Migratory Bird Management
Geese Fall Count and Proportion of Young Survey
Since 1985, flocks of
emperor geese (Chen canagica) have been photographed from an airplane
during fall migration at lagoons along the north side of the Alaska Peninsula.
The gray head plumage of juvenile geese contrasted with the uniform white heads
of older geese making it possible to count the number of young and adults on the
photographs and calculate the proportion of young. In addition, an independent
shoreline aerial survey counted the number of geese at each lagoon. These 2 surveys
produced an annual estimate of proportion of young and total fall population size
which were used to monitor annual production and estimate average survival rate.
Results for these surveys are contained in the following report: Monitoring
Emperor Goose Populations by Aerial Counts and the Proportion of Young-Fall 2014 (pdf)
Last Updated: October 3, 2014