Summary
A monitoring program for bulbous rush (Juncus bulbosus) was initiated in 2014, with the aim of finding factors that influence the growth of bulbous rush. The focus of the project in 2016 has been to continue the monitoring and further develop the program. The results from 2016 show no statistically significant changes in the amount of bulbous rush from 2014 to 2016, neither at nuisance nor reference sites. Looking at single sites, there was a clear shift in growth in Drangsholt, where the total volume of plants increased due to a shift from rosette plants to budding rosettes. We found no significant differences in any of the measured parameters (water chemistry, pore water chemistry, water temperature, substrate, other aquatic vegetation and algae) between nuisance and nonnuisance sites, or any correlations with total Juncus bulbosus cover or volume. It is recommended that the current monitoring program continues in 2017 with the sampling and analyzes carried out in 2016, and that thorough statistical tests are initiated.