Study

Effects of mooring management on submerged vegetation, sediments and macro-invertebrates in Lake Constance, Germany

  • Published source details Ostendorp W., Gretler T., Mainberger M., Peintinger M. & Schmieder K. (2009) Effects of mooring management on submerged vegetation, sediments and macro-invertebrates in Lake Constance, Germany. Wetlands Ecology and Management, 17, 525-541.

Summary

Action: Use alternative mooring structures to minimize impacts on vegetation

A replicated, site comparison study in 2005 in a freshwater lake in southern Germany (Ostendorp et al. 2009) found that ‘hook buoys’ with chains adjusted weekly to the water level had a smaller zone of disturbance than conventional buoys with fixed-length chains, but that macrophyte richness and cover within this zone did not significantly differ between buoy types. The zone disturbed by the buoy chain was smaller around hook buoys (6 m2) than around conventional buoys (87 m2). However, submerged macrophyte richness and cover in this zone were statistically similar around both buoy types (3.7 species/zone and 10% cover, averaged across buoy types). Methods: In July 2005, submerged macrophytes were visually surveyed (by divers) around 12 buoys in Lake Constance: six hook buoys and six conventional buoys. The water depth at the buoys fluctuates seasonally (annual range 0.9–2.8 m). Macrophytes were surveyed within the zone disturbed by each buoy chain.

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