Archived 2017 topics: White-bellied Barbet (Lybius leucogaster): uplist to Endangered or Vulnerable?

BirdLife species factsheet for White-bellied Barbet: http://datazone.birdlife.org/species/factsheet/white-bellied-barbet-lybius-leucogaster

 

White-bellied Barbet, Lybius leucogaster, is currently listed as Least Concern on the basis that it was thought that it did not approach the threshold for Vulnerable under any criterion. This species is thought to occur only in the highlands of south-western Angola, and requires woodland habitats (del Hoyo et al. 2016). However, within its range large areas have been deforested and forest loss continues (Hansen et al. 2013; del Hoyo et al. 2016). There has been a lack of any records since the 1970s (M. Mills in litt. 2014), but it is thought that the species will eventually be found in suitable habitat around the Serra da Neve and at the bottom of the Angolan escarpment to the west of Lubango (del Hoyo et al. 2016). However, the species likely warrants listing under a higher threat category than Least Concern.

Using low population density estimates for congeners (given the lack of records) and assuming only a proportion of its range is occupied would give a population size estimate in the range of 2,500-9,999 mature individuals. However, the paucity of remaining forest cover in its range and the fact that it has not been recorded for so long means that the population size estimate may be even lower than this and may instead fall below 2,500 mature individuals. The continued loss of forest within L. leucogaster’s range means that any possible remaining population is likely in decline, and so this species qualifies at least as Vulnerable under criterion C2a(ii), and potentially as Endangered under the same criterion pending further comments regarding population size estimates.

Any further comments and information regarding this proposed uplisting are welcomed.

References

del Hoyo, J., Collar, N. & Kirwan, G.M. (2016). White-bellied Barbet (Lybius leucogaster). 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/467451 on 22 December 2016).

Hansen, M. C., P. V. Potapov, R. Moore, M. Hancher, S. A. Turubanova, A. Tyukavina, D. Thau, S. V. Stehman, S. J. Goetz, T. R. Loveland, A. Kommareddy, A. Egorov, L. Chini, C. O. Justice, and J. R. G. Townshend. 2013. High-Resolution Global Maps of 21st-Century Forest Cover Change. Science 342: 850–53. Data available on-line from: http://earthenginepartners.appspot.com/science-2013-global-forest. Accessed through Global Forest Watch on [22/12/2016]. www.globalforestwatch.org.

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2 Responses to Archived 2017 topics: White-bellied Barbet (Lybius leucogaster): uplist to Endangered or Vulnerable?

  1. Michael Mills says:

    Further searches in January this year, at the base of Serra da Neve, failed to turn up any species, although for logistical reasons I only had an afternoon to search for it there.

    Given the number of specimens collected in the vicinity of Lubango in the 1970s, and the fact that it almost certainly no longer occurs in that area (extensive searches have failed to produce any records), it certainly has undergone a major decline it an important part of its range.

    It is certainly a mystery as to why it has become so rare – congeners in East and West Africa are fairly tolerant of habitat degradation and often found in farming areas. Personally I think Data Deficient or Endangered are the most suitable classifications. Based on what we have seen so far it could be anywhere between Vulnerable and Critically Endangered.

  2. Andy Symes (BirdLife) says:

    Preliminary proposals

    Based on available information, our preliminary proposal for the 2017 Red List would be to list:

    White-bellied Barbet as Endangered under criterion C2a(i).

    There is now a period for further comments until the final deadline of 4 August, after which the recommended categorisations will be put forward to IUCN.
    Please note that we will then only post final recommended categorisations on forum discussions where these differ from the initial proposal.

    The final 2017 Red List categories will be published on the BirdLife and IUCN websites in early December, following further checking of information relevant to the assessments by both BirdLife and IUCN.

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