The initial deadline for comments on this topic is 10 March 2014, and is therefore later than for most other topics currently under discussion.
This is part of a consultation on the Red List implications of extensive changes to BirdLife’s taxonomy for non-passerines
Lynx Edicions and BirdLife International will soon publish 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 1 of the checklist (for non-passerines) will begin to be incorporated into the 2014 Red List update, with the remainder, and those for passerines (which will appear in volume 2 of the checklist), 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.
Green Parakeet Aratinga holochlora and Socorro Parakeet A. brevipes are being lumped as A. holochlora, following the application of criteria set out by Tobias et al. (2010).
Prior to this taxonomic change, A. holochlora (BirdLife species factsheet) was listed as being of Least Concern, on the basis that it was not thought to approach the thresholds for Vulnerable under any of the IUCN Red List criteria. A. brevipes (BirdLife species factsheet) was listed as Endangered under criteria B1ab(ii,iii,v)+2ab(ii,iii,v);C2a(i,ii);D1, because of its very small, declining population, and very small range on one island.
A. holochlora (as defined following the taxonomic change) is distributed from southern Texas and northern Mexico (including Socorro Island) south through the Middle American isthmus to south-western Nicaragua, and occurs in a variety of wooded habitats (Juniper and Parr 1998). An overall decline in the population of the nominate form is thought to have occurred in recent decades owing to the expansion of intensive agriculture, and the species is known to be traded in small numbers locally and internationally (Juniper and Parr 1998). However, its use of modified habitats probably buffers the population to some extent against the negative impacts of degradation and fragmentation in natural habitats. It is suggested that the species be listed as being of Least Concern, on the basis that it does not approach the thresholds for Vulnerable under any of the IUCN Red List criteria.
Comments are invited on this suggested category and further information would be welcomed.
Juniper, T. and Parr, M. (1998) Parrots: a guide to the parrots of the world. Robertsbridge, UK: Pica Press.
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.