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Table 5: Multiregression between chl a and photosynthetic accessory pigments for data of the time series at N12 and M33: chlorophyll b (chl b), chlorophyll + (chl +), and phycoerythrin (PE). , , represent the partial regression coefficients and residual chl a when accessory pigments are null. The inverse of , , represent the mean estimate of the different pigments/chl a ratios. = mean estimates of pigment ratio for chlorophytes (x = 1), chromophytes (x = 2), and cyanobacteria (x = 3).

N12 () Residual chl chl chl + PE Mean coeff. (± SD) K4 = 1.38 (± 0.55) K1 = 1.43 (± 0.60) K2 = 5.11 (± 0.24) K3 = 0.086 (± 0.032) .019 .026 .000 .014 R2 = 96.1% Cx (1/mean coeff) 1/K1 = 0.55 1/K2 = 0.19 1/K3 = 15.4 Cx + SD 0.41 0.18 10.2 Cx – SD 0.83 0.20 31.2 M33 () Residual chl chl chl + PE Mean coeff. (± SD) K4 = 0.63 (± 0.17) K1 = 1.62 (± 0.30) K2 = 4.87 (± 0.55) K3 = 0.069 (± 0.011) .002 .000 .000 .000 R2 = 97.4% Cx (1/mean coeff) 1/K1 = 0.61 1/K2 = 0.20 1/K3 = 14.3 Cx + SD 0.51 0.18 12.3 Cx – SD 0.75 0.23 17.2