This is part of a consultation on the Red List implications of extensive changes to BirdLife’s taxonomy for passerines
Lynx Edicions and BirdLife International will soon publish the second volume of the HBW-BirdLife Illustrated Checklist of the Birds of the World, building off the Handbook of the Birds of the World series, and BirdLife’s annually updated taxonomic checklist.
The new Checklist will be based on the application of criteria for recognising species limits described by Tobias et al. (2010). Full details of the specific scores and the basis of these for each new taxonomic revision will be provided in the Checklist.
Following publication, an open and transparent mechanism will be established to allow people to comment on the taxonomic revisions or suggest new ones, and provide new information of relevance in order to inform regular updates. We are also actively seeking input via a discussion topic here regarding some potential taxonomic revisions that currently lack sufficient information.
The new Checklist will form the taxonomic basis of BirdLife’s assessments of the status of the world’s birds for the IUCN Red List. The taxonomic changes that will appear in volume 2 of the checklist (for passerines) will begin to be incorporated into the 2016 Red List update, with the remainder to be incorporated into subsequent Red List updates.
Preliminary Red List assessments have been carried out for the newly split or lumped taxa. We are now requesting comments and feedback on these preliminary assessments.
Olive Tanager Chlorothraupis carmioli is being moved into genus Habia and split into H. carmioli and H. frenata, following the application of criteria set out by Tobias et al. (2010).
Prior to this taxonomic change, Olive Tanager was listed as Least Concern, on the basis that it did not approach the threshold for Vulnerable under any criterion. Habia carmioli (as defined following the taxonomic change) is found in the undergrowth of wet and humid lowland forest and secondary growth or forest edge from eastern Nicaragua south to the extreme north-west of Colombia (Hilty 2016a). It is fairly common to common, but its lowland distribution makes it at risk from habitat disturbance (Hilty 2016a). Deforestation to make way for agriculture and human settlements has led to population fragmentation and declines in this species. However, these declines are unlikely to be sufficient to warrant listing as Vulnerable, and so it is proposed that this species is listed as Least Concern.
H. frenata is found in foothill and pre-montane forest on the eastern side of the Andes of Peru and western-central Bolivia, south Colombia, and northern Ecuador as well as the Loja–Zamora Road in the extreme south-east of the country (Hilty 2016b). It is locally fairly common, but there has likely been population declines and fragmentation as a result of extensive deforestation and settlement in its range (Hilty 2016b). Rates of forest loss within the species’s range do not appear sufficient to infer declines at an appropriate rate to warrant listing as Vulnerable (see Global Forest Watch webpage: http://www.globalforestwatch.org/map), and it is likely that this species will not approach the threshold for listing as Vulnerable under any criterion. Therefore, it is proposed that this species be listed as Least Concern, but we would request any further information regarding possible recent or future trends in this species to see whether declines may be large enough for listing as Near Threatened.
Hilty, S. 2016a. Carmiol’s Tanager (Chlorothraupis carmioli). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from http://www.hbw.com/node/61841 on 1 October 2016).
Hilty, S. 2016b. Olive Tanager (Chlorothraupis frenata). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from http://www.hbw.com/node/61842 on 1 October 2016).
Tobias, J. A., Seddon, N., Spottiswoode, C. N., Pilgrim, J. D., Fishpool, L. D. C. and Collar, N. J. 2010. Quantitative criteria for species delimitation. Ibis 152: 724–746.