2010
DOI: 10.1002/etc.290
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Early signs of lethal effects in Daphnia magna (Branchiopoda, Cladocera) exposed to the insecticide cypermethrin and the fungicide azoxystrobin

Abstract: This study presents the effects of sublethal concentrations of pesticides cypermethrin and azoxystrobin on the activity of several physiological parameters of egg-carrying Daphnia magna studied using a video-image technique. Single tethered daphnids were continuously recorded for 24 h of pesticide exposure, and the activity of the heart, the filtering limbs, the mandibles, and the focal spine were subsequently analyzed. Acute toxicity tests based on the criteria of immobilization were performed on egg-carrying… Show more

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Cited by 27 publications
(10 citation statements)
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“…Behavioral markers can now be rigorously quantified in experiments that can be replicated and thus are powerful tools to complement other traditional survival analyses. New developments of analytical methods of behaviors, such as image analysis (Friberg-Jensen et al 2010) and video-tracking of locomotor patterns (Denoël et al 2010;Winandy and Denoël 2011), but also analyses of more complex aspects of behaviors such as sensory perception (Mandrillon and Saglio 2007) and learning processes (Eddins et al 2010), are encouraged because of the complex and often overlooked actions of chemicals. Going in-depth with such techniques would also put behavioral assessment closer to physiological, histological and molecular studies in explaining the mechanisms of toxicity and the action of chemicals at very low concentrations.…”
Section: Concentrationsmentioning
confidence: 99%
“…Behavioral markers can now be rigorously quantified in experiments that can be replicated and thus are powerful tools to complement other traditional survival analyses. New developments of analytical methods of behaviors, such as image analysis (Friberg-Jensen et al 2010) and video-tracking of locomotor patterns (Denoël et al 2010;Winandy and Denoël 2011), but also analyses of more complex aspects of behaviors such as sensory perception (Mandrillon and Saglio 2007) and learning processes (Eddins et al 2010), are encouraged because of the complex and often overlooked actions of chemicals. Going in-depth with such techniques would also put behavioral assessment closer to physiological, histological and molecular studies in explaining the mechanisms of toxicity and the action of chemicals at very low concentrations.…”
Section: Concentrationsmentioning
confidence: 99%
“…Despite this evidence of important indirect effects of fungicides, there is a lack of toxicity data on how chronic fungicide exposure may directly affect macroinvertebrates. The question is especially relevant for commonly applied fungicides such as azoxystrobin that appear to show toxicity to invertebrates at low concentrations .…”
Section: Introductionmentioning
confidence: 99%
“…Several studies have demonstrated adverse effects of azoxystrobin on nontarget aquatic invertebrates. Although the mode of action of these effects in invertebrates is unknown, azoxystrobin appears to change the rate of physiological processes such as respiration, heart rate, and limb movements in the cladoceran Daphnia magna . These alterations have the potential to affect energy metabolism and individual fitness, thereby influencing population vital rates.…”
Section: Introductionmentioning
confidence: 99%
“…decanted so that only a representative sample of the soluble fraction of the pesticide was used. Runoff water samples collected after the simulated rain (day 10) were centrifuged (20 min at 2422 Â g) at room temperature for suspended solids removal so that they would not interfere with the cladoceran feeding (Friberg-Jensen et al, 2010). The supernatant was collected and deep frozen at À 20 1C to inhibit bacterial growth until used (Gao et al, 2006).…”
Section: Water Samples and Aquatic Ecotoxicity Evaluationmentioning
confidence: 99%
“…Unexpectedly, runoff resulting from the Control SWS scenario caused high mortality of D. magna in the 48 and 72-h exposure assays at the 100% concentration simulating the 2RD (see Section 3.3). However, given that Control SWS elutriate samples were also prepared by centrifugation to remove excess suspended soil particles and showed negligible mortality (see Section 3.3), a negative effect due to the suspended solids originated from the natural soil towards D. magna may be dismissed as the cause of this additional stress (Friberg-Jensen et al, 2010). Possibly, the deep freezing of the runoff samples for approximately one week was not enough to control the presence of bacteria and fungi originated mainly from the top soil and thus expected in higher amounts in runoff than in elutriates or leachates (Gao et al, 2006).…”
Section: Maize Crop Scenario-aquatic Biota and Water Compartmentmentioning
confidence: 99%