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.
Critically Endangered | Endangered | Vulnerable |
---|---|---|
- | - | D1 |
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 | ||||||
|
|||||||||
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 | ||||||
|
|||||||||
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 | ||||||
|
|||||||||
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 | ||||||
|
|||||||||
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 | ||||||
|
|||||||||
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 | ||||||
|
Recommended citation
BirdLife International (2024) Species factsheet: Lava Gull Larus fuliginosus. Downloaded from
https://datazone.birdlife.org/species/factsheet/lava-gull-larus-fuliginosus on 23/12/2024.
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 23/12/2024.