Table 2.
Triacylglycerol (TAG) production rates and their contribution to overall daytime net primary production (PP)
| Day (m/d/y) | Water depth (m) | 14C-PPa (mg m−3 d−1) | 2–20 µm PPa (mg C m−3 d−1) | 14C-ARnightb (mg m−3 d−1) | TAG productionc (mg C m−3 d−1) | %TAG C of 14C-PP | %TAG C of 2–20 µm PP | |
|---|---|---|---|---|---|---|---|---|
| Summer 2015 | 7/27/2015 | 15 | 17.6 ± 0.4 | 5.4 ± 2 | 7.6 | 1.08 | 6.1 | 20 |
| 7/28/2015 | 15 | 14.9 ± 2.4 | 2.9 ± 0.9 | 5.2 | 1.16 | 7.8 | 40 | |
| 7/29/2015 | 15 | 16.9 ± 1.5 | 4.3 ± 0.8 | 6.2 | 0.69 | 4.1 | 16 | |
| 8/1/2015 | 15 | 14.7 ± 1.2 | 3.2 ± 0.7 | 6.1 | 1.13 | 7.7 | 36 | |
| Spring 2016 | 3/25/2016 | 25 | 5.8 ± 0.5 | n.d. | 1.8 | 0.42 | 7.3 | n.d. |
| 3/26/2016 | 25 | 5.0 ± 0.7 | 2.7 ± 1.0 | 0.7 | 0.40 | 8.0 | 15 | |
| 3/27/2016 | 25 | 5.8 ± 0.5 | 3.3 ± 1.0 | 2.6 | 0.41 | 7.1 | 12 |
n.d. not determined
aValues represent the average of environmental triplicates ± SD (n = 3)
bAutotrophic respiration (ARnight) determined after Marra and Barber76 from dark 14C incubations
cDaily net TAG production rates were calculated from the difference between the minimum and maximum concentrations observed during each 24-h day