Table II:

Summary of microscopic counts of diatom species for Groups II and III. Mean abundances represent the average of the duplicates on the specific experiment day ±standard deviation.

Experiment day	1	11	16	17	19	31	44
Group II (mean abundance ± SD)
Chaetoceros sp ~5 μm
Control	–	6 ± 5	39 ± 18	37 ± 23	37 ± 18	8 ± 5	5 ± 1
High CO2	–	4 ± 3	28 ± 3	16 ± 1	28 ± 11	11 ± 9	–
Greenhouse	–	5 ± 4	25 ± 18	15 ± 5	14 ± 1	2 ± 1	–
Skeletonema costatum
Control	2 ± 1	67 ± 30	1032 ± 1013	5686 ± 1727	2245 ± 1282	3989 ± 1474	682 ± 453
High CO2	1 ± 0.5	106 ± 22	1487 ± 60	2430 ± 309	3019 ± 2659	1929 ± 357	25 ± 1
Greenhouse	1 ± 0.5	349 ± 109	2393 ± 670	3456 ± 2410	2833 ± 511	516 ± 124	–
Group III (mean abundance ± SD)
Chaetoceros sp > 20 μm
Control	–	–	62 ± 9	94 ± 27	73 ± 23	106 ± 29	66 ± 14
High CO2	–	10 ± 7	57 ± 15	72 ± 11	107 ± 16	72 ± 51	34 ± 19
Greenhouse	–	19 ± 1	115 ± 15	95 ± 23	74 ± 21	35 ± 11	–
Thalassiosira sp
Control	–	28 ± 3	305 ± 156	730 ± 50	657 ± 153	695 ± 56	383 ± 89
High CO2	–	42 ± 4	440 ± 41	960 ± 23	784 ± 149	655 ± 357	398 ± 69
Greenhouse	1 ± 1	119 ± 38	1054 ± 80	1022 ± 257	1061 ± 283	1116 ± 357	174 ± 101
Thalassionema nitzschioides
Control	–	3 ± 1	12 ± 9	12 ± 1	23 ± 7	25 ± 5	–
High CO2	–	–	18 ± 8	18 ± 2	13 ± 1	5 ± 2	–
Greenhouse		7 ± 4	45 ± 20	37 ± 5	41 ± 22	33 ± 17	–
Nitzschia longissima
Control	–	6 ± 1	15 ± 4	28 ± 5	18 ± 1	24 ± 4	34 ± 18
High CO2	–	4 ± 1	23 ± 2	31 ± 3	23 ± 6	37 ± 10	27 ± 9
Greenhouse	–	44 ± 4	271 ± 98	289 ± 23	393	335 ± 27	148 ± 141
Navicula transitans
Control	–	3 ± 1	15 ± 3	26 ± 17	49 ± 3	73 ± 11	22 ± 2
High CO2	–	7 ± 4	13 ± 11	39 ± 20	55 ± 28	85 ± 21	6 ± 3
Greenhouse	–	11 ± 2	26 ± 8	32 ± 3	38 ± 16	24 ± 6	–
Fragilaria sp
Control	–	4 ± 3	38 ± 27	71 ± 20	57 ± 5	57 ± 6	18 ± 9
High CO2	–	–	15 ± 11	43 ± 36	47 ± 17	17 ± 15	1 ± 1
Greenhouse	–	13 ± 7	42 ± 23	33 ± 3	38 ± 28	23 ± 6	–
Guinardia sp
Control	–	2 ± 1	94 ± 18	179 ± 63	203 ± 116	277 ± 71	318 ± 133
High CO2	–	6 ± 4	145 ± 69	421 ± 186	69 ± 49	868 ± 90	324 ± 74
Greenhouse	–	12 ± 1	140 ± 35	178 ± 6	115 ± 81	105 ± 51	4 ± 1