Seasonal Studies of a Pelagic Ecosystem (Meridian 110
0
E)
495
Table 1 (continued)
Primary Productivity
3
26
41
58
53
60
(mgC m- 2 h- 1 )
Chlorophyll a (mg m -2)
18118
13/12
26/27
20118
20/22
14/14
Chlorophyll c (mg m- 2 )
48/39
33/27
40/45
54/48
61167
42143
Inorganic Nitrate (,ug-at 1- 1 )
6.02
6.02
7.53
5.13
6.55
5.33
Inorganic Phosphate
0.65
0.60
0.62
0.56
0.62
0.75
(,ug-at 1- 1 )
(b) Subtropical Zone
(South of 18
0
S.)
Zooplankton Biomass
41151
44/ 53
21 / 35
28/ 58
46/ 72
43176
Total MWf Catch
10.07
12.86
8.21
11.51
13.62
16.76
MWf Zooplankton
1.97
2.04
1.64
1.94
3.27
4.93
MWf Macroplankton
2.74
2.54
2.36
2.91
4.51
3.39
MWf Micronekton
4.76
7.99
3.93
6.21
4.73
7.97
Primary Productivity
4
26
32
40
44
53
Chlorophyll a
15/ 13
11 / 12
23 / 25
20/ 21
21/21
13/ 13
Chlorophyll c
39/ 38
27/ 26
47/ 61
58 / 57
61/71
37/ 33
Inorganic Nitrate
1.08
1.03
1.58
1.41
0.93
0.78
Inorganic Phosphate
0.28
0.28
0.34
0.30
0.29
0.32
Table 2. Standing stock and turnover of C at various trophic levels, with respect to phytoplankton
carbon
Biological Property
Carbon Equivalent
Percentage of Phytoplankton
Annual
Standing Stock
Mean
j-F M-AM-j j-A A-S O-N
1963 1963 1963 1963 1962 1962
(a) Tropical Zone
Total Particulate Carbon Direct Measure
260 430 246 289
306
Phytoplankton
(mg m- 2 Chlorophyll a) 100 100 100 100 100 100 100
X50
Zooplankton
(mg m- 2 Wet Weight)
58
71
28
73
62
39
55
X .03
Micronekton
(mg m- 2 Dry Weight)
2.5
6.0
2.9
2.5
3.0
5.7
3.8
X .50
Carbon Fixation:
Direct Measure
Simulated in situ (per day)
11
13
13
34
10
10
15
Artificial light (per hour)
0.3
4.3
3.0
6.4
4.8
8.6
4.6
(b) Subtropical Zone
Total Particulate Carbon As above
455 347 272 269
336
Phytoplankton
As above
100 100 100 100 100 100 100
Zooplankton
As above
47
53
17
.33
41
70
43
Micronekton
As above
3.7
6.7
1.6
3.0
2.3
6.1
3.9
Carbon Fixation
As above
Simulated in situ (per day)
14
15
10
15
11
12
13
Artificial light (per hour )
0.6
4.3
2.6
3.8
4.2
8.2
3.9