Verreaux’s Coua (Coua verreauxi): downlist to Least Concern?

This discussion was first published as part of the 2013 Red List update, but remains open for comment to enable reassessment in 2014.

BirdLife species factsheet for Verreaux’s Coua

Verreaux’s Coua Coua verreauxi is restricted to south-west Madagascar. It is currently listed as Near Threatened under criterion B1ab(iii) because it was thought likely to have a small range in which the area, extent and quality of habitat were declining. However, mapping of this species’s range suggests that it is larger than previously thought, with an Extent of Occurrence (EOO) of 63,300km2. The population size of this species has not yet been quantified, but the population is suspected to be stable in the absence of evidence for any declines or substantial threats, and described as abundant within suitable habitat. Thus, this species no longer qualifies as Near Threatened under the range size criterion, and may warrant downlisting to Least Concern.

Information is requested on the population size, trends and distribution of this species. Additional comments on the proposed downlisting are also welcome.

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6 Responses to Verreaux’s Coua (Coua verreauxi): downlist to Least Concern?

  1. The post states that the range of the species is greater than previously thought, but it’s not clear what sources this is based on. Note that Raselimanana et al (2012) have extended the range further, recording the species in the Mikea forest 120 km north of the previous known range.;

    Raselimanana, A.P., Raherilalao, M.J., Soarimalala, V., Gardner, C.J., Jasper, L.D., Schoeman, M.C. and Goodman, S.M. 2012. Un premier aperçu de la faune de vertébrés du bush épineux de Salary-Bekodoy, à l’ouest du Parc National de Mikea, Madagascar. Malagasy Nature 6 : 1-23.

    http://www.vahatra.mg/volume6_1/MN%206_Raselimanana%20et%20al.%202012_Vertebres%20Salary.pdf

  2. Joe Taylor says:

    Further examination of BirdLife’s range map for this species has indicated that the Extent of Occurrence (EOO) given in the discussion topic above is erroneous, owing to the duplication of range areas when calculating the EOO.

    Following edits to incorporate Salary-Bekodoy Forest (Raselimanana et al. 2012) and eliminate any duplication in the calculation, a new estimate of 33,600 km2 has been calculated for the EOO. On this basis, it appears to remain the case that the species’s EOO does not approach the threshold for Vulnerable under criterion B1.

  3. Joe Taylor says:

    Further editing of the species range map to follow Safford and Hawkins (2013) has resulted in an EOO of c.20,300 km2, and is thus now deemed to approach the EOO threshold for Vulnerable.

    Reference:

    Safford, R. J. and Hawkins, A. F. A. (Eds.) (2013) The Birds of Africa. Volume VIII: The Malagasy Region. London, UK: Christopher Helm.

  4. Andy Symes says:

    Preliminary proposals

    Based on available information and comments posted above, our preliminary proposal for the 2014 Red List would be to treat Verreaux’s Coua Coua verreauxi as Near Threatened, approaching the threshold for classification as Vulnerable under criterion B1ab(iii).

    There is now a period for further comments until the final deadline of 31 March, after which recommended categorisations will be put forward to IUCN.

    The final Red List categories will be published on the BirdLife and IUCN websites in mid-2014, following further checking of information relevant to the assessments by both BirdLife and IUCN.

  5. Andy Symes says:

    Recommended categorisation to be put forward to IUCN

    Following further review, there has been no change to our preliminary proposal for the 2014 Red List status of this species.

    The final categorisation will be published later in 2014, following further checking of information relevant to the assessment by BirdLife and IUCN.

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