Zooplankton consumption by whitefish and sticklebacks. Seasonal zooplankton consumption (A) and Chesson’s prey selectivity index from May 2017 to January 2018 (B). Lines with black squares represent average zooplankton density (N/m3) in the lake (depth: 0–60 m). The period in which our samples contained both fish species is delimited by dashed vertical lines. Zooplankton is ordered from the smallest to the largest species. Chesson’s Index values above and below the red line (a = 1/m) represent preference and avoidance, respectively, for each zooplankton species over the compared period.