EN
Madagascar Grebe Tachybaptus pelzelnii



Taxonomy

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.

IUCN Red list criteria met and history
Red List criteria met
Critically Endangered Endangered Vulnerable
- C2a(ii) C2a(i,ii)

Red List history
Year Category Criteria
2018 Endangered C2a(ii)
2016 Vulnerable A3ce; C2a(ii)
2012 Vulnerable A3ce+4ce;C2a(ii)
2010 Vulnerable A3c,e; C2a(ii)
2008 Vulnerable A3c,e; C2a(ii)
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 Land-mass type - shelf island
Average mass -
Extent of occurrence (EOO)

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 689,000 medium
Number of locations 11-100 -
Fragmentation -
Population and trend
Estimate Data quality Derivation Year of estimate
No. of mature individuals 1000-2499 medium estimated 2018
Population trend Decreasing medium inferred -
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 - - -
Largest subpopulations 100 - - -
Generation length (yrs) 5.4 - - -

Population justification: The population has been estimated to be only 2,000 individuals (A. Bamford in litt. 2018) (roughly equating to c.1,300 mature individuals), although it has been suggested that the species may have been difficult to find for some time (A. Konter in litt. 2018). Indeed there has been suspicion that the population may have been very low for a while (e.g. potentially 1,500-2,500 individuals; M. Rabenandrasana in litt. 2007). Given there is some uncertainty, and that these are only rough estimates, the population size has been placed here in the range 1,000-2,499 mature individuals.

Trend justification: The species is considered 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), but the rate of decline has not been accurately quantified.


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Madagascar N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Madagascar Andringitra National Park
Madagascar Ankaizina wetlands
Madagascar Ankarafantsika National Park and Ampijoroa
Madagascar Baly Bay National Park
Madagascar Bezavona Classified Forest
Madagascar Bidia Classified Forest
Madagascar Bombetoka Bay - Marovoay NPA
Madagascar Cap Saint André forest and wetlands
Madagascar Didy and Ivondro wetlands
Madagascar Lake Alaotra NPA
Madagascar Lake Ihotry - Mangoky Delta Complex NPA
Madagascar Lake Itasy
Madagascar Lakes Anony and Erombo
Madagascar Maevatanana-Ambato-Boeny wetlands
Madagascar Mananara-North National Park
Madagascar Mangoky-Ankazoabo Complex NPA
Madagascar Menabe forest complex
Madagascar Mikea Protected Area
Madagascar Montagne d'Ambre National Park and Special Reserve
Madagascar Parc National d'Isalo
Madagascar Sihanaka Forest
Madagascar Tsingy de Bemaraha National Park and Strict Nature Reserve
Madagascar Tsingy de Namoroka National Park
Madagascar Zombitse-Vohibasia National Park and extension

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 Declines 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 - Coptodon zillii Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Eichhornia crassipes Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Named species Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Species mortality
Invasive and other problematic species, genes & diseases Invasive non-native/alien species/diseases - Named species Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation
Invasive and other problematic species, genes & diseases Problematic native species/diseases - Tachybaptus ruficollis Timing Scope Severity Impact
Ongoing Whole (>90%) Slow, Significant Declines 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 (2019) Species factsheet: Tachybaptus pelzelnii. Downloaded from http://www.birdlife.org on 15/10/2019. Recommended citation for factsheets for more than one species: BirdLife International (2019) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 15/10/2019.