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

Taxonomic source(s)
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A., Fishpool, L.D.C., Boesman, P. and Kirwan, G.M. 2016. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 2: Passerines. Lynx Edicions and BirdLife International, Barcelona, Spain and Cambridge, UK.
SACC. 2005 and updates. A classification of the bird species of South America. Available at: https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	B1ac(iv)+2ac(iv)	B1ac(iv)+2ac(iv); D1+2

Red List history

Year	Category	Criteria
2018	Endangered	B1ac(iv)+2ac(iv)
2017	Endangered	B1ac(iv)+2ac(iv)
2016	Critically Endangered	D
2015	Critically Endangered	D
2013	Critically Endangered	D
2012	Critically Endangered	D
2010	Critically Endangered	D1
2009	Critically Endangered	C2a(i); D1
2008	Critically Endangered
2004	Endangered
2000	Endangered
1996	Endangered
1994	Endangered
1988	Lower Risk/Least Concern

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

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	12 km2	medium
Area of Occupancy (breeding/resident)	1 km2	good
Number of locations	2	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	250-999 mature individuals	medium	estimated	2012
Population trend	stable	medium	estimated	2000-2010
Rate of change over the past 10 years/3 generations (longer of the two periods)	0%	-	-	-
Generation length	5.3 years	-	-	-
Number of subpopulations	2	-	-	-

Population justification: Between 2003 and 2008, the population on Champion Island numbered 20-52 individuals, with 65-179 on Gardner-by-Floreana. Both populations reached lows in 2007 following very bad weather conditions in 2006, with a total population of just 46 mature individuals remaining. Numbers then recovered in 2008 due to good, wet weather conditions (D. Wiedenfeld in litt. 2010) and in 2012, 142 birds were counted (Ortis-Catedral 2012c). The total population was estimated to be 756, based on bird counts in 2012 (Charles Darwin Foundation 2013), with the population having been >50 mature individuals since 2008. Therefore, the population size is placed here in the range 250-999 mature individuals.

Trend justification: The population on both islands declined between 2003 and 2007, with just 48 adults remaining in 2007. Wet weather conditions in 2008 caused the population to rebound (Hoeck, 2009, D. Wiedenfeld in litt. 2010), indicating the population is fluctuating. The increased frequency of dry years could mean a decreasing in the future, however this may be mitigated by the successful reintroduction of the species to Floreana Island.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
Ecuador	extant	native	yes

Country/Territory	IBA Name
Ecuador	Champion y Gardner de Floreana

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Shrubland	Subtropical/Tropical Dry	major	resident
Altitude	0 - 50 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Climate change & severe weather	Droughts	Timing		Scope		Severity		Impact
		Past, Likely to Return		Whole (>90%)		Causing/Could cause fluctuations		Past Impact
		Stresses Ecosystem degradation, Reduced reproductive success, Species mortality
Climate change & severe weather	Habitat shifting & alteration	Timing		Scope		Severity		Impact
		Future		Whole (>90%)		Unknown		Unknown
		Stresses Indirect ecosystem effects, Ecosystem degradation
Climate change & severe weather	Temperature extremes	Timing		Scope		Severity		Impact
		Ongoing		Whole (>90%)		Causing/Could cause fluctuations		Medium Impact: 7
		Stresses Indirect ecosystem effects, Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Canis familiaris	Timing		Scope		Severity		Impact
		Past, Likely to Return		Majority (50-90%)		Rapid Declines		Past Impact
		Stresses Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Capra hircus	Timing		Scope		Severity		Impact
		Past, Likely to Return		Majority (50-90%)		Slow, Significant Declines		Past Impact
		Stresses Ecosystem degradation
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Crotophaga ani	Timing		Scope		Severity		Impact
		Ongoing		Whole (>90%)		Slow, Significant Declines		Medium Impact: 7
		Stresses Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Equus asinus	Timing		Scope		Severity		Impact
		Past, Likely to Return		Majority (50-90%)		Slow, Significant Declines		Past Impact
		Stresses Ecosystem degradation
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Felis catus	Timing		Scope		Severity		Impact
		Past, Likely to Return		Majority (50-90%)		Rapid Declines		Past Impact
		Stresses Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Philornis downsi	Timing		Scope		Severity		Impact
		Ongoing		Whole (>90%)		Unknown		Unknown
		Stresses Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Rattus rattus	Timing		Scope		Severity		Impact
		Past, Likely to Return		Majority (50-90%)		Rapid Declines		Past Impact
		Stresses Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Sus domesticus	Timing		Scope		Severity		Impact
		Past, Likely to Return		Majority (50-90%)		Slow, Significant Declines		Past Impact
		Stresses Ecosystem degradation
Invasive and other problematic species, genes & diseases	Viral/prion-induced diseases - Avipoxvirus	Timing		Scope		Severity		Impact
		Past, Likely to Return		Majority (50-90%)		Slow, Significant Declines		Past Impact
		Stresses Species mortality

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Recommended citation
BirdLife International (2024) Species factsheet: Floreana Mockingbird Mimus trifasciatus. Downloaded from https://datazone.birdlife.org/species/factsheet/floreana-mockingbird-mimus-trifasciatus on 26/12/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org/species/search on 26/12/2024.