentiful. Worker bees are the ones primarily affected by pesticides. Poisoning symptoms can vary depending on the developmental stage of the individual bee, and the kind of chemical employed. The oral toxicity of these insecticides: (phosalone and pirimicarb), acaricide (propargite), insecticide and acaricide (fenpropathrin), fungicides, and bactericides (copper oxychloride and the Bordeaux mixture), were evaluated for the purposes of this research. The results showed that fenpropathrin had high acute oral toxicity (LC 50 -24h and LC 50 -48 were 0.54 and 0.3 ppm, respectively). Propargite had 7785 ppm (active ingredient) for LC 50 -24h and 6736 ppm (active ingredient) for LC 50 -48h in honeybees and is therefore, non-toxic to Apis mellifera. On the other hand, copper oxychloride had minimum acute oral toxicity to honeybees (LC 50 -24h and LC 50 -48 were 4591.5 and 5407.9 ppm, respectively) and was therefore considered non-toxic. Also, the Bordeaux mixture was safe to use around honeybees. Phosalone and primicarb were considered highly and moderately toxic to honeybees, respectively.

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Learning performances of honeybees (Apis mellifera L) are differentially affected by imidacloprid according to the season

Cited by 257 publications

References 37 publications

Interaction betweenVarroa destructorand imidacloprid reduces flight capacity of honeybees

Interaction betweenVarroa destructorand imidacloprid reduces flight capacity of honeybees

Modes of honeybees exposure to systemic insecticides: estimated amounts of contaminated pollen and nectar consumed by different categories of bees

The Acute Oral Toxicity of Commonly Used Pesticides in Iran, to Honeybees (Apis Mellifera Meda)

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