Nimba Range

Coordinates: 7°34′N 8°28′W / 7.567°N 8.467°W / 7.567; -8.467
Source: Wikipedia, the free encyclopedia.
(Redirected from
Nimba Massif
)
Nimba Range
Guinean montane forests near the Nimba range
Highest point
PeakMount Richard-Molard
Elevation1,752 m (5,748 ft)
Dimensions
Length40 km (25 mi)
Geography
LocationLiberia, Guinea, Côte d'Ivoire

The Nimba Range forms part of the southern extent of the Guinea Highlands. The highest peak is Mount Richard-Molard on the border of Côte d'Ivoire and Guinea, at 1,752 m (5,748 ft). "Mount Nimba" may refer either to Mount Richard-Molard or to the entire range. Other peaks include Grand Rochers at 1,694 m (5,558 ft), Mont Sempéré at 1,682 m (5,518 ft), Mont Piérré Richaud at 1,670 m (5,480 ft), Mont Tô at 1,675 m (5,495 ft), and Mont LeClerc 1,577 m (5,174 ft), all of them are located in Guinea.[1] Mount Nimba Strict Nature Reserve of Guinea and Côte d'Ivoire covers significant portions of the Nimba Range.

Geology

The Nimba Range is a narrow ridge extending approximately 40 km long, with an orientation of northeast–southwest. It is composed mostly of Precambrian rock, including granite and quartzite which contain deposits of iron ore.[2] Mining of top-quality iron-ore poses the major threat to the unique geomorphology and wildlife. There are about fifty springs, including the origins of the Cavally, Cestos, and Sassandra Rivers.

Climate

Rainfall varies greatly with elevation and season. About 3,000 mm of rain falls at the highest altitudes, and between 700 and 1,200 mm at the lower elevations. In fact, some parts of the mountain receive less precipitation, due to rain-shadow effect of the high ridge. Most of the rainfall occurs between May and October.[3]

Ecology

Sierra Leone prinia (Schistolais leontica) at Mount Nimba, Liberia.

The Nimba Range harbours an especially rich flora and fauna, and it is the home of more than 2000

West African lion (Panthera leo senegalensis), pygmy hippopotamus (Choeropsis liberiensis), zebra duiker (Cephalophus zebra), and western chimpanzee
(Pan troglodytes verus) that uses stones as tools.

Terrestrial ecoregions include

freshwater ecoregion with a high portion of endemic aquatic species.[4]

Terrestrial

The plant communities vary with altitude and cardinal orientation.

The

Morus mesozygia, and Terminalia ivorensis occur between 600 and 900 meters elevation.[2]

Below 600 meters, the montane forests transition to the Western Guinean lowland forests ecoregion.

The mountain is surrounded by

West Sudanian savanna
.

Freshwater

Swift-running streams descend steep slopes of the range, and often experience torrential floods during the rainy season. Rheophytes, plants that can live in running water, dominate the aquatic vegetation.

The endemic aquatic animals in the Nimba Range includes frogs, fish, the Nimba Stream Crab (Liberonautes nimba), and the endangered

dragonflies.[4]

The WWF designates the Nimba Range a distinct

freshwater ecoregion because of its moderate species richness and high proportion of endemic aquatic species, particularly among fish and amphibians. The Nimba Range's high elevation, its rapids and waterfalls that isolate habitat areas, and the stability of the aquatic environment, have promoted speciation
.

The

Guinean Highlands, of which the Nimba Range are part, separate the coastal rivers and streams of Upper Guinea from the upper Niger River basin. The highlands form a barrier to movement of aquatic species between these freshwater regions. The fish fauna of the Nimba Range shares affinities with that of Upper Guinea.[7]

Mount Nimba Strict Nature Reserve

In 1943, the colonial government established a Strict Nature Reserve in the Côte d'Ivoire section of the range. It was extended into Guinea the following year. The area remained protected after Guinea and Côte d'Ivoire became independent.

biosphere reserve in 1980, and a World Heritage Site
shortly thereafter.

References

  1. ^ "Grand Rochers, Guinea." Peakbaggers. Accessed 27 September 2015
  2. ^ a b c "Mount Nimba Strict Nature Reserve, Guinea and Côte d'Ivoire". Encyclopedia of Earth. Accessed November 10, 2012. [1]
  3. ^ "Mount Nimba". Freshwater Ecoregions of the World. Accessed November 10, 2012. [2]
  4. ^ a b "Freshwater Ecoregions Of the World". www.feow.org. Retrieved 2016-12-20.
  5. ^ "Arthroleptis crusculum" IUCN Red List. Accessed 28 September 2015
  6. ^ "Ptychadena submascareniensis". IUCN Red List. Accessed 28 September 2015. [3]
  7. ^ "Mount Nimba". Freshwater Ecoregions of the World, accessed November 10, 2012 [4]

External links

7°34′N 8°28′W / 7.567°N 8.467°W / 7.567; -8.467