TABLE 4.
Mean cell volume of bacterial cells for individual phylogenetic groups
| Location (date, day/mo/yr) | Station (depth, m) | Incubation | Mean cell vol (10−3 μm3)a
|
|||
|---|---|---|---|---|---|---|
| Alpha | Beta | Gamma | CF | |||
| Otsuchi Bay (22/05/01) | A (0) | Initial | 16 (15-18, 233) | 14 (11-19, 36) | 17 (15-20, 62) | 18 (16-21, 105) (−)** |
| End | 14 (14-15, 1,211) | 14 (12-17, 41) | 21 (19-22, 316) | 15 (13-17, 79) | ||
| A (20) | Initial | 11 (10-12, 464) (+)*** | — | 17 (14-19, 88) | 13 (12-14, 150) (+)*** | |
| End | 15 (14-15, 805) | — | 13 (12-15, 149) | 19 (17-20, 201) | ||
| B (0) | Initial | 18 (16-20, 190) | 17 (14-19, 69) | — | 18 (15-22, 59) (+)*** | |
| End | 18 (17-19, 517) | 16 (15-18, 194) | — | 26 (24-27, 385) | ||
| B (40) | Initial | 16 (14-17, 155) (−)*** | 20 (14-31, 21) | 13 (10-15, 52) (+)*** | 13 (10-17, 19) (+)*** | |
| End | 12 (11-13, 321) | 24 (21-28, 88) | 22 (20-24, 179) | 15 (14-16, 209) | ||
| C (0) | Initial | 15 (14-16, 278) | — | 14 (12-17, 60) (+)*** | 16 (15-17, 134) (+)*** | |
| End | 14 (13-15, 243) | — | 35 (31-39, 195) | 21 (19-23, 199) | ||
| C (65) | Initial | 11 (10-12, 131) (+)*** | — | — | 15 (13-17.50) (+)*** | |
| End | 30 (28-32, 470) | — | — | 37 (34-40, 167) | ||
| Otsuchi Bay (24/05/02) | A (0) | Initial | 38 (32-45, 67) (+)*** | — | 38 (22-64, 12) (+)* | 48 (33-72, 12) |
| End | 60 (55-64, 189) | — | 47 (44-49, 249) | 53 (45-61, 52) | ||
| B (0) | Initial | 60 (57-63, 382) (−)*** | — | 59 (51-67, 67) | 49 (43-55, 104) (−)*** | |
| End | 48 (46-49, 595) | — | 51 (47-56, 120) | 33 (30-37, 139) | ||
| C (0) | Initial | 55 (47-64, 27) | — | — | — | |
| End | 63 (60-66, 479) | — | — | — | ||
| Sagami Bay (17/07/02) | 1 (0) | Initial | 34 (33-35, 1,041) (+)*** | — | 31 (29-33, 226) (+)*** | 33 (30-37, 113) (−)*** |
| End | 40 (40-41, 2,752) | — | 38 (37-39, 1,597) | 26 (25-28, 514) | ||
| 1 (100) | Initial | 38 (36-41, 286) (−)*** | — | — | — | |
| End | 31 (25-37, 31) | — | — | — | ||
| Off Kuroshio (18/07/02) | 4 (0) | Initial | 41 (37-44, 234) | — | — | — |
| End | 34 (30-38, 101) | — | — | — | ||
| 4 (100) | Initial | 34 (32-36, 313) | — | — | — | |
| End | 39 (17-91, 10) | — | — | — | ||
For abbreviations, see Table 1, footnote b. Values in parentheses are the 95% confidence interval and the number of cells determined. If the mean cell volume at the end of incubation differs significantly (by Student's t test) from that at the beginning of incubation, symbols are added to indicate the direction of the change (increase [+] or decrease [−]) and the level of significance, as follows: *, P < 0.05; **, P < 0.01; ***, P < 0.001. Calculations of means and 95% confidence intervals as well as the statistical test were carried out by using log-transformed data (see Materials and Methods); back (log−1) transformed values are reported in this table. Dashes indicate that the contribution of the phylogenetic group to total DAPI-positive cells was below the detection limit (1%).