Declining scaup populations: a retrospective analysis of long-term population and harvest survey data

Article Abstract:

The article examines potential factors behind scaup, or diving duck, population declines in Canada and the US, along with a critique of current population survey procedures. While geographic heterogeneity in demographic patterns proved useful, no methodology has yet adequately explained the significant decreases in the species' breeding population since 1980.

United States, Canada, Statistical Data Included, Methods, Models, Bird populations, Wildlife research

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Body mass of lesser scaup during fall and winter in the Mississippi Flyway

Article Abstract:

The body mass of lesser scaup is estimated and sex-specific variation in mass in relation to location of scaup collection, age, body morphometrics, and date of collection is analyzed with the help of samples of lesser scaup collected during fall 1999-2000 and winter 2000-2001 from Manitoba, Canada, Southward within the Mississippi Flyway to Louisiana, U.S.A. It is suggested that the factors such as habitat use, disease, parasites, and nutrient acquisition contribute to the continental scaup decline, rather than the seasonal factors.

Science & research, Mississippi, Poultry and eggs, not elsewhere classified, Other Poultry Production, Ducks, Research, Physiological aspects, Birds, Bird migration, Habitat selection

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Direct recovery rates of lesser scaup banded in northwest Minnesota: sources of heterogeneity

Article Abstract:

Research among lesser scaup captured and banded at Agassiz National Wildlife Refuge and Thief Lake Wildlife Management Area in eastern Marshall County, MN, indicates that hatching-year scaup are more vulnerable to hunting than after-hatching-year scaup. It was possible to establish considerable heterogeneity attributable to banding location. It was also found that condition bias of hunter-killed birds had a significant influence on recovery rates.

Protection and preservation

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