APPENDIX FIGURE LEGENDS:
FIGURE A1: Example of a frame extracted from videos to
measure shell length. The snail is in the center of a 9 cm-petri
dish.
FIGURE A2: Generic shell length function by
geographic distribution and genetic composition. White boxes represent
shell lengths. The bottom and top of the box are the
25th and 75th percentiles, the
dashed vertical lines show the 50th percentiles, and
the ends of the whiskers represent the minimum and maximum estimates.Outliers are represented by black dots beyond the
whiskers.