Integrated submerged aquatic vegetation management in an urban New Zealand river

摘要: A comprehensive overview of the waterway network in Christchurch City, New Zealand, classified reaches three rivers and numerous smaller waterways according to values for which submerged aquatic vegetation should be managed. The priority values; drainage, recreation, fish habitat native plants, were assigned Council’s historical information on river with regard comments they receive from general public. classification recognised that plants have positive negative effects range supports, these can prioritised. In selected basis their value-based classification, field trials modified management options designed establish seasonal growth patterns implications a reduced level maintenance. Results involved harvesting central strip deeper Avon River, leaving macrophyte either bank, selective removal Potamogeton crispus by hand raking shallower areas, showed considerable interannual variability species dominance. This has timing frequency harvesting. long term aim is optimise competing values, minimise maintenance costs are based more understanding characteristics plant river.