Multiple Regression of cell volume on temperature and C∶N ratios.

Regression according to the model log10 V = a+b.t+c.log10(C∶N), where t is expressed in °C and V in µm3C; partial correlation coefficients (Rt, RCN), partial probabilities of error (Pt, PCN), R2 for the full model, and probability of error for the full model (Pmodel); N = 9, except for Ceratium tripos, Ceratium fusus, and Chaetoceros brevis which disappeared from the N3 – 19.5°C treatment combination (N = 6). The temperature effect is also shown as % volume reduction per °C.