Composite analysis of black duck breeding population surveys in Eastern North America. Zimmerman, G., S., Sauer, J., R., Link, W., A., & Otto, M. Journal of Wildlife Management, 76(6):1165-1176, 2012. abstract bibtex Waterfowl are monitored in eastern Canada and the northeastern United
States with 2 surveys: a transect survey from fixed-wing aircraft and a
plot survey conducted from helicopters. The surveys vary in extent, but
overlap exists in a core area of 9 strata covering portions of all
provinces from Ontario east to Newfoundland. We estimated population
change for American black ducks (Anas rubripes) and mallards (Anas
platyrhynchos) from these surveys using a log-linear hierarchical model
that accommodates differences in sample design and visibility associated
with these survey methods. Using a combined analysis of the surveys
based on total indicated birds, we estimate the American black duck
population to be 901,700 (95% CI: 715,2001,274,000) in 2011, with
526,900 (95% CI: 357,500852,300) mallards in the surveyed area.
Precision of estimates varies widely by species and region, with
transect surveys providing less precise results than plot surveys for
black ducks in areas of overlap. The combined survey analysis for black
ducks in the eastern survey region produced estimates with an average
yearly coefficient of variation (CV) of 12.1% for the entire area and
an average CV of 6.9% in the plot survey area. Mallards, which had a
more limited distribution in the region, had an average yearly CV of
22.1% over the entire region, and an average CV of 27.7% in the plot
survey area. Hierarchical models provide a rich framework for analyzing
and combining results from complex survey designs, providing useful
spatial and temporal information on population size and change in these
economically important species. (c) 2012 The Wildlife Society.
@article{
title = {Composite analysis of black duck breeding population surveys in Eastern North America},
type = {article},
year = {2012},
identifiers = {[object Object]},
keywords = {American black duck,Anas rubripes,breeding population,hierarchical model,plot surveys,transect Surveys,trend analysis},
pages = {1165-1176},
volume = {76},
id = {add53bf0-e4cd-39bf-8ae6-039820dc18af},
created = {2018-10-04T14:00:45.697Z},
file_attached = {true},
profile_id = {9aa84141-6744-3000-aa2d-8b83b70f0402},
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last_modified = {2019-10-01T14:06:13.353Z},
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abstract = {Waterfowl are monitored in eastern Canada and the northeastern United
States with 2 surveys: a transect survey from fixed-wing aircraft and a
plot survey conducted from helicopters. The surveys vary in extent, but
overlap exists in a core area of 9 strata covering portions of all
provinces from Ontario east to Newfoundland. We estimated population
change for American black ducks (Anas rubripes) and mallards (Anas
platyrhynchos) from these surveys using a log-linear hierarchical model
that accommodates differences in sample design and visibility associated
with these survey methods. Using a combined analysis of the surveys
based on total indicated birds, we estimate the American black duck
population to be 901,700 (95% CI: 715,2001,274,000) in 2011, with
526,900 (95% CI: 357,500852,300) mallards in the surveyed area.
Precision of estimates varies widely by species and region, with
transect surveys providing less precise results than plot surveys for
black ducks in areas of overlap. The combined survey analysis for black
ducks in the eastern survey region produced estimates with an average
yearly coefficient of variation (CV) of 12.1% for the entire area and
an average CV of 6.9% in the plot survey area. Mallards, which had a
more limited distribution in the region, had an average yearly CV of
22.1% over the entire region, and an average CV of 27.7% in the plot
survey area. Hierarchical models provide a rich framework for analyzing
and combining results from complex survey designs, providing useful
spatial and temporal information on population size and change in these
economically important species. (c) 2012 The Wildlife Society.},
bibtype = {article},
author = {Zimmerman, Guthrie S. and Sauer, John R. and Link, William A. and Otto, Mark},
journal = {Journal of Wildlife Management},
number = {6}
}
Downloads: 0
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The surveys vary in extent, but\noverlap exists in a core area of 9 strata covering portions of all\nprovinces from Ontario east to Newfoundland. We estimated population\nchange for American black ducks (Anas rubripes) and mallards (Anas\nplatyrhynchos) from these surveys using a log-linear hierarchical model\nthat accommodates differences in sample design and visibility associated\nwith these survey methods. Using a combined analysis of the surveys\nbased on total indicated birds, we estimate the American black duck\npopulation to be 901,700 (95% CI: 715,2001,274,000) in 2011, with\n526,900 (95% CI: 357,500852,300) mallards in the surveyed area.\nPrecision of estimates varies widely by species and region, with\ntransect surveys providing less precise results than plot surveys for\nblack ducks in areas of overlap. The combined survey analysis for black\nducks in the eastern survey region produced estimates with an average\nyearly coefficient of variation (CV) of 12.1% for the entire area and\nan average CV of 6.9% in the plot survey area. Mallards, which had a\nmore limited distribution in the region, had an average yearly CV of\n22.1% over the entire region, and an average CV of 27.7% in the plot\nsurvey area. Hierarchical models provide a rich framework for analyzing\nand combining results from complex survey designs, providing useful\nspatial and temporal information on population size and change in these\neconomically important species. 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The surveys vary in extent, but\noverlap exists in a core area of 9 strata covering portions of all\nprovinces from Ontario east to Newfoundland. We estimated population\nchange for American black ducks (Anas rubripes) and mallards (Anas\nplatyrhynchos) from these surveys using a log-linear hierarchical model\nthat accommodates differences in sample design and visibility associated\nwith these survey methods. Using a combined analysis of the surveys\nbased on total indicated birds, we estimate the American black duck\npopulation to be 901,700 (95% CI: 715,2001,274,000) in 2011, with\n526,900 (95% CI: 357,500852,300) mallards in the surveyed area.\nPrecision of estimates varies widely by species and region, with\ntransect surveys providing less precise results than plot surveys for\nblack ducks in areas of overlap. 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