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Brown Teal Anas chlorotis

IUCN Red List Criteria

Critically Endangered  
Endangered B1ab(iii) 
Vulnerable B1ab(iii);D2 

IUCN Red List history

Year Category
2012 Endangered
2008 Endangered
2007 Endangered
2006 Endangered
2004 Endangered
2000 Endangered
1994 Not Recognised
1988 Not Recognised

Species attributes

Migratory status not a migrant Forest dependency Does not normally occur in forest
Land mass type   Average mass 582 g

Distribution

  Estimate Data quality
Extent of Occurrence breeding/resident (km2) 940 medium
Number of locations 3 -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals 1300 medium Estimated 2012
Population trend Increasing good -
Number of subpopulations 3 - - -
Largest subpopulation 800 - - -
Generation length (yrs) 6.6 - - -
Population justification: Over 1,100 birds were estimated in 2005 at Great Barrier Island and Northland alone (with c.600 at each) (A. Booth et al. in litt. 2012, N. Hayes in litt. 2012), and the population on Coromandel has been estimated at c.700 birds (N. Hayes in litt. 2012), suggesting that the population numbers c.1,900 individuals, treated here as including c.1,300 mature individuals, based on the assumption that they account for around 2/3 of the total population.
Trend justification: The population had been falling rapidly owing to predation by introduced mammals; however, since 2003 it has been increasing as a result of intensive management. The rate of increase has not been estimated.

Country/Territory distribution

Country/Territory Occurrence status Presence Breeding Non-breeding Passage Resident
New Zealand Native Extant       Yes

Habitats & altitude

Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Aquatic & Marine Water Storage Areas (over 8ha) suitable resident
Artificial/Terrestrial Pastureland suitable resident
Forest Temperate major breeding
Marine Intertidal Sandy Shoreline and/or Beaches, Sand Bars, Spits, Etc marginal resident
Wetlands (inland) Permanent Freshwater Lakes (over 8ha) major resident
Wetlands (inland) Permanent Freshwater Marshes/Pools (under 8ha) major resident
Wetlands (inland) Permanent Rivers/Streams/Creeks (includes waterfalls) major resident
Altitude 0 - 0 m Occasional altitudinal limits  

Threats & impact

Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Livestock farming & ranching / Agro-industry grazing, ranching or farming Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Decline Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Hunting & trapping terrestrial animals / Intentional use (species is the target) Timing Scope Severity Impact
Past, Unlikely to Return Majority (50-90%) Rapid Declines Past Impact
Stresses
Species mortality
Climate change & severe weather Droughts Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Decline Medium Impact: 6
Stresses
Ecosystem degradation
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases Timing Scope Severity Impact
Ongoing Majority (50-90%) Rapid Declines Medium Impact: 7
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases Timing Scope Severity Impact
Ongoing Majority (50-90%) Rapid Declines Medium Impact: 7
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases Timing Scope Severity Impact
Ongoing Minority (<50%) Rapid Declines Medium Impact: 6
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases Timing Scope Severity Impact
Ongoing Minority (<50%) Rapid Declines Medium Impact: 6
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Decline Low Impact: 5
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases Timing Scope Severity Impact
Ongoing Minority (<50%) Rapid Declines Medium Impact: 6
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Problematic native species/diseases Timing Scope Severity Impact
Past, Unlikely to Return Majority (50-90%) Slow, Significant Decline Past Impact
Stresses
Species mortality
Transportation & service corridors Roads & railroads Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Decline Medium Impact: 6
Stresses
Species mortality

Utilisation

Purpose Primary form used Life stage used Source Scale Level Timing
Pets Whole Adults and juveniles Wild International Trivial Recent
Sport Whole Adults and juveniles Wild Subsistence, National Non-trivial Recent

Recommended citation
BirdLife International (2014) Species factsheet: Anas chlorotis. Downloaded from http://www.birdlife.org on 23/09/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 23/09/2014.

This information is based upon, and updates, the information published in BirdLife International (2000) Threatened birds of the world. Barcelona and Cambridge, UK: Lynx Edicions and BirdLife International, BirdLife International (2004) Threatened birds of the world 2004 CD-ROM and BirdLife International (2008) Threatened birds of the world 2008 CD-ROM. These sources provide the information for species accounts for the birds on the IUCN Red List.

To provide new information to update this factsheet or to correct any errors, please email BirdLife

To contribute to discussions on the evaluation of the IUCN Red List status of Globally Threatened Birds, please visit BirdLife's Globally Threatened Bird Forums.

Key facts
Current IUCN Red List category Endangered
Family Anatidae (Ducks, Geese, Swans)
Species name author Gray, 1845
Population size 1300 mature individuals
Population trend Increasing
Distribution size (breeding/resident) 940 km2
Country endemic? Yes
Links to further information
- Summary information on this species