Automated Nanocosm test system to assess the effects of stressors on two interacting populations

Foit, Kaarina; Kaske, Oliver; Wahrendorf, Dierk-Steffen; Duquesne, Sabine; Liess, Matthias

doi:10.1016/j.aquatox.2011.09.013

Cited by 14 publications

(10 citation statements)

References 24 publications

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“…The results from this experiment indicate that interspecies competition and grazing reduced the toxic effect of petroleum hydrocarbons at the community level, with similar studies on this topic also being reported (Arco et al, 2015;Viaene et al, 2015). Contrary to observations in the present study, species interactions have been found to result in greater toxic effects of pollutants (Foit et al, 2012;Gergs et al, 2013). These findings highlight the complexity of the impacts of ecological interactions on the sensitivity of populations together with the toxic effects of the pollutants.…”

Section: Threshold Concentration Of Petroleum Hydrocarbonssupporting

confidence: 86%

A method linking the toxic effects at community-level with contaminant concentrations

Wang

Zhang

et al. 2016

Science of The Total Environment

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• We tested petroleum hydrocarbon ecotoxicological effects on a simplified community.• Concentration-response relationships at a community-level were constructed.• A deduced no-effect concentration representing ecological interaction was named TCPE.• TCPE of petroleum hydrocarbons was higher than PNEC calculated from SSD.• Ecological interactions reduce toxic effect of petroleum hydrocarbons on a community. In this study, we developed a method to quantify and link the toxic effects in community-level ecosystems with concentrations of petroleum hydrocarbons. The densities of Platymonas helgolandica var. tsingtaoensis, Isochrysis galbana, and Brachionus plicatilis in single-species tests and customized ecosystems were examined in response to a concentration gradient of petroleum hydrocarbons ranging from 0 to 8.0 mg L −1 . A three-population ecological model with interspecies competition-grazing relationships was used to characterize population sizes with concentrations of petroleum hydrocarbons. A threshold concentration of the simplified plankton ecosystem of 0.376 mg L −1 for petroleum hydrocarbons was calculated from the proposed model, which was higher than the no-effect concentration of 0.056 mg L −1 derived from the single-species toxicity tests and the predicted no-effect concentration of 0.076 mg L −1 calculated from the species sensitivity distribution. This finding indicates that interspecies competition and grazing reduced the toxic effect of petroleum hydrocarbons at the community level. The sensitivity analysis for model parameters demonstrates that plankton population biomasses are highly sensitive to filtration rates. Antagonism between interspecies interactions and petroleum hydrocarbon toxicity was attributed to the reduced filtration rate and zooplankton grazing pressure. The proposed method is a simple G R A P H I C

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Section: Threshold Concentration Of Petroleum Hydrocarbonssupporting

confidence: 86%

A method linking the toxic effects at community-level with contaminant concentrations

Wang

Zhang

et al. 2016

Science of The Total Environment

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“…Although it has been generally assumed that competition enhances the negative effects of a toxicant (Foit et al, 2012;Stamplfli et al, 2011), some studies have shown that population-level effects of food limiting conditions under chemical stress could be outweighed under medium-high population densities and low toxicant concentrations (Gui and Grant, 2008;Linke-Gamenick et al, 1999;Barata et al, 2002). The results of the G. pulex experiment are consistent with the latter hypothesis and indicate behavioral changes as the main drivers determining the effects of competition.…”

Section: The Importance Of Ecological Interactions For Risk Assessmentsupporting

confidence: 75%

“…For instance, Stamplfli et al (2011) found that the abundance of zooplankton species was more affected by a pesticide under food limited conditions. Foit et al (2012) performed an experiment to test the competition effect on sensitivity and recovery capacity of two interacting populations (Daphnia magna and Culex pipiens molestus) and concluded that toxicant sensitivity was positively correlated to competition and delayed recovery. Therefore, there are evidences of both positive and negative combined effects of competition and toxicant effects.…”

Section: G Pulex Experimentsmentioning

confidence: 99%

“…Currently, the prospective Ecological Risk Assessment (ERA) of pesticides is mostly based on data obtained from single-species toxicity tests. Such an approach does not take into account ecological interactions between aquatic organisms such as competition or predation (Van den Brink, 2013;Brooks et al, 2009) and may therefore underestimate or overestimate pesticide risks for sensitive taxa and for the structure of aquatic communities (Beketov and Liess, 2006;Gui and Grant, 2008;Foit et al, 2012;De Laender and Janssen, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Effects of intra- and interspecific competition on the sensitivity of aquatic macroinvertebrates to carbendazim

Arco

Parra

Rico

et al. 2015

Ecotoxicology and Environmental Safety

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“…A detailed description of the nanocosm test system including its construction as well as the procedure and validation of the image analysis technique is described elsewhere. 17 …”

Section: Methodsmentioning

confidence: 99%

Culmination of Low-Dose Pesticide Effects

Liess¹,

Foit²,

Becker³

et al. 2013

Environ. Sci. Technol.

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Pesticides applied in agriculture can affect the structure and function of nontarget populations at lower doses and for longer timespans than predicted by the current risk assessment frameworks. We identified a mechanism for this observation. The populations of an aquatic invertebrate (Culex pipiens) exposed over several generations to repeated pulses of low concentrations of the neonicotinoid insecticide (thiacloprid) continuously declined and did not recover in the presence of a less sensitive competing species (Daphnia magna). By contrast, in the absence of a competitor, insecticide effects on the more sensitive species were only observed at concentrations 1 order of magnitude higher, and the species recovered more rapidly after a contamination event. The underlying processes are experimentally identified and reconstructed using a simulation model. We conclude that repeated toxicant pulse of populations that are challenged with interspecific competition may result in a multigenerational culmination of low-dose effects.

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Automated Nanocosm test system to assess the effects of stressors on two interacting populations

Cited by 14 publications

References 24 publications

A method linking the toxic effects at community-level with contaminant concentrations

A method linking the toxic effects at community-level with contaminant concentrations

Effects of intra- and interspecific competition on the sensitivity of aquatic macroinvertebrates to carbendazim

Culmination of Low-Dose Pesticide Effects

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