Table S1. Concentrations of dissolved inorganic nitrogen (DIN) and phosphate (DIP)
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1 Table S1. Concentrations of dissolved inorganic nitrogen (DIN) and phosphate (DIP) before and at the end of incubations at different nutrient conditions, and particulate organic nitrogen (PON) concentration at the end of incubations. DIN (μmol L 1 ) DIP (μmol L 1 ) PON (μmol L 1 ) HNHP Before 11 ± ±.2 End 92.8 ± 9.7 ± ± 2.7 Molar drawdown 8. ± 1.7 ±.2 LN Before 8.8 ±.1 End 1. ± 9. ± 2.9 Molar drawdown 7.8 ± LP Before ±.1 End < ± 2.7 Molar drawdown ±.1 PON concentration was calculated based on PON quota and cell number at the end of incubation.
2 Table S2. Carbonate chemistry parameters of the media before and at the end of incubations at different nutrient conditions and pco 2 levels. pco 2 (μatm) ph (total TA (μmol DIC (μmol HCO (μmol 2 CO (μmol CO 2 (μmol Ω calcite scale) L 1 ) L 1 ) L 1 ) L 1 ) L 1 ) HNHP LC Before 51±17 a 8.4±1 a 2228±17 a 24±2 a 1829±21 a 159±2 a 1±1 a.8±.1 a End 428±57 b 8.11±5 b 2225±24 a 197±22 b 177±4 b 18±18 a 14±2 b 4.±.5 a HC Before 1±5 a 7.71±2 a 2219±19 a 211±22 a 21±22 a 81±2 a 9±2 a 1.9±.1 a End 95±19 b 7.81± b 2225±24 a 298± b 19±17 b ±14 b ±4 b ±. b LN LC Before 48±2 a 8.±2 a 224±1 a 197±1 a 179±1 a 12± a 1±1 a.9±.1 a End 91±9 b 8.± b 2±8 b 18±45 b 179±48 b 175±9 b 1±1 b 4.2±.2 b HC Before 1± a 7.7±2 a 221± a 215±7 a 198±9 a 85±4 a ±2 a 2±.1 a End 888±114 b 7.82±5 b 2142±8 b 21±47 b 189±49 b 98±8 b 29±4 b ±.2 b LP LC Before 97±1 a 8.14±2 a 2248± a 1982±22 a 1777±17 a 192±8 a 1±1 a 4.±.2 a End 5±24 b 8.1±2 a 2219±2 b 1942±22 b 171±25 b 199±8 a ±1 b 4.8±.2 a HC Before 114±11 a 7.7±4 a 2215±41 a 28±4 a 25±4 a 8±7 a 7±4 a 2.1±.2 a End 78±4 b 7.88±2 b 2228±14 a 284±11 b 1941± b 117± b 25±1 b 2.8±.1 b Different letters represent statistically differences between before and end of the experiments (Tukey Post hoc, p < 5). For more detail information, see Table 1.
3 Table S. Results of three-way ANOVAs for comparison of apparent light use efficiency (α) between growth, POC and PIC production rates at different CO 2 levels and nutrient conditions. Factor F value p value Factor F value p value α N 4.2 =48 P 4.1 <1 Para <1 Para 292. <1 C <.1 =.988 C 14.9 <1 N Para 1.2 <1 P Para 7.5 =2 N C 1.1 = P C 8. = Para C.2 =42 Para C 7.7 =2 N Para C =.54 P Para C.2 =54 α, slop of fitted curves for growth, POC and PIC production rates; N, dissolved inorganic nitrogen (DIN, μmol L 1 ); P, dissolved inorganic phosphate (DIP, μmol L 1 ); C, pco 2 (μatm); Para, growth rate (d 1 ), POC and PIC production rates (pg C cell 1 d 1 ).
4 Emiliania huxleyi N : P = 11 : 1.5 (HNHP) N : P = 8.8 : 1.5 (LN) N : P = 11 : (LP) 41 μatm pco 2 (LC) 925 μatm pco 2 (HC) 8,, 2, 2, 48 μ mol photons m 2 1 s PAR Interactive effects of ocean acidification, light intensity and nutrient availability on physiology and calcification of E. huxleyi Figure S1. A flow chart for the experimental treatments. PAR represents photosynthetically active radiation.
