Trait-based predation suitability offers insight into effects of changing prey communities.

Furthermore, functional diversity FDis had a highly significant and positive effect on food suitability (lm, p < 0.0001, ad. r 2 = 0.53) of sampled prey communities ( Fig. 4B ).

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Functional diversity—food suitability relationship The development of functional diversity of prey communities, calculated as FDis, showed an increasing trend over time, with a significant effect of year (GLMM, p < 0.001), displaying highest FDis-values and lowest within year variation in the two recent sample occasions (2000 and 2013), indicating a higher functionally diversity compared to the early 1970s and 1980s ( Fig. 4A ).

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bjoerkna showed a negative trend until after 2000 and only becomes positive in 2013 while not being significantly different from the suitability measure in 1973 at any point in time ( Fig. 3 ).

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