Overview

Distribution

Range Description

Following the recent study of Rabarivola et al. (2007), this species is known from the Ankarana and Analamerana region in the north of Madagascar (although see Banks et al. 2007 who did not record it there), and throughout the Sambirano region in the north-west (and the Ampasandava Peninsula). Rabarivola et al. (2007) also found evidence that the range of this species extends further south in the eastern rainforests than previously believed, occurring in Maraonsetra in the north-east at least to Zahamena, east of Lake Aloatra. Whether these populations are contiguous remains to be determined. Animals from the central-western parts of Madagascar, formerly attributed to H. occidentalis, are now provisionally assigned to H. griseus following Rabarivola et al. (2007).
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
Little is known about this species. Apparently, it has a preference for forests that contain bamboo or bamboo vines, but it also has been reported from degraded habitats in the Sambirano River valley, as well as in patches of bamboo surrounded by agricultural land (Mittermeier et al. 2008, and references therein). It is reported as being active mainly at night, with groups of six individuals recorded (Mutschler and Tan 2003).

Systems
  • Terrestrial
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
VU
Vulnerable

Red List Criteria
A2cd

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 27 years (assuming a generation length of 9 years) due primarily to a decline in area and quality of habitat within the known range of the species and levels of exploitation due to hunting.

History
  • 2000
    Vulnerable
  • 1996
    Vulnerable
  • 1994
    Vulnerable
    (Groombridge 1994)
  • 1990
    Vulnerable
    (IUCN 1990)
  • 1990
    Vulnerable
    (IUCN 1990)
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Population

Population
A single group of H. occidentalis was observed during a visit to Ambery, a secondary forest site supporting patches of giant bamboo (Valiha sp.) in the north of Madagascar. The encounter rate was 0.06 groups per km, a useful step towards assessing the population status of this species, because there have been few studies where the local population levels of this species have been estimated from survey methods (Banks et al. 2007).

Population Trend
Decreasing
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Threats

Major Threats
This species is threatened mainly by the regular burning of its habitat to clear pasture for livestock; charcoal production in the west and mining in Ankarana are also leading to degradation of habitat. Hunting is also a major threat; in Makira, hunting takes place using slingshots, machetes, and firearms (Golden 2005).
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Management

Conservation Actions

Conservation Actions
This species is listed on Appendix I of CITES. It occurs in four national parks (Masoala, Mananara-Nord, Marojejy, and Zahamena), three strict nature reserves (Tsaratanana, Betampona and Zahamena), and six special reserves (Manongarivo, Analemarana, Ankarana, Anjanaharibé-Sud, Ambatovaky, Marotandrano). However, recent surveys did not encounter any animals in Analamerana or Ankarana, just in a single patch of unprotected forest in the corridor that connects these reserves (Banks et al. 2007).
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Wikipedia

Western lesser bamboo lemur

The western lesser bamboo lemur (Hapalemur occidentalis), also known as the northern bamboo lemur or western gentle lemur, is species of bamboo lemur endemic to Madagascar. The total length of this primate is 55–67 cm, more than half of which is tail, and average weight is just under 1 kg.[3] It lives in several discontinuous areas in northern and western Madagascar, including Ankarana[4] and Analamerana in the north, Sambirano and the Ampasindava Peninsula in the northwest, and various areas in the west between the Mahavany and Tsiribihina Rivers.[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. pp. 116–117. 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., Hapke, A., 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). "Hapalemur occidentalis". IUCN Red List of Threatened Species. Version 2014.1. International Union for Conservation of Nature. Retrieved 2014-06-16. 
  3. ^ a b Mittermeier, Russell, et al. (2006). Lemurs of Madagascar, Second Edition. p. 220. 
  4. ^ Wilson, Jane (1995). Lemurs of the Lost World: exploring the forests and Crocodile Caves of Madagascar. Impact, London. p. 216. ISBN 978-1-874687-48-1. 
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