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Hapalemur griseus ssp. griseus

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA CHORDATA MAMMALIA PRIMATES LEMURIDAE

Scientific Name: Hapalemur griseus ssp. griseus
Species Authority: (Link, 1795)
Parent Species:
Common Name(s):
English Grey Lesser Bamboo Lemur, Grey Gentle Lemur, Eastern Lesser Bamboo Lemur

Assessment Information [top]

Red List Category & Criteria: Vulnerable A2cd+3cd+4cd; B1ab(i,iii) 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., 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.
Reviewer(s): Schwitzer, C. & Molur, S.
Facilitator/Compiler(s): Chiozza, F.
Justification:

Listed as Vulnerable as this subspecies is suspected to have undergone a population decline of ≥30% over a period of 24 years (three generations), due primarily to continuing decline in area, extent and quality of habitat, and exploitation through unsustainable levels of hunting. These causes have not ceased, and will to a large extent not be easily reversible. A population reduction of ≥30% is also suspected to be met in the future (over a period of three generations) due to the same causes. Its extent of occurrence (EOO) is also less than 20,000 km2 and the population is severely fragmented.

History:
1994 Insufficiently Known (Groombridge 1994)
1990 Insufficiently Known (IUCN 1990)
1990 Insufficiently Known (IUCN 1990)

Geographic Range [top]

Range Description: Before recent taxonomic splitting of what was thought to be the most widespread of the Bamboo Lemurs, the presumed range of Hapalemur griseus extended through all remaining tropical moist lowland and montane forests in eastern Madagascar, from the latitude of Lake Alaotra in the north to Ranomafana in the south, wherever bamboo is present (Rabarivola et al., 2007). However, the geographic distributions of the different forms that make up this genus have recently been revised by Rabarivola et al. (2007). According to these authors the nominate form, H. g. griseus, is now restricted to central-eastern Madagascar, roughly from the Onibe River south to the Onive River (which separates it from Hapalemur griseus gilberti).
Countries:
Native:
Madagascar
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: Population numbers are in decline due to habitat loss and hunting.
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: This species occurs in various types of eastern forest, but is found at its highest densities near stands of bamboo and bamboo vines. Bamboo constitutes at least three-quarters of the diet, primarily new shoots and leaf. Group size varies between two and seven, and groups can contain more than one breeding female. Reports of home range size vary from 6-10 ha at Analamazaotra to as much as 15-20 ha at Ranomafana. The birth season for this species is essentially October through January, and a single young is the rule; the inter-birth interval is typically one year (Mittermeier et al. 2008, and references therein).
Systems: Terrestrial

Use and Trade [top]

Use and Trade: This species is hunted and it is also commonly kept as a pet.

Threats [top]

Major Threat(s): Hunting is a major threat to this species, and it also commonly kept as a pet. Habitat loss, due to slash-and-burn practices and due to clearing of bamboo stands, is also a threat.

Conservation Actions [top]

Conservation Actions: This species is listed on Appendix I of CITES. Since the geographic distributions of the different forms that make up this genus have been revised resulting in a much-reduced range for this species, H. g. griseus is now known to occur in only two special reserves (Analamazaotra and Mangerivola), as well as in Mantadia National Park and the Betampona Strict Nature Reserve.

Citation: 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 griseus ssp. griseus. The IUCN Red List of Threatened Species. Version 2014.2. <www.iucnredlist.org>. Downloaded on 17 September 2014.
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