DEPTH IN METRES 



T 



Fig. 220 Variation of compensation point with depth and 

 temperature in Hormosira hanksii. (After Trevarthen.) 



sea 



12 3 4 

 DEPTH (metres) 



Scytosiphon 

 omentaria 



12 3 4 5 6 

 DEPTH (metres) 



2D 



Fig. 22 1 Rate of growth of various algae at different depths in sea 

 water. New Bnmswick. (After Klugh and Martin.) 



409 



