• 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. 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.
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
-	-	D1

Red List history

Year	Category	Criteria
2018	Vulnerable	D1
2016	Vulnerable	D1
2012	Vulnerable	D1
2010	Vulnerable	D1
2008	Vulnerable	D1
2006	Vulnerable
2004	Vulnerable
2000	Vulnerable
1996	Vulnerable
1994	Vulnerable
1988	Near Threatened

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)	40,300 km2	medium
Extent of Occurrence (non-breeding)	42,400 km2	medium
Number of locations	11-100	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	600-800 mature individuals	medium	estimated	1969
Population trend	stable	poor	observed	1992-2010
Rate of change over the past 10 years/3 generations (longer of the two periods)	0%	-	-	-
Generation length	6 years	-	-	-
Number of subpopulations	2-100	-	-	-
Percentage of mature individuals in largest subpopulation	1-89%	-	-	-

Population justification: Snow and Snow (1969) estimated 600-800 mature individuals which Wetlands International (2002) interpreted to equate to 900-1,200 individuals. This may be an overestimate (Aguirre 2007, D. Wiedenfeld in litt. 2012).

Trend justification: Numbers are assumed to be stable although there are a number of potential threats which may be having an impact.

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

Country/Territory	IBA Name
Ecuador	Áreas costeras de Fernandina y del occidente de Isabela
Ecuador	Humedales del Sur de Isabela
Ecuador	Isla Floreana
Ecuador	Isla San Cristóbal
Ecuador	Puerto Ayora

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Marine Coastal/Supratidal	Coastal Brackish/Saline Lagoons/Marine Lakes	suitable	resident
Marine Intertidal	Sandy Shoreline and/or Beaches, Sand Bars, Spits, Etc	major	resident
Marine Intertidal	Shingle and/or Pebble Shoreline and/or Beaches	major	resident
Marine Neritic	Pelagic	major	resident
Altitude		Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Biological resource use	Fishing & harvesting aquatic resources - Persecution/control	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		Stresses Species disturbance, Species mortality
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
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Canis familiaris	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		Stresses Species disturbance, Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Felis catus	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		Stresses Species disturbance, Reduced reproductive success, Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Rattus rattus	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Negligible declines		Low Impact: 4
		Stresses Species disturbance, Reduced reproductive success
Invasive and other problematic species, genes & diseases	Viral/prion-induced diseases - Newcastle Disease Virus (NDV)	Timing		Scope		Severity		Impact
		Future		Majority (50-90%)		Slow, Significant Declines		Low Impact: 4
		Stresses Species mortality

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Recommended citation
BirdLife International (2024) Species factsheet: Lava Gull Larus fuliginosus. Downloaded from https://datazone.birdlife.org/species/factsheet/lava-gull-larus-fuliginosus on 22/11/2024.
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 22/11/2024.