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.
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.
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.