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Scientific Investigations Report 2008–5201

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2008–5201

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Table 4. Maximum and minimum chlorophyll a concentrations and dates relative to Aphanizomenon flos-aquae blooms and decline during sampling season, Upper Klamath Lake, Oregon, May–October 2006.

[Site locations are shown in table 2. NA, not available]

Week of Chlorophyll a concentrations, in micrograms per liter
Midnorth
(MDN)
Upper Klamath
Lake at
Williamson
River outlet
(WMR)
Rattlesnake
Point (RPT)
Howard Bay
(HDB)
Middle of
Trench (MDT)
Eagle Point
(EPT)
May 22–26 6 6 5 n/a 9 8
May 29–June 2 2 7 2 2 3 3
June 5–9 8 6 4 2 6 6
June 12–16 12 7 15 16 12 6
June 19–23 21 40 45 133 81 10
June 26–30 217 169 69 91 70 160
July 3–7 n/a 178 50 434 168 37
July 10–14 76 94 118 204 179 32
July 17–21 53 16 75 9,305 83 5
July 24–28 48 23 51 198 33 10
July 31–Aug. 4 93 27 79 175 96 51
Aug. 7–11 178 31 101 372 352 38
Aug. 14–18 232 34 37 152 39 98
Aug. 21–25 85 137 70 304 189 94
Aug. 28–Sept. 1 128 139 93 385 159 74
Sept. 4–8 191 250 177 537 258 26
Sept. 11–15 130 133 144 323 234 170
Sept. 18–22 146 276 131 152 441 52
Sept. 25–29 198 92 165 609 196 27
Oct. 2–6 101 2 97 143 154 199
 Maximum concentrations at each site before algae decline resulting from cell death
 Minimum concentrations at each site during algae decline resulting from cell death
  Maximum concentrations at each site after algae decline resulting from cell death
  Sample dates during algae decline resulting from cell death

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