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Fig. 1

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Study area: Lake Dres (Gran Paradiso National Park, Western Italian Alps) and surrounding aquatic habitats. Water flows in SE-NW direction. Fish eradication involved Lake Dres and the river sections between B1 and B2 (which are waterfalls acting as barriers for upstream fish movements). Fish are naturally absent above B1 and still present downstream B2, which prevent their reinvasion; neither the pond NE of Lake Dres was colonized by brook trout nor was the intermittent river section below it.

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