Figure S1. Increase in the frequency of stickleback with empty stomach (ANOVA, F1, 17 = 11.7, P = 0.003).

Table S1. Data from annual reports of the Akita Prefectural Department of Fisheries.

Table S2. Change in female standard length in the Lake Towada population collected on the western side of the lake.

Table S3. Stomach content analysis.

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