Standing Crops and Trophic Levels— -Blackburn 
49 
Fig. 5. Relationship between logarithm chlorophyll a (C) and logarithm copepods (H) 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 
0-300 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 H on C and the dashed lines (- — ) are the 95% confidence limits of the 
regression, both for the AB-36 series; the dotted-and-dashed lines are the 95% confidence limits of a 
similar regression for the AB-8 series. 
0.657 bb 0.263 (0.394 to 0.920). The fitted re- 
gression is shown in Figure 5 as a solid line 
and the 95% confidence limits of the relation- 
ship as dashed lines. 
Points within the confidence regions of re- 
gressions (8) and (2) were compared, as de- 
scribed above; 8 station-pairs, for which the ob- 
served H and M were both related to C in a way 
close to the real relationships, were identified. 
They were included in the 11 station-pairs for 
which similar statements were made about Z, 
M, and C, and are identified by plain circles in 
Figures 2, 3, 4, and 5; the other 3 station-pairs 
are identified by circles with enclosed dots. This 
set of data, i.e., of C, H, and M from the 8 
station-pairs, is henceforth called AB-8-H. 
Correlation coefficients in AB-8-H (Table 
3) include no significant partial coefficients, 
although r C h.m is very close to significance at the 
5% level of probability; all total coefficients are 
highly significant. The regressions on C for 
AB-8-H, corresponding to (8) and (2) for 
AB-36-H, are 
H = 0.5308 + 0.517 (C -1.4023) = -0.1942 
+ 0.517 C... (9) 
M = 0.8543 + 0.583 (C -1.4023) = 0.0368 
+ 0.583 C... (10) 
with 95% confidence limits of the regression 
coefficients respectively 0.250 zb 0.494 (-0.244 
to 0.744) and 0.558 ± 0.517 (0.041 to 1.075). 
The 95% confidence limits for the regression 
relationships are shown as dashed-and-dotted 
lines in Figures 4 and 5. 
