Redhead

Aythya americana

General Status Rank: 
Secure
ELCODE: 
ABNJB11030
Common Name: 
Redhead
Scientific Name: 
Aythya americana
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Taxonomy
Group: 
Bird
Kingdom: 
Animalia
Phylum: 
Chordata
Class: 
Aves
Order: 
Anseriformes
Family: 
Anatidae
References: 
B004
General Biology

Female Age at Maturity

1
References: 
H127

Longevity

average age unknown, oldest known 21 years
References: 
CS11

Economic/Human Considerations

important to sport hunters in southern Canada and US
References: 
B999
Habitat
shallow freshwater
References: 
B004
H126
H127
Distribution

Ecozones

Taiga Plains, Boreal Plains
References: 
B004

Distribution

0.02 (B004); <5% of total NWT area with possible range extensions north. Range extent visually estimated from range map in "Distribution of birds in NWT & Nunavut: 2009 Review" (CWS).
Score: 
F
References: 
B004
Winter Distribution Description: 
US and Mexico

Number of Occurrences

dispersed breeder
References: 
H127

Historical Distribution

unknown, but possibly similar to present
References: 
H127

Area of Occupancy

prob. stable
Score: 
-
References: 
W119
R270
Population

Population Size

~4,100 REDH in NWT in 2014 (data from 2014 USFWS waterfowl breeding surveys, strata 13-18 (W119 accessed Feb 10, 2015)).
Score: 
E
References: 
W119

Density

dispersed breeder
Trends

Trends

REDH population increased 167% from previous year and increased 51% since 1955 (W119 transects (strata 13-18, 20, & 77), continental population increased 85% since 1955 (R270).
Score: 
I
References: 
W119
R270
Threats

Threats

potential over-hunting, habitat loss, drought, pollution on wintering grounds, pressures on population occur mainly outside NT/NU in prairie breeding areas and wintering grounds
Score: 
C
References: 
B999
H127

Intrinsic Vulnerability

In north, pollution, development, global climate change,but in core southern breeding areas. pressures from loss of wetlands and upland nesting cover due to agriculture major problem; limited threats in NWT
Score: 
-
References: 
B999
H127
General Status Rank
Rank: 
Secure
Status Rank Description: 
At edge of range in NWT and numbers probably fluctuate because of inputs from southern areas
S Rank: 
S5
Decision Process Description: 
Drafted by Jim Hines with review by S. Carriere, mostly based on printed material in 2000; Reviewed in 2005 by J. Hines and C. Swoboda based on printed literature only, no change in status; Reviewed in 2010;no change ; Reviewed by Ian Fife and Cindy Wood CWS in 2015, no change
Last Updated: 
February 17, 2015

References

Age Of Maturity

  • Hines, Jim (2000) Pers. communication. Wildlife biologist, CWS, Yellowknife - H127 Return

Area of Occupancy

  • USFWS (2014) Accessed by CWS Region (Ian Fife and Cindy Wood) February 2015 https://migbirdapps.fws.gov/mbdc/databases/mas/maydb.asp - W119 Return
  • Olson, S.M. (2014) United States Fish and Wildlife Service. Vancouver, WA. 114pp - R270 Return

Economic Status

  • Bellrose, RC (1980) Ducks, geese, and swans of North America. Wildlife Mangement Institute and Stackpole Books 3rd edition CWS office. Yellowknife - B999 Return

Ecozones

  • Godfrey WE (1986) The Birds of Canada. National Museums of Canada Revised Edition RWED Library Call #QL685.G6 - B004 Return

Habitat

  • Godfrey WE (1986) The Birds of Canada. National Museums of Canada Revised Edition RWED Library Call #QL685.G6 - B004 Return
  • Carrière, S. (2000) Pers. communication. Ecosystem Management Biologist; RWED - H126 Return
  • Hines, Jim (2000) Pers. communication. Wildlife biologist, CWS, Yellowknife - H127 Return

Historical Distribution

  • Hines, Jim (2000) Pers. communication. Wildlife biologist, CWS, Yellowknife - H127 Return

Intrinsic Vulnerability

  • Bellrose, RC (1980) Ducks, geese, and swans of North America. Wildlife Mangement Institute and Stackpole Books 3rd edition CWS office. Yellowknife - B999 Return
  • Hines, Jim (2000) Pers. communication. Wildlife biologist, CWS, Yellowknife - H127 Return

Longevity

  • Clapp, R. B., Klimkiewicz, M. K., Kennard, J. H. (1982) Longevity records of North American birds: Gaviidae through Alcidae. Journal of Field Ornithology 53: 81–124 - CS11 Return

NWT Known Subspecies

Bellrose, RC (1980) Ducks, geese, and swans of North America. Wildlife Mangement Institute and Stackpole Books 3rd edition CWS office. Yellowknife - B999 Return

Number of Occurrences

  • Hines, Jim (2000) Pers. communication. Wildlife biologist, CWS, Yellowknife - H127 Return

Population Size

USFWS (2014) Accessed by CWS Region (Ian Fife and Cindy Wood) February 2015 https://migbirdapps.fws.gov/mbdc/databases/mas/maydb.asp - W119 Return

Range Extent

  • Godfrey WE (1986) The Birds of Canada. National Museums of Canada Revised Edition RWED Library Call #QL685.G6 - B004 Return

Short Term Trends

  • USFWS (2014) Accessed by CWS Region (Ian Fife and Cindy Wood) February 2015 https://migbirdapps.fws.gov/mbdc/databases/mas/maydb.asp - W119 Return
  • Olson, S.M. (2014) United States Fish and Wildlife Service. Vancouver, WA. 114pp - R270 Return

Taxonomy

  • Godfrey WE (1986) The Birds of Canada. National Museums of Canada Revised Edition RWED Library Call #QL685.G6 - B004 Return

Threats

  • Bellrose, RC (1980) Ducks, geese, and swans of North America. Wildlife Mangement Institute and Stackpole Books 3rd edition CWS office. Yellowknife - B999 Return
  • Hines, Jim (2000) Pers. communication. Wildlife biologist, CWS, Yellowknife - H127 Return