In 2018 and 2019 high school students across Denmark went to over 90 lakes and carried out field work. They noted down important lake characteristics and collected eDNA samples which they subsequently analysed in the laboratories at the Natural History Museum of Denmark. They looked for the presence of amphibians and fish in the lakes. That data is now being analysed to characterise the preferred environments of each species, community composition and the effect of lake size of species richness.
Left: Map of sampling sites in 2018 (light green) and 2019 (dark green), created using Google MyMaps. Upper right: Hyla arborea by RobertC1301, CC-BY-SA at pl.wikipedia. Lower right: Bufo bufo by Armin Kübelbeck, CC-BY-SA, Wikimedia Commons