Pulse effects of herbicides on periphyton in streams and recovery

27-10-2005During the last decade, it has been documented that pesticides frequently occurred in Danish streams. Generally, published data on effects of herbicides on microalgal communities are lacking. In the present study the herbicides isoproturon, hexazinone and metribuzin affected the microalgea community at low concentration, and at distinctly lower concentration than the effect concentrations published for standard single-species growth-test. A significant result of this study was that even a short-term exposure affected the composition of the periphyton community.Læs publikation