Influence of submerged aquatic vegetation on the fate and food web transfer of pesticides in small freshwater ecosystems
2009 (English)In: Chemosphere, ISSN 0045-6535Article in journal (Refereed) Submitted
A dynamic combined fate and food web model was developed to investigate the influence of macrophytes (submerged aquatic vegetation) on the fate and food web transfer of pesticides of varying chemical properties in small-scale ecosystems such as ponds, streams, ditches or mesocosms. The model results indicate that aquatic macrophytes have a significant effect on the fate and food web transfer of highly hydrophobic compounds with log KOW ≥ 5. Modelled peak concentrations in biota were highest for the scenarios assuming the lowest macrophytes biomass density. The distribution and food web transfer of compounds with log KOW ≤ 4, which is a more representative hydrophobicity of the majority of current-use pesticides, are not affected by the inclusion of aquatic macrophytes in the pond environment. The increased importance of macrophytes for the highly hydrophobic compounds is a result of the dominance of particle deposition in the mass transfer of organic compounds from water to macrophytes. It is recommended that the mechanistic model developed here be used as a tool for interpreting laboratory, mesocosm and field measurements as well as a possible higher-tier regulatory tool, especially for assessing the aquatic behaviour of pesticides with high KOW values.
Place, publisher, year, edition, pages
Macrophytes, pesticide, fate, exposure, dynamic model, bioaccumulation
Research subject Applied Environmental Science
IdentifiersURN: urn:nbn:se:su:diva-26398OAI: oai:DiVA.org:su-26398DiVA: diva2:209317