Table 2.

The effect of 4-day treatment with 80–90 μmol photons m⁻² s⁻¹ PAR, 6–7 W m⁻² UV-A and 0.37–0.45 W m⁻² UV-B on the intracellular mycosporine-like amino acid contents (MAAs) in the streptophyte algal species studied

Species	PAR	PAR + UVA + UVB	Induction factor
H. parvula	6.91	16.06	2.3
S. arenaria SAG 2560	3.81	8.48	2.2
S. costaricana	0.24	6.15	25.6
S. capillatum	0.16	1.24	7.6

Due to a lack of biomass, only one replicate for each strain could be tested. Concentrations are given as mg MAAs g⁻¹ dry weight