Hudson’s Canastero Asthenes hudsoni is currently listed as Least Concern on the basis that it does not approach the thresholds for Vulnerable under any of the IUCN criteria.
This species has an Extent of Occurrence (EOO) estimated at 590,000 km2, and hence does not approach the thresholds for Vulnerable under the range size criterion (EOO 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). The population trend is apparently not known, but the population is not believed to be decreasing sufficiently rapidly to approach the thresholds under the population trend criterion (at least a 30% decline over ten years or three generations). The population size has apparently not been quantified, but it is 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).
Despite its global status as Least Concern, this species is considered ‘vulnerable’ at the national level in Argentina, although in this assessment the categories and criteria differed markedly from those provided by the IUCN (López-Lanús et al. 2008). Its status in Argentina, where it is considered rare (J. Lowen in litt. 2009), is thus considered at risk of worsening (López-Lanús et al. 2008). It is also rare in Uruguay, with only about 10 records as of August 2009 (J. Aldabe in litt. 2009). In Uruguay at least, the species’s population density is potentially being reduced by conversion of its habitat to pasture and cultivation.
With these observations in mind, up-to-date information is requested for this species, including details of its likely population size, estimated population trend over 11 years (estimate of three generations) and the severity of potential threats. Any new information on this species will help in the evaluation of its global threat status.
López-Lanús, B., Grilli, P., Di Giacomo, A. S., Coconier, E. E. and Banchs, R. eds. (2008) Categorización de las aves de La Argentina según su estado de conservación. Informe de Aves Argentinas/AOP y la Secretraría de Ambiente y Desarrollo Sustentable. Buenos Aires, Argentina: Aves Argentinas/AOP.