Rico are related to population status and habitat 

 requirements. 



1971 1972 1973 



$0.64 $0.54 $0.56 



Smithsonian Institution.— The National Museum of 

 Natural History has detailed information on the 

 distribution and abundance of rare and exotic species 

 from various ecosystems and is the major repository of 

 specimens supporting this information. The National 

 Zoo is involved in rearing and maintaining many rare 

 and exotic species. The National Museum and the 

 Ecology Program are making lists of the rare and 

 endangered species of plants for the Pacific Basin and 

 the United States and studying the reasons for rarity 

 and endangerment. 



1971 1972 1973 



$0.20 $0.20 $0.25 



Department of Agriculture.— Exotic species may be 

 resistant to disease and insect attacks which ruin 

 native species of the same genus. Resistant exotics may 

 be crossbred with native species to produce resistant 

 hybrids or, if suitable, can be substituted for the native 

 species. Plants are being tested for adaptation to 

 special purposes including shelterbelts in the Great 

 Plains, Christmas trees, timber, and ornamentals for 

 urban planting. Selected species must thus be adapted 

 to the soil and climate of an area and resistant to 

 indigenous insects and disease. 



1971 1972 1973 



$0.31 $0.37 $0.42 



National Science Foundation.— Occasional grants 

 are supported to examine ecology of rare, endangered or 

 imported species. 



1971 1972 1973 



$0.07 $0.06 



d. Wildlife management 



Department of Agriculture.— The two principal 

 means of managing wildlife populations are regulation 

 of hunting and fishing and manipulation of wildlife 

 and fish habitats. Research includes work on 

 manipulation of vegetation that provides food and 



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