Comparison of culture and field metabolomes. Intracellular concentrations of quantified compatible solutes in Nitzschia lecointei cultures grown at salinity 32 and –1°C and field samples of the diatom-dominated mixed community in the bottom 5 cm of sea-ice cores collected from Utqiaġvik, AK. Values are means (n = 3) for all compounds in the culture and field samples. Homarine and trigonelline are not included in this analysis as their concentrations were near the detection limit and not determined in the culture samples, as discussed in the text. Their concentrations in the field samples are available in Table 2. Linear regression statistics are provided on the plot. The shaded area represents a pointwise 95% confidence interval of the fitted values. Axes are log-scaled. Inset is a Venn diagram of targeted metabolites detected in the same N. lecointei cultures and field samples. DOI: https://doi.org/10.1525/elementa.421.f5