Propithecus deckenii

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA CHORDATA MAMMALIA PRIMATES INDRIIDAE

Scientific Name: Propithecus deckenii
Species Authority: A. Grandidier, 1867
Common Name(s):
English Van der Decken’s Sifaka, Decken's Sifaka
Synonym(s):
Propithecus verreauxi subspecies deckenii A. Grandidier, 1867
Taxonomic Notes: Formerly included as a subspecies of P. verreauxi (e.g., see Groves 1993), but now considered distinct. Taxonomic field study is needed, especially at the Bongolava Massif, as it is unclear whether this species or P. coronatus is present there (Petter and Peyriras 1972).

Assessment Information [top]

Red List Category & Criteria: Endangered A2cd+3cd+4cd ver 3.1
Year Published: 2014
Date Assessed: 2012-07-11
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.
Facilitator/Compiler(s): Chiozza, F. & Clark, F.
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)

Geographic Range [top]

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). 
Countries:
Native:
Madagascar
Range Map:Click here to open the map viewer and explore range.

Population [top]

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

Habitat and Ecology [top]

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

Use and Trade [top]

Use and Trade: Hunting is a threat, although 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.

Threats [top]

Major Threat(s): 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.

Conservation Actions [top]

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.).

Bibliography [top]

Groves, C. P. 1993. Primates. In: D. E. Wilson and D. A. Reeder (eds), Mammal Species of The World, Smithsonian Institution Press, Washington, DC, USA.

IUCN. 2014. IUCN Red List of Threatened Species (ver. 2014.1). Available at: www.iucnredlist.org. (Accessed: 14 May 2014).

Petter, J.J., and Peyrieras A. 1972. Melanization in the genus Propithecus Malagasey Lemur. Journal of Human Evolutoon 1: 379-388.

Thalmann, U., Kümmerli, R. and Zaramody, A. 2002. Why Propithecus verreauxi deckeni and P. v. coronatus are valid taxa – quantitative and qualitative arguments. Lemur News 7: 11 – 16.


Citation: 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. In: The IUCN Red List of Threatened Species. Version 2014.1. <www.iucnredlist.org>. Downloaded on 22 July 2014.
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