Standing Crops and Trophic Levels— -Blackburn 
47 
Fig. 4. Relationship between logarithm chlorophyll a (C) and logarithm carnivorous micronekton (M) 
for the 36 station-pairs of Table 1, A and B (AB-36 series). Antilogarithms are in mg/m 2 over 0-100 m 
and ml/10 3 m 3 over 0-90 m. Station-pairs in series AB-11 and AB-8 are identified as in Fig. 2. The solid 
line (— ) Is the fitted structural regression of M on C and the dashed lines (- — ) are the 95% confidence 
limits of the regression, both for the AB-36 series; the dotted lines and dashed-and-dotted lines 
are the 95% confidence limits of similar regressions for the AB-11 and AB-8 series. 
way as for the equations above, i.e., on the basis 
of C values. If points are grouped on the basis 
of Z values the corresponding coefficients are 
0.799 and 0.952. 
For the less numerous data of the Southern 
Hemisphere spring (Table 1, C), only the re- 
gression of Z on C is significant ( Table 3 ) - It Is 
Z = 1.8153 + 0.702 (C -0.8457) = 1.2195 
+ 0.702 C . . . (5) 
where 0.8457 and 1.8153 are means of C and Z, 
with antilogarithms 7.06 mg/m 2 of chlorophyll 
a and 65.39 mi/10 3 m 3 of zooplankton; the anti- 
logarithm of mean M for this series of station- 
pairs is 337 ml/10 3 m 3 . Mean C is much lower 
than in AB-36-Z, reflecting the shorter water 
column over which it was measured. The 95% 
confidence limits of the regression coefficient 
are 0.701 ± 0.359 (0.342 to 1.060). 
For the still less numerous data of the North- 
ern Hemisphere winter (Table 1, D), neither Z 
nor M have a significant regression on C (Table 
3 ) . This may reflect the small n ( = 14) and the 
narrow range of C; the latter is 1.3222-2.0294, 
which may be compared with 0.2553-1.5315 for 
18 differently-measured observations in Table 1, 
C and 0.6812-2.0792 for 36 similarly -measured 
observations in Table 1, A and B. The difference 
in range of C may be explained by the fact that 
the data of Table 1, D are all from inshore 
localities (Fig. 1 ) ; the other two series are from 
both inshore and offshore locations (Fig. 1 ) , 
where C values tend to be high and low respec- 
tively ( Fig. 2 ) . 
