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Population status of the Alaotran gentle lemur Hapalemur griseus alaotrensis

  • Thomas Mutschler (a1), A. Jeannicq Randrianarisoa (a1) and Anna T. C. Feistner
  • DOI: http://dx.doi.org/10.1046/j.1365-3008.2001.00167.x
  • Published online: 01 April 2009
Abstract
Abstract

The results of a field census of Alaotran gentle lemurs Hapalemur griseus alaotrensis carried out in February and March 1999 are reported. The results are compared with a census carried out 5 years earlier in 1994. Both censuses followed the same methods and were carried out by the same team, using direct observation from canoe. Mean group encounter rates for the lemur were assessed in each location, which allowed us to calculate the relative group density in each site. Qualitative information on habitat condition (on the basis of plant diversity, vegetation height and evidence of burning) was gathered at each site. Additional information, mainly on lemur hunting, was acquired through interviews with local people. In most sites group encounter rate was at least 50 per cent lower than 5 years before. Taking into account unusually low water levels because of a drought at Lac Alaotra in 1999, we estimate that these encounter rates reflect a 30 per cent decline in the total population size over the last 5 years. The main cause of this dramatic decrease was humaninduced fire (habitat degradation) coupled with heavy hunting (poaching of lemurs for food). The importance of assessing regularly both population status and threats, and of adjusting conservation actions accordingly is emphasized.

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Corresponding author
Durrell Wildlife Conservation Trust, Les Augrès Manor, Trinity, Jersey JE3 5BP, Channel Islands, British Isles. E-mail: afeistner@durrell.org
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This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

J. Durbin (1999) Lemurs as flagships for conservation in Madagascar. In New Directions in Lemur Studies (eds B. Rakotosamimanana , H. Rasamimanana , J. U. Ganzhorn and S. M. Goodman ), pp. 269281. Plenum Press, New York.

A.T.C. Feistner (1999) Conservation of the Alaotran gentle lemur: a multidisciplinary approach. In New Directions in Lemur Studies (eds B. Rakotosamimanana , H. Rasamimanana , J. U. Ganzhorn and S. M. Goodman ), pp. 241248. Plenum Press, New York.

T. Mutschler (1999b) Folivory in a small-bodied lemur: the nutrition of the Alaotran gentle lemur (Hapalemur griseus alaotrensis). In New Directions in Lemur Studies (eds B. Rakotosamimanana , H. Rasamimanana , J. U. Ganzhorn and S. M. Goodman ), pp. 221239. Plenum Press, New York.

T. Mutschler , C.M. Nievergelt & A.T.C. Feistner (2000) The social organization of the Alaotran gentle lemur (Hapalemur griseus alaotrensis). American journal of Primatology, 50, 924.

C. Nievergelt , T. Mutschler & A.T.C. Feistner (1998) Group encounters and territoriality in wild Alaotran gentle lemurs (Hapalemur griseus alaotrensis). American Journal of Primatology, 46, 251258.

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Oryx
  • ISSN: 0030-6053
  • EISSN: 1365-3008
  • URL: /core/journals/oryx
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