Fig. 4
From: Salmonid sensory system development is affected by climate change driven temperature increases
Ontogenetic increase in canal or superficial neuromast number is not significantly different among temperature treatments (ANCOVA with Tukey Contrasts, p > 0.05; data derived from vital fluorescent staining). (A) Canal neuromast (CN) number increases linearly with fish size (standard length, mm SL) prior to canal enclosure; a breaking point (arrows, with 95% confidence) occurs at 21.2–23.7 mm SL, 22.0–24.9 mm SL, and 21.1–24.4 mm SL, at + 4 (red), + 2 (yellow), + 0 °C (blue [ambient]), respectively, indicating that number ceases to increase after these points (best-fit linear regression with segmented relationships; see Materials and Methods and S1 for more details). (B) Superficial neuromast (SN) number increases linearly with fish size throughout ontogeny (best-fit linear regression parameters reported in text and S1). Note differences in y-axis values for CNs and SNs, indicating that SNs become more numerous than CNs in individuals of comparable sizes.
