92
L. B. SLOBODKIN
F
FIQ. 5. The relation between P , and F i n Hydra oligactis populations. The line is from
Eq. (IS). Four multiples of a base food supply were used.
I
+
4
D
5
.
F
Fro. 6. Maximum estimates of ecological efficiency of Daphnia pulez populations r18
a function of F . The lower line represents removal of young.