Table 3.
Turnover rate and half-life (h) of carbon and nitrogen elements in marine ciliates (Pseudokeronopsis pararubra, Protocruzia labiata, Strombidium sulcatum, and Uronemella filificum) fed with Chaetoceros calcitrans and Isochrysis galbana calculated using the exponential equation (y=a+bect) and regressions of carbon and nitrogen stable isotope data vs. time since diet switch.
| Isotope | Diet | Species name | Turnover rate | Half-life (h) |
|---|---|---|---|---|
| δ13C | Chaetoceros calcitrans | Pseudokeronopsis pararubra | −0.09 | 7.4 |
| Protocruzia labiata | −0.10 | 6.9 | ||
| Strombidium sulcatum | −0.11 | 6.1 | ||
| Uronemella filificum | −0.08 | 9.2 | ||
| Isochrysis galbana | Pseudokeronopsis pararubra | −0.06 | 11.3 | |
| Protocruzia labiata | −0.03 | 22.7 | ||
| Strombidium sulcatum | −0.03 | 23.0 | ||
| Uronemella filificum | −0.05 | 14.6 | ||
| δ15N | Chaetoceros calcitrans | Pseudokeronopsis pararubra | −0.15 | 4.6 |
| Protocruzia labiata | −0.21 | 3.4 | ||
| Strombidium sulcatum | −0.04 | 18.2 | ||
| Uronemella filificum | −0.03 | 24.9 | ||
| Isochrysis galbana | Pseudokeronopsis pararubra | −0.05 | 14.7 | |
| Protocruzia labiata | −0.06 | 11.4 | ||
| Strombidium sulcatum | −0.23 | 3.1 | ||
| Uronemella filificum | −0.05 | 13.3 |