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
An inhabitant of dry deciduous forest patches. It seems to be fairly resilient to degradation of habitat; individuals have even been observed in Eucalyptus trees in the middle of Soalala town. This species has not been studied in the wild, though it is believed to occur in groups of 2–10 individuals. This species has suffered an approximate 25% loss in its habitat range over the last 3 years (J. Razafindramanana pers. comm).



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
EN
Endangered

Red List Criteria
A2cd+3cd+4cd

Version
3.1

Year Assessed
2014

Assessor/s
Andriaholinirina, N., Baden, A., Blanco, M., Chikhi, L., Cooke, A., Davies, N., Dolch, R., Donati, G., Ganzhorn, J., Golden, C., Groeneveld, L.F., Irwin, M., Johnson, S., Kappeler, P., King, T., Lewis, R., Louis, E.E., Markolf, M., Mass, V., Mittermeier, R.A., Nichols, R., Patel, E., Rabarivola, C.J., Raharivololona, B., Rajaobelina, S., Rakotoarisoa, G., Rakotomanga, B., Rakotonanahary, J., Rakotondrainibe, H., Rakotondratsimba, G., Rakotondratsimba, M., Rakotonirina, L., Ralainasolo, F.B., Ralison, J., Ramahaleo, T., Ranaivoarisoa, J.F., Randrianahaleo, S.I., Randrianambinina, B., Randrianarimanana, L., Randrianasolo, H., Randriatahina, G., Rasamimananana, H., Rasolofoharivelo, T., Rasoloharijaona, S., Ratelolahy, F., Ratsimbazafy, J., Ratsimbazafy, N., Razafindraibe, H., Razafindramanana, J., Rowe, N., Salmona, J., Seiler, M., Volampeno, S., Wright, P., Youssouf, J., Zaonarivelo, J. & Zaramody, A.

Reviewer/s
Schwitzer, C. & Molur, S.

Contributor/s

Justification

Listed as Endangered as the species is suspected to have undergone a population reduction of ≥50% over the past 52.5 years (three generations, assuming a generation length of 17.5 years) due primarily to observed and inferred continuing decline in area, extent and quality of habitat due to burning of forests to provide pasture for livestock, logging for charcoal production and fragmentation.These causes have not ceased, and will to a large extent not be easily reversible. A future population reduction of ≥50% over a 52.5 year period is also suspected due to the same causes and increased hunting with changes in values and breakdown of the taboo system. Assuming population reductions to continue, this species may need to be uplisted to Critically Endangered in the near future.


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

Population
The species is relatively common where it is present; however population figures are in decline due to habitat destruction.

Population Trend
Decreasing
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Threats

Major Threats
Forests within this species’ range are already highly fragmented, and continued habitat loss is the greatest threat to its survival. Habitat is burned to provide pasture for livestock and cut for charcoal production. Hunting is rare as the animals are protected by a very strong taboo over much of their range (leading them to become very tame as a result); however, if the taboo were to break down for whatever reason the species could disappear very rapidly.
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Management

Conservation Actions

Conservation Actions
This species is listed on Appendix I of CITES. It is known to occur in three national parks (Baie de Baly, Tsingy de Bemaraha, and Tsingy de Namoroka), the Tsingy de Bemaraha Strict Nature Reserve, and four special reserves (Ambohijanahary, Bemarivo, Kasijy, and Maningoza). Found as well in at least one classified forest (Tsiombokibo), which provides some degree of protection. There are no specimens reported in captivity (I.J. Porton pers. comm.).
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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. ^ Andriaholinirina, N., Baden, A., Blanco, M., Chikhi, L., Cooke, A., Davies, N., Dolch, R., Donati, G., Ganzhorn, J., Golden, C., Groeneveld, L.F., Irwin, M., Johnson, S., Kappeler, P., King, T., Lewis, R., Louis, E.E., Markolf, M., Mass, V., Mittermeier, R.A., Nichols, R., Patel, E., Rabarivola, C.J., Raharivololona, B., Rajaobelina, S., Rakotoarisoa, G., Rakotomanga, B., Rakotonanahary, J., Rakotondrainibe, H., Rakotondratsimba, G., Rakotondratsimba, M., Rakotonirina, L., Ralainasolo, F.B., Ralison, J., Ramahaleo, T., Ranaivoarisoa, J.F., Randrianahaleo, S.I., Randrianambinina, B., Randrianarimanana, L., Randrianasolo, H., Randriatahina, G., Rasamimananana, H., Rasolofoharivelo, T., Rasoloharijaona, S., Ratelolahy, F., Ratsimbazafy, J., Ratsimbazafy, N., Razafindraibe, H., Razafindramanana, J., Rowe, N., Salmona, J., Seiler, M., Volampeno, S., Wright, P., Youssouf, J., Zaonarivelo, J. & Zaramody, A. (2014). "Propithecus deckenii". IUCN Red List of Threatened Species. Version 2014.1. International Union for Conservation of Nature. Retrieved 2014-06-16. 
  3. ^ a b c d e Garbutt, Nick (2007). Mammals of Madagascar, A Complete Guide. pp. 196–197. 
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