Data Zone
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: #http://www.museum.lsu.edu/~Remsen/SACCBaseline.htm#.
| Critically Endangered | Endangered | Vulnerable |
|---|---|---|
| - | - | - |
| Year | Category | Criteria |
|---|---|---|
| 2020 | Least Concern | |
| 2016 | Near Threatened | A2c+3c+4c |
| 2012 | Near Threatened | A2c+3c+4c |
| 2008 | Near Threatened | A2c; A3c; A4c |
| 2004 | Near Threatened | |
| 2000 | Lower Risk/Near Threatened | |
| 1994 | Lower Risk/Near Threatened | |
| 1988 | Near Threatened |
| Migratory status | not a migrant | Forest dependency | High |
| Land mass type |
Land-mass type - continent |
Average mass | - |
| Estimate | Data quality | |
|---|---|---|
| Extent of Occurrence breeding/resident (km2) | 288,000 | medium |
| Number of locations | - | |
| Severely Fragmented | - |
| Value | Data quality | Derivation | Year of estimate | |
|---|---|---|---|---|
| No. of mature individuals | 20000-49999 | poor | suspected | 2020 |
| Population trend | Decreasing | poor | inferred | - |
| Decline (3 years/1 generation past) | - | - | - | |
| Decline (5 years/1 generation past) | - | - | - | |
| Decline (10 years/1 generation past) | - | - | - | |
| Decline (10 years/3 generation future) | 1-9 | - | - | - |
| Decline (10 years/3 generation past and future) | 1-9 | - | - | - |
| Number of subpopulations | 2-5 | - | - | - |
| Percentage in largest subpopulation | 1-89 | - | - | - |
Population justification: No survey data is available. The species has been described as infrequent and difficult to see (R. Amorin in litt. 2020). Based on the recorded population density of a congener (Phylloscartes virescens: 1.14 individuals per km2; Thiollay 1986), the area of tree cover with over 30% canopy cover within the range in 2010 (94,000 km2; Global Forest Watch 2020) and assuming that only 40-60% of forest within the species's range is occupied, the population size is tentatively suspected to be in the range of 42,864-64,296 individuals, roughly equating to 28,576-42,864 mature individuals. The population size is here placed in the band 20,000-49,999 mature individuals. The species has a disjunct distribution, so is likely to have more than one subpopulation.
Trend justification: Approximately 4% of tree cover was lost between 2009 and 2019 within the species's range (Global Forest Watch 2020). A continuing decline in population size is inferred. The population size is suspected to have declined by 1-9% over the past ten years.
Over three years from 2017-2019, approximately 1.6% of tree cover within the species's range was lost over three years (Global Forest Watch 2020). If this rate were to continue across ten years, this would equate to a loss of 5% of tree cover. Hence, over the next ten years, the population size is suspected to undergo a reduction of 1-9%.
| Country/Territory | Occurrence status | Presence | Resident | Breeding | Non-breeding | Passage |
|---|---|---|---|---|---|---|
| Brazil | N | Extant | Yes |
| Country/Territory | IBA Name |
|---|---|
| Brazil | Encostas da Região de Domingos Martins |
| Brazil | Parque Nacional do Caparaó |
| Brazil | Serra dos Órgãos |
| Brazil | Serra do Tinguá |
| Brazil | Serra do Marumbi |
| Brazil | Serra da Mantiqueira |
| Brazil | São Francisco Xavier / Monte Verde |
| Brazil | Região de Blumenau |
| Brazil | Parque Estadual da Serra do Mar (entre Santos e São Sebastião) |
| Brazil | Serra do Tabuleiro State Park |
| Brazil | Parque Nacional de São Joaquim |
| Brazil | Parque Nacional de Itatiaia |
| Brazil | Serra da Bocaina / Paraty / Angra dos Reis |
| Brazil | Região dos Aparados da Serra |
| Habitat (level 1) | Habitat (level 2) | Importance | Occurrence |
|---|---|---|---|
| Forest | Subtropical/Tropical Moist Montane | major | resident |
| Altitude | 950 - 2150 m | Occasional altitudinal limits |
| Threat (level 1) | Threat (level 2) | Impact and Stresses | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Agriculture & aquaculture | Annual & perennial non-timber crops - Agro-industry farming | Timing | Scope | Severity | Impact | ||||
| Ongoing | Minority (<50%) | Slow, Significant Declines | Low Impact: 5 | ||||||
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| Agriculture & aquaculture | Livestock farming & ranching - Agro-industry grazing, ranching or farming | Timing | Scope | Severity | Impact | ||||
| Ongoing | Minority (<50%) | Slow, Significant Declines | Low Impact: 5 | ||||||
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| Natural system modifications | Fire & fire suppression - Increase in fire frequency/intensity | Timing | Scope | Severity | Impact | ||||
| Ongoing | Minority (<50%) | Unknown | Unknown | ||||||
|
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| Residential & commercial development | Tourism & recreation areas | Timing | Scope | Severity | Impact | ||||
| Ongoing | Minority (<50%) | Unknown | Unknown | ||||||
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Recommended citation
BirdLife International (2021) Species factsheet: Phylloscartes difficilis. Downloaded from
http://www.birdlife.org on 23/04/2021.
Recommended citation for factsheets for more than one species: BirdLife International (2021) IUCN Red List for birds. Downloaded from
http://www.birdlife.org on 23/04/2021.
