Short- and Long-Term Effects of the Pyrethroid Insecticide Fenvalerate on an Invertebrate Pond Community

Woin, Per

doi:10.1006/eesa.1998.1694

Cited by 41 publications

(30 citation statements)

References 41 publications

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“…mayflies) and waterfleas. Similar responses have been observed with pond communities exposed to fenvalerate spraying (Woin 1998). The point to be made here, however, is that changes in the communities over time are intimately related to the dissipation of insecticide residues from the system as well as the interspecific interactions within the same community or between communities (Liess 2002).…”

Section: Discussionsupporting

confidence: 53%

Evaluation of suitable endpoints for assessing the impacts of toxicants at the community level

Sánchez‐Bayo

Goka

2011

Ecotoxicology

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Assessment of ecological impacts of toxicants relies currently on extrapolation of effects observed at organismal or population levels. The uncertainty inherent to such extrapolations, together with the impossibility of predicting ecological effects of chemical mixtures, can only be resolved by adopting approaches that consider toxicological endpoints at a community or ecological level. Experimental data from micro- and mesocosms provide estimates of community effect levels, which can then be used to confirm or correct the extrapolations from theoretical methods such as species sensitivity distributions (SSDs) or others. When assessing impacts, the choice of sensitive community endpoints is important. Four community endpoints (species richness, abundance, diversity and similarity indices) were evaluated in their ability to assess impacts of two insecticides, imidacloprid and etofenprox, and their mixture on aquatic and benthic communities from artificial rice paddies. Proportional changes of each community endpoint were expressed by ratios between their values in the treatment and control paddies. Regression lines fitted to the endpoint ratios against the time series of chemical concentrations were used to predict percentile impacts in the communities. The abundance endpoint appears to be the most sensitive indicator of the communities' response, but the Czekanowski similarity index described best the structural changes that occur in all communities. Aquatic arthropods were more sensitive to the mixture of both insecticides than zooplankton and benthic communities. Estimated protective levels for 95% of aquatic species exposed to imidacloprid (<0.01-1.0 μg l(-1)) were slightly lower than predicted by SSD, whereas for etofenprox the protective concentrations in water (<0.01-0.58 μg l(-1)) were an order of magnitude lower than SSD's predictions.

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Section: Discussionsupporting

confidence: 53%

Evaluation of suitable endpoints for assessing the impacts of toxicants at the community level

Sánchez‐Bayo

Goka

2011

Ecotoxicology

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“…Woin [27] reports of a similar outcome in a mesocosm pond invertebrate community after exposure to fenvalerate. Because the species composition of control channels also had changed, this indicates that the frequency and intensity of these high-flow events had a more marked influence on community structure than a single pulse exposure of lambda-cyhalothrin.…”

Section: Benthic Densities Of Macroinvertebratesmentioning

confidence: 89%

Macroinvertebrate community response to pulse exposure with the insecticide lambda‐cyhalothrin using in‐stream mesocosms

Heckmann¹,

Friberg²

2005

Enviro Toxic and Chemistry

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Pesticides are constantly being applied to agricultural catchments, but little is known about their impact on aquatic biota during natural exposure. In the present study, the impact of the pyrethroid lambda-cyhalothrin was studied in an in-stream mesocosm setup. Twice during the summer of 2002, the natural macroinvertebrate community was exposed in situ to a 30-min pulse of lambda-cyhalothrin. Pyrethroid doses were released through a modified drip set with nominal concentrations of 0.10, 1.00, and 10.0 microg L(-1) during the first exposure and 0.05, 0.50, and 5.00 microg L(-1) in the second exposure. Before, during, and after exposure, drifting macroinvertebrates were caught in nets. Quantitative benthic samples were taken both before and on two occasions after exposure. Macroinvertebrate drift increased immediately after the pulse exposure, with total drift being significantly higher at all concentrations. Gammarus pulex, various Ephemeroptera, Leuctra sp., and Simuliidae were some of the taxa showing the most pronounced drift response. Structural change in the community was found only at 5.00 and 10.0 microg L(-1), and recovery occurred within approximately two weeks. The present study may be valuable in assessing extrapolations based on laboratory results as well as in evaluating pyrethroid impact on natural freshwater environments.

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“…For example, there is a long history in ecological studies of examining community impacts either as ''pulse'' experiments (i.e., a single disturbance) or ''press'' experiments (i.e., multiple disturbances [Bender et al 1984, Paine et al 1998, Clements and Newman 2002). Additional studies have focused on a community's ability to rebound from pulse treatments and found that the resiliency depends on pesticide breakdown rate, organism generation time, dispersal rates, and the regional species pool (Wallace et al 1996, Spawn et al 1997, Woin 1998, Brock et al 2000a. Additional studies have focused on a community's ability to rebound from pulse treatments and found that the resiliency depends on pesticide breakdown rate, organism generation time, dispersal rates, and the regional species pool (Wallace et al 1996, Spawn et al 1997, Woin 1998, Brock et al 2000a.…”

Section: Introductionmentioning

confidence: 99%

An Unforeseen Chain of Events: Lethal Effects of Pesticides on Frogs at Sublethal Concentrations

Relyea¹,

Diecks

2008

Ecological Applications

161

148

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The field of toxicology has traditionally assessed the risk of contaminants by using laboratory experiments and a range of pesticide concentrations that are held constant for short periods of time (1-4 days). From these experiments, one can estimate the concentration that causes no effect on survival. However, organisms in nature frequently experience multiple, applications of pesticides over time rather than a single constant concentration. In addition, organisms are embedded in ecological communities that can propagate indirect effects through a food web. Using outdoor mesocosms, we examined how low concentrations (10-250 microg/L) of a globally common insecticide (malathion) applied at various amounts, times, and frequencies affected aquatic communities containing zooplankton, phytoplankton, periphyton, and larval amphibians (reared at two densities) for 79 days. All application regimes caused a decline in zooplankton, which initiated a trophic cascade in which there was a bloom in phytoplankton and, in several treatments, a subsequent decline in the competing periphyton. The reduced periphyton had little effect on wood frogs (Rana sylvatica), which have a short time to metamorphosis. However, leopard frogs (Rana pipiens) have a longer time to metamorphosis, and they experienced large reductions in growth and development, which led to subsequent mortality as the environment dried. Hence, malathion (which rapidly breaks down) did not directly kill amphibians, but initiated a trophic cascade that indirectly resulted in substantial amphibian mortality. Importantly, repeated applications of the lowest concentration (a "press treatment" consisting of seven weekly applications of 10 microg/L) caused larger impacts on many of the response variables than single "pulse" applications that were 25 times as great in concentration. These results are not only important because malathion is the most commonly applied insecticide and is found in wetlands, but also because the mechanism underlying the trophic cascade is common to a wide range of insecticides, offering the possibility of general predictions for the way in which many insecticides impact aquatic communities and the populations of larval amphibians.

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Short- and Long-Term Effects of the Pyrethroid Insecticide Fenvalerate on an Invertebrate Pond Community

Cited by 41 publications

References 41 publications

Evaluation of suitable endpoints for assessing the impacts of toxicants at the community level

Evaluation of suitable endpoints for assessing the impacts of toxicants at the community level

Macroinvertebrate community response to pulse exposure with the insecticide lambda‐cyhalothrin using in‐stream mesocosms

An Unforeseen Chain of Events: Lethal Effects of Pesticides on Frogs at Sublethal Concentrations

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