Fig 3. Hierarchical clustering of Atlantic salmon gene transcription profiles following juvenile rearing in unenriched and enriched hatchery environments.

The heatmap depicts clustering of all 808 differentially transcribed genes, with the transcription profile of each individual represented by a column in the map. Grey and black color bars located above the columns correspond to individuals reared in unenriched and enriched environments, respectively. Above these bars, each profile is also labeled by family (X11, X22, X35), whether the individual was reared with gravel (G) or without gravel (N), and by individual identification number. For a given gene (i.e. row in heatmap) higher and lower gene transcript abundance, relative to the common reference sample, is indicated in purple and yellow, respectively.