Effects of a Pulsed Treatment With the Herbicide Afalon (Active Ingredient Linuron) on Macrophyte-Dominated Mesocosms. I. Responses of Ecosystem Metabolism

Kersting, Kees; Wijngaarden, R.P.A. van

doi:10.1897/1551-5028(1999)018<2859:eoaptw>2.3.co;2

Cited by 7 publications

(26 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Most mesocosm studies investigating effects of herbicides have shown a decrease of photosynthetic activity in combination with a decrease in dissolved oxygen as a result of their impact on macrophytes and phytoplankton (e.g., Kersting and Van Wijngaarden [16]). This indicates an increased photosynthetic activity on these days despite a decline in chlorophyll a concentration and phytoplankton abundance.…”

Section: Discussionmentioning

confidence: 99%

An assessment of direct and indirect effects of two herbicides on aquatic communities

Hasenbein

Lawler

Connon

2017

Environmental Toxicology and Chemistry

View full text Add to dashboard Cite

Herbicides are often detected in watersheds at concentrations that are toxic to phytoplankton, potentially causing indirect effects on higher trophic organisms. The long-term effects of 5 applications over 30 d of binary mixtures of the herbicides diuron and hexazinone were assessed at "low" and "high" concentrations typically found in the environment, using mesocosms. Sixteen of 95 phytoplankton taxa, 3 of 18 zooplankton taxa, and 6 of 14 macroinvertebrate taxa responded negatively to contaminant exposures. Herbicide applications altered the phytoplankton community structure. Relative abundance of Cyanophyceae decreased following 5 applications from 52.1% in the control to 37.3% in the low treatment and to 25.9% in the high treatment, while Chlorophyceae increased to 50.6% in the low treatment and to 61.7% in the high treatment compared with the control (39.7%). Chlorophyceae had the greatest number of affected species (8), whereas 1 species within the Cyanophyceae was negatively affected on more than 1 sampling day. Further, chlorophyll a was reduced on 4 and 5 d out of the 8 total sampling days in the low and high treatments, respectively, compared with the control. These results highlight that integrating multiple taxa and contaminants with long-term exposures in ecological risk assessments of herbicides can facilitate the ability to make predictive and mechanistic generalizations about the role of herbicides in shaping patterns of species abundance in natural systems. Environ Toxicol Chem 2017;36:2234-2244. © 2017 SETAC.

show abstract

Section: Discussionmentioning

confidence: 99%

An assessment of direct and indirect effects of two herbicides on aquatic communities

Hasenbein

Lawler

Connon

2017

Environmental Toxicology and Chemistry

View full text Add to dashboard Cite

show abstract

“…These expectations were based on results of a previous experiment with linuron [1,2]. However, expected direct effects can lead to less predictable indirect effects on, for example, the animal community [2,3]. We therefore studied flo‐ristic and faunal endpoints.…”

Section: Introductionmentioning

confidence: 99%

Effects of a pulsed treatment with the herbicide afalon (active ingredient linuron) on macrophyte‐dominated mesocosms. II. Structural responses

Geest

Zwaardemaker

Wijngaarden

et al. 1999

Enviro Toxic and Chemistry

View full text Add to dashboard Cite

Abstract-Outdoor mesocosms (experimental drainage ditches) were treated repeatedly with linuron at nominal concentrations of 0, 0.5, 5, 15, and 50 g/L. After each of three treatments (with 4-week intervals), the systems were kept static for 1 week. Subsequently, they were flushed with nonpolluted surface water with a residence time of 5 d until the next treatment. Species composition and abundance of macrophytes, periphyton, phytoplankton, zooplankton, and macroinvertebrates were examined at prefixed time intervals. During the treatment periods, significant decreases in oxygen concentration and pH were observed, whereas the systems recovered during the flushing periods. The effects of the pulsed treatments on the structural endpoints (biota) were rarely significant and consistently were difficult to interpret. We conclude that under these experimental conditions, pulsed treatment with linuron causes only minor and negligible effects on the abundance of organisms in mesocosms, even when maximum permissible concentrations are exceeded by about 80 times. Risk assessment based on the more sensitive physiologic and functional endpoints suggested that the safety factor of 0.1 times the acute EC50 of the most sensitive standard alga (Scenedesmus acutus), as adopted in the Uniform Principles of the European Union, is sufficient to protect the community of the mesocosms in an exposure regime that was realistic for Dutch drainage ditches, using a photosynthesis inhibitor as the benchmark compound.

show abstract

“…The answer has been demonstrated to be conclusively no by Kersting and Van Wijngaarden [12] using a very different multispecies system. The answer has been demonstrated to be conclusively no by Kersting and Van Wijngaarden [12] using a very different multispecies system.…”

Section: Persistence Of Effectsmentioning

confidence: 99%

“…Kersting and Van Wijngaarden [12] and Van Geest et al [33] discuss the relative importance of these measures in a series of herbicide mesocosm experiments. Functional variables are those measures that describe the metabolism of an ecological system.…”

Section: Introductionmentioning

confidence: 99%

Persistence of the Effects of Jet-a in a Microcosm With Releases From the Sediment

Sandberg

Landis

2001

Environ Toxicol Chem

View full text Add to dashboard Cite

This study investigates both the methods and the multispecies and functional level effects of a release of a complex hydrocarbon mixture from sediments using a 60-d modified mixed flask culture (MFC) microcosm. Neat Jet-A was injected and mixed into the sediment with one nondosed and three dosed concentrations. Univariate and multivariate statistical and graphical techniques were used to detect patterns in the data. A slow release of the test material from the spiked sediment layer was obtained, and constituents of Jet-A were detected. Functional parameters (such as pH) were generally better at determining treatment groups than structural parameters (population densities). Analysis of the ability of the various parameters to detect treatment differences confirms that there is not one best indicator for the status of an ecological structure. Transient but statistically significant outcomes were seen at initial treatment concentrations as low as 2 microl/L. The higher concentration treatment groups could be identified as distinguished from nondosed or lower treatments at the end of the 63-d experiment. Each of the three multivariate techniques differed in their ability to distinguish treatment groups during the course of the experiment.

show abstract

Effects of a Pulsed Treatment With the Herbicide Afalon (Active Ingredient Linuron) on Macrophyte-Dominated Mesocosms. I. Responses of Ecosystem Metabolism

Cited by 7 publications

References 19 publications

An assessment of direct and indirect effects of two herbicides on aquatic communities

An assessment of direct and indirect effects of two herbicides on aquatic communities

Effects of a pulsed treatment with the herbicide afalon (active ingredient linuron) on macrophyte‐dominated mesocosms. II. Structural responses

Persistence of the Effects of Jet-a in a Microcosm With Releases From the Sediment

Contact Info

Product

Resources

About