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Madagascar Grebe Tachybaptus pelzelnii

IUCN Red List Criteria

Critically Endangered  
Endangered  
Vulnerable A3ce+4ce;C2a(ii) 

IUCN Red List history

Year Category
2012 Vulnerable
2010 Vulnerable
2008 Vulnerable
2004 Vulnerable
2000 Vulnerable
1996 Vulnerable
1994 Vulnerable
1988 Threatened

Species attributes

Migratory status not a migrant Forest dependency Does not normally occur in forest
Land mass type shelf island
Average mass -

Distribution

  Estimate Data quality
Extent of Occurrence breeding/resident (km2) 593,000 medium
Number of locations 11-100 -
Fragmentation -

Population & trend

  Estimate Data quality Derivation Year of estimate
No. of mature individuals 3300 medium Estimated 2007
Population trend Decreasing medium -
Number of subpopulations 1 - - -
Largest subpopulation 5000 - - -
Generation length (yrs) 5.4 - - -
Population justification: The population estimate of at least 5,000 individuals, roughly equivalent to 3,300 mature individuals, is based on recent records and results of surveys since Collar and Stuart (1985). Although it has been suggested that the population is now lower than this (M. Rabenandrasana in litt. 2007), further surveys are required to confirm this suspicion.
Trend justification: The species is suspected to be in decline owing to habitat loss, introduced species and bycatch. This decline is expected to accelerate over the next 16 years (three generations) as wetlands are increasingly targeted for cultivation and the species becomes more restricted to small wetlands that are unused by humans (O. Langrand in litt. 2007; M. Rabenandrasana in litt. 2007; H.G. Young in litt. 2007).

Country/Territory distribution

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

Important Bird Areas where this species has triggered the IBA criteria

Country/Territory IBA Name IBA link
Madagascar Andringitra National Park site factsheet
Madagascar Ankaizina Wetlands site factsheet
Madagascar Ankarafantsika National Park and Ampijoroa Forestry Station site factsheet
Madagascar Baly Bay National Park site factsheet
Madagascar Bezavona Classified Forest site factsheet
Madagascar Bidia Classified Forest site factsheet
Madagascar Bombetoka Bay and Marovoay wetlands site factsheet
Madagascar Cape Saint André Forest and Wetlands site factsheet
Madagascar Isalo (Isalo National Park IBA) site factsheet
Madagascar Lake Alaotra site factsheet
Madagascar Lake Ihotry Hunting Reserve - Mangoky Delta complex site factsheet
Madagascar Lake Itasy site factsheet
Madagascar Lakes Anony and Erombo site factsheet
Madagascar Maevatanana - Ambato-Boeni wetlands site factsheet
Madagascar Mananara-North National Park site factsheet
Madagascar Menabe forest complex site factsheet
Madagascar Mikea Forest site factsheet
Madagascar Montagne d'Ambre National Park and Special Reserve site factsheet
Madagascar Namoroka National Park site factsheet
Madagascar Tsingy de Bemaraha National Park (Bemaraha Tsingy National Park and Strict Nature Reserve IBA) site factsheet
Madagascar Zahamena-Mantadia SAPM site factsheet
Madagascar Zombitse-Vohibasia National Park site factsheet

Habitats & altitude

Habitat (level 1) Habitat (level 2) Importance Occurrence
Marine Coastal/Supratidal Coastal Brackish/Saline Lagoons/Marine Lakes suitable 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) suitable resident
Wetlands (inland) Seasonal/Intermittent Freshwater Lakes (over 8ha) suitable breeding
Wetlands (inland) Seasonal/Intermittent Freshwater Marshes/Pools (under 8ha) suitable breeding
Altitude 0 - 2000 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%) Negligible declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Fishing & harvesting aquatic resources / Unintentional effects: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Decline Medium Impact: 6
Stresses
Species mortality
Biological resource use Hunting & trapping terrestrial animals / Intentional use (species is the target) Timing Scope Severity Impact
Ongoing Minority (<50%) Unknown Unknown
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases / Congo Tilapia (Tilapia melanopleura) 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 / Redbelly Tilapia (Tilapia zillii) 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 / Snakehead fish (Channa spp.) 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 / Unspecified tilapia fish (Tilapia spp.) 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 / Water Hyacinth (Eichhornia crassipes) Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Decline Medium Impact: 6
Stresses
Ecosystem degradation
Invasive and other problematic species, genes & diseases Problematic native species/diseases Timing Scope Severity Impact
Ongoing Whole (>90%) Slow, Significant Decline Medium Impact: 7
Stresses
Hybridisation
Pollution Agricultural & forestry effluents / Herbicides and pesticides Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Ecosystem degradation

Recommended citation
BirdLife International (2014) Species factsheet: Tachybaptus pelzelnii. Downloaded from http://www.birdlife.org on 20/12/2014. Recommended citation for factsheets for more than one species: BirdLife International (2014) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 20/12/2014.

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 Vulnerable
Family Podicipedidae (Grebes)
Species name author (Hartlaub, 1861)
Population size 3300 mature individuals
Population trend Decreasing
Distribution size (breeding/resident) 593,000 km2
Country endemic? Yes
Links to further information
- Summary information on this species