Table 2.
Responses to nitrogen and vitamin B12 amendments by different size classes of phytoplankton collected from OFP and LIS.
| Total | 0.2–2 μm | >2 μm | ||
|---|---|---|---|---|
| OFP (n = 18) | B12 | 2 | 4 | 5 |
| N | 9 | 5 | 8 | |
| N + B12 | 2 | 4 | 4 | |
| LIS (n = 18) | B12 | 2 | 6 | 4 |
| N | 11 | 11 | 11 | |
| N + B12 | 4 | 2 | 6 | |
| ALL (n = 36) | B12 | 4 | 10 | 9 |
| N | 20 | 16 | 18 | |
| N + B12 | 6 | 6 | 9 | |
Responses for each size fraction were measured via changes in chlorophyll a over time and are shown for each sample location. In addition overall effects were examined by looking at all the experiments conducted for each size class (ALL). An effect of the NO3 + B12 treatments was deemed significant when p < 0.05 compared to the NO3 and B12 only additions. Values represent the number of times a treatment resulted in a positive growth response in that size class.