288 



WHITTAKER AND LIKENS 



"MIAMI" MODEL, 1971 

 Primary productivity, 

 predicted from 

 temperature and 

 precipitation ../"" 

 averages .-•'" 



' 



?S* 



PACIFIC OCEAN 



TROPIC OF CANCER 



EQUATOR 



TROPIC OF CAPRICORN 





!l !i:::!:::i!::::u:::::::::::: ::::::::::::::: 

 iii::i::::::|tr.M:«:::n:::::::::::::::::".:.. 



::i:!i::r.:::::::i:l.t>:f:::i::;:::::n::r.:::: 



i!nii;:!i;;;ipi::!;i;ii;i;;'ii:::!!ii:;|i:i::: 



:[»w;::::::::j::::i::::::;;;:: 



IE'. H: !'■:' :5 ., '' .'"^ 



-1";'iij;iiliijH::.'siS 



PACIFIC OCEAN 





LEVEL 



SYMBOLS 

 FREQUENCY 



■.. \ 



-1 



1 2 3 4 5 6 



FREQUENCY DISTRIBUTION OF DATA-POINT VALUES IN EACH LEVEL 



59 



97 



152 



262 



180 



146 



105 



both, then the land, much of which is desert, might be far less productive than 

 the sea as suggested by Riley. 53 The inference has proved lopsided; for if 

 productivity on much of the land is limited by drought and cold, productivity in 

 much of the sea is limited by nutrient poverty. The critical nutrients, 

 phosphorus and nitrogen, are carried downward by settling organisms and their 

 remains from the lighted, surface waters of the seas. The nutrients are thus 

 depleted in the photosynthetic levels of much of the open ocean. The 



