Overview

Distribution

Range Description

The species is found in patches of highly fragmented deciduous forest in western Madagascar between the Mahavavy and Manambolo Rivers. The southern limit of its range does not extend to the Tsiribihina River, which marks the northern limit of P. verreauxi. To the north, within the coastal forests that occur between the Betsiboka and Mahavavy Rivers, the geographic separation between P. deckenii and P. coronatus is clear, but not on both sides of the lower reaches of the Mahavavy where the changing river course allows the populations to interchange (Thalmann et al. 2002). More confusing is the situation in forests of the Bongolava Massif, where animals with colour patterns characteristic of both species have been observed; populations of both species also can be found at a number of other sites (Thalmann et al. 2002).
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
This species has yet to be studied in the wild. It is known to be diurnal, inhabits dry deciduous forests, occurs on groups of two to 10 individuals, and is somewhat adaptable to degraded habitat, even being present in Eucalyptus trees in the middle of Soalala town.

Systems
  • Terrestrial
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It lives in dry, deciduous forests.

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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
VU
Vulnerable

Red List Criteria
A2c

Version
3.1

Year Assessed
2008

Assessor/s
Andrainarivo, C., Andriaholinirina, V.N., Feistner, A., Felix, T., Ganzhorn, J., Garbutt, N., Golden, C., Konstant, B., Louis Jr., E., Meyers, D., Mittermeier, R.A., Perieras, A., Princee, F., Rabarivola, J.C., Rakotosamimanana, B., Rasamimanana, H., Ratsimbazafy, J., Raveloarinoro, G., Razafimanantsoa, A., Rumpler, Y., Schwitzer, C., Thalmann, U., Wilmé, L. & Wright, P.

Reviewer/s
Mittermeier, R.A. & Rylands, A.B. (Primate Red List Authority)

Contributor/s

Justification
Listed as Vulnerable as the species is thought to have undergone a reduction of more than 30% over the past 30 years (assuming a generation length of 10 years) due primarily to a decline in area and quality of habitat within the known range of the species. If hunting taboos begin breaking down, then the species could move into a higher category of threat.

History
  • 2000
    Vulnerable
  • 1996
    Vulnerable
    (Baillie and Groombridge 1996)
  • 1996
    Vulnerable
  • 1990
    Vulnerable
    (IUCN 1990)
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Population

Population
Common where present.

Population Trend
Decreasing
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Threats

Major Threats
The main threat to this species is habitat loss, as forests within its range are already very fragmented. Habitat loss continues mainly to provide pasture for livestock and to produce charcoal. It is protected by a very strong taboo in much of its range, becoming very tame as a result.
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Management

Conservation Actions

Conservation Actions
This species is listed on Appendix I of CITES. Occurs in three national parks (Tsingy de Bemaraha, Baie de Baly and Tsingy de Namoroka), the Tsingy de Bemaraha Strict Nature Reserve, and four special reserves (Ambohijanahary, Bemarivo, Kasijy, and Maningoza) (Mittermeier et al. 2008). There are no specimens reported in captivity.
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Wikipedia

Von der Decken's sifaka

Von der Decken's sifaka (Propithecus deckenii) is a sifaka endemic to Madagascar. It has a length of 92 to 107 centimeters, of which 42-48 centimeters are tail.[3] Von der Decken's Sifaka lives in western Madagascar.[3] It lives in dry deciduous forest.[3]

Its pelage is usually creamy white, with tinges of yellow-gold, silver grey or pale brown on the neck, shoulders, back and limbs. The face is entirely black.[3] Group size is between 2 and 10 individuals, with groups of 3 to 6 most common.[3]

References[edit]

  1. ^ Groves, C. P. (2005). Wilson, D. E.; Reeder, D. M, eds. Mammal Species of the World (3rd ed.). Baltimore: Johns Hopkins University Press. OCLC 62265494. ISBN 0-801-88221-4. 
  2. ^ Andrainarivo, C., Andriaholinirina, V. N., Feistner, A., Felix, T., Ganzhorn, J., Garbutt, N., Golden, C., Konstant, B., Louis Jr., E., Meyers, D., Mittermeier, R. A., Perieras, A., Princee, F., Rabarivola, J. C., Rakotosamimanana, B., Rasamimanana, H., Ratsimbazafy, J., Raveloarinoro, G., Razafimanantsoa, A., Rumpler, Y., Schwitzer, C., Thalmann, U., Wilmé, L. & Wright, P. (2008). Propithecus deckenii. In: IUCN 2008. IUCN Red List of Threatened Species. Retrieved 1 January 2009.
  3. ^ a b c d e Garbutt, Nick (2007). Mammals of Madagascar, A Complete Guide. pp. 196–197. 
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