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Madagascar Heron Ardea humbloti

IUCN Red List Criteria

Critically Endangered  
Endangered C2a(ii) 
Vulnerable C2a(i,ii) 

IUCN Red List history

Year Category
2012 Endangered
2008 Endangered
2006 Endangered
2004 Endangered
2000 Vulnerable
1996 Vulnerable
1994 Vulnerable
1988 Threatened

Species attributes

Migratory status not a migrant Forest dependency Low
Land mass type shelf island
Average mass -

Distribution

  Estimate Data quality
Extent of Occurrence breeding/resident (km2) 25,400 medium
Extent of Occurrence non-breeding (km2) 28,600 medium
Number of locations 11-100 -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals 1000 medium Estimated 2007
Population trend Decreasing medium -
Number of subpopulations 1 - - -
Largest subpopulation 1000 - - -
Generation length (yrs) 10.5 - - -
Population justification: Survey data from 2003 and 2004 combined with past literature suggests that there are no more than 1,500 individuals, roughly equivalent to 1,000 mature individuals.
Trend justification: This species's population is suspected to be decreasing in line with levels of egg-collection and hunting, cutting of nesting-trees, conversion of remaining wetlands to rice-paddies, and siltation of wetlands as a result of watershed deforestation. The likely rate of population decline, however, has not been estimated.

Country/Territory distribution

Country/Territory Occurrence status Presence Breeding Non-breeding Passage Resident
Comoros Vagrant Extant        
Madagascar Native Extant       Yes
Mayotte (to France) Vagrant Extant        

Important Bird Areas where this species has triggered the IBA criteria

Country/Territory IBA Name IBA link
Madagascar Ambavanankarana wetlands site factsheet
Madagascar Ampasindava Wetlands and Forest Complex site factsheet
Madagascar Ankaizina Wetlands site factsheet
Madagascar Ankarafantsika National Park and Ampijoroa Forestry Station site factsheet
Madagascar Ankarana Special Reserve site factsheet
Madagascar Ankobohobo wetlands site factsheet
Madagascar Baly Bay National Park site factsheet
Madagascar Bemamba Wetland Complex site factsheet
Madagascar Bombetoka Bay and Marovoay wetlands site factsheet
Madagascar Iles Barren complex site factsheet
Madagascar Lake Alaotra site factsheet
Madagascar Lake Itasy site factsheet
Madagascar Lakes Anony and Erombo site factsheet
Madagascar Maevatanana - Ambato-Boeni wetlands site factsheet
Madagascar Mahajamba Bay wetlands site factsheet
Madagascar Mahavavy Kinkony Wetland site factsheet
Madagascar Manambolomaty wetland complex and Tsimembo Classified Forest site factsheet
Madagascar Mangoky - Ankazoabo Forest SAPM site factsheet
Madagascar Port Bérgé Wetlands site factsheet
Madagascar Sahamalaza-Iles Radama (Sahamalaza Bay wetlands IBA) site factsheet
Madagascar Southwestern Coastal Wetlands and Nosy Manitse site factsheet
Madagascar Tambohorano wetland Complex site factsheet
Madagascar Wetlands of the Tsiribihina delta and upper Tsiribihina river site factsheet

Habitats & altitude

Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Arable Land suitable resident
Forest Subtropical/Tropical Mangrove Vegetation Above High Tide Level suitable resident
Marine Coastal/Supratidal Coastal Brackish/Saline Lagoons/Marine Lakes major resident
Marine Intertidal Mud Flats and Salt Flats major 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 - 1500 m Occasional altitudinal limits  

Threats & impact

Threat (level 1) Threat (level 2) Impact and Stresses
Agriculture & aquaculture Annual & perennial non-timber crops / Agro-industry farming Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Decline Medium Impact: 6
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Fishing & harvesting aquatic resources / Unintentional effects: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Future Minority (<50%) Slow, Significant Decline Low Impact: 3
Stresses
Competition
Biological resource use Hunting & trapping terrestrial animals / Intentional use (species is the target) Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Decline Low Impact: 5
Stresses
Species disturbance, Reduced reproductive success, Species mortality
Biological resource use Logging & wood harvesting / Unintentional effects: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Decline Low Impact: 5
Stresses
Ecosystem degradation
Climate change & severe weather Habitat shifting & alteration Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Decline Medium Impact: 6
Stresses
Ecosystem degradation
Pollution Agricultural & forestry effluents / Soil erosion, sedimentation Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Decline Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion

Utilisation

Purpose Primary form used Life stage used Source Scale Level Timing
Food (human) Whole Adults and juveniles Wild Subsistence, National Non-trivial Recent

Recommended citation
BirdLife International (2014) Species factsheet: Ardea humbloti. Downloaded from http://www.birdlife.org on 24/09/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 24/09/2014.

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 Ardeidae (Herons)
Species name author Milne-Edwards & Grandidier, 1885
Population size 1000 mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 25,400 km2
Country endemic? Yes
Links to further information
- Summary information on this species