Archived 2017 topics: Pectoral Antwren (Herpsilochmus pectoralis): downlist from VU to NT or LC?

This discussion was first published as part of the 2016 Red List update. At the time a decision regarding its status was pended, but to enable potential reassessment of this species as part of the 2017 Red List update this post remained open and the date of posting was updated.

BirdLife species factsheet for Pectoral Antwren

Pectoral Antwren is endemic to eastern Brazil, from Maranhão south to Bahia. The species is listed as Vulnerable under A2c+3c+4c; B1ab(i,ii,iii,iv,v); C2a(i). The widespread destruction of suitable deciduous forest has rapidly reduced this species’s now small population and (poorly understood) range (Collar et al. 1992). Remaining populations are severely fragmented. The population is estimated at 2,500-9,999 mature individuals with the population estimated to be undergoing a rapid population decline. The species’s extent of occurrence (EOO) is estimated to be 8,600 km2.

Conversely on the Brazilian Red List for birds (MMA 2014) this species is listed as Least Concern, implying that the population decline does not approach <30% in 14 years (three generations), the EOO is >20,000 km2 (or not severely fragmented/at few locations), and the number of mature individuals is >10,000.

Evidence to show that the species no longer meets the thresholds for Vulnerable under criterion A, B or C would likely qualify the species for downlisting to Near Threatened or Least Concern. Up-to-date information is requested on the species’s population size, population trend and geographic range. Comments on the proposed downlisting are welcome.

References:

Collar, N. J.; Gonzaga, L. P.; Krabbe, N.; Madroño Nieto, A.; Naranjo, L. G.; Parker, T. A.; Wege, D. C. 1992. Threatened birds of the Americas: the ICBP/IUCN Red Data Book. International Council for Bird Preservation, Cambridge, U.K.

MMA (2014) Lista Nacional Oficial de Espécies da Fauna Ameaçadas de Extinção. Portaria No 444, de 17 de dezembro de 2014. Diário Oficial da União – Seção 1. Nº 245, quinta-feira, 18 de dezembro de 2014.

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3 Responses to Archived 2017 topics: Pectoral Antwren (Herpsilochmus pectoralis): downlist from VU to NT or LC?

  1. James Westrip (BirdLife) says:

    Based on available information, our proposal for the 2016 Red List would be to pend the decision on this species and keep this discussion open until 2017, while leaving the current Red List category unchanged in the 2016 update.

    Final 2016 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.

  2. Bret Whitney says:

    Pectoral Antwren has disappeared from a massive part of its former range, owing to loss of its woodland habitat, and the situation since 1992 has not improved, only worsened, even as we have learned more about where it occurs in Maranhão/Piauí. I think it would be a mistake to downlist it.

  3. Hannah Wheatley (BirdLife) says:

    Preliminary proposals

    Based on available information, our preliminary proposal for the 2017 Red List would be to list:
    Herpsilochmus pectoralis as VU under criteria B2ab(i,ii,iii,iv,v); 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.

Comments are closed.