Limnological surveys of Welsh lakes: Llyn Helyg, Llyn Bedydd and Pant-yr-ochain pools, Clwyd

This report, commissioned by the Countryside Council for Wales (CCW), presents the data from the study of three lake sites in Clwyd, North Wales. Lake physical characteristics, water chemistry and aquatic macrophytes were recorded at Llyn Helyg (SJ 115774), Llyn Bedydd (SJ 471392) and Pant-yr-ochain Pools (SJ 348533). All results presented here, except those for water chemistry, are based on one-off sampling and surveys in July 2000. Recognized experts verified Charophyte and Ranunculus specimens from Llyn Helyg. Water samples were collected on four occasions (July 2000, Nov 2000, Feb 2001 and May 2001). Samples for TP, SRP, NO3 and Chl a were frozen on site and analysed at the CEH laboratories, Penicuik

The United Kingdom Acid Waters Monitoring Network Data Report for 2005-2006 (year 18)

The UK Acid Waters Monitoring Network (UKAWMN) has been operating continuously since 1988. During the first ten years biological and chemical data were summarised in an annual series of printed reports From the year 2000 annual data reports have also been available from the UKAWMN web page. These are of a similar format to earlier annual reports but focus on graphical representations of time trends in raw data and diagnostic statistics (e.g. species richness and diversity indices). Detailed analysis of data is presented in two interpretative reports, Monteith (2005) and Monteith and Evans (2000) dealing with 15 and 10 years of accumulated results respectively. Both are also available on the UKAWMN web page. A full description of sampling methods and analytical procedures, together with site descriptions, are also presented on the UKAWMN web page

Aquatic Macrophyte Change in the UK Upland Waters Monitoring Network

Established in 1988, the UK Upland Waters Monitoring Network (UKUWMN) was initiated by the UK Government to monitor the effects of emission control legislation on the water chemistry and biodiversity of 22 lakes and streams across the UK. Since monitoring commenced, the water chemistry of most sites has shown clear signs of recovery (e.g. rising pH and declining labile aluminium concentrations). Aquatic plants are a key component of freshwater biodiversity, but their response to changes in water acidity have received much less attention than other biological groups such as fish or macroinvertebrates. Project-specific standardised plant survey methodologies have been used throughout the time-series, and these have been augmented by Water Framework Directive Common Standards Monitoring Methodology survey techniques at lake sites since 2009, and at stream sites since 2019. The current study aims to determine the extent to which these stream and lake plant communities may have responded to regional reductions in aquatic acidity and to what degree any recovery may be confounded by other drivers such as climate-related changes in water temperature, hydrology, flow and storminess, hydromorphology and additionally the changing light climate/ice cover environment in lakes. A second aim is to examine the preservation and scientific potential of plant DNA in lakes for reconstructing past aquatic plant assemblages by comparing the current water sample eDNA, annual sediment trap sedDNA and sediment core sedDNA records with the known biomonitoring records

UK Upland Waters Monitoring Network (UKUWMN) Llyn Llagi, Llyn Cwm Mynach, Afon Hafren and Afon Gwy Annual Summary Progress Report April 2016 - March 2017

The funded chemical and biological sample collection, analysis and data collation, quality control and archiving proceeded without any problems at Llyn Llagi during the period from April 2016 to March 2017. In February 2017 the outflow logger and stageboard were removed pending building works for a National Trust micro-hydro scheme at the site. Subsequently plans for the scheme were withdrawn and it is hoped that the equipment can be reinstalled at the original location

Land-use experiments in the Loch Laidon Catchment. Eighth report on Stream Water Quality to the Rannoch Trust

This report presents the results from the Stream Water Quality component of the Loch Laidon catchment land-use experiment which began in 1992. The experiment was set up to examine the effects of cattle grazing on the aquatic and terrestrial habitats and biota of a moorland area of upland Scotland

UK Upland Waters Monitoring Network (UKUWMN) - Contract 22 01 249 Llyn Llagi, Llyn Cwm Mynach, Afon Hafren and Afon Gwy Annual Summary Progress Report April 2014 - March 2015

Chemical and biological sample collection, analysis and data collation, quality control and archiving proceeded without any problems at Llyn Llagi during the period from April 2014 to March 2015. Sponge samples from the site, collected in 2012 and sent off to Karen Evans, a PhD student at Liverpool University, were identified as being of two species, Spongilla lacustris and Racekiela ryderii

Land-use experiments in the Loch Laidon Catchment: 2007 data report on Stream Water Quality to the Rannoch Trust

In 1992 the Rannoch Trust established the Loch Laidon catchment land-use experiment, which is investigating the effects of summer cattle grazing on the terrestrial and aquatic upland environment. Situated in Perthshire, Scotland, the study area falls within a number of designations, including the Rannoch Moor Special Area of Conservation and Site of Special Scientific Interest, the Rannoch Lochs Special Protection Area and the Tayside Local Biodiversity Action Plan

Land-use experiments in the Loch Laidon catchment: sixth report on stream water quality to the Rannoch Trust

This report presents and summarises data from the Stream Water Quality project instigated by the Rannoch Trust in 1992. The project is a component of the Loch Laidon Catchment land-use experiment, which is investigating the effects of differing cattle grazing regimes on the terrestrial and aquatic upland environment. Allott et al (1994) described the project rationale and background whilst progress reports (see References) have provided ongoing updates of the accumulating dataset