TABLE 2.
Characteristics of the seven genotype 1 strains and reference strain MWH-Tana7 (16S rRNA genotype 7)
| Strain | Habitat | Water temp (°C)a | Season of samplingb | No. of sequence differencesc | Optimum temp (°C) | Maximum temp (°C) | Highest growth rate (h−1)e | Shortest doubling time (h)e | Cell size (μm3)f |
|---|---|---|---|---|---|---|---|---|---|
| MWH-Mo1 | Lake Mondsee | 4.7 | w | 28.8 | 35.0 | 0.344 | 2.0 | 0.062 | |
| MWH-Wo1 | Lake Wolfgangsee | 4.5 | w | 3 | 27.5 | 37.0 | 0.352 | 2.0 | 0.059 |
| MWH-Aus1 | Pond, Sydney | 31.0 | s | 3 | 25.0 | 36.0 | 0.321 | 2.2 | 0.064 |
| MWH-HuqW11 | Pond, Huqiu | NDd | a | 2 | 31.8 | 37.0 | 0.365 | 1.9 | 0.057 |
| MWH-Ta1 | Lake Taihu (site 1) | 7.2 | w | 3 | 34.2 | 37.0 | 0.442 | 1.6 | 0.055 |
| MWH-TaSIIW17 | Lake Taihu (site 2) | 14.3 | a | 2 | ND | ND | ND | ND | ND |
| MWH-Uga2 | Pond near Jinja | >20g | r | 5 | 35.6 | 37.0 | 0.388 | 1.8 | 0.061 |
| MWH-Tana7h | Tana River, Kenya | >20g | r | 59 | ND | ND | ND | ND | 0.065 |
a
Water temperature at the time of sampling for isolation of bacteria.
b
w, winter; s, summer; a, autumn; r, rainy season.
c
Number of different sequence positions in a 2,310-bp fragment of the ribosomal operon compared with the sequence of MWH-Mo1.
d
ND, not determined.
e
Growth in liquid NSY medium (3 g liter−1) at the temperature allowing the highest growth rate.
f
Growth in liquid NSY medium (3 g liter−1) at ca. 25°C.
g
The temperature was not measured; the temperature usually does not drop below 20°C.
h
The genotype I strains and strain MWH-Tana7 have a level of 16S rRNA gene sequence similarity of 99.8%.