USGS Scientific Investigations Report 2012-5069  - Spatial and Temporal Dynamics of Cyanotoxins and Their Relation to Other Water Quality Variables in Upper Klamath Lake, Oregon, 2007

Table 3. Median and range of large (> 63 µm) particulate (cell associated) and dissolved microcystin concentrations at each sample site between July 7 and September 14, Upper Klamath Lake, Oregon, 2007–09. 

[Depth-integrated samples from sites EPT and MDT were collected between July 7 and August 3, 2009. Samples collected at these sites on and after August 10, 2009, were taken at one-quarter (upper) and three-quarter (lower) depths in the water column. The numbers of depth-integrated samples are indicated by italics. All other samples were collected at discrete depths. Dissolved microcystin concentrations were not measured in 2007. Only sites MDN and WMR were sampled in all years of the study. Abbreviations: MQL, method quantitation limit; µm, micrometer; µg/L, microgram per liter; <, less than; >, greater than; –, no samples collected] 

Sample site	2007			2008			2009			Summary
Sample site	Number of samples	Median (µg/L)	Range (µg/L)	Number of samples	Median (µg/L)	Range (µg/L)	Number of samples	Median (µg/L)	Range (µg/L)	Number of samples	Median (µg/L)	Range (µg/L)
Large particulate (cell associated) microcystin concentrations (>63 µm)
MDN	3	0.73	0.64–17.4	5	0.03	0.01–0.33	11	1.01	0.01–11.8	19	0.47	0.01–17.4
WMR	3	6.41	0.64–7.35	5	0.53	0.19–1.13	11	0.64	0.15–6.23	19	0.64	0.15–7.35
EPT	3	1.92	0.44–12.6	0	–	–	5	0.20	0.001–0.78
EPT Upper	0	–	–	0	–	–	6	2.85	0.24–6.54
EPT Lower	0	–	–	0	–	–	6	1.83	0.31–2.39
MDT	3	1.48	1.33–12.5	0	–	–	5	0.09	0.03–3.82
MDT Upper	0	–	–	0	–	–	6	3.98	0.51–9.81
MDT Lower	0	–	–	0	–	–	6	4.80	1.26–24.4
MDL	0	–	–	5	0.23	0.02–1.55	0	–	–
RPT	3	1.81	1.32–10.1	0	–	–	11	1.37	0.04–9.06
NBI	0	–	–	5	0.03	0.01–0.29	0	–	–
HDB	3	2.30	1.22–13.1	0	–	–	0	–	–
Dissolved microcystin concentrations
MDN				5	0.23	0.21–1.10	11	1.05	< MQL–3.93	16	0.61	<MQL–3.93
WMR				5	0.25	0.18–0.36	11	0.85	< MQL–2.49	16	0.47	<MQL–2.49
EPT				0	–	–	5	0.33	< MQL–2.64
EPT Upper				0	–	–	6	1.95	1.01–3.12
EPT Lower				0	–	–	6	2.26	0.60–2.98
MDT				0	–	–	5	0.35	< MQL–4.87
MDT Upper				0	–	–	6	2.42	2.28–3.38
MDT Lower				0	–	–	6	2.46	1.43–3.19
MDL				5	0.49	0.21–0.75	0	–	–
RPT				0	–	–	11	1.02	< MQL–2.77
NBI				5	0.35	0.20–0.47	0	–	–
HDB				0	–	–	0	–	–

Spatial and Temporal Dynamics of Cyanotoxins and Their Relation to Other Water Quality Variables in Upper Klamath Lake, Oregon, 2007–09

Spatial and Temporal Dynamics of Cyanotoxins and Their Relation to Other Water Quality Variables in Upper Klamath Lake, Oregon, 2007–09 