Predator cues magnify effects of the pesticide endosulfan in water bugs in a multi-species test in outdoor containers

Trekels, Hendrik; Meutter, Frank Van de; Stoks, Robby

doi:10.1016/j.aquatox.2013.04.008

Cited by 23 publications

(20 citation statements)

References 56 publications

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“…Studies suggest that impact from pesticides may be magnified in the presence of predator cues [30]; thus, predators represent a natural stressor that is especially important for prey population dynamics in aquatic ecosystems [31]. For example, pesticide exposure combined with predator cues (mayfly larvae and damselfly larvae) caused synergistic effects on survival and biomass of water bugs (Corixidae) [32]. Odonates were the largest predators in the mesocosms, and they decreased toward the end of the present study, possibly caused by the significant decrease of their prey (e.g., D. magna and H. azteca).…”

Section: Discussionmentioning

confidence: 99%

A long‐term assessment of pesticide mixture effects on aquatic invertebrate communities

Hasenbein

Lawler

Geist

et al. 2015

Enviro Toxic and Chemistry

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To understand the potential effects of pesticide mixtures on aquatic ecosystems, studies that incorporate increased ecological relevance are crucial. Using outdoor mesocosms, the authors examined long-term effects on aquatic invertebrate communities of tertiary mixtures of commonly used pesticides: 2 pyrethroids (permethrin, λ-cyhalothrin) and an organophosphate (chlorpyrifos). Application scenarios were based on environmentally relevant concentrations and stepwise increases of lethal concentrations from 10% (LC10) to 50% (LC50) based on laboratory tests on Hyalella azteca and Chironomus dilutus; repeated applications were meant to generally reflect runoff events in a multiple-grower or homeowner watershed. Pyrethroids rapidly dissipated from the water column, whereas chlorpyrifos was detectable even 6 wk after application. Twelve of 15 macroinvertebrate and 10 of 16 zooplankton taxa responded to contaminant exposures. The most sensitive taxa were the snail Radix sp., the amphipod H. azteca, the water flea Daphnia magna, and copepods. Environmentally relevant concentrations had acute effects on D. magna and H. azteca (occurring 24 h after application), whereas lag times were more pronounced in Radix sp. snails and copepods, indicating chronic sublethal responses. Greatest effects on zooplankton communities were observed in environmentally relevant concentration treatments. The results indicate that insecticide mixtures continue to impact natural systems over multiple weeks, even when no longer detectable in water and bound to particles. Combinations of indirect and direct effects caused consequences across multiple trophic levels.

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Section: Discussionmentioning

confidence: 99%

A long‐term assessment of pesticide mixture effects on aquatic invertebrate communities

Hasenbein

Lawler

Geist

et al. 2015

Enviro Toxic and Chemistry

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“…This pesticide has been reported to increase the vulnerability of aquatic invertebrates to predation (e.g., Janssens and Stoks ; Trekels et al. ).…”

Section: Introductionmentioning

confidence: 99%

Evolution determines how global warming and pesticide exposure will shape predator–prey interactions with vector mosquitoes

Tran

Janssens

Dinh

et al. 2016

Evolutionary Applications

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How evolution may mitigate the effects of global warming and pesticide exposure on predator–prey interactions is directly relevant for vector control. Using a space‐for‐time substitution approach, we addressed how 4°C warming and exposure to the pesticide endosulfan shape the predation on Culex pipiens mosquitoes by damselfly predators from replicated low‐ and high‐latitude populations. Although warming was only lethal for the mosquitoes, it reduced predation rates on these prey. Possibly, under warming escape speeds of the mosquitoes increased more than the attack efficiency of the predators. Endosulfan imposed mortality and induced behavioral changes (including increased filtering and thrashing and a positional shift away from the bottom) in mosquito larvae. Although the pesticide was only lethal for the mosquitoes, it reduced predation rates by the low‐latitude predators. This can be explained by the combination of the evolution of a faster life history and associated higher vulnerabilities to the pesticide (in terms of growth rate and lowered foraging activity) in the low‐latitude predators and pesticide‐induced survival selection in the mosquitoes. Our results suggest that predation rates on mosquitoes at the high latitude will be reduced under warming unless predators evolve toward the current low‐latitude phenotype or low‐latitude predators move poleward.

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“…In contrast, the predator cues did not magnify the toxicity of chlorpyrifos in any strain. Although synergisms between synthetic pesticides and predator cues have often been observed (e.g …”

Section: Discussionmentioning

confidence: 99%

“…While many studies have demonstrated that exposure to predator cues may increase the toxicity of single pesticides ( e.g …”

Section: Discussionmentioning

confidence: 99%

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Effects of predator cues and pesticide resistance on the toxicity of a (bio)pesticide mixture

Delnat

Janssens

Stoks

2019

Pest Management Science

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BACKGROUND Populations of target species are typically exposed to pesticide mixtures and natural stressors such as predator cues, and are increasingly developing resistance to single pesticides. Nevertheless, we have poor knowledge whether natural stressors and the presence of pesticide resistance shape mixture toxicity. We tested the single and combined effects of the pesticide chlorpyrifos and the biopesticide Bacillus thuringiensis israelensis (Bti) on the survival of the Southern house mosquito (Culex quinquefasciatus, Say) and whether these effects were magnified by synthetic predator cues of Notonecta water bugs and differed between a chlorpyrifos‐resistant (Ace‐1R) and non‐resistant (S‐Lab) strain. RESULTS Single exposure to Bti caused mortality in both strains (S‐Lab ∼27%, Ace‐1R ∼41%) and single exposure to chlorpyrifos caused only mortality in the S‐Lab strain (∼33%), while predator cues did not induce mortality. The chlorpyrifos‐resistant strain was 1.5‐fold more sensitive to Bti, indicating a cost of resistance. The interaction types between chlorpyrifos and Bti (additive), between chlorpyrifos and predator cues (additive), and between Bti and predator cues (synergistic) were consistent in both strains. Despite predator cues making Bti approximately 8% more lethal, they did not change the additive interaction between Bti and chlorpyrifos in their mixture in either strain. CONCLUSION These results indicate that the resistance against chlorpyrifos was not partly lifted when chlorpyrifos exposure was combined with Bti and predator cues. Identifying the interaction type within pesticide mixtures and how this depends on natural stressors is important to select control strategies that give a disadvantage to resistant individuals compared to non‐resistant individuals. © 2019 Society of Chemical Industry

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Predator cues magnify effects of the pesticide endosulfan in water bugs in a multi-species test in outdoor containers

Cited by 23 publications

References 56 publications

A long‐term assessment of pesticide mixture effects on aquatic invertebrate communities

A long‐term assessment of pesticide mixture effects on aquatic invertebrate communities

Evolution determines how global warming and pesticide exposure will shape predator–prey interactions with vector mosquitoes

Effects of predator cues and pesticide resistance on the toxicity of a (bio)pesticide mixture

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