title: Effects of dinoseb on energy reserves in the soil arthropod Folsomia candida.
abstract: This study evaluated the usefulness of energy reserves as an early warning system in Folsomia candida when exposed to the pesticide dinoseb. After different exposure times, survival, reproduction, growth (weight and length), lipid and protein content of the organisms were determined. After six days of exposure at 15-30microg of dinoseb/g dry soil, the weight, lipid, and protein content of the exposed organisms were higher than the controls. This stimulation seems to indicate that Collembola adopt a strategy of increasing their growth in order to improve their reproduction. This hypothesis was confirmed by the number of eggs laid which was greater in exposed organisms. After 21 days, all measured parameters decreased. The results show that after having produced an effort to increase growth and reproduction, lethality increases. The selected energy reserves are not more sensitive than the classically measured parameters such as reproduction, but can be more predictive for a pollutant stress encountered by the organisms.
authors.affiliation: Ecole Polytechnique Fédérale de Lausanne, ENAC-ISTE, Laboratory of Environmental Chemistry and Ecotoxicology, Station 2, CH-1015 Lausanne, Switzerland.
authors.forename: Carine
authors.initials: C
authors.lastname: Staempfli
authors.forename: Joseph
authors.initials: J
authors.lastname: Tarradellas
authors.forename: Kristin
authors.initials: K
authors.lastname: Becker-van Slooten
mesh_terms: D019297:2,4-Dinitrophenol / Q000031:analogs & derivatives* / Q000633:toxicity; D000818:Animals; D001181:Arthropods / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism; D049628:Body Size / Q000187:drug effects; D001835:Body Weight / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D004734:Energy Metabolism / Q000187:drug effects*; D004784:Environmental Monitoring / Q000379:methods*; D007928:Lethal Dose 50; D050356:Lipid Metabolism / Q000187:drug effects; D010575:Pesticides / Q000633:toxicity*; D011506:Proteins / Q000378:metabolism; D015203:Reproducibility of Results; D012098:Reproduction / Q000187:drug effects; D012989:Soil Pollutants / Q000633:toxicity*; D013997:Time Factors
chemical_list: D010575:Pesticides; D011506:Proteins; D012989:Soil Pollutants; D019297:2,4-Dinitrophenol; C018527:dinoseb