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Bioavailability of pesticides to benthic invertebrates

the role of aquatic biofilms and humic substances

Lundqvist, Anna (2011). Bioavailability of pesticides to benthic invertebrates. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2011:54
ISBN 978-91-576-7598-9
[Doctoral thesis]

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In agricultural landscapes, pesticides are frequently contaminating nearby aquatic ecosystems. Unlike most other contaminants, pesticides are targeted against specific organism groups, but will also have negative effects on non-target organisms. When pesticides enter aquatic environments they tend to sorb to fine organic matter. Thus, benthic organisms inhabiting sediment and biofilms are constantly exposed to elevated concentrations. Depending on the bioavailability of these contaminants, benthic organisms play a key-role in the uptake and transfer to higher trophic levels. The bioavailability is partly deter-mined by the presence of organic matter, where their quantity and quality reflects the aquatic ecosystem’s trophic status and catchment area features.

The broader aim of this thesis was to study the effects of different organic matter in artificial bottom substrate, and aquatic biofilms on pesticide bio-availability to benthic invertebrates with different feeding behaviour. We used organic matter of different sources, and short-term exposures to mimic peak exposures of pesticides in agricultural aquatic ecosystems.

The results show that sediments with microbial biofilms strongly increase chlorpyrifos bioavailability to selective feeding larvae. However, chlorpyrifos bioavailability showed a negative correlation to extracellular polymeric substances (EPS) and humic substances (HS) quantities in an artificial bottom substrate. Furthermore, uptake of carbofuran, lindane and chlorpyrifos in non-selective feeding snails were affected by dissolved organic matter (DOM) quantity and quality, and related to pesticide hydrophobicity. Also, pesticide fate in microcosm compartments was affected by DOM-quantity and quality depending on pesticide physicochemical characteristics. These results lead on to a study where we wanted to quantify pesticide sorption to molecular size-fractions of different DOM, however, unfortunately without success.

This thesis highlights the importance of quantity and quality of organic matter, based on our high resolution of different organic matter, and their impact on pesticide fate and bioavailability to lower trophic levels in aquatic ecosystems. Consequently, pesticide fate and bioavailability, and thus their effects on biota, changes between aquatic environments, and this should be taken into consideration in tests protocols for pesticide regulations.

Authors/Creators:Lundqvist, Anna
Title:Bioavailability of pesticides to benthic invertebrates
Subtitle:the role of aquatic biofilms and humic substances
Alternative abstract:
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2011
Number of Pages:51
I.Widenfalk, A., Lundqvist, A. & Goedkoop, W. (2008) Sediment microbes and biofilms increase the bioavailability of chlorpyrifos in Chironomus riparius (Chironomidae,Diptera). Ecotoxicology and Environmental Safety 71, 490-497
II.Lundqvist, A., Bertilsson, S. & Goedkoop, W. (2010) Effects of extracellular polymeric and humic substances on chlorpyrifos bioavailability to Chironomus riparius. Ecotoxicology 19, 614-622
III.Lundqvist A., Bertilsson, S. & Goedkoop, W. Fate and bioavailability of insecticides across DOM-gradients in model ecosystems with biofilm and primary consumers (Submitted manuscript)
IV.Lundqvist, A., Tattersdill, K., Jansson, C., Bertilsson, S. & Kylin, H. Model development, endeavouring to study the sorption of insecticides to different size fractions of aquatic humic substances (Manuscript)
Place of Publication:Uppsala
Publisher:Dept. of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences
Associated Programs and Other Stakeholders:SLU - Environmental assessment > Programme Agricultural landscape
SLU - Environmental assessment > Programme Lakes and watercourses
SLU - Environmental assessment > Programme Non-Toxic Environment
ISBN for printed version:978-91-576-7598-9
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:M Aquatic sciences and fisheries > M40 Aquatic ecology
T Pollution > T01 Pollution
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Environmental Sciences (social aspects to be 507)
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
Agrovoc terms:insecticides, bioavailability, biological contamination, benthic environment, invertebrates, neritidae, chironomus riparius, polymers, organic matter, humus, sediment
Keywords:Bioavailability, Pesticides, Dissolved Organic Matter (DOM), Humic Substances, Extracellular Polymeric Substances (EPS), Aquatic Biofilms, Sediment, Benthic Invertebrates
Permanent URL:
ID Code:8141
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
External funders:FORMAS
Deposited By: Anna Lundqvist
Deposited On:19 May 2011 09:14
Metadata Last Modified:02 Dec 2014 10:46

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