Ralf Schulz

Summary

Affiliation: Syngenta Central Toxicology Laboratory
Country: UK

Publications

  1. ncbi request reprint Inhibition of rainbow trout acetylcholinesterase by aqueous and suspended particle-associated organophosphorous insecticides
    Armin Sturm
    Institute of Aquaculture, University of Stirling, Stirling FK9 4LA, UK
    Chemosphere 68:605-12. 2007
  2. ncbi request reprint Acute toxicity of methyl-parathion in wetland mesocosms: assessing the influence of aquatic plants using laboratory testing with Hyalella azteca
    R Schulz
    USDA Agricultural Research Service, National Sedimentation Laboratory, P O Box 1157, Oxford, Mississippi 38655, USA
    Arch Environ Contam Toxicol 45:331-6. 2003
  3. ncbi request reprint Methyl parathion toxicity in vegetated and nonvegetated wetland mesocosms
    Ralf Schulz
    U S Department of Agriculture Agricultural Research Service, National Sedimentation Laboratory, PO Box 1157, Oxford, Mississippi 38655, USA
    Environ Toxicol Chem 22:1262-8. 2003
  4. ncbi request reprint Fate and effects of azinphos-methyl in a flow through wetland in South Africa
    Ralf Schulz
    Department of Zoology, Private Bag X1, University of Stellenbosch, Matieland 7602, South Africa
    Environ Sci Technol 37:2139-44. 2003
  5. ncbi request reprint Using a freshwater amphipod in situ bioassay as a sensitive tool to detect pesticide effects in the field
    Ralf Schulz
    Department of Zoology, University of Stellenbosch, Private Bag XI, Matieland 7602, South Africa
    Environ Toxicol Chem 22:1172-6. 2003
  6. ncbi request reprint Vegetated agricultural drainage ditches for the mitigation of pyrethroid-associated runoff
    Erin R Bennett
    US Department of Agriculture, Agricultural Research Service National Sedimentation Laboratory, Oxford, Mississippi 38655, USA
    Environ Toxicol Chem 24:2121-7. 2005
  7. doi request reprint Seasonal changes of macroinvertebrate communities in a Western cape river, South Africa, receiving nonpoint-source insecticide pollution
    Silke Bollmohr
    Department of Zoology, University of Stellenbosch, Matieland 7602, South Africa
    Environ Toxicol Chem 28:809-17. 2009
  8. ncbi request reprint Runoff simulation with particle-associated azinphosmethyl in multispecies stream microcosms: implications for the field
    Geraldine Thiere
    Department of Zoology, University of Stellenbosch, Matieland 7602, South Africa
    Environ Toxicol Chem 23:1984-90. 2004
  9. ncbi request reprint Runoff-related agricultural impact in relation to macroinvertebrate communities of the Lourens River, South Africa
    Geraldine Thiere
    Department of Zoology, University of Stellenbosch, South Africa
    Water Res 38:3092-102. 2004
  10. ncbi request reprint Predicted and measured levels of azinphosmethyl in the Lourens River, South Africa: comparison of runoff and spray drift
    James M Dabrowski
    Freshwater Research Unit, Department of Zoology, University of Cape Town, Rondebosch 7701, South Africa
    Environ Toxicol Chem 22:494-500. 2003

