Fig. 6From: Red algae acclimate to low light by modifying phycobilisome composition to maintain efficient light harvestingPhycobilisome excitation energy transfer in L. glaciale under different light spectral compositions and PAR intensities after 9Ā months of experimentation. A Proportional ratio between PEB, PUB and PCB EET (as % of their total EET). B PEB:PCB contributions to PSI fluorescence based on fluorescence excitation spectra detected at 720Ā nm (PEB:PCB EET). C Relationship between PEB:PCB absorbance and PEB:PCB EET; modelled linear regression (black solid line) with 95% confidence intervals (dotted lines) is shown: yā=āāāā0.679ā+ā1.95āĆā, r2ā=ā0.191, pā=ā0.012. Data in A presented as mean, and in B as meanāĀ±āSE where Nā=ā4 individual algae (from different aquaria) per treatment (except mesophotic spectrum at 350 and 80Ā Āµmol photons mā2Ā sā1 where Nā=ā3). Data points in B are jittered horizontally around the experimental light intensity for visual clarity. Shallowā+āred spectrum at 350Ā Āµmol photons mā2Ā s.ā1 only. Statistical model test results of relationship between each measured parameter and light intensity / spectral treatments are provided in Additional File 1: Table S2Back to article page