... Waste Water - Evaluation and Management 222 We have also undertaken chemical and biological measurements in streams, lakes and wetlands over the years. Elemental composition ... algae, macrophytes and macroinvertebrates have also been recorded in streams and wetlands. Cover, biomass and productivity measurements of phytoplankton, submerged-, emergent- and pleustonic vegetation ... ecosystems, including rivers and wetlands and waste water treatment facilities as well, we will also report unpublished data. Chemical oxygen demand, total nitrogen and total phosphorus contents...