This discussion was first published on Dec 2 2010 as part of the 2010-2011 Red List update.
Initial deadline for comments: 31 January 2012.
Blue-and-gold Tanager Bangsia arcaei is currently listed as Near Threatened under criteria A2c; A3c; A4c; B1a+b(i,ii,iii,iv,v) because, although its Extent of Occurrence (EOO) is less than 20,000 km2 and declines are suspected in its range owing to habitat clearance and degradation, and its population is suspected to be experiencing a moderately rapid decline owing to the same threats, the population, however, is not yet considered to be severely fragmented or restricted to a few locations.
The latest population estimate for this species in Costa Rican Important Bird Areas of 2,500-3,900 mature individuals (Sánchez et al. 2009) suggests that the total population could number fewer than 10,000 mature individuals, potentially making the species eligible for uplisting to Vulnerable under criteria C1 and C2. However, to qualify the species must be shown to be experiencing a continuing decline of at least 10% over 11 years (estimate of three generations), or at least have a population decline inferred, combined with the knowledge that all mature individuals are in one sub-population (or that all sub-populations number no more than 1,000 individuals).
Up-to-date information is requested on this species’s likely total population size, population trend and threats. Particular detail is requested on the level of habitat fragmentation within its range, i.e. the percentage of suitable habitat in patches too small to support viable populations.
Sánchez, J. E., Criado, J., Sánchez, C. and Sandoval, L. (2009) Costa Rica. In Devenish, C., Díaz Fernández, D. F., Clay, R. P., Davidson, I. J. and Yépez Zabala, I. eds. Important Bird Areas Americas – Priority sites for biodiversity conservation. Quito, Ecuador: BirdLife International (BirdLife Conservation Series No. 16).