. Bulletin. Natural history; Natural history. 342 Illinois Natural History Survey Bulletin Vol. 2j, Art. 2 prior to the opening of the hunting season. A greater proportion of the flight was present during the open seasons of 1938 and 1941 than during the other three seasons. Table 8 shows for 1938 and 1941 the highest shooting pressure quotients for this species. Second among the species most fa- vored in Illinois by the established open seasons, 1938-1942, was the shoveler. As shown by fig. 8 and figs. 11-15, much of the shoveler migration in this state occurred before the season opened. A la
. Bulletin. Natural history; Natural history. 342 Illinois Natural History Survey Bulletin Vol. 2j, Art. 2 prior to the opening of the hunting season. A greater proportion of the flight was present during the open seasons of 1938 and 1941 than during the other three seasons. Table 8 shows for 1938 and 1941 the highest shooting pressure quotients for this species. Second among the species most fa- vored in Illinois by the established open seasons, 1938-1942, was the shoveler. As shown by fig. 8 and figs. 11-15, much of the shoveler migration in this state occurred before the season opened. A larger proportion of the population of this species than of any other species, except the blue-winged teal, passed south before opening day. Data in table 8 disclose that extending the season to 60 days in 1940 and 70 days in 1942 did not increase the shooting pressure quo- tient for this species in those years. Figs. 11-15 reveal that much of the green-winged teal flight, like that of the blue-winged teal and shoveler, had passed through Illinois by opening day, 1938-1942. Table 8 shows that the green-wing was the third most favored species. High water in 1941 caused a large part of the green-winged teal flight to leave the Illinois River valley earlier than usual. In that year, green- wings were under less shooting pressure than in other years and were next to the blue-winged teal in being little af- fected by the open season, table 8. Next to the blue-winged teal, the pintail was, in the years of this study, the earliest migrant to arrive in Illinois, fig. 9. However, because greater pro- portions of its flight occurred during the hunting season, figs. 11-15, the pintail was subject to more shooting pressure than either of the teals or the shoveler, table 8. High water in 1941 resulted in a mass exodus of pintails from the Illinois River valley early in October, accounting at least in part for a low shooting pressure in that year, table 8 and fig. 14. While the 1942 flight was
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