NT
Mascarene Swiftlet Aerodramus francicus



Taxonomy

Taxonomic note
Aerodramus francicus (del Hoyo and Collar 2014) was previously placed in the genus Collocalia as C. francica.

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
- - -

Red List history
Year Category Criteria
2019 Near Threatened B1ab(ii,iii)
2016 Near Threatened C1
2012 Near Threatened C1
2008 Near Threatened C1
2004 Near Threatened
2000 Lower Risk/Near Threatened
1994 Lower Risk/Near Threatened
1988 Near Threatened
Species attributes

Migratory status not a migrant Forest dependency Low
Land mass type Average mass 9 g
Distribution

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 16,200 medium
Number of locations 11-100 -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals 10000-19999 medium estimated 2010
Population trend Decreasing medium suspected -
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 - - -
Percentage in largest subpopulation - - -
Generation length (yrs) 5 - - -

Population justification: The population on Mauritius was estimated at 2,244-2,610 individuals (G. Middlteon per C. Jones in litt. 2000), and the population on Réunion is likely to be far larger, with some of the largest colonies thought to contain 5,000 pairs (St Denis à La Possession) and 1,000 pairs (Bras de la Plaine) (V. Tatayah, N. Laurent and F.-X. Couzi in litt. 2018). The overall population size has not been estimated, but based on these figures, it may be precautionarily placed in the range 10,000-19,999 mature individuals.

Trend justification: Over recent years, the population on Réunion has increased substantially (A. Cheke pers. comm. 2000), whilst that on Mauritius has declined, making it difficult to judge the overall population trend. While it may be possible to infer that the species is in decline as a result of the ongoing threats within its range, it is currently not possible to clearly quantify the rate of decline.


Country/territory distribution
Country/Territory Occurrence status Presence Resident Breeding Non-breeding Passage
Mauritius N Extant Yes
Réunion (to France) N Extant Yes

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Mauritius Chamarel - Le Morne
Mauritius Black River Gorges National Park and surrounding areas
Mauritius Macchabé - Brise Fer forest
Mauritius Relict Forests of the Central Plateau
Mauritius East coast mountains
Mauritius Plaine des Roches - Bras d'Eau
Mauritius Pont Bon Dieu
Mauritius Moka mountains
Réunion (to France) Grand Bénard - Tapcal
Réunion (to France) Plaine des Chicots - Plaine d'Affouches
Réunion (to France) Mouth of the Cirque de Salazie
Réunion (to France) Rivière des Marsouins - Grand Etang
Réunion (to France) Grand Bassin - Le Dimitile
Réunion (to France) Rivière des Remparts - Rivière Langevin
Réunion (to France) Ravine de la Grande Chaloupe

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Arable Land suitable resident
Artificial/Terrestrial Subtropical/Tropical Heavily Degraded Former Forest suitable resident
Caves and Subterranean Habitats (non-aquatic) Caves major breeding
Forest Subtropical/Tropical Moist Lowland major resident
Grassland Subtropical/Tropical High Altitude suitable resident
Shrubland Subtropical/Tropical High Altitude suitable resident
Altitude   Occasional altitudinal limits  

Threats & impact
Threat (level 1) Threat (level 2) Impact and Stresses
Biological resource use Hunting & trapping terrestrial animals - Intentional use (species is the target) Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Reduced reproductive success, Species mortality
Biological resource use Hunting & trapping terrestrial animals - Persecution/control Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Reduced reproductive success, Species mortality
Human intrusions & disturbance Recreational activities Timing Scope Severity Impact
Future Minority (<50%) Unknown Unknown
Stresses
Species disturbance, Reduced reproductive success
Human intrusions & disturbance Work & other activities Timing Scope Severity Impact
Ongoing Minority (<50%) Negligible declines Low Impact: 4
Stresses
Species disturbance, Reduced reproductive success
Pollution Agricultural & forestry effluents - Herbicides and pesticides Timing Scope Severity Impact
Ongoing Unknown Unknown Unknown
Stresses
Indirect ecosystem effects
Transportation & service corridors Roads & railroads Timing Scope Severity Impact
Future Unknown Unknown Unknown
Stresses
Species disturbance, Ecosystem degradation

Recommended citation
BirdLife International (2021) Species factsheet: Aerodramus francicus. Downloaded from http://www.birdlife.org on 28/10/2021. Recommended citation for factsheets for more than one species: BirdLife International (2021) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 28/10/2021.