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 L. ssp. arsenariensis (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

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 18 June 2018.
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