A5043292167- Pesticide and Herbicide Environmental Studies
- Environmental Toxicology and Ecotoxicology
- Aquatic Ecosystems and Phytoplankton Dynamics
- Environmental Conservation and Management
- Botany and Plant Ecology Studies
- Peatlands and Wetlands Ecology
- Pesticide Residue Analysis and Safety
- Soil and Water Nutrient Dynamics
- Coastal wetland ecosystem dynamics
- Ecology and Vegetation Dynamics Studies
- Environmental Chemistry and Analysis
- Energy, Environment, Agriculture Analysis
- Pharmaceutical and Antibiotic Environmental Impacts
- Biological Control of Invasive Species
- Forest Insect Ecology and Management
- Aquatic Invertebrate Ecology and Behavior
- Agricultural safety and regulations
- Weed Control and Herbicide Applications
- Diatoms and Algae Research
- Water Quality Monitoring and Analysis
- Freshwater macroinvertebrate diversity and ecology
- Forest Ecology and Biodiversity Studies
- Environmental Science and Water Management
- Marine and coastal ecosystems
- Insect and Pesticide Research
Wageningen University & Research
2012-2024
Altera (United States)
2017
Utrecht University
2008
Radboud University Nijmegen
1983-1990
Fungicides are indispensable to global food security and their use is forecasted intensify. can reach aquatic ecosystems occur in surface water bodies agricultural catchments throughout the entire growing season due frequent, prophylactic application. However, comparison herbicides insecticides, exposure effects of fungicides have received less attention. We provide an overview risk covering fungicide (i.e., environmental fate, modeling, mitigation measures) as well direct indirect on...
Abstract This discussion paper presents a framework for spatiotemporal differentiation in ecological protection goals to assess the risks of pesticides surface waters. It also provides proposal harmonize different scientific approaches ecotoxicological effect assessment adopted guidance documents that support legislative directives European Union (Water Framework Directive and Uniform Principles). Decision schemes derive maximum permissible concentrations water are presented. These based on...
In many aquatic ecosystems, free-floating plants compete with submerged for nutrients and light. Being on top of the water surface are superior competitors Submerged can take up from sediment column, hereby reducing these levels plants. Global warming may change chances successful species invasion alter dominance. We studied combined effects nutrient loading increased temperature competition between potentially invasive Salvinia natans (L.) All. naturalized Elodea nuttallii Planch. St. John...
Summary Dominance of free‐floating plants such as duckweed is undesirable it indicates eutrophication. The objectives this study are to investigate whether the onset dominance related weather conditions by analysing field observations, evaluate effect different climate scenarios on timing using a model and what extent nutrient levels should be lowered counteract effects global warming. To analyse in relation conditions, cover D utch ditches was correlated with for period 1980–2005....
SUMMARY. Considerable changes in macrophyte vegetation can be noticed 146 originally soft waters, when data on the recent aquatic are compared with historical information from period 1900–60. Changes nutrient status (N, P and C) accumulation of organic material regarded as operative factors. The processes observed waters acidification, eutrophication water hardening. Which process dominates depends type water. Acidification well bodies may ultimately result total disappearance all...
1. Experimental studies have indicated in freshwater ecosystems that a shift dominance from submerged to free-floating macrophytes may occur with climate change because of increased water surface temperatures and eutrophication. Field evidence is, however, rare. 2. Here, we analysed long-term (26 years) dynamics macrophyte cover Dutch ditches relation weather variables the North Atlantic Oscillation (NAO) winter index. The latter appears be good proxy for conditions. 3. Cover both evergreen...
The fate and effects of the pyrethroid insecticide lambda-cyhalothrin were compared in mesotrophic (macrophyte-dominated) eutrophic (phytoplankton-dominated) ditch microcosms (approximately 0.5 m3). Lambda-cyhalothrin was applied three times at one-week intervals concentrations 10, 25, 50, 100, 250 ng/L. rate dissipation water column two types test systems similar. After 1 d, only 30% amount remained phase. Initial, direct observed primarily on arthropod taxa. most sensitive species phantom...
The fungicide fluazinam, the insecticide lambda-cyhalothrin, and herbicides asulam metamitron were applied to indoor freshwater microcosms (water volume approximately 0.6 m3). treatment regime was based on a realistic application scenario in tulip cultivation. Concentrations of each pesticide equal 0%, 0.2%, 0.5%, 2%, 5% spray drift emission label-recommended rates. Contribution compounds toxicity package established by expressing their concentrations as fractions toxic units. fate water,...
Abstract Outdoor aquatic ditch mesocosms were treated with a range of pesticides to simulate various spray drift rates resulting from typical crop protection program used in the cultivation potatoes The Netherlands. main experimental aims present study provide information on fate and ecological effects into surface water evaluate effectiveness drift‐reduction measures mitigating risks. selected dosage, frequency, timing application based normal agricultural practices potato crop....
1 We related above-ground biomass allocation to light interception by trees and lianas growing in three tropical rain forest stands that were 0.5, 2 3-year-old regeneration stages after slash burn agriculture. Stem height diameter, leaf angle, the vertical distribution of total longevity measured individuals short-lived pioneers (SLP), four later successional species (LS) (L). Daily capture per individual (Φd) was calculated with a canopy model. Mean daily unit area (Φarea), mass (Φleaf...
SUMMARY 1. Historical and recent data on the occurrence of macrophytes in twenty‐eight lentic soft waters The Netherlands are summarized. These were, a few still are, characterized by submerged vegetation isoetid plants. Changes species composition visualized means multivariate analysis shifts species‐spectra. 2. Ordination available shows that pH, alkalinity, acidity, contents heavy metals, dissolved organic matter some important salts nutrients water interstitial strongly related to...
Lemna spp. are the standard test species representing aquatic macrophytes in current risk assessment schemes for herbicides and plant growth regulators European Union North America. At a Society of Environmental Toxicology Chemistry (SETAC) 2008 workshop on Aquatic Macrophyte Risk Assessment Pesticides (AMRAP), Species Sensitivity Distribution (SSD) working group was formed to address uncertainties about sensitivity relative other macrophyte species. For 11 3 fungicides which relevant...
Increased nutrient loading threatens many freshwater ecosystems. Elevated temperatures may increase the sensitivity to eutrophication in these Higher concentrations of possibly toxic reduced nitrogen (NH x ) water layer be expected as production and anaerobic breakdown rates will increase. Apart from temperature, NH its effect on aquatic macrophytes also depend pH light. We examined interactive effects , light Elodea canadensis a full factorial laboratory experiment. Results demonstrate that...
The present study examined the ecological effects of a range chronic exposure concentrations fungicide azoxystrobin in freshwater experimental systems (1270-L outdoor microcosms). Intended and environmentally relevant test were 0 µg active ingredient (a.i.)/L, 0.33 a.i./L, 1 3.3 10 33 kept at constant values. Responses populations community parameters studied. During 42-d period, time-weighted average ranged from 93.5% to 99.3% intended Zooplankton, especially copepods Daphnia longispina...