Fig. 1
From: UV radiation limited the expansion of cyanobacteria in early marine photic environments
Growth rates of UV-C irradiated Synechococcus cultures. Cultures were irradiated at an exposure of 500 J/m2 in Fe(III)- and Si-supplemented media relative to irradiated (dark circle: control UV) and un-irradiated (white circle: control) cultures in un-supplemented growth media. a Fe(III) concentrations representing environments proximal to a source of iron-rich upwelling. White diamond: low Fe(III)/Si, 0.15/0.6 mM; gray triangle: high Fe(III)/Si, 0.55/2.0 mM; white square: Si only, 2.0 mM; black square: Fe(III) only, 0.35 mM. b Fe(III) concentrations (0.04 mM) representing environments located distally from a source of iron-rich upwelling (i.e., background concentrations for Archean seawater25). Black triangle: background Fe(III)/Si 0.04/0.6 mM. Growth rates calculated on cultures grown in triplicate in two biological replicates, error bars represent standard deviation at 2σ uncertainty
