Figure 2
From: Parallel developmental genetic features underlie stickleback gill raker evolution
Marine/freshwater differences in gill raker number and spacing are specified early in development. (A-C) Ventral row 1 developing gill raker buds, stained for cartilage (Alcian blue) and bone (Alizarin red). Scale bar = 25 um. Fish total length is indicated in bottom left. (D, E) Time course of lab-reared mean row 1 ventral raker number (D) or left side row 1 ventral raker spacing (E) vs. total length of fish. Red = Little Campbell marine (LITC), light blue = Paxton benthic freshwater (PAXB), dark blue = Fishtrap Creek freshwater (FTC).