NEW: Annual Report - George Mason University

Photosynthetic Rate (mg C/L/hr)
1000
100
Station 7: June-Sept
1980 1985 1990 1995 2000 2005
YEAR
Photosynthetic rate in the cove
showed a gradual decline over the
study period (Figure 116). The
trend line decreased from about
800 to about 550 mg C/L/hr over
the period from 1984 to 2003.
Linear regression analysis yielded
a significant linear regression
coefficient of -33.6 mgC/L/hr per
year yielding a total decline of
672 mg C/L/hr over the long term
study period (Figure 116).
Figure 116. Long term trend in Photosynthetic Rate at Light Saturation (GMU Lab Data).
Station 7. Gunston Cove.
Photosynthetic Rate (mg C/L/hr)
1000
100
10
Station 9: June-Sept
1980 1985 1990 1995 2000 2005
YEAR
Photosynthetic rate in the river
showed some systematic
variability over the study period
rising during the early 1990’s and
declining in recent years (Figure
117). Linear regression did not
show a significant trend over the
study period (Table 10).
Figure 117. Long term trend in Photosynthetic Rate at Light Saturation (GMU Lab Data).
Station 9. River mainstem.
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