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The growth and physiological characteristics of eight strains of diatoms isolated from aquatic habitats with differing water column characteristics were studied under varying light intensities to compare adaptations to low and high light intensity. Diatoms isolated from different habitats were grouped into low light-adapted (LLA) and high light-adapted (HLA) diatoms based on their differences in growth and photoacclimation characteristics. LLA diatoms had higher growth rates and higher photosynthetic activity at relatively lower light intensities (2, 12.5, and 25 μmol photons m⁻² s⁻¹) compared to relatively higher light intensities (60 and 80 μmol photons m⁻² s⁻¹). HLA diatoms had higher growth rates and higher photosynthetic activity at relatively higher light intensities (60 and 80 μmol photons m⁻² s⁻¹) compared to relatively lower light intensities (2, 12.5 and 25 μmol photons m⁻² s⁻¹). LLA diatoms …