Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 414064
Title Functional redundancy and food web functioning in linuron-exposed ecosystems
Author(s) Laender, F. De; Brink, P.J. van den; Janssen, C.R.
Source Environmental Pollution 159 (2011)10. - ISSN 0269-7491 - p. 3009 - 3017.
Department(s) Alterra - Centre for Water and Climate
CWC - Environmental Risk Assessment
Aquatic Ecology and Water Quality Management
Publication type Refereed Article in a scientific journal
Publication year 2011
Keyword(s) fresh-water microcosms - herbicide linuron - phytoplankton - responses - dynamics - growth - methodology - communities - sensitivity - metabolism
Abstract 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.
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