Archived 2012-2013 topics: Dwarf Tinamou (Taoniscus nanus): downlist to Near Threatened or Least Concern?

BirdLife species factsheet for Dwarf Tinamou Dwarf Tinamou Taoniscus nanus is currently restricted to the “cerrado” (tropical savanna) of central and south-east Brazil in Distrito Federal, Goiás, Minas Gerais, Mato Grosso do Sul, Tocantins, São Paulo and formerly Paraná (L. F. Silveira in litt. 2012). In 2008, it was found in relatively degraded but extensive cerrado south of Araguainha, Mato Grosso (Kirwan 2009). A specimen is known from Misiones, Paraguay, and two were taken in Argentina in the early 1900s (M. Pearman in litt. 1999), from near the río Bermejo in either Chaco or Formosa, but there have been no further records from the country. It is currently listed as Vulnerable under criteria A2c+3c+4c; C1, as it is suspected to be undergoing rapid continuing declines owing to an on-going reduction in available habitat. The population is estimated to number 2,500-9,999 mature individuals, based on an assessment of known records, descriptions of abundance and range size. However, most of the extant population is found within protected areas in Brazil (L. F. Silveira in litt. 2012), including Serra da Canastra National Park, Itapetininga Experimental Station and the IBGE Roncador Biological Reserve. Information suggests that in recent years, no significant population reduction in these areas was observed and thus, the global population may no longer be in decline (L. F. Silveira in litt. 2012). If this information is confirmed, this species would no longer qualify as Vulnerable under IUCN Red List criteria. If there is sufficient evidence to suggest that the population reduction of this species is likely to have approached  30% over the past three generations (20 years in this species), it would warrant downlisting to Near Threatened under criterion A2c, based on a past decline in area of occupancy, extent of occurrence and/or quality of habitat. If this species is still continuing to decline, but at a rate approaching 10% over 20 years, and the population is <10,000 mature individuals, it would qualify as Near Threatened under criterion C1. Should there be sufficient evidence to suggest that the population is no longer undergoing continuing declines at a rate approaching 10% in 20 years, and has not declined at a rate approaching 30% in the past 20 years this species would qualify as Least Concern on the basis that it does not approach the thresholds for Vulnerable under any of the IUCN Red List criteria. Further information is required on this species’s population trends, distribution and size. Additional comments on the proposed downlisting are also welcome. Reference: Kirwan, G, M. (2009) Report on a search for the Hooded Seedeater Sporophila melanop, with some remarks on its validity. Unpublished report to BirdLife International. 9pp.

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3 Responses to Archived 2012-2013 topics: Dwarf Tinamou (Taoniscus nanus): downlist to Near Threatened or Least Concern?

  1. Fábio Olmos says:

    It must be remembered projections suggest the Cerrado will be gone by 2030, especially the open formations this species rely on. So, assuming populations are no longer in decline is bogus. The Brazilian protected are far from being protected. Catastrophic fires are common in parks such as Serra da Canastra and Emas, and coupled with isolation, climate change and other factors may render those metapopulations vulnerable to local extinction as has happened in isolated cerrado areas in its southern range (São Paulo – there are no recent records from Itapetininga I am aware of). Also, protected areas in Brazil are being scrapped and Serra da Canastro is due to lose part of its original 200k ha. I suggest a look at http://www.abeco.org.br/wordpress/wp-content/uploads/nec-vol-8-1/natcon.00801005.pdf for a general view of open cerrado birds and
    http://www.wikiaves.com.br/inhambu-carape for recent records of the species. Notice http://www.wikiaves.com is a valuable tool to plot recent records of ALL Brazilian birds.

  2. Alexander C. Lees says:

    Agree strongly with Fabio, these taxa (e.g. also Cock-tailed Tyrant, Black-masked Finch) of open cerrado formations are now known pretty much only from a few widely-spaced localities and mostly in PAs. These PAs are however subject to serve degradation events such as escaped fires and are no guarantee of future persistence. Given the ongoing loss and degradation of habitat I doubt populations are ‘stable’.

  3. Tulio Dornas says:

    A porção leste do estado de Tocantins (entre a margem direita do rio Tocantins e a divisa com os estados da Bahia, Piaui e Maranhão) apresenta ainda grande blocos naturais de ambientes savânicos do bioma Cerrado potencial a presença de população representativa da espécie, de modo que, existem hoje mais de 2.000.000ha de unidades de conservação na região. Por outro lado, as queimadas em regime anuais, e até mesmo bianuais, tem ameaçado a integridade de todos os campos de cerrado do leste do Tocantins, dentro ou fora de áreas protegidas. Para piorar essa mesma região foi descoberta pelos projetos de silvicultura (Eucalipto) e são esperados mais de 1 milhão de hectares de florestas de eucalipto, das quais quase todas são resultados da conversão de áreas naturais e áreas de plantio. O plantio de monoculturas de soja está em franco crescimento e é possível que nos próximos anos haja um aumento significativo no plantio de cana-de-açúcar, já que usinas de álcool e açúcar tem se instalado na região.

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