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A) A. digitale, B) H. prolifer. Colour code: red = treatment (~760 μatm pCO2), blue = control (ambient conditions). M = mesocosms. Solid lines = prediction from Generalized Additive Mixed Models (GAMMs) (smoother trends p-value < 0.05), with the ambient and high-pCO2 mesocosms shown separately; striped area = confidence interval.
