Justification: Dypsis ambositrae has a quite large distribution range (the extent of occurrence is 1,790 km²) but it is considered to be Critically Endangered because of its low population density in each of the three known sites (only 40 mature individuals in total). None of these locations is protected while the size of the populations, especially those located along the main road, are declining seriously.
Endemic to the central Haut Plateau, around Ambositra in Madagascar. The species is currently known from three locations: Ilaka Afovoany, Amboditsirakena (Ambalamanakana) and Itremo mountains. Occurs from 1,500 up to 1,700 m.
The size of the population varies greatly between the known sites of occurrence. The population in the two sites along the National Road 7 (Ilaka Afovoany and Amboditsirakena) is estimated to be less than ten individuals and the mature trees of this species in Itremo are about 30, giving thus a total of approximately 40 mature individuals.
Grows in open mountain forest. Habitat seems to be related, topographically, to rocky areas and to weather characterized by a nearly permanent cloud cover and the frequency of drizzle and fog during the winter season.
Continuing decline in area, extent and/or quality of habitat:
The distribution range is in the area where human density is high in Madagascar. Consequently, the habitat is constantly threatened by wood exploitation or by expanding agriculture. The seeds of this species are collected for horticultural use.
Dransfield, J. and Beentje, H. 1995. The Palms of Madagascar. Royal Botanic Gardens Kew and The International Palm Society, Richmond.
IUCN. 2012. IUCN Red List of Threatened Species (ver. 2012.2). Available at: http://www.iucnredlist.org. (Accessed: 17 October 2012).
Rakotoarinivo, M. 2008. Analyse de la distribution et de la conservation des Palmiers (Arecaceae) de Madagascar par l'utilisation du systeme d'information geographique. Biologie et Ecologie Vegetale, University of Antananarivo.
Rakotoarinivo, M. & Dransfield, J. 2012. Dypsis ambositrae. The IUCN Red List of Threatened Species 2012: e.T38737A2883947. . Downloaded on 24 September 2017.
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