US Fish & Wildlife Service

 

Date of this Version

7-25-2007

Citation

U.S. Fish and Wildlife Service. 2007. Waterfowl population status, 2007. U.S. Department of the Interior, Washington, D.C. U.S.A.

Abstract

Table of Contents

ACKNOWLEDGMENTS.............................................................................. 2

Status of Ducks

METHODS ....................................................................................... 5

RESULTS AND DISCUSSION..................................................7

REFERENCES.......................................................... 30

Status of Geese and Swans

METHODS ........................................................................................ 32

RESULTS AND DISCUSSION.............................................................. 34

Appendices

Appendix A. Individuals who supplied information on the status of ducks ....................................... 48

Appendix B. Individuals who supplied information on the status of geese and swans..................... 50

Appendix C. Strata and transects of the Waterfowl Breeding Population and Habitat Survey......... 52

Appendix D. Estimated number of May ponds and standard errors in portions of Prairie and Parkland Canada and the northcentral U.S. ......................................................................... 53

Appendix E. Breeding population estimates for total ducks and mallards for states, provinces, or regions that conduct spring surveys ................................................................................. 54

Appendix F. Breeding population estimates and standard errors for 10 species of ducks from the traditional survey area ............................................................................................ 56

Appendix G. Total breeding duck estimates for the traditional survey area, in thousands............................................................................................................................. 58

Appendix H. Breeding population estimates and 90% confidence intervals or credibility intervals For the 10 most abundant species of ducks in the eastern survey area……………………..59

Appendix I. Abundance indices for North American Canada goose populations, 1969-2007.......... 60

Appendix J. Abundance indices for light goose, greater white-fronted goose, brant, emperor goose, and tundra swan populations during 1969-2007......................... 61

List of Duck Tables

Table 1. Estimated number of May ponds in portions of Prairie and Parkland Canada and the northcentral U.S. ................................................................................... 9

Table 2. Total duck breeding population estimates .......................................................................... 12

Table 3. Mallard breeding population estimates ............................................................................... 13

Table 4. Gadwall breeding population estimates.............................................................................. 18

Table 5. American wigeon breeding population estimates ............................................................... 18

Table 6. Green-winged teal breeding population estimates ............................................................. 19

Table 7. Blue-winged teal breeding population estimates ................................................................ 19 Table 8. Northern shoveler breeding population estimates .............................................................. 20

Table 9. Northern pintail breeding population estimates .................................................................. 20

Table 10. Redhead breeding population estimates .......................................................................... 21

Table 11. Canvasback breeding population estimates ..................................................................... 21

Table 12. Scaup (greater and lesser combined) breeding population estimates ............................. 22

Table 13. Duck breeding population estimates for the 10 most abundant species in the eastern survey area .................................................................... 22

List of Duck Figures

Figure 1. Number of ponds in May and 90% confidence intervals for Prairie and Parkland Canada and the northcentral U.S. ..................................................................................... 9

Figure 2. Breeding population estimates, 90% confidence intervals, and North American Waterfowl Management Plan population goal for selected species for the traditional survey area ......................................................................................... 15

Figure 3. Breeding population estimates and 90% credibility intervals for selected species in the eastern survey area ...................................................................................................... 28

Figure 4. Breeding population estimates and 90% confidence intervals for selected species in the eastern survey area ...................................................................................................... 29

Figure 5. Estimates and 90% confidence intervals for the size of the mallard population in the fall.................................................................. 30

List of Goose and Swan Figures

Figure 1. Important goose nesting areas in arctic and subarctic North America ............................. 33

Figure 2. Snow and ice cover in North America for spring ............................................................... 34

Figure 3. Approximate ranges of Canada goose populations in North America............................... 35

Figures 4-18. Indices to Canada goose populations’ status ............................................................ 34-41

Figure 19. Approximate ranges of selected goose populations in North America............................ 42

Figures 20-27. Indices to selected goose populations’ status ......................................................... 43-47

Figure 28. Approximate range of Emperor goose and tundra swan populations in North America ....................................................................................................................... 47

Figure 29. Indices to tundra swan populations’ status...................................................................... 47



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