Figure captions
FIGURE 1 Overview of the two studied watercourses Fusta and Drevja. Triangles indicate the position of sampling stations. A double black bar indicates the upstream limit of the treatment of River Fusta in August 2011 and August 2012, and a single black bar indicates the upstream limit of the treatment of the watercourse in October 2012.
FIGURE 2 Mean changes in dissimilarity (% difference) for abundance data (a – c) and for presence-absence data (d – f) between sampling occasions (a and d) and its components; losses (b and e) and gains (c and f). Grey: River Fusta (rotenone treated), black: River Drevjaelva (untreated). Dashed vertical lines indicate the timing of the rotenone treatments. Error bars indicate maximum and minimum values of the temporal biodiversity indices at individual sampling stations. Significant differences in diversity indices between sampling periods (p < 0.05) in River Fusta are marked with grey asterisk (no signifcant differences detected in River Drevjaelva).
FIGURE 3 Average abundance (with standard deviation) of benthic invertebrates of River Fusta (rotenone treated) and River Drevjaelva (untreated) in the period 2011-2016. a) total abundance, b) Epemeroptera, c) Plecoptera, d) Trichoptera, e) Chironomidae and f) Oligochaeta. Timing of rotenone treatments are marked with arrows.
FIGURE 4 Mean changes in dissimilarity (% difference) for abundance data (a – c) and for presence-
absence data (d – f) between sampling occasions (a and d) and its components; losses (b and e) and gains (c and f). grey: Lake Fustvatnet (rotenone treated), black: Lake Drevvatnet (untreated). Dashed vertical lines indicate the timing of the rotenone treatment of the lake. Error bars indicate maximum and minimum values of the temporal biodiversity indices at individual sampling stations.
FIGURE 5 Average abundance (with standard deviation) of benthic invertebrates of Lake Fustvatnet (rotenone treated) and Lake Drevvatnet (untreated) in the period 2011-2016. A) Total abundance, b) Ephemeroptera, c) Plecoptera, d) Trichoptera, e) Chironomidae and f) Oligochaeta. Timing of the rotenone treatment is marked with an arrow.