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 2013 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.
Buff-rumped Woodpecker Meiglyptes tristis is being split into M. tristis and M. grammithorax, following the application of criteria set out by Tobias et al. (2010).
Prior to this taxonomic change, M. tristis (BirdLife species factsheet) was listed as Least Concern on the basis that it was not thought to approach the thresholds for Vulnerable under any of the IUCN criteria. This species was estimated to have an extremely large range, and hence did not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence of less than 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). Despite the fact that the population trend appeared to be negative, the decline was not believed to be sufficiently rapid to approach the thresholds for Vulnerable under the population trend criterion (at least a 30% decline over ten years or three generations). The population size has not been quantified, but it was not believed to approach the thresholds for Vulnerable under the population size criterion (fewer than 10,000 mature individuals with a continuing decline estimated to be at least 10% over ten years or three generations, or with a specified population structure).
M. tristis (as defined following the taxonomic change) is endemic to western Java, where it occupies a variety of forest and woodland habitats, apparently including modified areas (Winkler et al. 1995, del Hoyo et al. 2002). It may qualify as Endangered under criterion C2a(ii), on the basis that there are likely to be fewer than 2,500 mature individuals, based on the species’s scarcity, probably forming a single subpopulation, which is inferred to be in on-going decline owing to the overall negative effects of continued deforestation and other forms of habitat modification.
M. grammithorax is found in the Thai-Malay Peninsula, Sumatra and Borneo (and several of their satellite islands), where it occupies primary and secondary forest, preferring forest edges and clearings, and is found in other modified habitats such as plantations and orchards (Winkler et al. 1995, del Hoyo et al. 2002). It is likely to warrant listing as Least Concern, on the basis that it is not thought to approach the thresholds for Vulnerable under any of the IUCN criteria.
Comments on these suggested categories are invited and further information would be welcomed.
References:
del Hoyo, J., Elliott, A. and Sargatal, J. (2002) Handbook of the birds of the world, Vol 7: Jacamars to Woodpeckers. Barcelona, Spain: Lynx Edicions.
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.
Winkler, H., Christie, D. A. and Nurney, D. (1995) Woodpeckers: a guide to the woodpeckers, piculets and wrynecks of the world. Robertsbridge, U.K.: Pica Press.
Related posts:
- Grey-faced Woodpecker (Picus canus) is being split: list P. dedemi as Near Threatened?
- Tahiti Kingfisher (Todiramphus veneratus) is being split: list T. youngi as Endangered?
- Green-backed Kingfisher (Actenoides monachus) is being split: list both A. monachus and A. capucinus as Near Threatened?
- Brown Hawk-owl (Ninox scutulata) is being split: list N. randi as Near Threatened?
- Scaly Kingfisher (Actenoides princeps) is being split: list A. regalis as Vulnerable and A. princeps as Near Threatened?
