Relative yield of net oxygen production (A) and total biovolume (B).

<p>The main plots compare species combinations whereas the insets compare levels of species richness. Bars represent experiment-long means (± SE) calculated for each replicate and sampling day. Letters above each bar indicate the results of the post-hoc Tukey tests associated with ANOVA. Species combinations are listed with each plot, using the following abbreviations: D – <i>Dunaliella</i>, N – <i>Nannochloris</i>, R – <i>Rhodomonas</i>, Ch – <i>Chaetoceros</i>, Co – <i>Coscinodiscus,</i> M – <i>Melosira</i> and all – all species in the six-species combination.