CR
Ridgway's Hawk Buteo ridgwayi



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
- - D1

Red List history
Year Category Criteria
2020 Critically Endangered C2a(i)
2018 Critically Endangered C2a(i)
2016 Critically Endangered C2a(i)
2015 Critically Endangered C2a(i)
2013 Critically Endangered C2a(i)
2012 Critically Endangered C2a(i)
2010 Critically Endangered C2a(i)
2009 Critically Endangered C2a(i)
2008 Critically Endangered
2004 Critically Endangered
2000 Critically Endangered
1996 Endangered
1994 Endangered
1988 Threatened
Species attributes

Migratory status not a migrant Forest dependency High
Land mass type Average mass -
Distribution

Estimate Data quality
Extent of Occurrence breeding/resident (km2) 26,700 medium
Number of locations 2-5 -
Severely Fragmented -
Population and trend
Value Data quality Derivation Year of estimate
No. of mature individuals 322 medium estimated 2019
Population trend Increasing medium observed -
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 2-100 - - -
Percentage in largest subpopulation - - -
Generation length (yrs) 8.17 - - -

Population justification: This species has an extremely small and fragmented population, which was previously in steep decline, with a 21% reduction in breeding pairs from 2006-2009, and as few as 109 breeding pairs in 2009 (Woolaver 2011). In 2014 The Peregrine Fund recorded 120 territorial pairs in Los Haitises and two pairs in Punta Cana (The Peregrine Fund 2014). In 2016 they recorded 120 territorial pairs in Los Haitises and 12 pairs in Punta Cana (T. Hayes unpubl. data). In 2019, The Peregrine Fund recorded 142 pairs of Ridgway’s Hawks in Los Haitises and 19 pairs in Punta Cana. These 19 pairs of hawks successfully produced 17 fledglings in 2019 and two additional young were fostered into nests in Punta Cana. Additionally, some areas in Los Haitises are not being consistently monitored, however we know that some pairs of hawks continue to exist outside the monitored area. The total number of Ridgway’s Hawks is estimated at a minimum of 427 individuals and 322 mature individuals.

Trend justification: Until the past decade, the population of Ridgway's Hawks was observed to be in rapid decline, with monitoring exhibiting 5-10% annual population declines, which equates to declines of up to 80% over three generations (c.24.5 years). However, through successful conservation action, ongoing monitoring and hands-on management of nests/nestlings in Los Haitises shows that population decline has now reversed and is trending upwards. In Los Limones, one of four regions in Los Haitises where The Peregrine fund is managing the population, the number of pairs has grown from 37 pairs in 2011 to 76 pairs in 2019, a 105% increase in nesting pairs over 8 years (T. Hayes unpubl. data). Significant population increases are ongoing and this marked increase in the Ridgway’s Hawk population is a direct result of conservation efforts by The Peregrine Fund and their project partners.


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

Important Bird and Biodiversity Areas (IBA)
Country/Territory IBA Name
Dominican Republic Haitises National Park
Dominican Republic Ebano Verde Scientific Reserve

Habitats & altitude
Habitat (level 1) Habitat (level 2) Importance Occurrence
Artificial/Terrestrial Arable Land marginal non-breeding
Forest Subtropical/Tropical Dry major resident
Forest Subtropical/Tropical Moist Lowland major resident
Forest Subtropical/Tropical Moist Montane major resident
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 - Shifting agriculture Timing Scope Severity Impact
Ongoing Majority (50-90%) Very Rapid Declines High Impact: 8
Stresses
Ecosystem degradation, Ecosystem conversion
Agriculture & aquaculture Annual & perennial non-timber crops - Small-holder farming Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Ecosystem degradation, Ecosystem conversion
Biological resource use Hunting & trapping terrestrial animals - Persecution/control Timing Scope Severity Impact
Ongoing Minority (<50%) Rapid Declines Medium Impact: 6
Stresses
Species mortality
Biological resource use Logging & wood harvesting - Unintentional effects: (subsistence/small scale) [harvest] Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Ecosystem degradation
Climate change & severe weather Storms & flooding Timing Scope Severity Impact
Ongoing Majority (50-90%) Negligible declines Low Impact: 5
Stresses
Ecosystem degradation, Reduced reproductive success
Human intrusions & disturbance Work & other activities Timing Scope Severity Impact
Ongoing Minority (<50%) Slow, Significant Declines Low Impact: 5
Stresses
Species disturbance, Reduced reproductive success
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
Species mortality
Invasive and other problematic species, genes & diseases Problematic native species/diseases Timing Scope Severity Impact
Ongoing Majority (50-90%) Negligible declines Low Impact: 5
Stresses
Species mortality
Transportation & service corridors Utility & service lines Timing Scope Severity Impact
Ongoing Majority (50-90%) Slow, Significant Declines Medium Impact: 6
Stresses
Species mortality

Recommended citation
BirdLife International (2022) Species factsheet: Buteo ridgwayi. Downloaded from http://www.birdlife.org on 25/06/2022. Recommended citation for factsheets for more than one species: BirdLife International (2022) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 25/06/2022.