NDLI: Effects of photosystem II inhibitors and their mixture on freshwater phytoplankton succession in outdoor mesocosms

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Effects of photosystem II inhibitors and their mixture on freshwater phytoplankton succession in outdoor mesocosms

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Effects of photosystem II inhibitors and their mixture on freshwater phytoplankton succession in outdoor mesocosms

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Knauert, Stefanie Dawo, Ursula Hollender, Juliane Hommen, Udo Knauer, Katja
Description	Country affiliation: Switzerland Author Affiliation: Knauert S ( Department of Environmental Sciences, University of Basel, Hebelstrasse 1, 4056 Basel, Switzerland. stefanie.knauert@unibas.ch)
Abstract	Effects of three photosystem II inhibitors and of their mixture on a freshwater phytoplankton community were studied in outdoor mesocosms. Atrazine, isoproturon, and diuron were applied as 30% hazardous concentrations (HC30s) obtained from species-sensitivity distributions. Taking concentration addition into account, the mixture comprised one-third of the HC30 of each substance. Effects were investigated during a five-week period of constant concentrations and a five-month posttreatment period when the herbicides dissipated. Total abundance, species composition, and diversity and recovery of the community were evaluated. Ordination techniques, such as principal component analysis and principal response curve, were applied to compare the various treatments on the community level. The three herbicides stimulated comparable effects on total abundance and diversity of phytoplankton during the period of constant exposure because of the susceptibility of the dominant cryptophytes Chroomonas acuta and Cryptomonas erosa et ovata and the prasinophyte Nephroselmis cf. olivacea. Moreover, concentration addition described combined effects of atrazine, isoproturon, and diuron on total abundance and diversity in the constant-exposure period, because their mixture induced effects on abundance and diversity similar to those of the single substances. Principal component and principal response curve analyses revealed that the community structure of diuron- and isoproturon-treated phytoplankton recovered two weeks after constant exposure, which might be related to the fast dissipation of the phenylureas. Species compositions of mixture-and atrazine-treated communities were not comparable to that of the control community five months after the end of constant exposure. This might be explained by the slower dissipation of atrazine relative to the phenylureas and by differences in the species sensitivities, resulting in a different succession of phytoplankton.
File Format	HTM / HTML
ISSN	07307268
Issue Number	4
Volume Number	28
e-ISSN	15528618
Journal	Environmental Toxicology and Chemistry
Language	English
Publisher	Wiley
Publisher Date	2009-04-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Research Support, Non-u.s. Gov't Toxicity Discipline Environmental Health Discipline Toxicology Phenylurea Compounds Biodiversity Antagonists & Inhibitors Journal Article Time Factors Ecosystem Discipline Chemistry Phytoplankton Fresh Water Physiology Diuron Drug Effects Cryptophyta Reproducibility Of Results Chemistry Animals Analysis Toxicity Tests Photosystem Ii Protein Complex Atrazine Population Dynamics
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Health, Toxicology and Mutagenesis

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Co-tolerance of phytoplankton communities to photosynthesis II inhibitors.

Phytotoxicity of atrazine, isoproturon, and diuron to submersed macrophytes in outdoor mesocosms.

Detection of photosynthetic herbicides: algal growth inhibition test vs. electrochemical photosystem II biosensor.

The effect of temperature and a herbicide mixture on freshwater periphytic algae.

Mixture toxicity from photosystem II inhibitors on microalgal community succession is predictable by concentration addition.

Effects of pulsed atrazine exposures on autotrophic community structure, biomass, and production in field-based stream mesocosms.

Assessing sensitivity and recovery of field-collected periphyton acutely exposed to atrazine using PSII inhibition under laboratory conditions.

Hazard and risk of herbicides for marine microalgae.

Atrazine does not affect algal biomass or snail populations in microcosm communities at environmentally relevant concentrations.

Effects of photosystem II inhibitors and their mixture on freshwater phytoplankton succession in outdoor mesocosms

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Effects of photosystem II inhibitors and their mixture on freshwater phytoplankton succession in outdoor mesocosms