Table 1 Summary of community N2 fixation rates and nanoSIMS calculations by station

From: Cell-specific measurements show nitrogen fixation by particle-attached putative non-cyanobacterial diazotrophs in the North Pacific Subtropical Gyre

station

natural-light community N2 fixation rate (nmol N l−1 d−1)

all-dark community N2 fixation rate (nmol N l−1 d−1)

particles l−1 x 104 (5–150 µm)

total particles analyzed by nanoSIMS

% particles found with NCD

# NCD cells per station

NCD N2 fixation rates (fmol N cell−1 d−1)

NCD abundance (cell L−1)

NCD N2 fixation rate contribution (nmol N L−1 d−1)

% NCD N2 fix to community light N2 fix rates

% NCD N2 fix to community dark N2 fix rates

5

0.51 ± 0.11

0.35 ± 0.14

7.57 (± 1.07)

196

1.50

5

2.92 (±3.49)

3.48 × 103

0.01

1.99

2.9

10

0.19 ± 0.13

0.12 ± 0.06 (x)

20.4 (± 8.98)

146

4.11

29

0.31 (±0.33)

2.94 × 104

0.01

4.80

7.6

14

0.23 ± 0.12 (x)

0.06 ± 0.03 (x)

7.79 (± 4.30)

123

–

0

–

–

–

–

–

17

0.10 ± 0.03 (x)

<MQR

3.21 (± 0.84)

217

–

0

–

–

–

–

–

20

0.15 ± 0.11 (x)

<MQR

7.22 (± 1.22)

182

–

0

–

–

–

–

–

22

0.12 ± 0.02 (x)

0.06 ± 0.02 (x)

3.28 (± 0.31)

126

–

0

–

–

–

–

–

23

0.38 ± 0.07

NA

4.63 (± 1.63)

115

–

0

–

–

–

–

NA

  1. Calculations represent values scaled-up from a limited analysis and should be considered as rough estimates included for context. The basis of the estimates were made using the particle concentration and the percent of analyzed particles with an associated putative NCD to calculate ‘NCD abundance’, ‘NCD N2 fixation rate contribution’, and ‘% NCD N2 fix to community light/dark N2 fix rates’. Values represent mean (± standard deviation of the mean) at each station, N2 fixation rates marked with an ‘x’ are above the MQR but below the LOD.
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