Scientific Investigations Report 2008–5168
U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2008–5168
Table 7. Trophic state based on lake-wide median values for three limnological variables, Coeur d’Alene, Idaho, calendar years 1991–92 and water years 2004–06.
[TS classification source: Wetzel, 1983. Abbreviations: µg/L, microgram per liter; m, meter; TS, trophic state; O, oligotrophic; M, mesotrophic]
| Study | Total phosphorus (µg/L) | Chlorophyll-a (µg/L) | Secchi-disc transparency depth (m) | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Median | TS | TS classification range for median |
Median | TS | TS classification range for median |
Median | TS | TS classification range for median |
|||
| 1991–92 | 5.0 | O | 3.0–17.7 | 0.5 | O | 0.3–4.5 | 4.4 | M | 1.5–8.1 | ||
| 2004–06 | 7.0 | O | 3.0–17.7 | 1.7 | O | 0.3–4.5 | 4.6 | M | 1.5–8.1 | ||
U.S. Department of the Interior | U.S. Geological Survey
URL: http://pubs.usgs.gov/sir/2008/5168
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