Modeling responses of Daphnia magna to pesticide pulse exposure under varying food conditions: intrinsic versus apparent sensitivity.
Cast your vote
You can rate an item by clicking the amount of stars they wish to award to this item.
When enough users have cast their vote on this item, the average rating will also be shown.
Your vote was cast
Thank you for your feedback
Thank you for your feedback
MetadataShow full item record
TitleModeling responses of Daphnia magna to pesticide pulse exposure under varying food conditions: intrinsic versus apparent sensitivity.
PubliekssamenvattingRecent studies showed that limiting food conditions resulted in either increased or decreased sensitivity of Daphnia magna to toxicants. It remained unclear whether these contrasting food-dependent alterations in toxicity resulted from differences in intrinsic sensitivity of the daphnids or from changes in toxicokinetics and resource allocation. It is hypothesized here that, if food level only affects accumulation kinetics and resource allocation, then the intrinsic sensitivity to this toxicant should be the same for all food regimes. This hypothesis was investigated using the DEBtox model, which is based on the theory of Dynamic Energy Budgets. We examined results of two recently conducted life-cycle studies on the combined effects of food level and a pulsed exposure to the pyrethroid insecticide fenvalerate (FV) on D. magna. The model described the effects of the time-varying exposure well, and indicated that when the animals did not die from exposure to FV, full reversibility of toxic effects was possible, allowing a complete recovery. Results revealed furthermore that the data from both studies could be described by the same NECs for survival and assimilation, killing rate and tolerance concentration (132 (49.2-228) x 10(-6) mug/L, 0 (0-1.18 x 10(-5)) mug/L, 74.4 (55.6-96.4) L (mug d)(-1) and 5.39 (2.72-18.5) x 10(-3) mug/L, respectively). It is therefore concluded that food-dependent FV toxicity can be explained by altered toxicokinetics and resource allocation, but not by changes in the intrinsic sensitivity of the daphnids. This study implies that the effect of pesticide application in the field depends on the trophic state of the receiving water body, but also that full recovery of survivors is possible after FV application.
- Influence of food limitation on the effects of fenvalerate pulse exposure on the life history and population growth rate of Daphnia magna.
- Authors: Pieters BJ, Paschke A, Reynaldi S, Kraak MH, Admiraal W, Liess M
- Issue date: 2005 Sep
- Maternal nutritional state determines the sensitivity of Daphnia magna offspring to short-term Fenvalerate exposure.
- Authors: Pieters BJ, Liess M
- Issue date: 2006 Mar 10
- Pesticide exposure and inducible antipredator responses in the zooplankton grazer, Daphnia magna Straus.
- Authors: Pestana JL, Loureiro S, Baird DJ, Soares AM
- Issue date: 2010 Jan
- Effects of food availability on the acute and chronic toxicity of the insecticide methomyl to Daphnia spp.
- Authors: Pereira JL, Gonçalves F
- Issue date: 2007 Nov 1
- Effects of azithromycin on feeding behavior and nutrition accumulation of Daphnia magna under the different exposure pathways.
- Authors: Li Y, Ma Y, Yang L, Duan S, Zhou F, Chen J, Liu Y, Zhang B
- Issue date: 2020 Jul 1