Table 2 Open in new tab Gross and net...

Gross C:N fixation ratio	Net C:N fixation ratio	N₂net fixation rate (fmol N cell⁻¹h⁻¹)^a	NH₄⁺-release rate (fmol N cell⁻¹h⁻¹)
6.3^b	7.3±3.4^c	4.8±3.2	0.28±0.15	2.6	2.2

Gross C:N fixation ratio	Net C:N fixation ratio	N₂net fixation rate (fmol N cell⁻¹h⁻¹)^a	NH₄⁺-release rate (fmol N cell⁻¹h⁻¹)
6.3^b	7.3±3.4^c	4.8±3.2	0.28±0.15	2.6	2.2

Table 2

Gross and net C:N fixation ratio, N₂-fixation rate, and net NH₄⁺-release rate in Aphanizomenon sp. traced by ¹⁵N

Gross C:N fixation ratio	Net C:N fixation ratio	N₂net fixation rate (fmol N cell⁻¹h⁻¹)^a		NH₄⁺-release rate (fmol N cell⁻¹h⁻¹)
Light	Light	Light	Dark	Light	Dark
6.3^b	7.3±3.4^c	4.8±3.2	0.28±0.15	2.6	2.2

Gross C:N fixation ratio	Net C:N fixation ratio	N₂net fixation rate (fmol N cell⁻¹h⁻¹)^a		NH₄⁺-release rate (fmol N cell⁻¹h⁻¹)
Light	Light	Light	Dark	Light	Dark
6.3^b	7.3±3.4^c	4.8±3.2	0.28±0.15	2.6	2.2

Measured by nanoSIMS.

Estimating from gross photosynthesis and gross N₂ fixation (net N₂ fixation+NH₄⁺ release).

Net C and net N₂ fixation in light of the same cells measured by nanoSIMS.