f KplWlallOA ' HUM'S) •■IIWIMII 



N*«i0»lion cwisltlng 

 Land d«*«lo9MMiil 



Flahvrf 



Figure 7. The general wetland habitat model displays the major functional groups and major 

 processes occurring in wetland systems. Heat sinks representing energy loss are implied at 

 each interaction. 



Daily migrations 



^ Nulriani and lo>ln runoti 



^ NulrMnI and toxin tunoil 



Figure 8. The agricultural sector is much simplified ecologically, because cultural practices 

 subsidized by heavy fossil fuel and fertilizer inputs simplify the food chain. Heat sinks 

 representing energy loss are implied at each interaction. 



39 



