Functional redundancy and food web functioning in linuron-exposed ecosystems

F. De Laender, P.J. Van Den Brink, C.R. Janssen

Résultats de recherche: Contribution à un journal/une revueArticle

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Résumé

An extensive data set describing effects of the herbicide linuron on macrophyte-dominated microcosms was analysed with a food web model to assess effects on ecosystem functioning. We showed that sensitive phytoplankton and periphyton groups in the diets of heterotrophs were gradually replaced by more tolerant phytoplankton species as linuron concentrations increased. This diet shift - showing redundancy among phytoplankton species - allowed heterotrophs to maintain their functions in the contaminated microcosms. On an ecosystem level, total gross primary production was up to hundred times lower in the treated microcosms but the uptake of dissolved organic carbon by bacteria and mixotrophs was less sensitive. Food web efficiency was not consistently lower in the treated microcosms. We conclude that linuron predominantly affected the macrophytes but did not alter the overall functioning of the surrounding planktonic food web. Therefore, a risk assessment that protects macrophyte growth also protects the functioning of macrophyte-dominated microcosms.
langue originaleAnglais
Pages (de - à)3009-3017
Nombre de pages9
journalEnvironmental Pollution
Volume159
Numéro de publication10
Les DOIs
étatPublié - 1 oct. 2011
Modification externeOui

Empreinte digitale

Linuron
Phytoplankton
Functional Food
Food Chain
Ecosystems
Ecosystem
Redundancy
Nutrition
Diet
Herbicides
Organic carbon
Risk assessment
Bacteria
Carbon
Growth

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De Laender, F. ; Van Den Brink, P.J. ; Janssen, C.R. / Functional redundancy and food web functioning in linuron-exposed ecosystems. Dans: Environmental Pollution. 2011 ; Vol 159, Numéro 10. p. 3009-3017.
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Functional redundancy and food web functioning in linuron-exposed ecosystems. / De Laender, F.; Van Den Brink, P.J.; Janssen, C.R.

Dans: Environmental Pollution, Vol 159, Numéro 10, 01.10.2011, p. 3009-3017.

Résultats de recherche: Contribution à un journal/une revueArticle

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