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Influence of submerged aquatic vegetation on the fate and food web transfer of pesticides in small freshwater ecosystems
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM). (Environmental modelling of contaminants)
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM). (Environmental modelling of contaminants)
Stockholm University, Faculty of Science, Department of Applied Environmental Science (ITM). (Environmental modelling of contaminants)
2009 (English)In: Chemosphere, ISSN 0045-6535Article in journal (Refereed) Submitted
Abstract [en]

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
2009.
Keyword [en]
Macrophytes, pesticide, fate, exposure, dynamic model, bioaccumulation
Research subject
Applied Environmental Science
Identifiers
URN: urn:nbn:se:su:diva-26398OAI: oai:DiVA.org:su-26398DiVA: diva2:209317
Available from: 2009-03-26 Created: 2009-03-24 Last updated: 2009-03-26Bibliographically approved
In thesis
1. Tools for Evaluating the Fate and Bioaccumulation of Organic Compounds in Aquatic Ecosystems
Open this publication in new window or tab >>Tools for Evaluating the Fate and Bioaccumulation of Organic Compounds in Aquatic Ecosystems
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The bioaccumulation of organic contaminants in aquatic ecosystems has been a key focus in environmental toxicology over the last decades. Bioaccumulation is a key concept in ecological risk assessments since it controls the internal dose of potential environmental contaminants. Information on the bioaccumulation of contaminants is used by regulatory authorities in the development of water quality standards, categorizing substances that are potential hazards and quantifying the risk of chemicals to human health. A basis for identifying priority chemicals has been the use of the octanol-water partition coefficient (KOW) as a criterion to estimate bioaccumulation potential. However, recognizing that the bioaccumulation process is not controlled by the hydrophobicity of a chemical alone, this thesis proposes a set of tools, incorporating chemical properties, environmental characteristics and physiological properties of organisms, to study the bioaccumulation of contaminants in aquatic ecosystems.

 In striving to achieve this objective, a tool based on an equilibrium lipid partitioning approach was used in Paper I to evaluate monitoring data for bioaccumulation of organic contaminants. In Papers II and III, mechanistic based modelling tools were developed to describe bioaccumulation of hydrophobic compounds in aquatic food webs. In Paper IV, the bioaccumulation of organic compounds in aquatic food chains was studied using stable isotopes of nitrogen. The mechanistic fate and food web models developed in this thesis provide regulators and chemical manufacturers with a means of communicating scientific information to the general public and readily applicable mechanistic fate and food web models that are easily modified for evaluative assessments purposes.

Place, publisher, year, edition, pages
Stockholm: Department of Applied Environmental Science (ITM), Stockholm University, 2009. 59 p.
Keyword
Baltic Sea, Biomagnification, Exposure, Food web, Fugacity model, Stable isotopes, Organic contaminants
National Category
Natural Sciences
Research subject
Applied Environmental Science
Identifiers
urn:nbn:se:su:diva-26383 (URN)978-91-7155-814-5 (ISBN)
Public defence
2009-04-24, Nordenskiöldsalen, Geovetenskapens hus, Svante Arrhenius väg 8 C, Stockholm, 10:00 (English)
Opponent
Supervisors
Available from: 2009-04-02 Created: 2009-03-23 Last updated: 2009-04-21Bibliographically approved

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