Fig. 7

Photosynthetic characteristics of L. glaciale under different light spectral compositions and PAR intensities after 9 months of experimentation. A Minimum saturating irradiance (E_k); B maximum obtained electron transport (ETR_max); C Maximum quantum yield (F_v/F_m; no units) and D photosynthetic efficiency in light-limiting conditions (α; no units). Data presented as mean ± SE, N = 4 individual aquaria per treatment. Data points 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: Table S4