Use of helicopters to estimate the population size of wild broods on interspersed marshes. RT Clay and JW Nelson
Material type:
TextPublication details: Manitoba - New Brunswick : 1987Online resources: Abstract: Ducks Unlimited Canada began an experiment in 1984 to devise a method of using helicopters to survey and estimate the numbers of broods inhabiting marshes with various types and degrees of interspersion. The study was conducted on 5 Manitoba Interlake and 10 New Brunswick marshes that were concurrently being surveyed as part of a Completed Projects Evaluation. Aerial (helicopter) and ground surveys were conducted independently, and the numbers of broods seen by each observer group were compared. Aerial and ground surveyors appeared to sample the same populations, because they reported similar species compositions, brood sizes and brood ages. The only exception occurred at NB floodplain wetlands in 1984 where brood movement may have affected the survey results. Aerial observers tended to see approximately 70% of the estimated number of broods present on Interlake and NB wetlands,yielding a correction factor of 1.43 which can be applied to aerial survey data to allow for unobserved bro
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Ducks Unlimited Canada began an experiment in 1984 to devise a method of using helicopters to survey and estimate the numbers of broods inhabiting marshes with various types and degrees of interspersion. The study was conducted on 5 Manitoba Interlake and 10 New Brunswick marshes that were concurrently being surveyed as part of a Completed Projects Evaluation. Aerial (helicopter) and ground surveys were conducted independently, and the numbers of broods seen by each observer group were compared. Aerial and ground surveyors appeared to sample the same populations, because they reported similar species compositions, brood sizes and brood ages. The only exception occurred at NB floodplain wetlands in 1984 where brood movement may have affected the survey results. Aerial observers tended to see approximately 70% of the estimated number of broods present on Interlake and NB wetlands,yielding a correction factor of 1.43 which can be applied to aerial survey data to allow for unobserved bro