Figure S1 Body size distributions for riverine and generalist species found in Atlantic and Pacific drainages.

Figure S2 The moments of regional size distributions show clear latitudinal trends.

Figure S3 Riverine species assemblages with apparently bimodal regional body size distributions.

Figure S4 Regional size–frequency distributions within the Mississippi catchment: migratory species are shown in grey.

Figure S5 Regional variation in the mean length and skewness of all species and non-endemic species as a function of latitude.

Table S1 Analysis of covariance F statistics from comparison of observed and simulated maximum and minimum size – latitude trends for resident and migratory species.

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