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.
Marcapata Spinetail (Cranioleuca marcapatae) is being split into Cranioleuca marcapatae and C. weskei, following the application of criteria set out by Tobias et al. (2010).
Prior to this taxonomic change, C. marcapatae (http://www.birdlife.org/datazone/species/factsheet/22702438) was listed as Vulnerable under criterion A3c because modelling of future deforestation rates in the Amazon basin (Soares-Filho et al. 2006, Bird et al. 2011) meant the taxon was suspected to rapidly decline over the next three generations. This species was described as ‘fairly common’ (del Hoyo et al. 2003).
C. marcapatae, (as defined following the taxonomic change) is found in the Vilcanota and Carabaya ranges of Cuzco, Peru (del Hoyo et al. 2003), with an Extent of Occurrence of 25,230km2. There are no population estimates for this species. It is dependent on primary forest, and so may be susceptible to habitat fragmentation and edge effects. Therefore, given projected current and future deforestation rates (Bird et al. 2011), this species will likely qualify as Vulnerable under criterion A3c+A4c.
C. weskei is found in the Vilcabamba Mountains of Cuzco, Peru (del Hoyo et al. 2003), and has recently been recorded in North-East Ayacucho and Junin (Hosner et al. 2015). Its Extent of Occurrence is 33,000 km2. There are no population estimates for this species. It is dependent on primary forest, and so may be susceptible to habitat fragmentation and edge effects. Given its larger range than C. marcapatae it may be less threatened, but habitat loss is still suspected to be affecting this species. As such it is proposed that it be listed as Near Threatened under criterion A3c+A4c, unless further information is available.
Any further information regarding current deforestation rates in this region and population estimates for these species would be welcomed, and comments are invited on these proposed categories.
Bird, J. P.; Buchanan, J. M.; Lees, A. C.; Clay, R. P.; Develey, P. F.; Yépez, I.; Butchart, S. H. M. 2011. Integrating spatially explicit habitat projections into extinction risk assessments: a reassessment of Amazonian avifauna incorporating projected deforestation. Diversity and Distributions 18: 273-281.
del Hoyo, J.; Elliott, A.; Christie, D. 2003. Handbook of the Birds of the World, vol. 8: Broadbills to Tapaculos. Lynx Edicions, Barcelona, Spain.
Hosner, P.A., Andersen, M.J., Robbins, M.B., Urbay-Tello, A., Cueto-Aparicio, L., Verde-Guerra, K., Sánchez-González, L.A., Navarro-Sigüenza, A.G., Boyd, R.L., Núñez, J., Tiravanti, J., Combe, M., Owens, H.L. & Peterson, A.T. (2015) Avifaunal surveys of the upper Apurímac river valley, Ayacucho and Cuzco Departments, Peru: new distributional records and biogeographic, taxonomic, and conservation implications. Wilson Journal of Ornithology 127(4): 563–581.
Soares-Filho, B.S.; Nepstad, D.C.; Curran, L.M.; Cerqueira, G.C.; Garcia, R. A.; Ramos, C. A.; Voll, E.; McDonald, A.; Lefebvre, P.; Schlesinger, P. 2006. Modelling conservation in the Amazon basin. Nature 440(7083): 520-523.
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.
James Westrip and Rob Martin (BirdLife International)