Nitrogen 

 Fixation 



Other 

 Consumers 



Nutrient 

 Regeneration 



KEY 



a Energy > > » Wo 



Source j^ 



T 



j/\. Passive |>^V. 



\_/ Storage l^ 



I 



rkgate 



Consumer 



Plant 

 I J Popu- 



lations 



Sink 



(after Odum, 1971) 



(UoililUil liom Doy •! Hi , 1973) 



Seasonal 

 Triggers 



Figure 6. Master model AE4000: estuarine intertidal system - emergent wetland 

 (salinity modifier) 



26 



