Ch. 5— Wetland Trends • 95 



Table 14.— Physiographic Regions Used for Regional 

 Analysis of National Wetland Trends Study Data 



Region 



1— Atlantic coastal zone^ 



2— Gulf coastal zone'' 



3— Atlantic coastal flats^ 



4— Gulf coastal flats'" 



5— Gulf-Atlantic rolling plain 



6— Lower Mississippi Alluvial Plain 



7— Eastern tiighlands 



8— Dal<ota-Minnesota drift and lake bed flats 



9— Upper Midwest 

 10— Central 

 11— Rocky Mountains 

 12— Intermontane 

 13— Pacific mountains 



^Atlantic regions do not include Florida. 

 Gulf regions include Florida. 



SOURCE: Ollice of Technology Assessment. 



the region. Data from Minnesota more closely re- 

 flect the trends for the entire region. Minnesota lost 

 447,709 acres, or 8 percent, of wetlands in the up- 

 per midwest portion of the State. 



The proportion of wetlands and percentage of 

 loss vary considerably in the different physiograph- 

 ic regions (see table 15). Three regions have a 

 greater proportion of land area as wetlands and a 

 greater loss rate than the national averages of 5 per- 

 cent and 11 percent, respectively: Lower Mississip- 

 pi Alluvial Plain, gulf coastal flats, and gulf-Adantic 

 roUing plain. Five regions have a greater propor- 

 tion of land area as wetlands and loss rates at less 

 than or equal to the national averages: Adantic 

 coastal zone, gulf coastal zone, Adantic coastal flats, 

 Dakota-Minnesota drift and lakebed flats, and Up- 



Figure 9.— Physical Subdivisions 



Atlantic Coastal Zone 

 Gulf Coastal Zone 

 Atlantic Coastal Flats 

 Gulf Coastal Flats 

 Gulf-Atlantic Rolling Plain 

 Lower Mississippi Alluvial Plain 

 Eastern Higtilands 



Dakota - Minnesota Drift and Lake-bed Flats 

 9 Upper Midwest 



10 Central Hills and Plains 



11 Rocky Mountains 



12 Intermontane 



13 Pacific Mountains 



Scale 1-17,0X,000 

 100 200 300 400 lollies 



600 Kilometers 



