TABLE 1.
Summary of the variability in environmental and bacterial variablesa
| Parameter | Units | Whole water layers
|
Epilimnion
|
Hypolimnion
|
|||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Range | Mean | SD | n | Range | Mean | SD | n | Range | Mean | SD | n | ||
| Total bacteria | 106 cells ml−1 | 0.6-8.2 | 2.3 | 1.4 | 571 | 1.0-8.2 | 3.6 | 1.8 | 168 | 0.6-2.5 | 1.2 | 0.3 | 212 |
| Temp | °C | 6.5-30.2 | 11.8 | 6.2 | 571 | 10.4-30.2 | 19.8 | 5.5 | 168 | 6.8-9.9 | 7.7 | 0.7 | 212 |
| DO | mg liter−1 | 3.0-11.5 | 8.8 | 1.8 | 571 | 6.5-10.4 | 8.9 | 0.9 | 168 | 3.0-10.3 | 7.5 | 1.7 | 212 |
| Chl a | μg liter−1 | 0.1-11.0 | 1.8 | 1.7 | 568 | 0.2-8.8 | 3.2 | 1.6 | 166 | 0.1-5.0 | 0.5 | 0.5 | 211 |
| POC | μmol liter−1 | 4.3-71.1 | 20.8 | 12.1 | 571 | 11.2-70.8 | 32.2 | 9.9 | 168 | 4.3-54.0 | 14.5 | 9.3 | 212 |
| PON | μmol liter−1 | 0.3-9.3 | 2.4 | 1.4 | 568 | 0.8-7.6 | 3.6 | 1.2 | 168 | 0.3-3.8 | 1.5 | 0.8 | 209 |
| POP | μmol liter−1 | 0.015-0.249 | 0.101 | 0.042 | 571 | 0.015-0.249 | 0.128 | 0.045 | 168 | 0.021-0.208 | 0.077 | 0.035 | 212 |
| DOC | μmol liter−1 | 72.6-138.4 | 94.1 | 13.1 | 561 | 90.1-138.4 | 109.4 | 9.3 | 166 | 72.6-133.3 | 84.5 | 6.9 | 206 |
| DON | μmol liter−1 | 1.2-18.1 | 7.2 | 1.7 | 568 | 1.2-15.0 | 8.3 | 1.4 | 167 | 3.3-8.1 | 5.9 | 1.2 | 210 |
| DOP | μmol liter−1 | 0-0.212 | 0.054 | 0.030 | 562 | 0-0.212 | 0.071 | 0.032 | 165 | 0-0.179 | 0.036 | 0.028 | 208 |
| DIN | μmol liter−1 | 0-24.3 | 14.4 | 6.9 | 570 | 0-20.7 | 5.3 | 3.9 | 167 | 10.2-24.3 | 20.5 | 1.9 | 211 |
| DIP | μmol liter−1 | 0-0.425 | 0.061 | 0.096 | 570 | 0-0.044 | 0.009 | 0.009 | 167 | 0.001-0.425 | 0.140 | 0.121 | 211 |
a
The epi- and hypolimnion data are from the thermal stratification period (June, August, October, and December). Abbreviations: PON, particulate organic nitrogen; POP, particulate organic phosphorus; DON, dissolved organic nitrogen; DOP, dissolved organic phosphorus.