Collaborators

Detail Information

Publications24

  1. ncbi request reprint Inhibition of rainbow trout acetylcholinesterase by aqueous and suspended particle-associated organophosphorous insecticides
    Armin Sturm
    Institute of Aquaculture, University of Stirling, Stirling FK9 4LA, UK
    Chemosphere 68:605-12. 2007
    ..14microgl(-1)) were minor compared to concentrations having effects in the laboratory (see above). Additionally, muscle AChE activity was significantly higher in caged trout from LR1 than in animals maintained in laboratory tanks...
  2. ncbi request reprint Acute toxicity of methyl-parathion in wetland mesocosms: assessing the influence of aquatic plants using laboratory testing with Hyalella azteca
    R Schulz
    USDA Agricultural Research Service, National Sedimentation Laboratory, P O Box 1157, Oxford, Mississippi 38655, USA
    Arch Environ Contam Toxicol 45:331-6. 2003
    ..azteca mortality to < or = 5%. These results suggest that vegetation contributes to reduced MeP effects in constructed wetlands...
  3. ncbi request reprint Methyl parathion toxicity in vegetated and nonvegetated wetland mesocosms
    Ralf Schulz
    U S Department of Agriculture Agricultural Research Service, National Sedimentation Laboratory, PO Box 1157, Oxford, Mississippi 38655, USA
    Environ Toxicol Chem 22:1262-8. 2003
    ..The in situ bioassay employing C. tentans confirmed the positive effect of wetland vegetation on MeP toxicity. These results demonstrate the importance of vegetation for pesticide mitigation in constructed wetlands...
  4. ncbi request reprint Fate and effects of azinphos-methyl in a flow through wetland in South Africa
    Ralf Schulz
    Department of Zoology, Private Bag X1, University of Stellenbosch, Matieland 7602, South Africa
    Environ Sci Technol 37:2139-44. 2003
    ..The study highlights the potential of constructed wetlands as a risk-mitigation strategy for spray drift-related pesticide pollution...
  5. ncbi request reprint Using a freshwater amphipod in situ bioassay as a sensitive tool to detect pesticide effects in the field
    Ralf Schulz
    Department of Zoology, University of Stellenbosch, Private Bag XI, Matieland 7602, South Africa
    Environ Toxicol Chem 22:1172-6. 2003
    ....
  6. ncbi request reprint Vegetated agricultural drainage ditches for the mitigation of pyrethroid-associated runoff
    Erin R Bennett
    US Department of Agriculture, Agricultural Research Service National Sedimentation Laboratory, Oxford, Mississippi 38655, USA
    Environ Toxicol Chem 24:2121-7. 2005
    ..Overall results of this study illustrate that aquatic macrophytes play an important role in the retention and distribution of pyrethroids in vegetated agricultural drainage ditches...
  7. doi request reprint Seasonal changes of macroinvertebrate communities in a Western cape river, South Africa, receiving nonpoint-source insecticide pollution
    Silke Bollmohr
    Department of Zoology, University of Stellenbosch, Matieland 7602, South Africa
    Environ Toxicol Chem 28:809-17. 2009
    ....
  8. ncbi request reprint Runoff simulation with particle-associated azinphosmethyl in multispecies stream microcosms: implications for the field
    Geraldine Thiere
    Department of Zoology, University of Stellenbosch, Matieland 7602, South Africa
    Environ Toxicol Chem 23:1984-90. 2004
    ....
  9. ncbi request reprint Runoff-related agricultural impact in relation to macroinvertebrate communities of the Lourens River, South Africa
    Geraldine Thiere
    Department of Zoology, University of Stellenbosch, South Africa
    Water Res 38:3092-102. 2004
    ..9). It is concluded that the Lourens River macroinvertebrate communities are affected by agricultural pollution, with pesticides and increased turbidity as the most important stressors...
  10. ncbi request reprint Predicted and measured levels of azinphosmethyl in the Lourens River, South Africa: comparison of runoff and spray drift
    James M Dabrowski
    Freshwater Research Unit, Department of Zoology, University of Cape Town, Rondebosch 7701, South Africa
    Environ Toxicol Chem 22:494-500. 2003
    ....
  11. ncbi request reprint Combined effects of discharge, turbidity, and pesticides on mayfly behavior: experimental evaluation of spray-drift and runoff scenarios
    James M Dabrowski
    Freshwater Research Unit, Department of Zoology, University of Cape Town, Rondebosch 7701, South Africa
    Environ Toxicol Chem 24:1395-402. 2005
    ..Results indicate that mayflies reacted actively in response to flow conditions and passively in response to pesticide exposure...
  12. ncbi request reprint A combined microcosm and field approach to evaluate the aquatic toxicity of azinphosmethyl to stream communities
    Ralf Schulz
    Department of Zoology, University of Stellenbosch, Matieland, South Africa
    Environ Toxicol Chem 21:2172-8. 2002
    ..We conclude that microcosm studies employing a field-relevant design could be linked successfully to field studies and our results suggest that transient pesticide contamination affects the aquatic communities of the Lourens River...
  13. ncbi request reprint Predicting runoff-induced pesticide input in agricultural sub-catchment surface waters: linking catchment variables and contamination
    James M Dabrowski
    Department of Zoology, University of Stellenbosch, Matieland, South Africa
    Water Res 36:4975-84. 2002
    ..We conclude that this approach to predict runoff-related surface water contamination may serve as a powerful tool for risk assessment and management in South African orchard areas...
