OCR Text |
Show Breeding survey shows increase Aerial breeding ground surveys sur-veys over 198 square Vniles of Utah marshland show a marked increase in the number of waterfowl from a year ago. The recently completed aerial aer-ial survey showed a density of 50.8 ducks per square mile with a total of 5,518 birds observed ob-served in the State since 1956 when a total of 8,478 birds were counted on the same census cen-sus route. The , 1963 count was 1,500 birds higher than the 1962 survey conducted over the same Utah, Salt Lake, Davis, Weber and Box Elder county area. Significant increases in the waterfowl population were noted in Davis, Salt Lake and Weber counties with marked increases in the number of gadwall and redhead ducks. Counts are made by flying at an altitude of 150 to 200 feet along predetermined transect tran-sect lines one mile apart. Observers Ob-servers in the aircraft tally all birds within one-eighth of a mile of the line of flight to arrive at the population index. |