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Chiropotes albinasus

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA CHORDATA MAMMALIA PRIMATES PITHECIIDAE

Scientific Name: Chiropotes albinasus
Species Authority: (I. Geoffroy & Deville, 1848)
Common Name/s:
English Red-nosed Bearded Saki, Red-nosed Saki, White-nosed Bearded Saki, White-nosed Saki
French Saki À Nez Blanc
Spanish Cuxiú, Saki Nariblanco
Taxonomic Notes: Taxonomy follows Hershvovitz (1985).

Assessment Information [top]

Red List Category & Criteria: Endangered A3cd ver 3.1
Year Published: 2008
Date Assessed: 2008-06-30
Assessor/s: Veiga, L.M., Pinto, L.P., Ferrari, S.F., Rylands, A.B., Mittermeier, R.A. & Boubli, J.-P.
Reviewer/s: Mittermeier, R.A., Rylands, A.B. (Primate Red List Authority) & Hoffmann, M. (Global Mammal Assessment Team)
Justification:
Listed as Endangered as there is reason to believe this species will decline by at least 50% over the coming 30 years (three generations) due mainly to the expanding agricultural frontier in this region, combined with the effects of hunting.
History:
2003 Least Concern
2003 Least Concern (IUCN 2003)
1994 Vulnerable (Groombridge 1994)
1990 Vulnerable (IUCN 1990)
1988 Vulnerable (IUCN Conservation Monitoring Centre 1988)
1986 Vulnerable (IUCN Conservation Monitoring Centre 1986)
1982 Vulnerable (Thornback and Jenkins 1982)

Geographic Range [top]

Range Description: In the south and west of its range it appears to have an unusual distribution. It is absent from the Jiparaná-Marmoré interfluvium (between the Rios Mamoré, Madeira and Jiparaná and Serra dos Pacaás Novos in the south), and from areas of terra firme forest south of Serra dos Pacaás Novos; as such, it is excluded from almost two-thirds of the state of Rondônia (Ferrari and Lopes 1992; Ferrari et al. 1999). Unexpectedly, it occurs further south in transitional, savanna-like forest (Ferrari et al. 1999), extending south as far as the east bank of the Rio Guaporé in extreme southern Rondônia, on the border with Bolivia (Wallace et al. 1996). Ferrari and colleagues (1999) suggest that ecological factors, rather than physical barriers, limit the distribution of Chiropotes albinasus in this area, possibly linked to competition with the region's other pitheciine species, Pithecia irrorata.
Countries:
Native:
Brazil
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: This species occurs at low densities and appears to require large areas of continuous forest with high fruit productivity (Pinto and Setz 2005). From studies based on standardized line transects, population densities have been calculated for a number of areas (Table 1).
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: The preferred habitat is high terra firme forest; however, the species has been observed occasionally in fragmented areas and inundated forests (Ayres 1981; Wallace et al. 1996; Ferrari et al. 2003), and vegetation at the transition between forest and savanna (Ferrari et al. 1999).

This is a specialized seed predator and a highly frugivorous species, with as much as 90% of the diet composed of fruits (Ayres 1981; Pinto in press). In the Floresta Nacional do Tapajós (Flona Tapajós), immature seeds were the most important food item (48%), followed by mature fruit pulp (39%) and flowers (5%); matures seeds, immature pulp and invertebrates and other dietary items were eaten in smaller quantities. The most important plant families in the diet were Sapotaceae, Lecythidaceae and Moraceae (Pinto in press.). In Aripuanã, Ayres (1981) observed groups with 19 to 26 individuals. A group studied in Flona Tapajós had 56 members and used an estimated area of 1,000 ha in an 11-month study (Pinto, 2008).
Systems: Terrestrial

Threats [top]

Major Threat(s): The Trans-Amazon highway bisects the range of this species from east to west and, perhaps more importantly, the Santarém-Cuiabá highway (BR-163) makes most of the Xingu-Tapajós interfluvium easily accessible from the south. In recent years, this highway has become the main channel of colonization for soybean planters migrating northwards from Mato Grosso, although for the time being, this threat is limited to a relatively small proportion of the species’ range. Soybean farms contribute directly to forest clearing, but also provide the economic and political impetus for the development of new roads and infrastructure projects which accelerate rates of deforestation by other actors (Fearnside 2007). Cattle ranching is also an important threat. The species is hunted for food and occasionally for its tail (for use as dusters).

Conservation Actions [top]

Conservation Actions: This species occurs in the Parque Nacional da Amazônia [Tapajós] (10,000 km²), and Floresta Nacional do Tapajós (Flona Tapajós).
It is listed on CITES Appendix I.
Citation: Veiga, L.M., Pinto, L.P., Ferrari, S.F., Rylands, A.B., Mittermeier, R.A. & Boubli, J.-P. 2008. Chiropotes albinasus. In: IUCN 2013. IUCN Red List of Threatened Species. Version 2013.2. <www.iucnredlist.org>. Downloaded on 23 April 2014.
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