Exhibit 1 (Continued) 



y Vulnerability 



Vulnerability of wetlands in a delineation would not only include 

 present and potential threat to wetlands in future but also ease 

 of drainage, loss due to recreational development, housing subdi- 

 vision, severe siltation, extensive over-use from grazing and haying 

 pumping for irrigation, etc., all of which threaten the ability of 

 wetlands to produce waterfowl. 



2/ Species Composition 



High 



a. 30% breeding population composed of high category species or 

 known significant breeding use by species in this category"" 



b. At least one marsh of Class IV or exceptional Class III with 

 cover type 2 or 3 (Stewart & Kantrud-1971 ) . Marsh(es) must 

 be of significant size within delineation to have substantial 

 effect on waterfowl production, i.e. during drought years. ' 



Med. 



a. 50% breeding population composed of medium category species 

 (would include high category species when their total is less 

 than 30%) or known significant breeding use by above species. 



b. Priority should be given to a delineation with a variety of 

 potholes with all classes represented. 



Low 



a. Does not meet species criteria established for high or medium 

 rating. 



b. Same as Med. b. above. 

 y Production Capability 



Assumption is made that delineated area is optimal for area under 

 consideration and if acquired in fee would be managed to maximize 

 waterfowl production. 



High - 6+ ducks produced/delineated acre, or at least 1.6 nests/acre 

 with 70% nest success, or 30+ wetlands/square mile in wet 

 years. 



a. Divers: At least 20-80% of the delineated area are wetlands 

 and criteria of 2b apply. 



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