Neonicotinoid insecticide mixtures: Evaluation of laboratory-based toxicity predictions under semi-controlled field conditions

Maloney, Erin M.; Liber, Karsten; Headley, John V.; Peru, Kerry M.; Morrissey, Christy A.

doi:10.1016/j.envpol.2018.09.008

Cited by 24 publications

(20 citation statements)

References 27 publications

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“…It should be noted that thiacloprid is not the only and also not the most common neonicotinoid polluting surface waters. Neonicotinoids are often found in mixtures and share a common mode of action (Morrissey et al, ) that can add up to toxicity (Maloney, Liber, Headley, Peru, & Morrissey, ). We compare our findings of strong decline in natural emergence at environmentally relevant concentrations to data on Odonate abundance and distribution trends collected by citizen scientist from the ‘Dutch Dragonfly Monitoring Scheme’ of the Dutch Butterfly Conservation (Van Swaay et al, ).…”

Section: Discussionmentioning

confidence: 99%

Environmental levels of neonicotinoids reduce prey consumption, mobility and emergence of the damselfly Ischnura elegans

Barmentlo

Vriend

Grunsven

et al. 2019

Journal of Applied Ecology

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1. Freshwaters are among the most endangered ecosystems in the world as a result of anthropogenic interference such as pollution. Pollution in the form of neonicotinoids has been intensively studied, but data thus far is often conflicted by contrasting responses between laboratory and field experiments. In addition, toxicity data are scarce and contradictory for insects such as Odonates (dragonflies and damselflies) and a potential risk to them may therefore be overlooked.2. We investigate the potential risk of neonicotinoids to Odonates by exposing nymphs of the blue-tailed damselfly Ischnura elegans to environmentally relevant concentrations of the neonicotinoid thiacloprid. We consider I. elegans as an indicator species for other Odonates as it is an abundant, widespread and eurytopic species. We analyse the effects of thiacloprid on multiple endpoints (survival, consumption, growth, molting, mobility and emergence), using cage-experiments as well as controlled field observations in naturally colonized experimental ditches.In addition, we assess sensitivity by either feeding the damselfly nymphs with lab-cultured prey or by letting them feed freely on natural aquatic invertebrates.3. All sublethal endpoints of I. elegans are affected to some degree, and strongly depend on the food offered; free-feeding nymphs are more sensitive than culturefed nymphs. Environmental relevant concentrations of thiacloprid strongly reduce the emergence of I. elegans and this effect is more substantial in the natural populations compared to the caged damselflies. This is likely explained by exclusion of additional biotic pressures such as predation in the caged experiment. 4. Policy implications. Literature reports that one out of seven Odonates is threatened and 24% of the species have declining populations. Our observations show that current risks of neonicotinoids to Odonates are underestimated in laboratory experiments as the toxicity is governed by multiple biotic factors such as food quantity/quality and predation. Given the widespread abundance of blue-tailed damselfly Ischnura elegans, the observed sensitivity to neonicotinoids and current | 2035 Journal of Applied Ecology BARMENTLO ET AL.

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Section: Discussionmentioning

confidence: 99%

Environmental levels of neonicotinoids reduce prey consumption, mobility and emergence of the damselfly Ischnura elegans

Barmentlo

Vriend

Grunsven

et al. 2019

Journal of Applied Ecology

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“…Toxicity of multiple neonicotinoids seems to be synergistic in aquatic systems. Using experimental in situ enclosures, chronic toxicity of imidacloprid, clothianidin, and thiamethoxam (and their mixtures) to natural aquatic insect communities showed that the cumulative emergence of insects after the mixture treatments was 42%, 20%, and 44% lower, respectively, than when the three neonicotinoids were applied separately (11). No reports are available on the synergistic toxicity of neonicotinoids on C. plumosus, but mixtures of neonicotinoids have probably negatively influenced C. plumosus, other macrobenthos, and zooplankton such as S. tenellus.…”

