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This figure shows the mean
Secchi depth at site 1 from 1970 to 2006. Average secchi depth (m) is
plotted on the Y axis, and date is on the X axis. As shown by the red
trendline, there is a trend in decreasing mean Secchi depth. This change is
most likely because of increases in algae growth as indicated by the
historical chlorophyll data, which showed an increasing trend in
chlorophyll-a concentration. The
transparency trend indicates that over the past two and a half
decades, visibility and water quality have declined.
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