Dypsis ambositrae 


Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Liliopsida Arecales Palmae

Scientific Name: Dypsis ambositrae
Species Authority: Beentje

Assessment Information [top]

Red List Category & Criteria: Critically Endangered D ver 3.1
Year Published: 2012
Date Assessed: 2010-12-17
Assessor(s): Rakotoarinivo, M. & Dransfield, J.
Reviewer(s): Baker, W.J., Beentje, H.J. & Bachman, S., Baker, W.J. & Beentje, H.J.
Dypsis ambositrae has a quite large distribution range (the extent of occurrence is 1,790 kmĀ²) 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.
Previously published Red List assessments:
1998 Critically Endangered (CR)
1998 Endangered (E)

Geographic Range [top]

Range Description: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.
Countries occurrence:
Estimated area of occupancy (AOO) - km2:147
Number of Locations:3
Lower elevation limit (metres):1500
Upper elevation limit (metres):1700
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population: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.
Current Population Trend:Decreasing
Additional data:
Number of mature individuals:40Continuing decline of mature individuals:Yes
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology: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:Yes

Use and Trade [top]

Use and Trade: Seed is collected for sale to the international horticultural trade.

Threats [top]

Major Threat(s): 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.

Conservation Actions [top]

Conservation Actions: At present, none of the known occurrence sites are protected. The status of Itremo as a new protected area is still uncertain.

Classifications [top]

1. Forest -> 1.9. Forest - Subtropical/Tropical Moist Montane
suitability: Suitable  major importance:Yes
0. Root -> 6. Rocky areas (eg. inland cliffs, mountain peaks)
suitability: Unknown  
2. Land/water management -> 2.1. Site/area management
3. Species management -> 3.1. Species management -> 3.1.1. Harvest management
3. Species management -> 3.1. Species management -> 3.1.2. Trade management
3. Species management -> 3.3. Species re-introduction -> 3.3.1. Reintroduction
4. Education & awareness -> 4.1. Formal education
4. Education & awareness -> 4.3. Awareness & communications

In-Place Research, Monitoring and Planning
  Action Recovery plan:Yes
In-Place Land/Water Protection and Management
  Conservation sites identified:Yes, over part of range
  Occur in at least one PA:Yes
  Percentage of population protected by PAs (0-100):61-70
In-Place Species Management
  Subject to ex-situ conservation:Yes
In-Place Education
2. Agriculture & aquaculture -> 2.1. Annual & perennial non-timber crops -> 2.1.1. Shifting agriculture
♦ timing: Ongoing ♦ scope: Majority (50-90%) ♦ severity: Rapid Declines ⇒ Impact score: Medium Impact: 7 
→ Stresses
  • 1. Ecosystem stresses -> 1.1. Ecosystem conversion
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation
  • 2. Species Stresses -> 2.1. Species mortality

5. Biological resource use -> 5.2. Gathering terrestrial plants -> 5.2.1. Intentional use (species is the target)
♦ timing: Ongoing ♦ scope: Majority (50-90%) ♦ severity: Causing/Could cause fluctuations ⇒ Impact score: Medium Impact: 6 
→ Stresses
  • 2. Species Stresses -> 2.3. Indirect species effects -> 2.3.8. Other

5. Biological resource use -> 5.3. Logging & wood harvesting -> 5.3.3. Unintentional effects: (subsistence/small scale)
♦ timing: Ongoing ♦ scope: Majority (50-90%) ♦ severity: Rapid Declines ⇒ Impact score: Medium Impact: 7 
→ Stresses
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation
  • 2. Species Stresses -> 2.1. Species mortality

1. Research -> 1.2. Population size, distribution & trends

♦  Pets/display animals, horticulture
 National : ✓ 

Bibliography [top]

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.

Citation: Rakotoarinivo, M. & Dransfield, J. 2012. Dypsis ambositrae. In: The IUCN Red List of Threatened Species 2012: e.T38737A2883947. . Downloaded on 26 November 2015.
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