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confidence: 99%

Neonicotinoids disrupt aquatic food webs and decrease fishery yields

Yamamuro

Komuro

Kamiya

et al. 2019

Science

204

111

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Invertebrate declines are widespread in terrestrial ecosystems, and pesticide use is often cited as a causal factor. Here, we report that aquatic systems are threatened by the high toxicity and persistence of neonicotinoid insecticides. These effects cascade to higher trophic levels by altering food web structure and dynamics, affecting higher-level consumers. Using data on zooplankton, water quality, and annual fishery yields of eel and smelt, we show that neonicotinoid application to watersheds since 1993 coincided with an 83% decrease in average zooplankton biomass in spring, causing the smelt harvest to collapse from 240 to 22 tons in Lake Shinji, Shimane Prefecture, Japan. This disruption likely also occurs elsewhere, as neonicotinoids are currently the most widely used class of insecticides globally.

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“…No reuse allowed without permission. (Maloney et al, 2018a). We observed a greater negative effect of the neonicotinoid mixture on Ceriodaphnia dubia than after exposure to each compound alone.…”

Section: Discussionmentioning

confidence: 60%

“…Recent studies have focused on the effects of neonicotinoid mixture on aquatic invertebrates (Loureiro et al, 2010;Pavlaki et al, 2011;Maloney et al, 2018a) and have underscored the complexity of extrapolated lab-derived mixture models to predict the effects on field populations (which was not certified by peer review) is the author/funder. All rights reserved.…”

Section: Discussionmentioning

confidence: 99%

“…We observed a greater negative effect of the neonicotinoid mixture on Ceriodaphnia dubia than after exposure to each compound alone. Maloney et al(2018a) reported that binary and ternary mixtures of imidacloprid, clothianidin, and thiamethoxam had greater than additive effects on the freshwater midge Chironomus dilutus. However, our study was not designed to assess additive and synergetic effects of neonicotinoid mixtures on daphnids and this should be addressed in further experiments.…”

Section: Discussionmentioning

confidence: 99%

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Chronic toxicity of three neonicotinoid insecticides and their mixture on two daphniid species: Daphnia magna and Ceriodaphnia dubia

Duchet

et al. 2021

Preprint

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Neonicotinoid insecticides represent nearly a quarter of the global market and are widely used in agriculture but also for lawn, garden care, and pest control. They are highly water-soluble, persistent in soil, and may enter the aquatic compartment via spray drift, runoff, or leaching, and contribute to downstream aquatic toxicity. Although insects appear to be the most sensitive group to neonicotinoids, other groups, such as crustaceans and birds, may also be affected. Furthermore, most studies focus on single-insecticide exposure and very little is known concerning the impact of neonicotinoid mixtures on aquatic invertebrates. The present study was designed to test potential toxicological effects of an environmentally relevant mixture of imidacloprid, clothianidin, and thiamethoxam on populations of Ceriodaphnia dubia and Daphnia magna under controlled conditions. Chronic toxicity tests were conducted in the laboratory, and survival and reproduction were measured for both species under exposure to nominal concentrations of imidacloprid (0.256 μg/L), clothianidin (3.11 μg/L), thiamethoxam (1.49 μg/L), and a mixture of the three compounds at the same concentrations of the individual compounds. The neonicotinoids did not affect the survival of C. dubia and D. magna founders. Reproduction of C. dubia was affected only by the mixture. All three individual insecticides as well as the mixture caused a significant reduction in the reproduction of D. magna. Our results highlight the complexity of pesticide toxicity and show that traditional toxicological approaches such as acute mortality studies, especially tests with single compounds, can underestimate negative impacts that occur in the environment.

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Neonicotinoid insecticide mixtures: Evaluation of laboratory-based toxicity predictions under semi-controlled field conditions

Cited by 24 publications

References 27 publications

Environmental levels of neonicotinoids reduce prey consumption, mobility and emergence of the damselfly Ischnura elegans

Environmental levels of neonicotinoids reduce prey consumption, mobility and emergence of the damselfly Ischnura elegans

Neonicotinoids disrupt aquatic food webs and decrease fishery yields

Chronic toxicity of three neonicotinoid insecticides and their mixture on two daphniid species: Daphnia magna and Ceriodaphnia dubia

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