RPS undertook Condition Assessments of 11 lakes located throughout Wales based on their aquatic macrophyte flora and use this information to determine their Biodiversity Action Plan interest.
The survey methodology employed was developed under the auspices of the Joint Nature Conservation Committee (JNCC), the organisation responsible for maintaining ‘Common Standards’ for site condition monitoring across the UK. Other information was gathered including, collecting water samples and bathymetric data of the lake and mapping the aquatic macrophyte vegetation of the water body. This was then analysed and evaluated to assess the Biodiversity importance of each water body based on the SSSI selection criteria for standing water.
There was a wide range of lakes covering oligotrophic, mesotrophic and eutrophic standing water. They all varied in importance with some lakes recommended for special status and others were of low biodiversity Importance. Factors such as invasive plants, over-fishing and potential eutrophication were all significant threats to the biodiversity of the lakes.