NEW: Annual Report - George Mason University

Leptodora (#/m3)
10000.0
1000.0
100.0
10.0
Station 7: All Months
1.0
1985 1990 1995
YEAR
2000 2005
Figure 142. Long term trend in Leptodora. Station 7. Gunston Cove.
Leptodora (#/m3)
1000
100
10
Station 9: All Months
1
1985 1990 1995
YEAR
2000 2005
Figure 142. Long term trend in Leptodora. Station 9. River mainstem.
In the cove Leptodora, the
large predaceous cladoceran,
remained fairly
steady in 2003 at about
200/m 3 , down from its high
of about 700/m 3 in 1994,
but well above the 1990
value of 10/m 3 (Figure 142).
There was good evidence
for a significant linear
increase in Leptodora over
the entire study period
(Table 12).
In the river, Leptodora
continued a decline which
began in 1995 and resulted in
trend line values of about
50/m 3 for 2003 (Figure 142).
These values are only slightly
higher than those observed in
1990. Linear regression
analysis did not detect a
significant linear trend when
the whole study period was
considered (Table 12).
103