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Scientific Investigations Report 2008–5026

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2008–5026

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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, June–October 2005.

[NA, not available]

Chlorophyll a concentrations, in micrograms per liter
Week of Howard Bay
(HDB)		 Midlake
(MDL)		 Middle
of trench
(MDT)		 Eagle
Point
(EPT)		 Upper Klamath
Lake at
Williamson
River outlet
(WMR)		 Midnorth
(MDN)
June 13–17 12 58 NA 38 22 29
June 20–24 64 175 70 13 56 88
June 27–July 1 152 35 175 111 134 110
July 5–8 700 61 49 26 88 701
July 11–15 78 50 315 35 152 188
July 18–22 257 32 38 38 50 71
July 25–29 504 10 76 21 30 28
Aug. 1–5 105 117 38 9 18 9
Aug. 8–12 111 58 140 18 64 55
Aug. 15–19 560 41 280 79 158 76
Aug. 22–26 110 122 105 58 292 304
Aug. 29–Sept. 2 337 76 164 73 490 158
Sept. 6–9 455 71 210 88 105 114
Sept. 12–16 350 149 1,121 24 113 105
Sept. 19–23 1,354 607 2,055 73 93 292
Sept. 26–30 264 175 175 79 29 228
Oct. 3–7 28 86 70 93 58 99
  Maximum concentrations at each site before algae decline resulting from cell death
  Minimum concentrations at each site during algae decline resulting from cell death
  Sample dates during algae decline resulting from cell death

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