Tuesday 8th September was the meeting of the Gårdsjön foundation. Because several of the DAEMONS sampling sites are within the Gårdsjön catchment, Filip attended to present an overview of the project and results so far. The preliminary data show distinct patterns between the four land uses (forest, lake, agriculture, mire), and some degree of consistency within each land use grouping. One clear finding is that the small percentage of agricultural land within the entire Anråse catchment appears to be responsible for a large proportion of phosphorus export. Phosphorus concentrations at the outflow of the Anråse catchment then appear to be a mix of the inputs from the three tributary rivers Rördalsån, Lerån, and Porsån. Of course, these early findings may not hold true for the duration of the project as more sampling takes place and more data are generated, but it’s certainly an encouraging start. The Gårdsjön foundation has been organising scientific meetings, so-called Gårdsjökonferens, held periodically in Stenungsund. Our new DAEMONS results inspired the discussion on organising the next (8th) meeting in spring 2022. The conference theme “From source to the sea” has been discussed, which would fit perfectly for presenting the future DAEMONS results at the meeting. Figure showing box plots of total phosphorus concentration for streams in different land uses (agriculture, forest, mire), lakes, and the four rivers.
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