  14. ncbi request reprint Ecdysteroid synthesis and imaginal disc development in the midge Chironomus riparius as biomarkers for endocrine effects of tributyltin
    Torsten Hahn
    Zoological Institute, Technical University of Braunschweig, Germany
    Environ Toxicol Chem 21:1052-7. 2002
    ..riparius at levels 2,000-fold below the LC50 value. High sensitivity and short test duration suggest that chironomids may have potential as freshwater sentinel organisms for endocrine-disrupting chemicals...
  15. ncbi request reprint Scenario-based simulation of runoff-related pesticide entries into small streams on a landscape level
    Michael Probst
    Institute for Environmental Sciences, University Koblenz Landau, Fortstrasse 7, D 76829 Landau, Germany
    Ecotoxicol Environ Saf 62:145-59. 2005
    ..All input data was taken from public sources of German authorities. With little effort the tool should be applicable for other areas with similar data quality...
  16. ncbi request reprint A comparison of predicted and measured levels of runoff-related pesticide concentrations in small lowland streams on a landscape level
    Norbert Berenzen
    Group Limnology Ecotoxicology, Zoological Institute of the Technical University Braunschweig, Fasanenstr 3, 38092 Braunschweig, Germany
    Chemosphere 58:683-91. 2005
    ..71; p<or=0.01; tebuconazole: r2=0.77; p<or=0.01. The present model successfully explains the pesticide concentrations associated with single entry events caused by runoff, especially at concentration levels above (>or=0.5 microg/l)...
  17. ncbi request reprint Linking land use variables and invertebrate taxon richness in small and medium-sized agricultural streams on a landscape level
    Michael Probst
    Department of Limnology and Ecotoxicology, Zoological Institute of the Technical University Braunschweig, Fasanenstr 3, Braunschweig 38092, Germany
    Ecotoxicol Environ Saf 60:140-6. 2005
    ..Therefore the factor "risk of runoff" is considered to express a significant proportion of the variability in macroinvertebrate communities caused by stressors of agricultural origin...
  18. ncbi request reprint Macroinvertebrate community structure in agricultural streams: impact of runoff-related pesticide contamination
    Norbert Berenzen
    Zoological Institute of the Technical University Braunschweig, Limnology Ecotoxicology, Fasanenstr 3, 38092 Braunschweig, Germany
    Ecotoxicol Environ Saf 60:37-46. 2005
    ..01 x acute toxicity to Daphnia and are thus in agreement with the assumptions underlying the standards set by the European Union uniform principle...
  19. ncbi request reprint Field studies on exposure, effects, and risk mitigation of aquatic nonpoint-source insecticide pollution: a review
    Ralf Schulz
    Zoological Institute, Technical University, Fasanenstrasse 3, D 38092 Braunschweig, Germany
    J Environ Qual 33:419-48. 2004
    ..Although only 11 studies are available, the results in terms of pesticide retention and toxicity reduction are very promising. Based on the reviewed literature, recommendations are made for future research activities...
  20. ncbi request reprint A qualitative sampling method for monitoring water quality in temporary channels or point sources and its application to pesticide contamination
    Michael Neumann
    Department of Limnology, Zoological Institute, Technical University Braunschweig, Fasanenstrasse 3, D 38092 Braunschweig, Germany
    Chemosphere 51:509-13. 2003
    ..We found parathion-ethyl concentrations of 0.3 microg l(-1), diuron up to 17.3 microg l(-1), ethofumesate up to 51.1 microg l(-1), metamitron up to 92 microg l(-1) and prosulfocarb up to 130 microg l(-1)...
  21. ncbi request reprint The significance of entry routes as point and non-point sources of pesticides in small streams
    Michael Neumann
    Department of Limnology, Zoological Institute, Technical University Braunschweig, Germany
    Water Res 36:835-42. 2002
    ..In comparison, stream B had only farmyard runoff and non-point sources, which caused high peaks of herbicide and a contamination by insecticides. Consequently, high-water phases generated 70% of the total pesticide load...
  22. ncbi request reprint Test-plot studies on runoff of sulfonamides from manured soils after sprinkler irrigation
    Robert Kreuzig
    Institute of Ecological Chemistry and Waste Analysis, Technical University of Braunschweig, D 38106 Braunschweig, Germany
    Environ Toxicol Chem 24:777-81. 2005
    ..Discharge volumes and sulfonamide emissions were 36 to 128 L and 0.1 to 2.5%, respectively. Despite the high-intensity sprinkler irrigation, major emissions did not occur until a 60-min delay...
  23. ncbi request reprint Environmental chemicals with known endocrine potential affect yolk protein content in the aquatic insect Chironomus riparius
    Torsten Hahn
    Zoologisches Institut der TU Braunschweig, AG Limnologie Okotoxikologie, Germany
    Environ Pollut 120:525-8. 2002
    ..Female yolk protein contents were affected only in the 3,000 microg bisphenol a/l contaminated group, where yolk immunoreactivity was reduced by ca. 10% compared to the control...
  24. ncbi request reprint In situ-based effects measures: determining the ecological relevance of measured responses
    Donald J Baird
    National Water Research Institute Environment Canada at Canadian Rivers Institute, Department of Biology, University of New Brunswick, PO Box 45111, Fredericton, New Brunswick E3B 6E1, Canada
    Integr Environ Assess Manag 3:259-67. 2007
    ..The use of models as both interpretive and predictive tools is discussed, with suggestions of appropriate methods for different protection goals...