Blue-and-black Tanager (Tangara vassorii) | Text

Blue-and-black Tanager Tangara vassorii

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Justification

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 under 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). The population size has not been quantified, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (under 10,000 mature individuals with a continuing decline estimated to be over 10% in ten years or three generations, or with a specified population structure). 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 (over 30% decline over ten years or three generations). For these reasons the species is evaluated as Least Concern.

Population justification
The global population size has not been quantified, but this species was described as 'fairly common', prior to being split (Stotz et al. 1996). This species is considered to have a medium dependency on forest habitat, and tree cover is estimated to have declined by 1.5% within its mapped range over the past 10 years (Global Forest Watch 2022, using Hansen et al. [2013] data and methods disclosed therein). Therefore, as a precautionary measure, it is tentatively suspected that this loss of cover may have led to a decline of between 1-19% in the species' population size over the same time frame.

Trend justification
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Distribution and population

Subspecies T. v. vassorii occurring in the Andes in Venezuela (Trujillo S to Táchira) and throughout Colombia S to Ecuador and E slope in N Peru (S to Piura and Cajamarca N of R Marañón). Subspecies T. v. branickii occurring in the E slope of Andes in Peru S of R Marañón (Amazonas and La Libertad).

Acknowledgements

Text account compilers
Rutherford, C.A.

Recommended citation
BirdLife International (2024) Species factsheet: Blue-and-black Tanager Tangara vassorii. Downloaded from https://datazone.birdlife.org/species/factsheet/blue-and-black-tanager-tangara-vassorii on 17/12/2024.
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 17/12/2024.