NEW: Annual Report - George Mason University

Adult and Copepodid Copepods (#/m3)
10000
1000
100
10
Station 7: All Months
1
1985 1990 1995
YEAR
2000 2005
Adult and copepodid
copepods remained constant
during 2003 continuing a
trend begun in the mid-1990’s
(Figure 147). The 2003 level
of about 1000/m 3 was well
above the initial level of
200/m 3 observed in 1990.
Copepods exhibited a
significant linear increase
over the study period (Table
12).
Figure 147. Long term trend in Adult and Copepodid Copepods. Station 7. Gunston
Cove.
Adult and Copepodid Copepods (#/m3)
10000
1000
100
10
Station 9: All Months
1985 1990 1995 2000 2005
YEAR
Adult and copepodid
copepods declined in 2003
continuing a trend begun in
1998 (Figure 148). The trend
line in 2003 reached 800/m 3 ,
well below the maximum of
3000/m 3 in 1998 and slightly
below the level of 1000/m 3 in
1990. There was no evidence
for a significant linear trend
when the entire study period
was considered (Table 12).
Figure 148. Long term trend in Adult and Copepodid Copepods. Station 9. River
mainstem.
105