This plot (called a heatmap) is essentially a table with genes as rows and populations as columns. Genes (rows) are arranged in such a way that genes with the most similar expression profile across populations are next to each other (clustered together, see the cluster dendrogram on the right; populations (columns) are arranged in such a way that two populations with the most similar expression profile are next to each other (see cluster dendrogram on top). Each cell of the table is painted by a scale of colors from red to black to green; red means that this gene is up-regulated (transcribed at a higher rate) in this population, relative to overall mean, green means that this gene is down-regulated in this population.
You can see a clear 2 clusters of genes: up-regulated in the North Basin and upregulated in Maloe More. Maloe More is also the highest fat content samples by far. We plan to sequence more samples from each region.
NB: North Baikal station 2, MM – Maloe More station 2, CB: Central Baikal station 2, SB: South Baikal station 2.