5 Carotenoid (pg cell 1 ) Chl a (pg cell 1 ) HNHP LN LP.18 (a).18 (b).18 (c) LC HC (d) (e) (f) Figure S2. At both LC and HC, light responses of Chl a contents at HNHP (a), LN (b) and LP (c) conditions. At both LC and HC, light responses of carotenoid contents at HNHP (d), LN (e) and LP (f) conditions. The values represent the mean ± standard deviation for four replicates.
6 ETR (mol e g 1 Chl a h 1 ) ETR (mol e g 1 Chl a h 1 ) ETR (mol e g 1 Chl a h 1 ) 48 2 ETR (mol e g 1 Chl a h 1 ) ETR (mol e g 1 Chl a h 1 ) LC HC HNHP (a) (b) LN (f) (g) LP (k) (l) 2 (c) (h) (m) (d) (i) (n) 8 (e) (j) (o) Light intensity ( mol electrons m 2 s 1 ) Light intensity ( mol electrons m 2 s 1 ) Light intensity ( mol electrons m 2 s 1 ) Figure S. Electron transport rate (ETR) of E. huxleyi as a function of instant light intensities, and fitted response curves of ETR to instant light intensities (P-I curves, dashed lines) emitted by the XE-PAM. Under HNHP, at both LC and HC, ETR as a
7 function of instant light intensities and the fitted P-I curves when E. huxleyi were incubated at 48 (a), 2 (b), 2 (c), (d), 8 (e) μmol photons m 2 s 1. Under LN, at both LC and HC, ETR as a function of instant light intensities and the fitted P-I curves when E. huxleyi were incubated at 48 (f), 2 (g), 2 (h), (i), 8 (j) μmol photons m 2 s 1. Under LP, at both LC and HC, ETR as a function of instant light intensities and the fitted P-I curves when E. huxleyi were incubated at 48 (k), 2 (l), 2 (m), (n), 8 (o) μmol photons m 2 s 1. Dashed lines were fitted according to Jasby and Platt (197). The values represent the mean ± standard deviation for four replicates.
8 I k ( mol photons m 2 s 1 ) alpha HNHP LN LP (a) (b) (c).2 LC HC (d) 9 (e) 9 (f) Figure S4. At both LC and HC, the slop (alpha) of fitted P-I curves of E. huxleyi as a function of incubation light intensities at HNHP (a), LN (b) and LP (c) conditions. At both LC and HC, fitted saturation light intensity (I k ) of E. huxleyi as a function of incubation light intensities at HNHP (d), LN (e) and LP (f) conditions. The values represent the mean ± standard deviation for four replicates.
9 PIC production rate (pg C cell 1 d 1 ) POC production rate (pg C cell 1 d 1 ) 1 14 (a) HNHP 1 14 (b) LN 1 14 (c) LP 1 8 LC HC (d) 9 (e) 9 (f) Figure S5. At both LC and HC, POC production rates of E. huixleyi as a function of light intensities at HNHP (a), LN (b) and LP (c) conditions. At both LC and HC, PIC production rates of E. huixleyi as a function of light intensities at HNHP (d), LN (e) and LP (f) conditions. The solid lines in each panel were fitted using the model provided by Eilers and Peeters (1988). The values represent the mean ± standard deviation for four replicates.
10 PON production rate (pg N cell 1 d 1 ) PON quota (pg N cell 1 ). HNHP LN (a). (b). (c) LP 1.8 LC HC (d) (e) (f) Figure S. At both LC and HC, PON quota of E. huixleyi as a function of light intensities at HNHP (a), LN (b) and LP (c) conditions. At both LC and HC, PON production rates of E. huixleyi as a function of light intensities at HNHP (d), LN (e) and LP (f) conditions. The solid lines in each panel were fitted using the model provided by Eilers and Peeters (1988). The values represent the mean ± standard deviation for four replicates.
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