In our first blog we briefly mentioned the monthly water sampling program. This is the core fieldwork behind DAEMONS. Twelve waterbodies are sampled which cover the different land uses in the area (identified as key end members), and the four main rivers within the catchment are also sampled. In this blog we thought we’d give a tour of the sampling sites in virtual form so readers can get a feel for the area. The main catchment is that of the Anråse river. Within this are the three subcatchments of the rivers Rördalsån, Lerån, and Porsån. First up we have three headwater lakes: Stora Hästevatten North, Gaffeln and Svallesjön. Stora Hästevatten North and Gaffeln are both in the well-studied Gårdsjön catchment, which then drains into the Rördalsån. Svallesjön drains into the Lerån. Next we have three headwater streams draining forests: one each for each subcatchment. The forest stream that drains into the Rördalsån is named F1. A nondescript name, but aficionados of research into acidification may recognise it as the reference stream for the famous Gårdsjön roof experiment, where a huge plastic roof was used to cover the G1 subcatchment and prevent rain and throughfall (and therefore acid deposition) from reaching the ground. Two of the mire streams are in the Rördalsån subcatchment, and the third is in the Porsån subcatchment. There’s certainly no shortage of mires in the catchment, and so here we were rather spoiled for choice. In contrast to mire streams, finding headwater streams with a dominant agricultural influence was difficult, as most of the land is forest. One of the agricultural streams is in the Lerån subcatchment, whilst the two others are downstream of the confluence where the Rördalsån, Lerån, and Porsån meet and form the Anråse river. Finally, we have the three rivers of the subcatchments, and then a sampling site in the Anråse river just above the tidal limit before it flows into the Hake Fjord.
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