Ralf Schulz

Summary

Affiliation: Technical University of Braunschweig
Country: Germany

Publications

  1. doi 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
  2. ncbi A qualitative field method for monitoring pesticides in the edge-of-field runoff
    R Schulz
    Department of Limnology, Technical University Braunschweig
    Chemosphere 36:3071-82. 1998
  3. ncbi 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
  4. ncbi 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
  5. ncbi Combined effects of predatory fish and sublethal pesticide contamination on the behavior and mortality of mayfly nymphs
    R Schulz
    Department of Zoology, University of Stellenbosch, Matieland, South Africa
    Environ Toxicol Chem 20:2537-43. 2001
  6. ncbi Comparison of spray drift- and runoff-related input of azinphos-methyl and endosulfan from fruit orchards into the Lourens River, South Africa
    R Schulz
    Department of Zoology, University of Stellenbosch, Matieland, South Africa
    Chemosphere 45:543-51. 2001
  7. ncbi Acute and chronic effects of particle-associated fenvalerate on stream macroinvertebrates: a runoff simulation study using outdoor microcosms
    R Schulz
    Zoological Institute, Technical University, Braunschweig, Germany
    Arch Environ Contam Toxicol 40:481-8. 2001
  8. ncbi Spray deposition of two insecticides into surface waters in a South African orchard area
    R Schulz
    Dep of Zoology, Univ of Stellenbosch, South Africa
    J Environ Qual 30:814-22. 2001
  9. ncbi Toxicity of aqueous-phase and suspended particle-associated fenvalerate: chronic effects after pulse-dosed exposure of Limnephilus lunatus (Trichoptera)
    R Schulz
    Zoological Institute, Technical University, Fasanenstrasse 3, D 38092 Braunschweig, Germany
    Environ Toxicol Chem 20:185-90. 2001
  10. ncbi Effectiveness of a constructed wetland for retention of nonpoint-source pesticide pollution in the Lourens River catchment, South Africa
    R Schulz
    Department of Zoology, University of Stellenbosch, Matieland, South Africa
    Environ Sci Technol 35:422-6. 2001

Collaborators

Detail Information

Publications33

  1. doi 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
    ....
  2. ncbi A qualitative field method for monitoring pesticides in the edge-of-field runoff
    R Schulz
    Department of Limnology, Technical University Braunschweig
    Chemosphere 36:3071-82. 1998
    ..On about 80% of the occasions the presence or absence of runoff measured in the field was in agreement with a simulation of runoff presence or absence using the runoff model KINEROS...
  3. ncbi 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...
  4. ncbi 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...
  5. ncbi Combined effects of predatory fish and sublethal pesticide contamination on the behavior and mortality of mayfly nymphs
    R Schulz
    Department of Zoology, University of Stellenbosch, Matieland, South Africa
    Environ Toxicol Chem 20:2537-43. 2001
    ..We conclude that the drift response of mayflies to transient sublethal pesticide exposure results in a synergistically increased adverse effect in the presence of predatory fish...
  6. ncbi Comparison of spray drift- and runoff-related input of azinphos-methyl and endosulfan from fruit orchards into the Lourens River, South Africa
    R Schulz
    Department of Zoology, University of Stellenbosch, Matieland, South Africa
    Chemosphere 45:543-51. 2001
    ..A probability analysis based on pesticide application patterns and 10-yr rainfall data indicates that the frequencies of rainfall events > or = 10 and > or = 15 mm/d are 3.4 and 1.7 per spraying season, respectively...
  7. ncbi Acute and chronic effects of particle-associated fenvalerate on stream macroinvertebrates: a runoff simulation study using outdoor microcosms
    R Schulz
    Zoological Institute, Technical University, Braunschweig, Germany
    Arch Environ Contam Toxicol 40:481-8. 2001
    ..This study highlights the ecotoxicological importance and bioavailability of field-relevant levels of particle-associated hydrophobic chemicals transiently introduced into surface waters during runoff events...
  8. ncbi Spray deposition of two insecticides into surface waters in a South African orchard area
    R Schulz
    Dep of Zoology, Univ of Stellenbosch, South Africa
    J Environ Qual 30:814-22. 2001
    ..01)...
  9. ncbi Toxicity of aqueous-phase and suspended particle-associated fenvalerate: chronic effects after pulse-dosed exposure of Limnephilus lunatus (Trichoptera)
    R Schulz
    Zoological Institute, Technical University, Fasanenstrasse 3, D 38092 Braunschweig, Germany
    Environ Toxicol Chem 20:185-90. 2001
    ..Results from this study suggest that short-term FV contamination at expected, field-relevant levels may lead to long-term effects even if the chemical is associated with suspended particles...
  10. ncbi Effectiveness of a constructed wetland for retention of nonpoint-source pesticide pollution in the Lourens River catchment, South Africa
    R Schulz
    Department of Zoology, University of Stellenbosch, Matieland, South Africa
    Environ Sci Technol 35:422-6. 2001
    ..A toxicological evaluation employing a Chironomus bioassay in situ at the wetland inlet and outlet revealed an 89% reduction in toxicity below the wetland during runoff...
  11. ncbi Runoff simulation with particle-bound fenvalerate in multispecies stream microcosms: importance of biological interactions
    R Schulz
    Zoological Institute, Technical University, Braunschweig, Germany
    Environ Toxicol Chem 20:757-62. 2001
    ..Interspecific and intraspecific interactions can alter the test results; i.e., significant lethal and sublethal effects are measurable at FV levels approximately an order of magnitude lower than when biological interactions are excluded...
  12. ncbi Rainfall-induced sediment and pesticide input from orchards into the Lourens River, Western Cape, South Africa: importance of a single event
    R Schulz
    Department of Zoology, University of Stellenbosch, Matieland 7602, South Africa
    Water Res 35:1869-76. 2001
    ..A probability analysis of 10-y rainfall data revealed that the frequency of a similar storm event occurring within the main spraying season is 1.7 y-1...
  13. ncbi Toxicity of fenvalerate to caddisfly larvae: chronic effects of 1- vs 10-h pulse-exposure with constant doses
    R Schulz
    Zoological Institute, Technical University, Braunschweig, Germany
    Chemosphere 41:1511-7. 2000
    ..1 microg l(-1), temporal pattern of emergence at 0.001 microg l(-1), dry weight of adults at 0.01 microg l(-1)...
  14. ncbi 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
    ....
  15. ncbi 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...
  16. ncbi 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
    ....
  17. ncbi 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
    ....
  18. ncbi 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...
  19. ncbi 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...
  20. ncbi 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 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...
  22. ncbi 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...
  23. ncbi 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...
  24. ncbi 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...
  25. ncbi 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...
  26. ncbi 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...
  27. ncbi 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)...
  28. ncbi 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...
  29. ncbi 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...
  30. ncbi 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...
  31. ncbi 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...
  32. ncbi 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...
  33. ncbi 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...