Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
Critically Endangered | Endangered | Vulnerable |
---|---|---|
D | D | D1+2 |
Year | Category | Criteria |
---|---|---|
2016 | Critically Endangered | D |
2015 | Critically Endangered | D |
2013 | Critically Endangered | D |
2012 | Critically Endangered | D |
2011 | Critically Endangered | D1 |
2010 | Critically Endangered | D1 |
2009 | Critically Endangered | D1 |
2008 | Critically Endangered | |
2007 | Critically Endangered | |
2006 | Critically Endangered | |
2004 | Critically Endangered | |
2000 | Critically Endangered | |
1996 | Critically Endangered | |
1994 | Critically Endangered | |
1988 | Threatened |
Migratory status | not a migrant | Forest dependency | Does not normally occur in forest |
Land mass type |
Land-mass type - shelf island |
Average mass | - |
Estimate | Data quality | |
---|---|---|
Extent of Occurrence breeding/resident (km2) | 600 | medium |
Number of locations | 1 | - |
Severely Fragmented | - |
Value | Data quality | Derivation | Year of estimate | |
---|---|---|---|---|
No. of mature individuals | 20-49 | good | observed | 2012 |
Population trend | Stable | good | observed | - |
Decline (3 years/1 generation past) | - | - | - | |
Decline (5 years/1 generation past) | - | - | - | |
Decline (10 years/1 generation past) | - | - | - | |
Decline (10 years/3 generation future) | - | - | - | |
Decline (10 years/3 generation past and future) | - | - | - | |
Number of subpopulations | 1 | - | - | - |
Percentage in largest subpopulation | 100 | - | - | - |
Generation length (yrs) | 7.7 | - | - | - |
Population justification: A total of 25 adult birds were counted at the rediscovery site in 2008, with 29 there in 2011 (L.-A. Réne de Roland in litt. 2012) and 21 in 2012 (Bamford et al. 2015). The species may persist elsewhere but the numbers are likely to be tiny, with fewer than 50 individuals and mature individuals.
Trend justification: The species is likely to have dramatically declined in the past. Recent surveys suggest a modest increase in the tiny population which may be aided by conservation efforts. However, the population is still extremely small and prone to stochastic events. Breeding success is very limited with no young reared in some years. Young may have trouble finding adequate food and if they do fledge the likelihood of dispersing birds surviving away from main site is very low (H. G. Young in litt. 2012).
Country/Territory | Occurrence status | Presence | Resident | Breeding | Non-breeding | Passage |
---|---|---|---|---|---|---|
Madagascar | N | Extant | Yes |
Country/Territory | IBA Name |
---|---|
Madagascar | Lake Alaotra NPA |
Madagascar | Bemanevika NPA / Tsaratanana massif (south-west) |
Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
---|---|---|---|
Wetlands (inland) | Permanent Freshwater Lakes (over 8ha) | major | resident |
Wetlands (inland) | Permanent Freshwater Marshes/Pools (under 8ha) | major | resident |
Altitude | 750 - 1500 m | Occasional altitudinal limits |
Threat (level 1) | Threat (level 2) | Impact and Stresses | |||||||
---|---|---|---|---|---|---|---|---|---|
Agriculture & aquaculture | Annual & perennial non-timber crops - Scale Unknown/Unrecorded | Timing | Scope | Severity | Impact | ||||
Past, Likely to Return | Majority (50-90%) | Slow, Significant Declines | Past Impact | ||||||
|
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Biological resource use | Fishing & harvesting aquatic resources - Unintentional effects: (subsistence/small scale) [harvest] | Timing | Scope | Severity | Impact | ||||
Past, Likely to Return | Majority (50-90%) | Rapid Declines | Past Impact | ||||||
|
|||||||||
Biological resource use | Hunting & trapping terrestrial animals - Intentional use (species is the target) | Timing | Scope | Severity | Impact | ||||
Past, Likely to Return | Majority (50-90%) | Rapid Declines | Past Impact | ||||||
|
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Climate change & severe weather | Habitat shifting & alteration | Timing | Scope | Severity | Impact | ||||
Future | Whole (>90%) | Slow, Significant Declines | Low Impact: 5 | ||||||
|
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Climate change & severe weather | Other impacts | Timing | Scope | Severity | Impact | ||||
Future | Whole (>90%) | Slow, Significant Declines | Low Impact: 5 | ||||||
|
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Invasive and other problematic species, genes & diseases | Invasive non-native/alien species/diseases - Eichhornia crassipes | Timing | Scope | Severity | Impact | ||||
Ongoing | Majority (50-90%) | Unknown | Unknown | ||||||
|
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Invasive and other problematic species, genes & diseases | Invasive non-native/alien species/diseases - Micropterus salmoides | Timing | Scope | Severity | Impact | ||||
Past, Unlikely to Return | Minority (<50%) | Unknown | Past Impact | ||||||
|
|||||||||
Invasive and other problematic species, genes & diseases | Invasive non-native/alien species/diseases - Named species | Timing | Scope | Severity | Impact | ||||
Ongoing | Majority (50-90%) | Unknown | Unknown | ||||||
|
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Natural system modifications | Dams & water management/use - Abstraction of surface water (agricultural use) | Timing | Scope | Severity | Impact | ||||
Past, Likely to Return | Majority (50-90%) | Slow, Significant Declines | Past Impact | ||||||
|
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Pollution | Agricultural & forestry effluents - Soil erosion, sedimentation | Timing | Scope | Severity | Impact | ||||
Ongoing | Majority (50-90%) | Slow, Significant Declines | Medium Impact: 6 | ||||||
|
|||||||||
Pollution | Agricultural & forestry effluents - Type Unknown/Unrecorded | Timing | Scope | Severity | Impact | ||||
Ongoing | Majority (50-90%) | Slow, Significant Declines | Medium Impact: 6 | ||||||
|
Purpose | Primary form used | Life stage used | Source | Scale | Level | Timing |
---|---|---|---|---|---|---|
Food - human | - | - | Non-trivial | Recent | ||
Pets/display animals, horticulture | - | - | International | Non-trivial | Recent |
Recommended citation
BirdLife International (2022) Species factsheet: Aythya innotata. Downloaded from
http://www.birdlife.org on 23/05/2022.
Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from
http://www.birdlife.org on 23/05/2022.