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Pulse Effects of Herbicides on Periphyton in Streams and Recovery

Contents

Sammenfatning og konklusioner

Summary and conclusions

1 Introduction

2 Materials and Methods

• 2.1 Achieving the natural populations of epiphytes
• 2.2 Exposure to herbicides
  • 2.2.1 Effect of varying exposure time
  • 2.2.2 Recovery experiment
• 2.3 Calculation of effect concentrations
• 2.4 Pigment analyses

3 Results

• 3.1 Effects of herbicides on the photosynthesis
• 3.2 Recovery
• 3.3 Effect on the algae group composition

4 Discussion

• 4.1 Effects of herbicides on the photosynthesis of epiphyton
• 4.2 Effects of metribuzin on the individual algal groups

5 References

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Version 1.0 October 2005, © Danish Environmental Protection Agency