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, but density descriptions range from uncommon and generally occurring at a low density to locally fairly common (Stotz et al. 1996, Hilty 2020).
Trend justification
The population trend has not been investigated, but the population is feared to decline slowly due to the loss and conversion of its habitat.
Tree cover within the range is lost at a rate of 2% over ten years (Global Forest Watch 2022, using Hansen et al. [2013] data and methods disclosed therein). The species appears to tolerate some habitat degradation and is also found along borders, in secondary growth of various successional stages, as well as in clearings (Hilty 2020). Consequently, any population declines are likely to be extremely low, not exceeding 5% over ten years.
Population declines may however vary across the range: In Ecuador, habitat loss is suspected to be causing moderately rapid declines (Freile et al. 2019), while habitat loss in Colombia is projected to be very slow (Negret et al. 2021).
Tangara johannae occurs in the Pacific lowlands and Andean foothills from north Antioquia and Chocó, Colombia, south through north-west Ecuador to Pichincha and Santo Domingo.
This species occurs in the canopy and at the borders of wet forest and secondary woodland, in young and mature secondary growth, as well as in slashed clearings (Hilty and Brown 1986, Hilty 2020). It is mostly found in coastal lowlands up to 700-800 m, but occasionally to higher altitudes.
The Chocó forests inhabited by this species are threatened by deforestation, largely as a result of logging, conversion for agriculture and livestock pasture, mining and coca and palm cultivation (Stattersfield et al. 1998).
Conservation Actions Underway
The species is listed as Near Threatened at the national level in Ecuador (Freile et al. 2019).
Conservation Actions Proposed
Quantify the population size. Conduct ecological studies to determine precise habitat requirements. Investigate the impact of threats, including the species' tolerance of habitat degradation or fragmentation. 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., Mahood, S., O'Brien, A., Salaman, P.G.W. & Sharpe, C.J.
Recommended citation
BirdLife International (2024) Species factsheet: Blue-whiskered Tanager Tangara johannae. Downloaded from
https://datazone.birdlife.org/species/factsheet/blue-whiskered-tanager-tangara-johannae 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.