Fig. 4

Bulk chromophore/phycobilin concentrations in L. glaciale under different light spectral compositions and PAR intensities after 9 months of laboratory incubation. A phycoerythrobilin (PEB), B phycourobilin (PUB), C phycocyanobilin (PCB), D phycoerythrin (PE), E phycocyanin (PC), F allophycocyanin (APC), G chlorophyll-a (Chl), and H ratio between total phycobilisome and chlorophyll-a concentrations (PBS:Chl). Data presented as mean ± SE, N = 4 individual algae per treatment. Data points are jittered horizontally around each experimental light intensity for visual clarity. Shallow + red spectrum tested 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: Table S1