. Bulletin. Natural history; Natural history. November, 1944 Bellrose: Duck Populations and Kill 359 expression was that the half hour before sunrise shooting was very detrimental to hunting. Some hunters who expressed a prefer- ence for shooting hours of sunrise to sunset explained that waterfowl oc- curred on their property only at sunrise and sunset. The principal reason ad- vanced by hunters for ending shooting daily at 4 , , was that it kept waterfowl from being "burned out" of a region. Have longer shooting hours resulted in a greater kill of waterfowl ? Shooting hour
. Bulletin. Natural history; Natural history. November, 1944 Bellrose: Duck Populations and Kill 359 expression was that the half hour before sunrise shooting was very detrimental to hunting. Some hunters who expressed a prefer- ence for shooting hours of sunrise to sunset explained that waterfowl oc- curred on their property only at sunrise and sunset. The principal reason ad- vanced by hunters for ending shooting daily at 4 , , was that it kept waterfowl from being "burned out" of a region. Have longer shooting hours resulted in a greater kill of waterfowl ? Shooting hour regulations are difficult to evaluate because of the influence of such other variables as length of season, population, weather and food conditions. Length of seasons has changed with shooting hours; so in order to reduce the influence of varying lengths of seasons, as well as variations in the duck flight, the per- centage of the 5-year duck population present during the open season of each year has been compared with the per- centage of the 5-year kill, table 10, to give an index of the shooting pressure resulting from various shooting hours. The highest index numbers indicate the greatest shooting pressure and kill. Because of better hunting conditions in certain years than in others the data are inconsistent, but they show no evi- dence that larger kills were made in seasons of sunrise or sunset shooting than in seasons of shorter shooting days. The index figure for 1940, when sunrise shooting was permitted, was the same as for 1939, with 7 shooting, table 10. In 1941 and 1942, with sun- rise shooting, the shooting pressure, a measure of the comparative kill, was actually less than that with 7 , , shooting in 1938 and 1939. Effect of Bag Limit In recent years, several biologists have questioned the value of bag limit as an effective measure jn restricting the total'game kill. Fig. 22, based on data assembled by Dr. Yeatter and Dr. Thompson, shows for most ye
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