Dypsis rivularis 


Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Liliopsida Arecales Palmae

Scientific Name: Dypsis rivularis
Species Authority: (Jum. & H.Perrier) Beentje & J.Dransf.
Chrysalidocarpus rivularis Jum. & H.Perrier

Assessment Information [top]

Red List Category & Criteria: Endangered B2ab(ii,iii,v); C2a(i); 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.
Known from seven localities between Daraina and Ankarafantsika in the northwest but the population is severely fragmented and the area of occupancy for this species is estimated to be only 457 km². Almost all of the known sites are not protected and are subject to clearance, reducing the quality and extent of the habitat and probably reducing the population which is now estimated as 100 mature individuals. Based on this information this species qualifies for listing as Endangered.
Previously published Red List assessments:
1998 Endangered (EN)
1998 Vulnerable (V)

Geographic Range [top]

Range Description: Endemic to northwest Madagascar where it occurs between Marovoay and Ambilobe.
Countries occurrence:
Estimated area of occupancy (AOO) - km2: 457
Number of Locations: 7
Lower elevation limit (metres): 100
Upper elevation limit (metres): 700
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: The total population is estimated to contain fewer than 100 individuals and is decreasing.
Current Population Trend: Decreasing
Additional data:
Number of mature individuals: 99 Continuing decline of mature individuals: Yes
Population severely fragmented: Yes
No. of subpopulations: 7
All individuals in one subpopulation: No

Habitat and Ecology [top]

Habitat and Ecology: Occurs in riverine forest. The species frequently grows on stream edges, among boulders at altitudes between 100 and 700 m.
Systems: Terrestrial
Continuing decline in area, extent and/or quality of habitat: Yes

Use and Trade [top]

Use and Trade: There is no information on use of this species.

Threats [top]

Major Threat(s): The main threat to this species is habitat loss through clearance for shifting agriculture and logging.

Conservation Actions [top]

Conservation Actions: Protected in Ankarafantsika and Manongarivo.

Citation: Rakotoarinivo, M. & Dransfield, J. 2012. Dypsis rivularis. The IUCN Red List of Threatened Species 2012: e.T38560A2879255. . Downloaded on 30 November 2015.
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