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Rumpi Hills

Coordinates: 4°50′N 9°07′E / 4.833°N 9.117°E / 4.833; 9.117
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Rumpi Hills
Rumpi Hills is located in Cameroon
Rumpi Hills
Rumpi Hills
Location in Cameroon
Highest point
Elevation1,800 m (5,900 ft)
Coordinates4°50′N 9°07′E / 4.833°N 9.117°E / 4.833; 9.117
Geography
LocationCameroon
Parent rangeCameroon line

The Rumpi Hills are an undulating mountain range with its highest peak, Mount Rata about 1,800 m (5,900 ft) located between the villages of Dikome Balue and Mofako Balue, Ndian division in the Southwest region of Cameroon.[1][2] The hills are situated at 4°50’N 9°07’E, cutting across four local councils, with the eastern slopes in Dikome Balue, southern slopes in Ekondo Titi, western slopes in Mundemba, and northern slopes in Toko local councils respectively. These hills are located about 80 km (50 mi) north of Mount Cameroon; about 50 km (31 mi) west of the Bakossi Mountains and some 15 km (9.3 mi) southeast of the Korup National Park.[3][4]

The Rumpi hills are covered by more than 2,300 km2 (890 sq mi) of a combination of mid-altitude, coastal evergreen and drier northern semi-evergreen forests as well as other vegetation types. About 455 km2 (176 sq mi) of this forest forms what is known as the Rumpi Hills Forest Reserve (RHFR). Located in the equatorial forest zone of Cameroon, this area is very rich in plant biodiversity ranging from fungi to angiosperms.[5][3]

Notwithstanding this plant biodiversity, variations do occur in the distribution of the forest ecosystems in this area. This variation in the distribution of forest ecosystems, is due to the changing agricultural landscape especially along the southern slopes of these hills.[1][6] Apart from oil palm (Elaeis guineensis) owned by the agro-industrial company, Pamol Plantations PLC, and sprouting smallholder plantations, other dominant tree species do exist. These include species such as

Other species include

as well as non-timber forest species such as

Additionally, many tropical montane mammal, bird, reptile and amphibian species such as

are present.[8][9]

Rata Mountain (Peak of Rumpi Hills) as seen from Mofako Balue, Ndian division of Cameroon.

Classification of the Rumpi Hills Forests

The forests of the Rumpi hills form part of the Cross-Sanaga-Bioko coastal forests which are a tropical humid broadleaf forest ecoregion of west–central Africa. The ecoregion includes the lowland and coastal forests of southeastern Nigeria, southwestern Cameroon and the lowlands of Bioko island, covering an estimated 52,200 km2 (20,200 sq mi). The forests cut across Nigeria's Cross River to Cameroon's River Sanaga in the southeast and about 300 km (190 mi) from the edges of the Atlantic Ocean coast.[10][11][2]

White (1983) carried-out a phytogeographic vegetation classification of this lowland forests ecoregion. These lowland forests are situated in the Lower Guinea zone of the Guineo-Congolian region of rich and endemic biodiversity composed of animal and plant species. These are mainly hygrophilous coastal evergreen rain forests which may contain other mixed moist semi-evergreen rain forests according to elevation gradient.[10] In these forests, some trees may reach 50 m (160 ft) tall usually in different vegetation levels (multi-storey canopy levels). Most common plant families (with regards to species density and distribution) are Annonaceae, Leguminosae, Euphorbiaceae and Rubiaceae.

Despite having mixed vegetation, these forests have Caesalpinioid plants as the dominant vegetation particularly along elevation gradients 400 to 1,800 m (1,300 to 5,900 ft) elevation). Most often, the vegetation structure becomes sparse above 1,800 m (5,900 ft) elevation containing mainly montane bamboo forests, shrubs and grasslands. Afromontane plant species such as Prunus Africana and Nuxia congesta are dominant.[11][5][12][1][4]

Mount Fako and the island of Bioko are located above 900 m (3,000 ft) and in a separate ecoregion consisting of the Mount Fako and Bioko Island montane forests. These montane forests extend inland to other highland forests of Cameroon and towards the Cross–Niger forests transition ecoregion to the west. Moving further inland to the north, east and south, these coastal forests mosaic to the Guinean forest–savannah, the Congolian forest–savannah and the Atlantic equatorial coastal forests (mainly along the River Sanaga).

