Figure 4
From: Functional genomics of acclimation and adaptation in response to thermal stress in Daphnia
Principal components analysis of differential expression of 29,212 genes represented on the array in 4 clones of Daphnia from Northern (open symbols) and Southern (solid symbols) acclimated to either 18°C (blue symbols) or 28°C (red symbols). A: RNA samples in the 3D space of the first three principal components, together explaining 42.2% of variance. B – D: the same on pairwise 2D planes of the first three principal components. Arrows connect the Euclidean centroids of 3 replicates for each clone at each temperature (thin blue-red gradient arrows) or the centroids of all replicates at each of the two temperatures (thick blue-red gradient arrows) or at each of the two geographic origins (N vs. S, white-black gradient arrows).