Table 2.
Na+ concentrations in some algae from freshwater (FW), euryhaline (Eh) or seawater (SW) habitats
| Alga | Habitat | External NaCl (mM) | Cytoplasmic Na (units) | Notes | Reference |
|---|---|---|---|---|---|
| Dunaliella parva | Eh/SW | 400 | 37 (mol m–3 of analysed volume) | X-ray microanalysis. Vacuole contained 349 mol m–3 analysed volume. | Hajibagheri et al. (1986) |
| Chlorella emersonii | FW | 335 | 21 (mm) | Atomic absorption spectrophotometry of cells that contain only small vacuoles. | Greenway and Setter (1979) |
| Acetabularia acetabulum | SW | 460 | 4–295 (mm) | Na-sensitive microelectrode. Large variation but mean of about 60 mm. | Amtmann and Gradmann (1994) |
| Ulva lactuca | Eh/SW | 468 | 8 (mmol kg−1) | Efflux analysis. | Ritchie (1988) |
Euryhaline means that the organism is found in habitats of a wide range of salinities.