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Distribution and Abundance of Predators that Affect
Duck Production: Prairie Pothole Region

Appendix


Table 13. Average number of places per hour (observation rate) where one or more individuals of each avian predaotr species and species-group were seen instudy aeas in the prairie pothole region, 1983-88.a

Areab Year Observer Hours Observation Rate (x103)
American Crowc Black-billed Magpiec Large Hawksc,d Great Horned Owl
Canada
Alberta
Gayford 1985 822 1814 1849 1805 6
Hay Lakes* 1983 888 1805 1776 1938 26
1984 1085 1795 1527 1686 20
Holden* 1983 830 2938 1717 1761 15
Penhold* 1984 762 1785 2001 1880 17
1985 769 2046 2211 1835 22
Manitoba
Cartwright 1983 586 2135 1694 1629 7
Moore Park* 1983 774 1937 1523 1677 39
1984 920 2066 1129 2050 47
Saskatchewan
Ceylon 1983 935 1560 17 1693 16
1984 608 1670 0 1920 7
Craik 1984 606 2012 1650 1702 13
1985 636 2087 1061 1829 17
Denzil 1984 870 1768 1179 1793 16
1985 1084 1717 772 1835 6
Earl Grey* 1985 868 2148 1313 1840 16
Goodwater 1983 825 1760 282 1908 14
Hanley* 1983 867 2283 1816 2058 16
1984 852 2021 1475 1712 14
1985 1215 2195 1417 1629 17
Inchkeith* 1984 624 2158 2077 2116 24
1985 813 1727 1667 1747 14
Leask* 1984 1167 1755 558 1767 7
1985 1403 1681 486 1642 2
Shamrock 1983 950 1693 155 1720 10
1984 561 2065 193 1835 36
1985 547 2062 113 2131 15
Yorkton* 1985 1087 1650 1012 1677 9
United States
Minnesota
Hawley* 1987 859 54 0 146 21
1988 718 164 0 181 18
Hitterdal* 1988 1251 155 1e 129 14
Lake Park* 1987 875 174 0 101 31
1988 731 349 0 231 21
Montana
Morgan 1983 290 107 0 1852 0
Plentywood 1983 435 1338 36 1766 0
North Dakota
Courtenay 1988 469 2 0 207 19
Eldrige 1987 932 2 0 156 48
1988 286 10 0 462 63
Fredonia 1987 1456 2 0 504 9
1988 776 3 0 601 15
Jud 1987 798 19 0 358 20
1988 365 22 0 438 60
Kulm 1988 1668 47 0 482 11
Litchville 1987 910 2 0 193 13
1988 355 8 0 535 31
Plaza 1983 453 241 0 1249 11
Sharon 1983 514 317 0 1176 2
Streeter 1983 416 75 0 1697 10
South Dakota
Hosmer 1983 431 1187 36 2504 7
Madison 1983 471 1648 0 1647 19
Parkston 1983 458 508 0 1475 0

aA place is defined as 0.4 ha.
bStudy areas denoted with an (*) asterisk are in the aspen parkland, all others are in the prairie.
cData collected in 1983-1985 cannot be compared with data collected in 1987-88 because of differences in recording procedures (see Recording Sightings of Predators section).
dNearly all were northern harriers, Swainson's hawks, red-tailed hawks, and ferruginous hawks.
eRepresented the sighting of a single black-billed magpie by one person.


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