• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

Taxonomic note
Zapornia olivieri (del Hoyo and Collar 2014) was previously placed in the genus Amaurornis.

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.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	C2a(i)	C2a(i); D1

Red List history

Year	Category	Criteria
2021	Endangered	C2a(i)
2016	Endangered	C2a(i)
2012	Endangered	C2a(i)
2008	Endangered	C2a(i)
2004	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)	111,000	medium
Number of locations		-
Severely Fragmented		-

	Value	Data quality	Derivation	Year of estimate
No. of mature individuals	250-999	medium	estimated	2004
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)	20-29	-	-	-
Decline (10 years/3 generation past and future)	20-29	-	-	-
Number of subpopulations	5	-	-	-
Percentage in largest subpopulation	1-89	-	-	-
Generation length (yrs)	3.8	-	-	-

Population justification: Survey results from 2003-2006 estimated a total of 215 individuals at five key sites, suggesting that the total population may not exceed 250 individuals (M. Rabenandrasana in litt. 2004; Rabenandrasana et al. 2009). However, this may be an underestimate as the surveys were brief and the methods were still being developed, thus the species is not necessarily absent at sites where it was not recorded, and the number of sightings is likely to indicate a larger population (R. Safford in litt. 2004). Therefore, the estimated population range used here is 250-999 mature individuals. The largest single population recorded so far is only 62 individuals (Rabenandrasana et al. 2009).

Trend justification: The species is inferred to be in decline owing to the continuing degradation and conversion of wetlands in Madagascar for cultivation (Kull 2012; D'Urban Jackson et al. 2019). Kull (2012) estimated that between 1950-1994, 60% of wetlands were lost, roughly equating to a loss rate of 21% over three generations (11.4 years [Bird et al. 2020]). As wetland degradation is linked to the expanding human population, it is expected that the declines will continue into the future, and the rate of population decline for this species is suspected to fall into the band 20-29%.

Country/Territory	Presence	Origin	Resident	Breeding	Non-breeding	Passage
Madagascar	extant	native	yes

Country/Territory	IBA Name
Madagascar	Bemamba Wetland Complex
Madagascar	Lake Ihotry - Mangoky Delta Complex NPA

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Introduced vegetation		suitable	resident
Wetlands (inland)	Bogs, Marshes, Swamps, Fens, Peatlands	suitable	resident
Wetlands (inland)	Permanent Freshwater Lakes (over 8ha)	suitable	resident
Wetlands (inland)	Permanent Freshwater Marshes/Pools (under 8ha)	suitable	resident
Wetlands (inland)	Permanent Rivers/Streams/Creeks (includes waterfalls)	suitable	resident
Altitude	0 - 100 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
		Ongoing		Majority (50-90%)		Rapid Declines		Medium Impact: 7
		Stresses Ecosystem degradation, Ecosystem conversion
Biological resource use	Fishing & harvesting aquatic resources - Unintentional effects: (subsistence/small scale) [harvest]	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Causing/Could cause fluctuations		Low Impact: 5
		Stresses Species disturbance
Biological resource use	Gathering terrestrial plants - Unintentional effects (species is not the target)	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Negligible declines		Low Impact: 5
		Stresses Ecosystem degradation
Biological resource use	Hunting & trapping terrestrial animals - Intentional use (species is the target)	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		No decline		Low Impact: 4
		Stresses Species mortality
Climate change & severe weather	Storms & flooding	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Ecosystem degradation, Species mortality
Human intrusions & disturbance	Recreational activities	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Causing/Could cause fluctuations		Low Impact: 5
		Stresses Species disturbance
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Canis familiaris	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 - Unspecified species	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Unknown		Unknown
		Stresses Species mortality
Natural system modifications	Dams & water management/use - Dams (size unknown)	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Unknown		Unknown
		Stresses Indirect ecosystem effects, Ecosystem degradation, Ecosystem conversion
Natural system modifications	Fire & fire suppression - Trend Unknown/Unrecorded	Timing		Scope		Severity		Impact
		Ongoing		Majority (50-90%)		Slow, Significant Declines		Medium Impact: 6
		Stresses Ecosystem degradation

Purpose	Primary form used	Life stage used	Source	Scale	Level	Timing
Food - human	-	-			non-trivial	recent

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Recommended citation
BirdLife International (2023) Species factsheet: Zapornia olivieri. Downloaded from http://datazone.birdlife.org/species/factsheet/sakalava-rail-zapornia-olivieri on 28/05/2023. Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from http://datazone.birdlife.org on 28/05/2023.