Fall Flock Behavior and Harvest of Canada Geese

Abstract

We studied fall flock behavior and harvest of locally breeding Canada geese (Branta canadensis) and those that use the area as a migration stopover at the Talcot Lake Wildlife Management Area (TLWMA) in southwest Minnesota in 1980-81. We used neckbands and radio transmitters to measure movements and survival of geese. We conducted aerial and ground surveys to estimate the size of goose populations. The 800-ha TLWMA refuge provided hunting season sanctuary for geese breeding in a 1,500-km2 area surrounding the refuge. Fidelity of local geese to feeding and roosting sites was strong throughout the fall. Prehuntingseason flight patterns to feeding sites off the refuge continued despite heavy hunting pressure. Marked families from a given brood-rearing site fed and roosted together at rates greater than would have been expected by chance. This subflock behavior, combined with consistent flight patterns, resulted in differential mortality among brood-rearing groups. In contrast, migrants remained at TLWMA briefly, fed independently from local geese when off the refuge, and were harvested at a lower rate (P < 0.05) than local geese. J. WILDL. MANAGE. 52(4):679-688 The giant Canada goose (B. c. maxima) has been restored over much of its former midwestern range (Nelson 1963, Brakhage 1965, Dill and Lee 1970, Cooper 1978). This race has steadily increased to an estimated 108,000 birds in the Mississippi Flyway in 1981 (U.S. Fish and Wildl. Serv. and Can. Wildl. Serv. 1982). Although less numerous than subarctic and arctic goose populations (Bellrose 1976), resident populations of giant Canada geese provide recreation where geese were once rare or absent (Hine and Schoenfeld 1968). Management programs for local geese have included establishing additional populations, improving breeding habitat, and establishing refuges. Refuges have also contributed to an increase in subarctic and arctic nesting Canada geese stopping in the upper midwest (Vaught and Kirsch 1966, Reeves et al. 1968). Concurrent use of refuges by migrant geese and locally breeding geese is common. Goose concentrations on refuges have resulted in high hunter densities, firing lines, and crop depredations. These issues, and a goal to apportion the harvest of geese equitably in the Mississippi Flyway, have led to a search for methods to distribute migrant geese (Reeves et al. 1968). Sherwood (1968) identified hunting as an important limiting factor for restored populations; therefore, techniques are needed for managing the harvest of migrant and locally breeding geese concurrently using a refuge. An understanding of the behavior of migrant and resident geese during fall is necessary to attain this objective. Migratory and wintering subpopulations or subflocks of Canada geese have been described by Kennedy and Arthur (1974), Koerner et al. (1974), and Raveling (1969, 1978, 1979). Zicus (1981a) documented subflock behavior on the breeding grounds in summer and fall. Zicus (1981a) suggested that resident geese rearing young at specific sites associated with each other and differed from other subflocks in their use of a refuge for feeding and roosting; he speculated that subflocks may differ in their vulnerability to hunting. Our study examined behavior of resident and migrant Canada geese using a refuge concurrently during fall in southwest Minnesota. We studied chronological changes in size and composition of migrant and local flocks, use of feeding sites, family associations and mortality rates among local geese, composition of the Canada goose harvest, and factors affecting vulnerability of these geese to hunting. We thank J. R. Kitts and F. B. Martin, University of Minnesota, for reviewing the manuscript and for assisting with statistical procedures, respectively. R. J. Peterson, J. G. Beech, D. G. Opdahl, L. M. Koster, E. L. Larson, and other personnel of the Minnesota Department of Natural Resources (MDNR) helped with banding, observations, and bag checks. Additional banding assistance was provided by S. J. 1 Present address: Section of Wildlife, Minnesota Department of Natural Resources, 231 E. Second Street, Redwood Falls, MN 56283.