Impact of 2,4-D and fipronil on the tropical midge Chironomus sancticaroli (Diptera: Chironomidae)

Pinto, Thandy Junio da Silva; Moreira, Raquel Aparecida; Silva, Laís Conceição Menezes da; Yoshii, Maria Paula Cardoso; Goulart, Bianca Veloso; Fraga, Priscille Dreux; Montagner, Cassiana Carolina; Daam, Michiel A.; Espíndola, Evaldo Luiz Gaeta

doi:10.1016/j.ecoenv.2020.111778

Cited by 40 publications

(16 citation statements)

References 83 publications

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“…The fipronil concentration necessary to kill half of a population of chironomid midges in eight days (i.e. EC50) is about 3.7 ug L -1 (Pinto et al, 2021), a concentration more than four times lower than the one found in 'sugarcane' ponds after the fipronil pulse. Amphibians, however, have an estimated lethal concentration (i.e.…”

Section: Discussionmentioning

confidence: 90%

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Impacts of agrochemical intensification on the assembly and reassembly of a mainland-island model metacommunity

Pelinson¹,

Br²,

Em³

et al. 2021

Preprint

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Many lentic aquatic environments are found embedded in agricultural fields, forming complex metacommunity structures. These habitats are vulnerable to contamination by agrochemicals, which can differentially affect local communities depending on the intensity and variability of species dispersal rates. We conducted a field experiment to assess how agrochemical intensification simulating the conversion of savannas into managed pastures and sugarcane fields affects freshwater community structure at different levels of spatial isolation. We constructed forty-five 1,200-L artificial ponds in a savanna landscape at three distances from a source wetland (30 m, 120 m, and 480 m). Ponds were spontaneously colonized by aquatic insects and amphibians and treated with no agrochemicals (savanna treatment), fertilizers (pasture treatment), or fertilizers and a single pulse of the insecticide fipronil and the herbicide 2,4-D (sugarcane treatment) following realistic dosages and application schedules. The experiment encompassed the entire rainy season. Pasture communities were only slightly different from controls largely because two predatory insect taxa were more abundant in pasture ponds. Sugarcane communities strongly diverged from other treatments after the insecticide application, when a decrease in insect abundance indirectly benefitted amphibian populations. However, this effect had nearly disappeared by the end of the rainy season. The herbicide pulse had no effect on community structure. Spatial isolation changed community structure by increasing the abundance of non-predatory insects. However, it did not affect all predatory insects nor, surprisingly, amphibians. Therefore, spatial isolation did not change the effects of agrochemicals on community structure. Because agrochemical application frequently overlaps with the rainy season in many monocultures, it can strongly affect temporary pond communities. Ponds embedded in pastures might suffer mild consequences of fertilization by favoring the abundance of few predators through bottom-up effects. Ponds in sugarcane fields, however, might experience a decline in the insect population, followed by an increase in the abundance of amphibians tolerant to environmental degradation. Furthermore, we found no evidence that isolation by distance can change the general effects of chemical intensification, but future experiments should consider using real crop fields as the terrestrial matrix since they can represent different dispersal barriers.

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Section: Discussionmentioning

confidence: 90%

“…In addition to community patterns, we acknowledge that possible behavioral, physiological, and morphological changes that may be caused by pesticide exposure (e.g. Freitas et al, 2019;Pinto et al, 2021) could result in important long-term changes in regional metacommunity patterns, however, such effects fall beyond the scope of this study.…”

Section: Resultsmentioning

confidence: 99%

Impacts of agrochemical intensification on the assembly and reassembly of a mainland-island model metacommunity

Pelinson¹,

Br²,

Em³

et al. 2021

Preprint

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“…Subchronic test was performed for 8 days of exposure (Pinto et al 2021). For that, four larvae were used in each of the four replicates of all dilutions -control and AgNP concentrations, totalizing 20 larvae per treatment and 96 in total.…”

Section: Risk Assessment Measures From the Ssd Modelmentioning

confidence: 99%

Nanosilver toxicity thresholds estimative for aquatic and sediment environmental safety

Vl¹,

Jonsson²,

Msgm³

et al. 2021

Preprint

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Silver nanoparticles (AgNPs) have been largely utilized. Despite that, comprehensive studies on their ecotoxicological effects and environmental risk are still required. In the present study, the AgNPs effect was assessed to some organisms including algae, plants, microcrustaceans, cnidaria, nematodes, aquatic insect, earthworm, and fish embryos. The no-observed-effect concentration (NOEC) was calculated for each organism using a log-logistic function. AgNPs remained stable in contact with culture media during the analyzed period and conditions employed, presenting dispersion less than 20%, except for Artemia salina medium. On this occasion, NPs presented dispersion of approximately 25%, although their size remained unchangeable. The Predicted No Effect Concentration (PNEC) of AgNPs in the aquatic compartment was estimated in the concentration range from 0.13 to 0.66 µg L-1. A Risk Quotient (RQ) of 15.1 was derived for the NP tested with the aid of a maximum AgNPs Predicted Environmental Concentration (PEC) estimated value. The RQ value superior to one indicates a risk and the need for its management measures implementation. These data, in addition to the expected increase in AgNPs use, reinforce the importance of the AgNPs safety levels establishment that can contribute to performing their risk assessment studies.

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“…Os insetos da família Chironomidae são comumente utilizados como bioindicadores e têm diversos pontos de resposta ("endpoints"), PASCOE, 1996;OCDE 233, 2010;GO-MES et al, 2018). Por esses motivos, essa espécie vem sendo utilizada em diversos estudos ecotoxicológicos (ANDRADE-MORRAYE et al, 2004;FONSECA;ROCHA, 2004a;ALMEIDA, 2007;CAMPAGNA et al, 2013;COLOMBO-CORBI et al, 2017;DORNFELD et al, 2019;PINTO et al, 2021).…”

Section: Chironomus Sancticaroli Strixino and Strixino 1981unclassified

BIOINDICADORES DE QUALIDADE AQUÁTICA: NOVAS POSSIBILIDADES DE ANÁLISES UTILIZANDO LARVAS DE Aedes aegypti (DIPTERA: CULICIDAE) E Chironomus sancticaroli (DIPTERA: CHIRONOMIDAE)

Moura¹,

Nadai²,

Oyamaguti³

et al. 2021

Indicadores Biológicos De Qualidade Em Ambientes Aquáticos Continentais: Métricas E Recortes Para Análises

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Impact of 2,4-D and fipronil on the tropical midge Chironomus sancticaroli (Diptera: Chironomidae)

Cited by 40 publications

References 83 publications

Impacts of agrochemical intensification on the assembly and reassembly of a mainland-island model metacommunity

Impacts of agrochemical intensification on the assembly and reassembly of a mainland-island model metacommunity

Nanosilver toxicity thresholds estimative for aquatic and sediment environmental safety

BIOINDICADORES DE QUALIDADE AQUÁTICA: NOVAS POSSIBILIDADES DE ANÁLISES UTILIZANDO LARVAS DE Aedes aegypti (DIPTERA: CULICIDAE) E Chironomus sancticaroli (DIPTERA: CHIRONOMIDAE)

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