U.S. Fish & Wildlife Service A Review of the Status of Greater and Lesser Scaup In North America Note: Due to the complexity of some of the graphics and equations in this report, not all converted to portable document format clearly. We are working on correcting this problem. Scroll to next page to view report. % 56 63 70 77 84 91 98 Year 0 100 200 300 400 500 600 700 800 Thousands Population Estimate 56 63 70 77 84 91 98 Year 0 1 2 3 4 5 6 7 8 9 10 Millions Population Estimate 61 66 71 76 81 86 91 96 Year 0 50 100 150 Thousands Harvest - U.S. 0 1 2 3 Immatures/Adult Ratio 61 68 75 82 89 96 Year 0 20 40 60 80 Thousands Harvest 0 1 2 3 4 5 Immatures/Adult Ratio Atlantic Flyway 61 68 75 82 89 96 Year 0 20 40 60 80 Thousands Harvest 0 1 2 3 4 5 Immatures/Adult Ratio Mississippi Flyway 61 68 75 82 89 96 Year 0 20 40 60 80 Thousands Harvest 0 5 10 15 20 25 30 Immatures/Adult Ratio Central Flyway 61 68 75 82 89 96 Year 0 20 40 60 80 Thousands Harvest 0 2 4 6 8 Immatures/Adult Ratio Pacific Flyway 61 66 71 76 81 86 91 96 Year 0 100 200 300 400 500 600 700 800 Thousands Harvest - U.S. 0 1 2 3 Immatures/Adult Ratio 61 68 75 82 89 96 Year 0 100 200 300 400 500 Thousands Harvest 0 1 2 3 4 5 6 Immatures/Adult Ratio Mississippi Flyway 61 68 75 82 89 96 Year 0 100 200 300 400 500 Thousands Harvest 0 1 2 3 4 5 6 Immatures/Adult Ratio Atlantic Flyway 61 68 75 82 89 96 Year 0 100 200 300 400 500 Thousands Harvest 0 1 2 3 4 5 6 Immatures/Adult Ratio Central Flyway 61 68 75 82 89 96 Year 0 100 200 300 400 500 Thousands Harvest 0 1 2 3 4 5 6 Immatures/Adult Ratio Pacific Flyway 69 72 75 78 81 84 87 90 93 96 Year 0 0.5 1 1.5 2 2.5 Sex Ratio 69 72 75 78 81 84 87 90 93 96 Year 0 0.5 1 1.5 2 2.5 Sex Ratio Atlantic Flyway 69 72 75 78 81 84 87 90 93 96 Year 0 0.5 1 1.5 2 2.5 Sex Ratio Mississippi Flyway 69 72 75 78 81 84 87 90 93 96 Year 0 0.5 1 1.5 2 2.5 Sex Ratio Pacific Flyway 69 72 75 78 81 84 87 90 93 96 Year 0 1 2 3 4 Sex Ratio Atlantic Flyway 69 72 75 78 81 84 87 90 93 96 Year 0 1 2 3 4 Sex Ratio 69 72 75 78 81 84 87 90 93 96 Year 0 1 2 3 4 Sex Ratio Mississippi Flyway 69 72 75 78 81 84 87 90 93 96 Year 0 1 2 3 4 Sex Ratio Central Flyway 69 72 75 78 81 84 87 90 93 96 Year 0 1 2 3 4 Sex Ratio Pacific Flyway 60 65 70 75 80 85 90 95 Year 0 1 2 3 4 5 6 7 8 9 Millions Hunter Days Atlantic Mississippi Central Pacific 61 68 75 82 89 96 Year 0 100 200 300 400 500 600 700 800 Thousands Scaup Harvest 4 6 8 10 12 14 16 18 Millions Hunter Days Greater Scaup Harvest Lesser Scaup Harvest Hunter Days . 69 78 87 96 Year 0 50 100 150 Thousands Harvest - Canada 0 1 2 3 4 5 Immatures/Adult Ratio 69 78 87 96 Year 0 50 100 150 Thousands Harvest - Canada 0 1 2 3 4 5 Immatures/Adult Ratio 74 78 82 86 90 94 Year 0 50 100 150 200 250 Thousands Greater Scaup Harvest Canada United States 74 78 82 86 90 94 Year 0 100 200 300 400 500 600 700 800 900 Thousands Lesser Scaup Harvest Canada United States 74 78 82 86 90 94 Year 0 20 40 60 80 100 Percent Greater Scaup Harvest Canada United States 74 78 82 86 90 94 Year 0 20 40 60 80 100 Percent Lesser Scaup Harvest Canada United States 55 62 69 76 83 90 97 Year 0 500 1000 1500 2000 2500 3000 3500 Thousands Pacific Central Mississippi Atlantic N $ $ $ N N J 3 4 5 6 7 0.1 0.2 0.3 0.4 0.5 Spring Population Estimate (Millions) Variance N $ $ ( $ $ 1960 1970 1980 1990 3 4 5 6 7 1961–1998 Multiplicative Model Population (millions) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1960 1970 1980 1990 3 4 5 6 7 1983–1998 Multiplicative Model Population (millions) . . . . . . . . . . . . . . . . o Observed Estimates Smoothed Estimates 95 Percent CIs 1960 1970 1980 1990 3 4 5 6 7 1983–1998 Arithmetic Model Year Population (millions) . . . . . . . . . . . . . . . . N $ N N N N N N N N N N N N
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A review of the status of greater and lesser scaup in North America 
