Data Zone
Justification of Red List category
This species qualifies as Vulnerable owing to rapidly accelerating rates of habitat loss within the range.
Population justification
There are no estimates of the population size (Renjifo et al. 2016). Nevertheless, based on the localised distribution and low number of records, it is suspected that the population numbers less than 2,500 mature individuals. It is here tentatively placed in the band 1,000-2,499 mature individuals, though an accurate quantification is urgently required.
Trend justification
The population trend has not been investigated, but declines are suspected on the basis of habitat loss.
The rate of tree cover loss within the range has been fairly low over the past ten years (6-9%; Renjifo et al. 2016, Global Forest Watch 2023, using Hansen et al. [2013] data and methods disclosed therein). Logging activities appear to be small-scale, but widespread across the entire range (Global Forest Watch 2023), and it has been hypothesised that the overall rate of habitat loss exceeds the rate of tree cover loss substantially due to the additive impacts of forest degradation (Renjifo et al. 2016). Tentatively, the rate of population decline over the past ten years is here placed in the band 20-29% (per Renjifo et al. 2016).
Rates of habitat loss appear to have started accelerating in c.2017 (Global Forest Watch 2023). It is projected that as a consequence of deforestation, the species will lose an additional 60% of its habitat between 2015 and 2040 (Negret et al. 2021). Assuming an exponential rate of decline, this equates to a rate of habitat loss of 46% over the next ten years. Further assuming that population declines are roughly equivalent to the rate of habitat loss, they are here placed in the band 30-49% over the next ten years.
Pogonotriccus lanyoni occurs locally on the east and north slopes of the central Andes in Antioquia and adjacent Risaralda, Caldas, as well as Cundinamarca and adjacent Boyacá, Colombia.
The species inhabits semi-deciduous foothill forest (Stiles et al. 1999). Observations have been made in tall second growth, regenerating, natural tree gaps, and disturbed remnant forest (O. Cortes in litt. 2007). It is often in mosaics of these habitat-types and pastoral or cultivated land (Stiles et al. 1999), although this use of habitat may reflect availability rather than preference. Nesting has been recorded in March (P. G. W. Salaman in litt. 1999). It often joins mixed-species flocks (P. G. W. Salaman in litt. 1999, F. G. Stiles in litt. 1999, Schulenberg and Kirwan 2022). Apart from some anecdotal observations its ecology and behaviour are not well known (Schulenberg and Kirwan 2022).
Livestock-farming, arable cultivation, logging, infrastructure development and gold mining have all played a part in the destruction of habitat in its range (Stiles et al. 1999, Renjifo et al. 2016). Even though the species shows some tolerance of disturbance and is also found in mature secondary habitats, small-scale loss and degradation of forests throughout the range is accelerating and driving population declines (Renjifo et al. 2016, Negret et al. 2021, Schulenberg and Kirwan 2022).
Conservation Actions Underway
No targeted actions are known.
Conservation Actions Proposed
Search for the species in potentially suitable habitat to clarify the distribution range. Conduct surveys to accurately quantify the population size. Systematically study its ecological requirements and behaviour. Monitor the population trend. Monitor rates of habitat loss. Protect areas of suitable habitat within the range. Consider restoring native vegetation.
11 cm. Bright yellow-and-olive flycatcher with contrasting grey crown. Incomplete eye-ring. Duskier wings and tail with two yellow wing-bars. Bright yellow underparts. Small, thin bill, black maxilla, flesh lower mandible. Similar spp. Spectacled Bristle-tyrant P. orbitalis has complete eye-ring, narrower whitish-yellow wing-bars, yellowish-olive underparts, and grey crown blending into greenish back. Marble-faced Bristle-tyrant P. ophthalmicus is larger, with distinct black auricular patch. Voice Song recalls other Pogonotriccus: a short, stuttering, descending trill, lasting c. 2 sec., ending with a few longer sweep notes at a slightly higher pitch. Calls comprise sharp dry chit or softer tsip notes.
Text account compilers
Hermes, C.
Contributors
Cortés, O., Isherwood, I., Khwaja, N., Mark, T., Pople, R., Salaman, P.G.W., Sharpe, C.J., Stiles, E., Stuart, T. & Symes, A.
Recommended citation
BirdLife International (2024) Species factsheet: Antioquia Bristle-tyrant Pogonotriccus lanyoni. Downloaded from
https://datazone.birdlife.org/species/factsheet/antioquia-bristle-tyrant-pogonotriccus-lanyoni 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.