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After conservationists have dug hundreds of new artificial ponds in Aargau (Switzerland), amphibian numbers have increased significantly. In 1999 Aargau decided that a mass conservation effort was needed to combat the loss of amphibians. The collapse of the European tree frog was of particular concern.
State authorities, non-profit organizations, private landowners and hundreds of volunteers worked for 20 years to build 422 ponds in five regions in Aargau.
Over 20 years the regional population of the European tree frog quadrupled in one area. It could only be found at 16 sites in Reusstal in 1999, but by 2019 the species was living in 77 places. The European tree frog population in particular “exploded”, scientists say.
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