Figure 1. Maps of study regions—Northeast (A), West Coast (B), and Eastern Bering Sea (C)—with the continental shelf shaded in blue (300 m cutoff for Northeast and Eastern Bering Sea, 600 m for West Coast). Inset plots show regional minimum (blue), mean (orange), and maximum (red) monthly SST (annual means). Black dashed lines show axes of measurement for range edges in each region, for which the origin point is marked with an X.