Figure 2

Habitat change frequency over time. Cumulative proportion of individuals changing habitat type between sampling events (blue), and the proportion of individuals opting for non-preferred habitat types (red dashed line; habitat types with occurrence of individuals in less than 15% of all cases) in backswimmers (Notonecta glauca, N. obliqua), and diving beetles (Dytiscus marginalis, Acilius sulcatus). Additional lines were included to visualize the total densities of individuals (both sexes) occurring in the most preferred habitat type = dotted line (PH; backswimmers: fishless habitats with submersed and floating macrophytes; diving beetles: the sum of individuals found in all preferred habitats).