IV-92 



As an illustration of the relationships of these groupings, consider 

 the ways to classify a group composed of all the deliverymen in the 

 United States. They work 1n 50 States (the biophysical regions); 

 they work 1n cities, towns, and rural areas (the morphological classi- 

 fication); they deliver different kinds of things, such as groceries, 

 clothes, furniture, and hardware (the ecosystems). 



Each of these different groupings of the estuarlne zones 1s signifi- 

 cant to management. The biophysical regions are contiguous geographic 

 zones with similar general environmental conditions that would be 

 appropriate for an Institutional management unit. The morphological 

 grouping can serve as a guide to useful physical modification and 

 necessary waste treatment, while the ecological grouping tells what 

 can and can't be done with the living resource. 