It rains heavily throughout the year giving a wet climate especially with many rivers including the Cross River, River Sanaga, River Mungo, River Ndian, River Wouri and River Niger that run across the landscape.[1][2] Aside rivers, the region is also home to a number of small circular craters, produced by volcanic explosions which have subsequently formed crater lakes, including Lake Barombi Mbo, Dissoni/Soden, Barombi Kotto, Benakuma, Nyos and Monoun. The ancient nature and isolation has led to a high level of endemism in these lakes where over 75% of the fish species and approximately one-third of the aquatic insects are endemic.[13][14] For instance, Lake Dissoni/Soden, a small volcanic lake covering an estimated 1.25 km2 (0.48 sq mi), is located at the southeastern slopes of the Rumpi hills. The lake flows into a stream that eventually empties into the River Meme.[15][13] There are only three fish species in the lake which are all endemic including Poeciliid (Procatopus lacustris) which may be related to Procatopus similis more abundant in surrounding rivers, streams and lakes. An undescribed catfish (Clarias spp) and barb (Barbus spp) as well as the atyid shrimp Caridina sodenensis are endemic species to this lake.[15][16]

Majority of the region is located on the African Precambrian shield which contains principally basement rocks. Over the years, the weathering of these basement rocks has created dense layers of leached and poor red earth soils. Meanwhile, along the Atlantic Equatorial coastal forests, the continuous deposition of sand, rocks and silt has created extensive muddy banks, mangrove swamps and sandy beaches. Mount Fako and Bioko are active volcanoes and therefore their surrounding soils are rich which are from volcanic ash and pyroclastic lava and ash.[17][18]

References

  1. ^ a b c d e Etongo & Glover 2012.
  2. ^ a b c Mukete et al. 2018b.
  3. ^ a b Birdlife International 2014.
  4. ^ a b Mukete et al. 2018c.
  5. ^ a b Moyersoen, Becker & Alexander 2001.
  6. ^ Greenpeace Africa 2012.
  7. ^ Mukete 2014.
  8. ^ Tchigio 2007.
  9. ^ Linder 2013.
  10. ^ a b White 1983.
  11. ^ a b Cheek et al. 1996.
  12. ^ Chuyong et al. 2011.
  13. ^ a b FEOW 2008.
  14. ^ WWF 2015.
  15. ^ a b Trewavas 1962.
  16. ^ Richard & Clark 2009.
  17. ^ Yerima & Van Ranst 2005.
  18. ^ Mukete 2018.

