Depth In meters 
142 
PACIFIC SCIENCE, Vol. XVII, April 1963 
( V 
* \ *4\ U.l^ 
\ 3 
1.2 
* \ A ^ 
1-0 
V .7 
^.5 
- \<4 
.1 
— .25 
S .hemiphyllum 
a 1 
\ 
Wave action 
Fig. 8. Population nomograms for six major species of Sargassum. 
this survey was made, all the species of Sargas- 
sum found in the subtidal region formed but a 
single upper layer, and there was no constituent 
in this layer other than Sargassum . Katada re- 
ported that Undaria pinnatifida may also be in- 
cluded in this layer, intermingled with Sargas- 
sum. 
As already pointed out, in reference to the 
population nomograms in Figure 8, the Sar- 
gassum community appears to form a contin- 
uum. This is confirmed by the application of 
Goodall’s objective method of classification. 
Hence it is desirable that our attention be cen- 
tered on the distribution of each species popu- 
