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

Justification of Red List category
This species has a large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence <20,000 km² combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). Despite the fact that the population trend appears to be decreasing, the decline is not believed to be sufficiently rapid to approach the thresholds for Vulnerable under the population trend criterion (>30% decline over ten years or three generations). The population size is unknown, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (<10,000 mature individuals with a continuing decline estimated to be >10% in ten years or three generations, or with a specified population structure). For these reasons the species is evaluated as Least Concern.

Population justification
The global population size has not been quantified, but this species is described as locally uncommon to common (Stotz et al. 1996, Fitzpatrick and Kirwan 2020).

Trend justification

There are no data on the population trend, but declines are suspected on the basis of habitat loss and degradation. Tree cover is lost within the range at a rate of 3-4% over ten years (Global Forest Watch 2022, using Hansen et al. [2013] data and methods disclosed therein). This is primarily due to agricultural conversion, urbanization, industrialisation and associated road-building (Fitzpatrick and Kirwan 2020). Additional habitat degradation may also compound population declines above the rate of tree cover loss alone, and as such, population declines are placed here in the band of 1-9% over ten years.

Phylloscartes oustaleti occurs in east Brazil in the Serra do Mar and Serra da Mantiqueira from Bahia to Santa Catarina.

The species occurs in humid forests, mostly in the interior but occasionally along borders (Silveira et al. 2022).

Current key threats are urbanisation, industrialization, agricultural expansion, mining and road-building (Dinerstein et al. 1995, Fitzpatrick and Kirwan 2020, Silveira et al. 2022).

Conservation Actions Underway
It occurs in several protected areas, including Augusto Ruschi Biological Reserve, Intervales State Park and Mata dos Godoy State Park.

Conservation Actions Proposed
Quantify population size and density. Study its ecology and its ability to persist in degraded and fragmented habitats. Effectively protect areas where the species occurs.

Text account compilers
Fernando, E., Hermes, C.

Contributors
Capper, D., Lima, D.M., O'Brien, A., Phalan, B., Sharpe, C.J., Subirá, R. & Symes, A.

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Recommended citation
BirdLife International (2024) Species factsheet: Oustalet's Tyrannulet Phylloscartes oustaleti. Downloaded from https://datazone.birdlife.org/species/factsheet/oustalets-tyrannulet-phylloscartes-oustaleti 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.