MITIGATION OF MALATHION'S ACUTE TOXICITY BY FOUR SUBMERSED MACROPHYTE SPECIES
Identifieur interne : 007001 ( Main/Merge ); précédent : 007000; suivant : 007002MITIGATION OF MALATHION'S ACUTE TOXICITY BY FOUR SUBMERSED MACROPHYTE SPECIES
Auteurs : William R. Iii Brogan [États-Unis] ; Rick A. Relyea [États-Unis]Source :
- Environmental toxicology and chemistry [ 0730-7268 ] ; 2013.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Plante aquatique, Insecticide.
English descriptors
- KwdEn :
Abstract
Some submersed macrophyte species rapidly sorb some insecticides from the water, potentially reducing exposure for aquatic species. The rates at which macrophytes remove insecticides, however, can differ widely among plant species. Furthermore, few studies have examined how much macrophytes actually influence insecticide toxicity to sensitive animals. The authors quantified the ability of several macrophyte species to mitigate insecticide toxicity by comparing the survival of the aquatic herbivore, Daphnia magna, following exposure to a factorial combination of 3 malathion concentrations (0 μg/L, 3 μg/L, and 24 μg/L) and 7 macrophyte treatments (no macrophytes, 4 different macrophyte monocultures, and 2 inert substrates: plastic plants and polypropylene rope). The authors also quantified the rate that different macrophytes reduced malathion's toxicity by exposing D. magna to water samples collected from each treatment after 2 h, 8 h, and 48 h of exposure. The results revealed that whereas 3 μg/L and 24 μg/L of malathion decimated D. magna in the no-macrophyte, plastic plant, and rope treatments, all 4 macrophyte species strongly mitigated these effects. When the authors compared the rate at which malathion's toxicity decreased, they found that all macrophytes negated malathion's toxicity within 2 h, whereas it took more than 8 h in the absence of macrophytes or in the presence of inert substrates. These results demonstrate that numerous macrophyte species can equally and strongly mitigate insecticide toxicity, whereas inert substrates cannot.
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Acute</term>
<term>Aquatic plant</term>
<term>Ecotoxicology</term>
<term>Insecticide</term>
<term>Interaction</term>
<term>Malathion</term>
<term>Mitigation measure</term>
<term>Phytoremediation</term>
<term>Toxicity</term>
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<keywords scheme="Pascal" xml:lang="fr"><term>Malathion</term>
<term>Aigu</term>
<term>Toxicité</term>
<term>Plante aquatique</term>
<term>Phytoremédiation</term>
<term>Interaction</term>
<term>Ecotoxicologie</term>
<term>Insecticide</term>
<term>Mesure d'atténuation</term>
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<front><div type="abstract" xml:lang="en">Some submersed macrophyte species rapidly sorb some insecticides from the water, potentially reducing exposure for aquatic species. The rates at which macrophytes remove insecticides, however, can differ widely among plant species. Furthermore, few studies have examined how much macrophytes actually influence insecticide toxicity to sensitive animals. The authors quantified the ability of several macrophyte species to mitigate insecticide toxicity by comparing the survival of the aquatic herbivore, Daphnia magna, following exposure to a factorial combination of 3 malathion concentrations (0 μg/L, 3 μg/L, and 24 μg/L) and 7 macrophyte treatments (no macrophytes, 4 different macrophyte monocultures, and 2 inert substrates: plastic plants and polypropylene rope). The authors also quantified the rate that different macrophytes reduced malathion's toxicity by exposing D. magna to water samples collected from each treatment after 2 h, 8 h, and 48 h of exposure. The results revealed that whereas 3 μg/L and 24 μg/L of malathion decimated D. magna in the no-macrophyte, plastic plant, and rope treatments, all 4 macrophyte species strongly mitigated these effects. When the authors compared the rate at which malathion's toxicity decreased, they found that all macrophytes negated malathion's toxicity within 2 h, whereas it took more than 8 h in the absence of macrophytes or in the presence of inert substrates. These results demonstrate that numerous macrophyte species can equally and strongly mitigate insecticide toxicity, whereas inert substrates cannot.</div>
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