BACTERIAL ACTIVITY
Figure 2 : bacterial activity shown as a function
of % plateability and the number of colony forming units relative to the total AODC count. The
data were obtained from a 45 day incubation of
newly upwelled water in a 60 L. mesocosm which
simulated the processes occurring following an
upwelling event.
Profile
date
Depth
(m)
Irradiance
(%)
Bacterial production (mg.C.m -3 d 1 )
Predator-free 3 H-Thymidine mean ± S.D.
(a)
(b) (c)
of (a) + (b)
Phytoplankton
Production
(mg.C.m' 3 d -1 )
17.03.83
5
25.0
61.50
58.2-378.4
59.8+ 2.3
414.4
24
0.1
138.36
92.7-601.7
115.5 + 32.3
9.1
75
-
17.84
0.6- 3.7
17.8 ± -
-
19.03.83
8
25.0
40.73
61.6-401.1
54.0+ 11.6
54.9
59.84
20
10.0 (14 m)
20.61
40.4-262.6
31.8 ± 10.2
32.1 (14 m)
1.0(27 m)
34.56
2.9 (27 m)
60
-
5.58
12.8- 83.2
12.9+ 6.6
11.80
21.55
20.03.83
6.5 25.0
69.36
117.7-726.9
90.5 ± 29.9
155.6
22
1.0
28.92
26.4-171.3
27.6+ 1.8
7.2
75
-
5.59
4.7- 30.4
5.1 ± 0.7
-
Table 1 : estimates of bacterial and phytoplankton production. The 25 % irradiance depth corresponds to the
euphotic zone. Irradiance depths between 0.1 and 1 % correspond to the pycnocline region. Depths below that
are in the aphotic zone. The mean estimate of bacterial production is obtained from the predator-free (< 3 µm)
values and the lower estimate of production from the 3 H-Thymidine incorporation method. Daily phytoplankton production values were calculated for a 12 h daylight period and corrected for 10 % night respiration.
379
Figure 2 : bacterial activity shown as a function
of % plateability and the number of colony forming units relative to the total AODC count. The
data were obtained from a 45 day incubation of
newly upwelled water in a 60 L. mesocosm which
simulated the processes occurring following an
upwelling event.
Profile
date
Depth
(m)
Irradiance
(%)
Bacterial production (mg.C.m -3 d 1 )
Predator-free 3 H-Thymidine mean ± S.D.
(a)
(b) (c)
of (a) + (b)
Phytoplankton
Production
(mg.C.m' 3 d -1 )
17.03.83
5
25.0
61.50
58.2-378.4
59.8+ 2.3
414.4
24
0.1
138.36
92.7-601.7
115.5 + 32.3
9.1
75
-
17.84
0.6- 3.7
17.8 ± -
-
19.03.83
8
25.0
40.73
61.6-401.1
54.0+ 11.6
54.9
59.84
20
10.0 (14 m)
20.61
40.4-262.6
31.8 ± 10.2
32.1 (14 m)
1.0(27 m)
34.56
2.9 (27 m)
60
-
5.58
12.8- 83.2
12.9+ 6.6
11.80
21.55
20.03.83
6.5 25.0
69.36
117.7-726.9
90.5 ± 29.9
155.6
22
1.0
28.92
26.4-171.3
27.6+ 1.8
7.2
75
-
5.59
4.7- 30.4
5.1 ± 0.7
-
Table 1 : estimates of bacterial and phytoplankton production. The 25 % irradiance depth corresponds to the
euphotic zone. Irradiance depths between 0.1 and 1 % correspond to the pycnocline region. Depths below that
are in the aphotic zone. The mean estimate of bacterial production is obtained from the predator-free (< 3 µm)
values and the lower estimate of production from the 3 H-Thymidine incorporation method. Daily phytoplankton production values were calculated for a 12 h daylight period and corrected for 10 % night respiration.
379