Northern Prairie Wildlife Research Center
Figure 4. Secchi disk depth and range of greatest abundance of Vallisneria americana in selected lakes (after Davis and Brinson 1980). The jagged end of a bar represents an approximate measurement.
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/plants/wildcel/fig4.htm
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