History and Ecology of the Canada Geese Wintering Near Rock Prairie, Wisconsin
Since 1960, the flock of giant Canada geese (Branta canadensis maxima)wintering at Rock Prairie, Wisconsin has declined from a mean of 3,000 in 1960-72 to 1,500-2,000 in 1973-74 and 1974-75. With the development of major concentrations of geese near the Horicon National Wildlife Refuge, 55 miles north, the use of Rock Prairie by migrating interior Canada geese (B.c. interior) in the fall has virtually ceased. Nesting habitat, mostly boreal forest on the Canadian shield in southeastern Manitoba, as a total environment, appears marginal. Breeding pair density observed on aerial surveys was 0.013 pairs per square mile.Leucocytozoon has been a major mortality factor of the goslings,claiming up to 50 percent of the annual production at the Alf Hole Provincial Sanctuary which supports the only known concentration of nesting geese associated with Rock Prairie. Hunting pressure has been intense in the Rock Prairie area and mortality at Rock Prairie has approached 10-15 percent of the ensui.
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70 days acres 5 acres Alf Hole Sanctuary average Bird Banding Laboratory birds Branta canadensis Brothers Flock Larkin Canadian Wildlife Service closed area comm corn corn corn counts decoys Evert DNR fall bandings feeding Figure Flock Larkin Brothers flock of giant food patch geese arrived geese banded geese began geese were observed geese wintering giant Canada geese goslings habitat Hanson l965 harvest Horicon Horicon Marsh hunters hunting pressure hunting season Lake Delavan Lake Koshkonong Lake Winnipeg Larkin Brothers Flock leased Manitoba March marked geese maxima migration Minnesota molt mortality neck banded geese November number of geese o o o o percent population Raveling Red-osier dogwood Rochester Rock Prairie area Rock Prairie Refuge roosting Shadel Shadel Shadel small flocks southeastern Wisconsin southern Illinois square mile Stuart Stuart Stuart subspecies Swan Lake Turtle Creek Walworth County weather Whiteshell Provincial Park Wildl winter flock wintering areas wintering at Rock