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2007 Summaries of Wildlife Research Findings - Minnesota State ...

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Relative Units<br />

9<br />

8<br />

7<br />

6<br />

5<br />

4<br />

3<br />

2<br />

1<br />

a) b)<br />

Phytoplankton Abundance Lake Levels<br />

ug Chlorophyll a per liter<br />

Approximate “turbid-state threshold”<br />

Chlorophyll a : Total Phosphorus<br />

May 31 June 7 June 20 July 9 July 23 Aug 1<br />

502<br />

Figure 6. Phytoplankton abundance as indicated by water-column chlorophyll a concentrations (top line) at Kenogama Lake during<br />

<strong>2007</strong>. Bottom (dashed) line depicts ratios <strong>of</strong> Chlorophyll a:Total phosphorus; values below theoretical threshold are usually<br />

associated with lakes in a clear-water state (Dokulil and Teubner 2003, panel a). Relative lake levels shown on right (panel b)<br />

Water Level at Staff Gauge (ft)<br />

2.5<br />

2.0<br />

1.5<br />

1.0<br />

0.5<br />

0.0<br />

May 31 June 7June 20 July 9 July 23 Aug 1 Aug 15

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