Fig 1.
Location of the four areas along the Swedish east coast.
The year of first observation of the round goby during the regular fish monitoring program was 2013 in Muskö and Torhamn, 2016 in Mönsterås, and 2018 in Asköfjärden.
Table 1.
Results of the generalized additive mixed model for CPUE of each fish species/functional group. n (number of observations) = 2046 for each fish species/functional group. Only for herring, n = 1191; edf: Effective degrees of freedom.
Fig 2.
Generalized additive mixed model plots showing partial effects of round goby on CPUE of different fish species/functional groups (perch, cyprinids, piscivores, cod, pikeperch, and pike, perch≥ 20 cm total length, and flounder).
Values below zero indicate negative effects of the variable on CPUE. The dotted lines represent the 95% confidence interval. Tick marks on the x-axis indicate the distribution of the observations.
Fig 3.
Generalized additive mixed model plots showing partial effects of round goby on CPUE of different fish species (herring, sprat, whitefish, and ruff).
Values below zero indicate negative effects of the variable on CPUE. The dotted lines represent the 95% confidence interval. Tick marks on the x-axis indicate the distribution of the observations.