29 Causes of recent wetland losses (mid-1950's to mid-1970's) in the 

 conterminous U.S.; losses to agriculture are highlighted 32 



30 Historical losses of wetlands in Iowa and California 33 



31 Rates of coastal wetland loss in the conterminous U.S 36 



32 Filling of estuarine wetlands for residential housing in Long Island, New 



York, and other coastal areas was particularly heavy in the 1950's and 1960"s 37 

 i3 The status of wetland filling and diking in San Francisco Bay prior to the mid- 



I960's 36 



34 Louisiana's coastal marshes are being permanently flooded by Gulf of Mexico 

 waters at an accelerating rate 38 



35 Chesapeake Bay and its major tributaries 39 



36 Chesapeake Bay is one of the more important wintering areas for canvasbacks 



in North America 39 



37 Channelization of the Kissimmee River directly destroyed many wetlands and 

 facilitated drainage of more than 100,000 acres of wetlands 40 



38 Present extent of wetlands in the Florida Everglades; former wetlands are also 

 shown 41 



39 Prairie pothole wetlands are the Nation's most valuable waterfowl production 

 areas 42 



40 Original extent and distribution of Minnesota's wetlands 44 



41 Present extent and distribution of Minnesota's wetlands 45 



42 Prairie pothole wetlands continue to be drained for agriculture 46 



43 Sandhill cranes on a Platte River roost at sunrise 47 



44 Actual and projected losses in bottomland forested wetlands of the Lower 

 Mississippi Alluvial Plain 48 



45 Bottomland wetlands are being channelized, clearcut and converted to 

 agricultural uses in many areas of the Southeast 49 



46 Most of the Nation's pocosin wetlands occur along the coastal plain of North 

 Carolina 49 



47 Comparison of the extent of natural or only slightly modified pocosins in 



North Carolina, (a) early I950's and (b) 1980 50 



48 Riparian wetlands along rivers and lakes are important to many forms of 

 wildlife in the West 51 



49 Establishing waterfowl production areas is one way that the Service protects 

 important waterfowl breeding habitat 55 



50 Current status of state wetland protection efforts 56 



