Figure 6
δ15N (light grey square), δ13C (dark grey square) and chlorophyll a content (green star) from the bottom-ice (solid line) and water directly below ice (stipple line) at the (A) outer site and (B) inner site, across all sampling weeks. Redundancy analysis (RDA) biplot (C) of the mean biomolecular content of N. frigida cells from each sampling site and time point with δ13C and δ15N stable isotope values from the sea ice and water below displayed with ordination bi-plot overlay, only significant vectors are shown and RDA model is significant (p < 0.05). (D) Content of lipid (ester carbonyl; top panel) and protein (amide II) (bottom panel) vs. δ13C values, at the outer site (green) and inner site (blue). The data (both locations combined) are fitted with linear regressions, with 95% confidence intervals (grey shading).
