Adaptation to High-Intensity, Low-Wavelength Light among Surface Blooms of the Cyanobacterium Microcystis aeruginosa

摘要: Natural populations of the nuisance bloom cyanobacterium Microcystis aeruginosa obtained from eutrophic Neuse River, N.C., revealed optimal chlorophyll a-normalized photosynthetic rates and resistance to photoinhibition at surface photosynthetically active radiation (PAR) intensities. At saturating PAR levels these exhibited higher in quartz than Pyrex vessels. Eucaryotic algal same river failed counteract photoinhibition. levels, such generally yielded lower containers they did containers. Cultivation natural under laboratory conditions led physiologically distinct which had photoinhibitory characteristics similar those other cultured cyanobacterial eucaryotic algae. Our findings indicate that (i) production among is best characterized quantified rather incubation vessels; (ii) extrapolation trends highly subjective culture histories may yield contradictory results; (iii) buoyant surface-dwelling populations, exhibiting senescence, are poised optimizing utilization, thereby maintaining numerical dominance waters when physico-chemical favor formation.