NEW: Annual Report - George Mason University
NEW: Annual Report - George Mason University
NEW: Annual Report - George Mason University
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94<br />
Brachionus (#/L)<br />
1000.0<br />
100.0<br />
10.0<br />
1.0<br />
Station 7: All Months<br />
0.1<br />
1985 1990 1995<br />
YEAR<br />
2000 2005<br />
Brachionus is the dominant<br />
rotifer in Gunston Cove and<br />
the trends in total rotifers<br />
are mirrored in those in<br />
Brachionus (Figure 124).<br />
The LOWESS line for<br />
Brachionus suggested about<br />
200/L in 2003, down from<br />
400/L in 1999, but higher<br />
than 100/L in 1990. A<br />
statistically significant<br />
linear increase was<br />
indicated over the entire<br />
study period (Table 12).<br />
Figure 124. Long term trend in Brachionus. Station 7. Gunston Cove.<br />
Brachionus (#/L)<br />
1000.0<br />
100.0<br />
10.0<br />
1.0<br />
Station 9: All Months<br />
0.1<br />
1985 1990 1995<br />
YEAR<br />
2000 2005<br />
In the river the LOWESS line<br />
for Brachionus suggested a<br />
continued decline to about<br />
40/L, below the peak of 80/L<br />
in 1999 (Figure 125).<br />
However, values seemed to<br />
fall into two groups: above<br />
200/L and below 20/L. A<br />
marginally significant linear<br />
increase was indicated over<br />
the entire study period (Table<br />
12).<br />
Figure 125. Long term trend in Brachionus. Station 9. River mainstem.
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