Population information

Order name Anseriformes
Family name Anatidae
Scientific name Mergus merganser Common name Goosander
Population name americanus, E & C North America
Breeding range N E North America Non-breeding range S Canada and E and Central U.S.
Red List Category Least Concern
Ramsar regions North America
Notes Split from americanus, North America in WPE4

Conservation Framework

Conservation framework Notes
No conservation frameworks
Note:

Population size

Publication Start year End year Minimum Maximum Estimate quality Notes References Actions
WPE 4 0 0 1,000,000 1,500,000 [S5803] [R699]
WPE 5 0 0 1,000,000 1,500,000 [S8192] [R699]

Population trends

Publication Start year End year Trend Trend quality Notes References Actions
WPE 4 0 0 Unknown
WPE 5 0 0 Unknown No idea

Population 1% level

Publication Yearset 1 percent Note
WPE 4 2006 12500
WPE 5 2012 12200

References

  • R699 - Wilkins. Khristi, in litt. August 2005.

Notes

  • S5803 - According to Bordage et al., the % of Hooded Mergansers in the boreal forest is about 15% of all mergansers seen, while Red-breasted Mergansers are nearly absent from the breeding areas at the time of the survey. This ratio was applied to the USFWS counts. USFWS count for 2003 was 1,235,678 mergansers and 1,405,405 for 2002. However, as those are breeding area estimates, they likely do not capture unpaired birds. If a 25% ratio of subadults and unpaired males is assumed, estimates of 1,312,907 Common Mergansers for 2003 and 1,493,242 for 2002 are obtained.
  • S8192 - According to Bordage et al., the % of Hooded Mergansers in the boreal forest is about 15% of all mergansers seen, while Red-breasted Mergansers are nearly absent from the breeding areas at the time of the survey. This ratio was applied to the USFWS counts. USFWS count for 2003 was 1,235,678 mergansers and 1,405,405 for 2002. However, as those are breeding area estimates, they likely do not capture unpaired birds. If a 25% ratio of subadults and unpaired males is assumed, estimates of 1,312,907 Common Mergansers for 2003 and 1,493,242 for 2002 are obtained.



Copyright Wetlands International 2012

Citation: Wetlands International (). "Waterbird Population Estimates" . Retrieved from wpe.wetlands.org on