Table 1. Sampling dates, initial seawater characteristics and incubation temperatures.
| Season | Sampling day | pHNBS in situ | Temperature [°C]1 | Bacteria ml−1 fraction <10 µm | Incubation temperature [°C] |
| spring | April 8, 2010 | 8.26 | 4.7 | 5.0×105 | 5.0 |
| summer | July 1, 2010 | 8.22 | 15.8 | 1.9×106 | 15.0 |
| autumn | October 14, 2010 | 8.15 | 14.2 | 6.5×105 | 14.0 |
| winter | January 20, 2011 | 8.19 | 3.2 | 3.3×105 | 3.0 |
1
Seawater temperatures were obtained from the Helgoland Roads time-series and were directly measured in a seawater sample on the vessel on station [76].