Table 4.
Comparison between the physiological characteristics of heterotrophic microorganisms in SLW and those of other aquatic environments.
| Location | Climate | Salinity | Doubling time (days) | Growth Efficiency | Leu:TdR | Reference |
|---|---|---|---|---|---|---|
| Subglacial Lake Whillans | Polar (Antarctic) | Fresh | 118 | 0.08 | 3.6 | This study |
| Ross Sea | Polar (Antarctic) | Saline | 4.33 | 0.24 | 9.2 | Carlson et al., 1999; Ducklow et al., 2001 |
| McMurdo Ice Shelf | Polar (Antarctic) | Saline | 23.1 | 0.70 | 11 | Vick-Majors, 2016 |
| Northeast Atlantic Ocean | Subtropical | Saline | 0.78 (0.46) | 0.16 (0.15) | 19.7 (12.6) | Alonso-Sáez et al., 2007 |
| North Pacific Ocean | Temperate | Saline | 0.33 (0.79) | 0.15 (0.05) | 8.9 (3.7) | del Giorgio et al., 2011 |
| Svalbard (Kongsfjorden) | Polar (Arctic) | Saline | 3.69 | 0.13 | 7.9 | Motegi et al., 2013 |
| East Lake Bonney | Polar (Antarctic) | Fresh | 15.5 (39.1) | 0.29 (0.05)* | 18.6 | Vick and Priscu, 2012 |
| West Lake Bonney | Polar (Antarctic) | Fresh | 7.2 (8.7) | 0.32 (0.04)* | 39.7 | Vick and Priscu, 2012 |
| Lake Fryxell | Polar (Antarctic) | Fresh | 33.6 (77.9) | 0.49 (0.07)* | 59.1 | Vick and Priscu, 2012 |
| Mackenzie River | Polar (Arctic) | Fresh | 1.79 | 0.65* | 4.92 | Galand et al., 2008 |
| Beaufort Sea Coast | Polar (Arctic) | Saline | 6.16 | 0.47* | 5.50 | Galand et al., 2008 |
| Greenland | Polar (subarctic) | Saline | 0.44 | 0.11* | 69.1 | Kaartokallio et al., 2013 |
| Deep subsurface sediments | Temperate | Saline | ~1–1000 years | – | – | Reviewed by Jørgensen (2011) |
Leu:Tdr is the molar ratio of leucine to thymidine incorporation. Doubling times were determined from published growth rates as ln2/growth rate, or from growth rates calculated from published rates of carbon production and bacterial abundance.
indicates that published bacterial production data was used to estimate growth efficiency according to the relationship between bacterial respiration and bacterial production described by del Giorgio and Cole (1998) and used by Takacs et al. (2001) for Antarctic surface lakes. Parentheses indicate standard deviations calculated for studies that included multiple samples, either in space or time.