Najas marina ssp. arsenariensis 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Liliopsida Hydrocharitales Hydrocharitaceae

Scientific Name: Najas marina ssp. arsenariensis
Species Authority: (Maire) L. Triest
Parent Species:
Najas arsenariensis Maire
Taxonomic Notes: Najas arsenariensis was originally described as a valid species. Triest (1987-1988) considered it as a subspecies, but this should be confirmed.

Assessment Information [top]

Red List Category & Criteria: Critically Endangered B1ab(iii)+2ab(iii) ver 3.1
Year Published: 2010
Date Assessed: 2009-02-01
Assessor(s): Rhazi, L., Grillas, P., Rhazi, M. & Flanagan, D.
Reviewer(s): Vela, E., de Bélair G. & Cuttelod, A. (IUCN Centre for Mediterranean Cooperation)
Najas marina ssp. arsenariensis is endemic to Algeria and is known from only one location. The extent of occurrence is less than 100 km² and the area of occupancy is less than 10 km². The populations are very small, isolated and fragmented. The quality of its habitat is declining due to anthopogenic pressures, in particular the presence of pollution due to the oil industry and human settlements. It is therefore considered as Critically Endangered.

Geographic Range [top]

Range Description:Najas marina ssp. arsenariensis is strictly endemic to Algeria. It is extremely rare, occurring at only one site along the Oranais coast line (Lake Melah near Arzeu). It has an extent of occurrence of less than 100 km2 and an area of occupancy of less than 10 km2.
Countries occurrence:
Additional data:
Estimated area of occupancy (AOO) - km2:1-10
Number of Locations:1
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:The populations are very small, isolated and fragmented. They are in slow decline due to the increase in anthropogenic pressure.
Current Population Trend:Decreasing
Additional data:
Population severely fragmented:Yes

Habitat and Ecology [top]

Habitat and Ecology:It is an annual plant (Therophyte) that inhabits lakes and salt marshes. Flowering occurs during spring and summer.

Threats [top]

Major Threat(s): Growing urbanization of the Oranais coast, water eutrophication, pollution due to the oil industry and the agricultural usage and drainage of its habitat are the main threats.

Conservation Actions [top]

Conservation Actions: There are no conservation measures in place, but the following actions are recommended:
- Monitor the existing sites and search for new sites
- Monitor the population dynamics
- Legal protection of the plant in Algeria (Algerian list of protected species)
- Reduce habitat loss by enforcing legal protection measures
- Education and creation of awareness
- Study its biology and ecology and estimate the population size
- Reduce agriculture and the use of fertilizers and herbicides around the sites
- Conservation in seed banks

Classifications [top]

5. Wetlands (inland) -> 5.14. Wetlands (inland) - Permanent Saline, Brackish or Alkaline Lakes
5. Wetlands (inland) -> 5.16. Wetlands (inland) - Permanent Saline, Brackish or Alkaline Marshes/Pools
12. Marine Intertidal -> 12.5. Marine Intertidal - Salt Marshes (Emergent Grasses)
1. Land/water protection -> 1.1. Site/area protection
2. Land/water management -> 2.1. Site/area management
3. Species management -> 3.4. Ex-situ conservation -> 3.4.2. Genome resource bank
4. Education & awareness -> 4.1. Formal education
4. Education & awareness -> 4.3. Awareness & communications
5. Law & policy -> 5.1. Legislation -> 5.1.2. National level
5. Law & policy -> 5.4. Compliance and enforcement -> 5.4.2. National level

In-Place Research, Monitoring and Planning
In-Place Land/Water Protection and Management
In-Place Species Management
In-Place Education
1. Residential & commercial development -> 1.1. Housing & urban areas
♦ timing:Ongoing    
→ Stresses
  • 1. Ecosystem stresses -> 1.1. Ecosystem conversion
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

2. Agriculture & aquaculture -> 2.1. Annual & perennial non-timber crops -> 2.1.2. Small-holder farming
♦ timing:Ongoing    
→ Stresses
  • 1. Ecosystem stresses -> 1.1. Ecosystem conversion
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

9. Pollution -> 9.2. Industrial & military effluents -> 9.2.1. Oil spills
♦ timing:Ongoing    
→ Stresses
  • 2. Species Stresses -> 2.1. Species mortality

9. Pollution -> 9.3. Agricultural & forestry effluents -> 9.3.4. Type Unknown/Unrecorded
♦ timing:Ongoing    
→ Stresses
  • 1. Ecosystem stresses -> 1.2. Ecosystem degradation

1. Research -> 1.2. Population size, distribution & trends
1. Research -> 1.3. Life history & ecology
3. Monitoring -> 3.1. Population trends
3. Monitoring -> 3.4. Habitat trends

Bibliography [top]

IUCN. 2010. IUCN Red List of Threatened Species (ver. 2010.2). Available at: (Accessed: 29 June 2010).

Maire, R. 1952. Flore de l'Afrique du nord. Lechevalier éd., Paris.

Quézel, P. and Santa, S. 1962. Nouvelle flore de l'Algérie et des régions désertiques méridionales. CNRS, Paris.

Triest, L. 1988. A revision of the genus Najas L. (Najadaceae) in the Old World. Classe des Sciences naturelles et medicales, Academie Royale des Sciences d'Outre-mer.

Citation: Rhazi, L., Grillas, P., Rhazi, M. & Flanagan, D. 2010. Najas marina ssp. arsenariensis. The IUCN Red List of Threatened Species 2010: e.T164538A5905739. . Downloaded on 27 April 2017.
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