Fig. 6.

Principal component analysis (A and B) and Euclidian Dendrogram (C) of the relative fatty acids composition (% TFA) for three Phaeodactylum tricornutum strains (Fito, M28 and B58). A: Nine objects representing the three strains at the three seasons (spring, summer, autumn) during six-months repeated-batch cultivation in flat panel outdoor bioreactors in Bergen, western Norway, and eight variables, representing the fatty acids with highest impact on the distributions. Values are average of all samples of the respective seasons (n = 30, 72 and 60 for spring, summer and autumn, respectively). B: Same variables and objects as in (A) including additional data from laboratory experiments (average of two measurement replicates) for Fito, B58 (two biological replicates) and M28 (one biological replicate). C: Dendrogram showing dissimilarities between the nine outdoor and five laboratory objects. Laboratory data are from exponential growth phase during batch experiments with experimental setup described for M28 in Steinrücken et al. [14].