PLANKTON I N NITROUEN AND PHOSPHORUS CYCLES
169
GROWTH EFFICIENCIES OF ZOOPLANKTON
Stage of
development
CIV
cv
CIV
cv
Nauplii
CI
CII
CIII
CI v
cv
Nauplii
CI
CII
CIII
CIV
cv
Egg product.ion
Egg production
Growth to adult
Growth + egg production
Egg production
Growth to adult
Growth to adult
V's and adults
(spring weight increase)
V's and adults
(spring weight increase)
Growth + egg production
by " average " female
Growth + egg production
by " average " female
Growth + egg production
Growth to adult
Growth from 3-5 cm
diameter
Young stages
K1
~
__
3.7-13
13.e36.4
5-18
18-50
14
17
16
23
16
11
1
34
50
39
28
21
5
2
34
24
14
33.1
28.3
26.8
17.2
40
40.3
34.7
24.9
28.2
11.0
37
yo Aaaimilnletl
inetubolired
K ,
food
Reference
16.6
40.5
23.0
68.0
17
21
21
29
20
14
37
55
43
31
23
6
2.5
3 8 4
2.0
-
-
-
-
43
22.4
54
54.5
47.0
33.6
11.1'
-
-
83.4
59.5
77.0
42.0
83
79
79
71
80
86
98
63
45
57
79
77
94
97.5
81.4
-
-
-
-
57
77.6
46
45.5
53.0
66.4
72.3
-
-
Conover ( 1964)
Conover (1964)
Conovcr (1964)
Conover (1964)
retipa (1967)
Petipa (1967)
Petipa (1967)
Potipa (1967)
Petipa (1967)
Petipa (1967)
Petipa (1967)
Petipa (1967)
Petipa (1967)
Petipa (1967)
Petipa (1967)
Petipa (1967)
Petipa (1967)
Petipa (1967)
Corner el al. (1967)
Corner et al. (1967)
Corner et al. (1987)
Butler et al. (1969)
Butler et al. (1969)
Butler et al. (1 970)
Butler et al. (1970)
Pavlova (1967)
Pavlova (1967)
Pavlova (1967)
Pavlova (1967)
Lasker (1966)
Reeve (1968)
Freser (1969)
Where a, and a4 were the N : P ratios by weight in plant food and faecal
pellets respectively, a3 was the N : P ratio for additional growth by the
animals during this period, and rn was the ratio K,(N) :K,(P).
As a percentage, D p was found t o be 77% and DN (percentage
assimilation of nitrogen) was then calculated from the equation