Sources

  1. Agricultural systems and food security in Toko, Mundemba and Nguti, in South West Cameroon. A research report by ACDIC (PDF). Greenpeace Africa. 2012. Archived (PDF) from the original on 12 February 2019. {{cite book}}: |archive-date= / |archive-url= timestamp mismatch; 13 February 2019 suggested (help); Invalid |ref=harv (help)
  2. "Cameroon Crater Lakes". WWF. 2015. Retrieved 20 September 2017. {{cite web}}: Invalid |ref=harv (help)
  3. Cheek, M; Cable, S; Hepper, F N; Ndam, N; Watts, J (1996). van der Masen, G; van der Burgt, X; van Medenbach de Rooy, J (eds.). Mapping plant biodiversity on Mount Cameroon. The biodiversity of African plants. Proceedings XIVth AETFAT Congress (1994). Wageningen, Netherlands: Kluwer Academic Press, Dordrecht. pp. 110–120. doi:10.1007/978-94-009-0285-5_16. {{cite conference}}: Invalid |ref=harv (help)
  4. Chuyong, G; Kenfack, D; Harms, K; Thomas, W; Condit, R; Comita, L (2011). "Habitat specificity and diversity of tree species in an African wet tropical forest" (PDF). Plant Ecology. 212 (8): 1363–1374. doi:10.1007/s11258-011-9912-4. {{cite journal}}: Invalid |ref=harv (help)
  5. Etongo, Daniel B; Glover, Edinam K (2012). "Participatory resource mapping for livelihood values derived from the forest in Ekondo-Titi subregion, Cameroon: A gender analysis". International Journal of Forestry Research. 2012 (ArticleID 971068): 9. doi:10.1155/2012/871068. {{cite journal}}: Invalid |ref=harv (help)
  6. Linder, Joshua M (2013). "African primate diversity threatened by "new wave" of industrial oil palm expansion" (PDF). African Primates. 8: 25–38. Archived (PDF) from the original on 18 February 2018. {{cite journal}}: |archive-date= / |archive-url= timestamp mismatch; 18 February 2019 suggested (help); Invalid |ref=harv (help)
  7. "Mount Rata and Rumpi Hills Forest Reserve". BirdLife International. Retrieved 18 February 2019. {{cite web}}: Invalid |ref=harv (help)
  8. Moyersoen, B; Becker, I; Alexander, J (2001). "Are ectomycorrhizas more abundant than arbuscular mycorrhizas in tropical heath forests?". New Phytologist. 150 (3): 591–599. doi:10.1046/j.1469-8137.2001.00125.x. {{cite journal}}: Invalid |ref=harv (help)
  9. Mukete, B (2014). "Why is food so scarce? An Analysis of the Ndian food security crisis". Retrieved 17 September 2016. {{cite web}}: Invalid |ref=harv (help)
  10. Mukete, B; Sun, Y; Etongo, D; Sajjad, S; Abdul, M (2018b). "Assessing the drivers of land use change in the Rumpi hills forest protected area, Cameroon". Journal of Sustainable Forestry. 37 (6): 592–618. doi:10.1080/10549811.2018.1449121. {{cite journal}}: Invalid |ref=harv (help)
  11. Mukete, B; Sun, Y; Etongo, D; Ekoungoulou, R; Folega, F; Sajjad, S; Ngoe, M; Ndiaye, G (2018c). "Household characteristics and forest resources dependence in the Rumpi hills of Cameroon". Applied Ecology and Environmental Research. 16 (3): 2755–2779. doi:10.15666/aeer/1603_27552779. {{cite journal}}: Invalid |ref=harv (help)
  12. Mukete, Beckline (2018d). A Study on Land Use and Land Cover Changes in the Rumpi Hills Forests of Cameroon (PhD thesis). Department of Forest Management, Beijing Forestry University, China. {{cite thesis}}: Invalid |ref=harv (help)
  13. Mamonekene, Victor (2008). "Freshwater Ecoregions of the World – 518: Northern Gulf of Guinea Drainages - Bioko". Institut de Développement Rural, Université Marien Ngouabi-Brazzaville, Brazzaville, Congo: FEOW. Archived from the original on 27 October 2017. {{cite web}}: Invalid |ref=harv (help)
  14. Richard, Jasmine; Clark, Paul F (1995). "African caridina (Crustacea: Decapoda: Caridea: Atyidae): redescriptions of C. africana Kingsley, 1882, C. togoensis Hilgendorf, 1893, C. natalensis Bouvier, 1925 and C. roubaudi Bouvier, 1925 with descriptions of 14 new species". Zootaxa: 1–75. ISBN 978-1869773205. {{cite journal}}: Invalid |ref=harv (help)
  15. Tchigio, Innocent (2007). Opportunities for community-based wildlife management : a case study from the Korup region, Cameroon. Cuvillier, Gottingen. p. 190. ISBN 978-3867272391. {{cite book}}: Invalid |ref=harv (help)
  16. Trewavas, Ethelwynn (1962). "Fishes of the Crater Lakes of the Northwestern Cameroons" (PDF). 13. Bonner Zoologische Beitraege: 146–190. Archived (PDF) from the original on 28 February 2019. {{cite journal}}: |archive-date= / |archive-url= timestamp mismatch; 18 February 2019 suggested (help); Cite journal requires |journal= (help); Invalid |ref=harv (help)
  17. White, Frank (1983). Vegetation of Africa: a descriptive memoir to accompany the Unesco/AETFAT/UNSO vegetation map of Africa. Natural Resources Research. Vol. 20. Paris: UNESCO. ISBN 978-9231019555. {{cite book}}: Invalid |ref=harv (help)
  18. Woolley, Alan Robert (2001). Alkaline rocks and carbonatites of the world, Part 3. Geological Society. p. 37. ISBN 978-1862390836. {{cite book}}: Invalid |ref=harv (help)
  19. Yerima, Bernard Palmer Kfuban; Van Ranst, Eric (2005). Major Soil Classification Systems Used in the Tropics: Soils of Cameroon. Trafford Publishing. p. 144. ISBN 978-1412058537. {{cite book}}: Invalid |ref=harv (help)
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