Fig. 5

Chromophore and phycobilin composition and function in L. glaciale under different light spectral compositions and PAR intensities after 9 months of experimentation. A Proportional ratio between PEB, PUB and PCB concentrations (as % of their total concentration). B Ratio between phycoerythrin and phycocyanin bulk concentrations (PE:PC concentration). C Proportional ratio between PEB, PUB and PCB absorbances (as % of their total absorbance). D Ratio between PEB and PCB absorbance (PEB:PCB absorbance). Data in A/C presented as mean; B/D presented as mean ± SE. N = 4 individual aquaria per treatment. Data points in B&D are jittered horizontally around the experimental light intensity for visual clarity. Shallow + red spectrum at 350 µmol photons m⁻² s.⁻¹ only. Statistical model test results of relationship between each measured parameter and light intensity/spectral treatments are provided in Additional File 1: Tables S2 and S3