A new study conducted by the Michigan Department of Natural Resources and published in the February 2008 issue of Journal of Wildlife Management reveals that "resident" Canada geese that fail to produce offspring will molt migrate to Canada. The Michigan study, titled Movements and Survival of Molt Migrant Canada Geese in Southern Michigan, took place between 2000 and 2003. The authors destroyed the nests of 168 radiomarked females by removing eggs after day 14 of incubation, and left nests of 82 incubating hens undisturbed after capture and marking. Of females whose nests were experimentally destroyed, 80% subsequently migrated from breeding areas to James Bay and other areas of Canada.
Nest destruction can induce molt migration, increase hunting mortality of geese returning from molting areas, and reduce human–goose conflicts, but managers also should consider potential impacts of increasing numbers of molt migrants on populations of subarctic nesting Canada geese.
The GeesePeace protocol calls for oiling eggs as opposed to destroying nests, but the effect is the same: with no goslings to tether them to their breeding area, "resident" geese will migrate north. In addition to having fewer geese on our fields and in our parks during the Summer, the migrating geese will be exposed to hunting along migratory routes, which may reduce the number of geese returning in the fall.
If you're interested in reading the study, download a copy here.
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