Data Zone
Justification of Red List category
This species has a very 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 has not been quantified, 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. The species is described as rare to locally uncommon, but possibly overlooked (Stotz et al. 1996, Krabbe et al. 2020).
Trend justification
Although precise data are unavailable, populations are suspected to be declining slowly owing to continuing habitat loss and degradation within the range.
Tree cover within the range is lost at a rate up to 7% over ten years (Global Forest Watch 2021, using Hansen et al. [2013] data and methods disclosed therein). As the species appears to tolerate a certain level of habitat degradation and is often found in secondary vegetation (Krabbe et al. 2020, WikiAves 2021), population declines are unlikely to be fast; they are tentatively placed in the band 1-9% over ten years.
Psilorhamphus guttatus occurs in south-east Brazil (Espírito Santo and Minas Gerais through Rio de Janeiro, São Paulo south to Paraná, Santa Catarina and Rio Grande do Sul) and in adjacent north-east Argentina (Misiones) (Ridgely and Tudor 1994, Parker et al. 1996).
This species inhabits lowland humid forest and secondary woodland up to 1,000 m. It is mostly confined to large stands of bamboo at the edge of dense secondary growth, but also occurs in vine tangles and other dense vegetation away from bamboo (Ridgely and Tudor 1994, J. Mazar Barnett in litt. 2000, Krabbe et al. 2020). It moves mainly by hopping through branches at an average height of 2 m, but may climb higher or come to the ground occasionally (Krabbe et al. 2020). It feeds on insects and larvae (Krabbe et al. 2020).
Agricultural conversion and deforestation for mining and plantation production historically threatened its lowland forests. Current key threats are urbanisation, industrialisation, agricultural expansion, colonisation and associated road-building (Dinerstein et al. 1995, Fearnside 1996, Krabbe et al. 2020).
Conservation Actions Underway
The species occurs in several protected areas throughout its range, including Serra do Mar, Alto do Ribeira, Intervales and Carlos Botelho state parks (Brazil), as well as Iguazú National Park (Argentina). It is listed as Vulnerable at the national level in Argentina (MAyDS & AA 2017).
Conservation Actions Proposed
Conduct surveys of suitable habitats within and surrounding the known range to determine its true distribution and abundance. Conduct ecological studies to determine the species's precise habitat requirements. Investigate threats to the species. Monitor the population trend.
Effectively protect significant areas of suitable forest at key sites, in both strictly protected areas and community led multiple use areas.
Text account compilers
Hermes, C.
Contributors
Butchart, S., Gilroy, J., Mazar Barnett, J. & Sharpe, C.J.
Recommended citation
BirdLife International (2024) Species factsheet: Spotted Bamboowren Psilorhamphus guttatus. Downloaded from
https://datazone.birdlife.org/species/factsheet/spotted-bamboowren-psilorhamphus-guttatus on 23/11/2024.
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 23/11/2024.