Short- and long-term responses of Daphnia spp. to propanil exposures in distinct food supply scenarios.
The widespread increase of pesticides application in crops frequently leads to the contamination of vicinal freshwater lentic ecosystems. Herbicides such as propanil may impair cladoceran fitness, which is per se strongly influenced by the food availability and/or its acquisition efficiency. This work intended to evaluate the responses of Daphnia magna and three clonal lineages belonging to the Daphnia longispina complex to acute and chronic exposures of the herbicide propanil, as well as to assess whether food availability features these responses. Results showed that the agrochemical was acutely and chronically toxic to both D. magna and the D. cf. longispina clones at the same range of low concentrations, while relevant differences were depicted between the three distinct genotypes belonging to the D. longispina complex. Food-level conditioned the general fitness of the daphnids in the tests but evidences suggest that it does not interfere specifically with the toxicant mode of action.
Pereira
Joana Luísa
JL
Department of Biology, CESAM-Center for Environmental and Marine Studies, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal. jpereira@bio.ua.pt
Mendes
Cristiana Duarte
CD
Gonçalves
Fernando
F
D000818:Animals; D003621:Daphnia / Q000187:drug effects* / Q000235:genetics / Q000254:growth & development; D004305:Dose-Response Relationship, Drug; D004784:Environmental Monitoring / Q000379:methods*; D005247:Feeding Behavior / Q000187:drug effects; D005298:Fertility / Q000187:drug effects; D005618:Fresh Water; D005838:Genotype; D006540:Herbicides / Q000633:toxicity*; D010641:Phenotype; D011411:Propanil / Q000633:toxicity*; D013045:Species Specificity; D013997:Time Factors; D018675:Toxicity Tests; D014874:Water Pollutants, Chemical / Q000633:toxicity*
D006540:Herbicides; D014874:Water Pollutants, Chemical; D011411:Propanil