Elevated nutrients coming from a sewage treatment works in the Upper Mun is thought to be limiting stream invertebrate biodiversity and polluting a lake downstream. The restoration will divert the stream water through a series of shallow plant-filled lakes so that the excessive nutrients coming from the sewage treatment works are converted to plant biomass, thus providing a filtering system. Stream habitat will also be diversified using LWD (large woody debris) and through the creation of backwater habitat. These new features will provide areas for slack water-associated organisms, while also increasing water velocity in localised areas adjacent to the LWD structures affording habitats for fast water dwelling species. Using a BACI monitoring design similar to The River Nar project , ENSIS aim to assess ecological response to the restoration
Objectives: The purpose of the project is to determine:
Methods: ENSIS surveyed river invertebrates including a control site and downstream of the Froghall STW (treatment site). One sampling run was carried out prior to completion of the river restoration work, and one afterwards (September 2014). Invertebrate surveys were quantitative, allowing the assessment of compositional change, density and biomass. ENSIS carried out species identification and data analysis.
Results/Conclusions This project is ongoing