N of Phytoplankton-Grazers InteractionTable 1. Functional responses of microalgae to the presence of grazers.Species T. suecica T. suecica T. suecica T. suecica T. suecica + Euplotes sp. T. suecica + Euplotes sp T. suecica + Euplotes sp T. suecica + Euplotes sp T. suecica + A. tonsa T. suecica + A. tonsa T. suecica + A. tonsa T. suecica + A. tonsa T. weissflogii T. weissflogii T. weissflogii T. weissflogii T. weissflogii + Euplotes sp. T. weissflogii + Euplotes sp. T. weissflogii + Euplotes sp. T. weissflogii + Euplotes sp. T. weissflogii + A. tonsa T. weissflogii + A. tonsa T. weissflogii + A. tonsa T. weissflogii + A. tonsa Synechococcus sp. Synechococcus sp. Synechococcus sp. Synechococcus sp. Synechococcus sp. + Euplotes sp. Synechococcus sp. + Euplotes sp. Synechococcus sp. + Euplotes sp. Synechococcus sp. + Euplotes sp. Synechococcus sp. + A. tonsa Synechococcus sp. + A. tonsa Synechococcus sp. + A. tonsa Synechococcus sp. + A. tonsa[SO42-] mM 1 5 10 30 1 5 10 30 1 5 10 30 1 5 10 30 1 5 10 30 1 5 10 30 1 5 10 30 1 5 10 30 1 5 10Cell volume m3 446.0 192.8 466.5 178.6 484.8 202.1 387.5 139.6 288.5 54.82 274.5 42.67 282.3 53.52 297.7 7.55 336.0 19.53 348.0 14.72 329.3 22.46 341.3 27.68 972.1 296.6 1098 363.9 1065 374.7 1087 350.3 1100 396.7 1071 405.3 1200 402.2 1294 381.3 504.5 51.61 523.2 39.73 482.2 25.98 480.2 24.48 9.70 0.80 9.32 .60 10.1 1.35 9.70 1.26 13.2 2.81 12.3 1.56 12.5 0.59 10.2 0.90 13.6 2.23 15.9 0.45 14.3 0.28 13.3 .Dry weightnbsp; pg cell-1 109.2 31.39 129.3 68.94 107.9 37.29 121.4 25.22 118.9 78.54 197.6 88.79 175.1 17.21 152.5 57.14 94.38 13.94 108.6 24.30 100.9 15.95 96.32 5.18 390.6 39.47 421.3 176.1 295.2 89.7 424.0 13.5 247.1 134.2 347.5 91.2 304.9 24.2 519.3 369.2 113.3 34.98 151.8 25.97 120.3 31.81 112.6 21.68 2.36 0.49 1.95 0.34 2.41 0.64 2.61 0.74 1.57 0.30 1.55 0.48 2.19 0.47 2.10 0.06 4.42 0.99 4.35 0.74 2.95 1.00 2.69 0.Fv/Fm 0.62 0.06 0.62 0.05 0.64 0.06 0.63 0.02 0.61 0.05 0.63 0.03 0.63 0.04 0.59 0.02 0.65 0.04 0.67 0.01 0.68 0.04 0.69 0.03 0.46 0.09 0.48 0.04 0.47 0.12 0.54 0.08 0.55 0.06 0.55 0.08 0.55 0.04 0.56 0.07 0.45 0.07 0.52 0.04 0.54 0.05 0.54 0.04 0.13 0.00 0.16 0.03 0.13 0.02 0.14 0.03 0.29 0.05 0.23 0.07 0.26 0.14 0.23 0.08 n.d. n.d. n.d. n.d.NPQ 0.32 0.27 0.67 0.22 0.52 0.27 0.47 0.38 0.30 0.18 0.24 0.15 0.27 0.17 0.31 0.30 0.19 0.04 0.25 0.Phosphoglycerate kinase 17 0.Clozapine 18 0.PMID:24463635 02 0.16 0.05 0.40 0.36 0.42 0.25 0.51 0.46 0.53 0.66 0.54 0.29 0.33 0.26 0.47 0.38 0.44 0.37 0.24 0.18 0.25 0.13 0.22 0.18 0.15 0.10 0.01 0.01 0.01 0.01 0.00 0.00 0.02 0.03 0.08 0.01 0.06 0.04 0.04 0.04 0.02 0.01 n.d. n.d. n.d. n.d.qP 0.79 0.22 0.72 0.09 0.75 0.12 0.75 0.10 0.79 0.07 0.78 0.09 0.81 0.07 0.84 0.09 0.77 0.02 0.78 0.08 0.80 0.04 0.81 0.06 0.87 0.09 0.88 0.03 0.89 0.04 0.79 0.02 0.90 0.05 0.89 0.04 0.93 0.02 0.90 0.03 0.69 0.21 0.79 0.19 0.78 0.17 0.80 0.15 0.65 0.27 0.68 0.09 0.69 0.14 0.59 0.16 0.40 0.09 0.43 0.14 0.59 0.36 0.54 0.23 n.d. n.d. n.d. n.d.Cell volume, cell dry weight, maximal PSII quantum yield (Fv/Fm), non photochemical quenching coefficient (NPQ) and photochemical quenching coefficient (qP) are shown for Tetraselmis suecica, Thalassiosira weissflogii, Synechococcus sp. cultured at 1, 5, 10 or 30 mM SO42-, in the presence or absence of Euplotes sp. or Acartia tonsa. Results are shown as means standard deviations calculated from at least 4 independent replicates. n.d.: not determined (see text for details)doi: 10.1371/journal.pone.0077349.teffect of the type of grazer was observed: the amount of protein per volu.