Map_thumbnail_large_font

Microcebus ravelobensis

Status_ne_offStatus_dd_offStatus_lc_offStatus_nt_offStatus_vu_offStatus_en_onStatus_cr_offStatus_ew_offStatus_ex_off

Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA CHORDATA MAMMALIA PRIMATES CHEIROGALEIDAE

Scientific Name: Microcebus ravelobensis
Species Authority: Zimmermann, Cepok, Rakotoarison, Zietemann & Radespiel, 1998
Common Name(s):
English Golden-brown Mouse Lemur

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(i,iii) ver 3.1
Year Published: 2014
Date Assessed: 2012-07-11
Assessor(s): 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.
Facilitator/Compiler(s): Chiozza, F. & Clark, F.
Justification:
The distribution range of M. ravelobensis is 3,340 km2, and the minimum convex polygon value of the range is 9,486 km2. This extent of occurrence (EOO) is severely fragmented and is undergoing continuing decline in area, extent and quality of habitat. This spread of plausible values for EOO qualifies the taxon for two categories: Endangered and Vulnerable. The precautionary principle would recommend the taxon be listed under the higher (more threatened) category. Based on these premises, the species is listed as Endangered.
History:
2000 Endangered

Geographic Range [top]

Range Description: This species is endemic to the island of Madagascar. The type specimen for this species was collected adjacent to Lac Ravelobe, from which its scientific name is derived. Based on morphological measurements, Zimmermann et al. (1997, 1998) concluded that two species of mouse lemur inhabited the forests of Ankarafantsika in north-western Madagascar, where M. ravelobensis is now known to occur sympatrically with M. murinus. It is also known from the Bongolava Classified Forest and Mariarano Classified Forest (Mittermeier et al. 2008). It occurs from sea-level to 500 m.
Countries:
Native:
Madagascar
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: Almost all sampled populations of M. ravelobensis show genetic evidence for a relatively rapid crash in population size of about two orders of magnitude. This crash is likely to have occurred within the last 500 years, thus coinciding with accelerated deforestation due to human population expansion in Madagascar. In Ankarafantsika, population density is estimated to be at 700 individuals/km(Mittermeier et al. 2008 and references therein).
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: This species inhabits dry deciduous lowland forest up to 500 m and can be observed even in degraded patches. It appears to prefer forests with a lower canopy height and more lianas than those inhabited by M. murinus, and also uses tree holes less often than that of other species. This species feeds on gum, insect excretions, nectar, fruits, leaves, and animal matter (Mittermeier et al. 2008 and references therein). 


Systems: Terrestrial

Threats [top]

Major Threat(s): The major threat is habitat loss due to slash-and-burn agriculture and seasonal bushfires. The species also may be susceptible to predation from feral carnivores and invasive non-endemic carnivores.

Conservation Actions [top]

Conservation Actions: This species is listed on Appendix I of CITES. Ankarafantsika National Park is the only protected area in which it is confirmed to occur, but it has also been reported from Mariarano Classified Forest, which offers some degree of protection. Almost all sampled populations of M. ravelobensis, along with those of the other north-western Microcebus species M. danfossi and M. bongolavensis, show genetic evidence for a relatively rapid crash in population size of about two orders of magnitude. This crash is likely to have occurred within the last 500 years, thus coinciding with accelerated deforestation due to human population expansion in Madagascar. No specimens are reported in captivity at this time (ISIS 2009). Additional survey work is needed to determine the full extent of the species' range. Serious consideration should be given to establishing a protected area that includes the Mariarano Classified Forest.



Citation: 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. Microcebus ravelobensis. The IUCN Red List of Threatened Species. Version 2014.2. <www.iucnredlist.org>. Downloaded on 01 September 2014.
Disclaimer: To make use of this information, please check the <Terms of Use>.
Feedback: If you see any errors or have any questions or suggestions on what is shown on this page, please fill in the feedback form so that we can correct or extend the information provided