Usambara Mountains

Western Usambara

Government Hotel

The Usambara Mountains are a mountain range of northeastern Tanzania, within the Lushoto District of the Tanga Region, in tropical eastern Africa. The range is approximately 90 kilometres (56 mi) long and about half that wide. The rock is of Precambrian metamorphic origin, and the mountains were formed nearly two million years ago by faulting and uplifting. They are split into two sub-ranges; the West Usambaras are higher and the East Usambara are closer to the coast and receive more rainfall.

The mountains are clad in virgin tropical rainforest which has been isolated for a long period and they are a centre of endemism. Historically they were inhabited by Bantu, Shambaa, and Maasai people but in the eighteenth century, a Shambaa kingdom was founded by Mbegha. The kingdom eventually fell apart after a succession struggle in 1862. German colonists settled in the area which was to become German East Africa, and after World War I it became part of the British mandated territory of Tanganyika.

Geography

The Usambaras are approximately 90 kilometres (56 mi) long and ranging from 30–50 kilometres (19–31 mi) in width. They are part of the Eastern Arc Mountains, which stretch from Kenya through Tanzania. The range is one of the world’s Biodiversity hotspots.

The range is accessible from the towns of Lushoto in the west, and Amani in the east. The Usambaras are commonly split into two sub-ranges, the West Usambara Mountains and the East Usambara Mountains. The East Usambara are closer to the coast, receive more rainfall, and are significantly smaller than the West Usambara.

Geology

The mountain range was formed nearly two billion years ago. Due to a lack of glaciations and a relatively consistent climate, the rainforest has gone through a long term and unique evolution resulting in an impressive amount of endemism and an old growth cloud rainforests. ^[1]

The West and East Usambaras are large ranges of Precambrian metamorphic geologic formations of acid-gneisses, pyroxenes, and amphiboles. These mountains were formed by faulting and uplifting creating the drainage system of troughs that form many watersheds, which provide water to a majority of the population of northeast Tanzania.^[2]

Ecology

The Usambara Mountains are fairly unusual in East Africa with their natural regions still covered in tropical forests, which otherwise continentally remain primarily in Western Africa. Considered tremendously significant ecologically and a Biodiversity hotspot. There are many protected zones throughout the range, which are being expanded and contributed to by the Tanzanian government, associated NGO's and research teams, and donor countries such as Norway.

Several species are endemic to the Usambara forests, including the Usambara eagle-owl (Bubo vosseleri), the Usambara akalat (Sheppardia montana), the Usambara weaver (Ploceus nicolli), the African violet (Saintpaulia ionantha), the tree species Calodendrum eickii.

Human history

Historically the Usambara Mountains have been inhabited by the Bantu, Shambaa, and Maasai people who were a mix of agriculturalists and pastoralists.

A Shambaa kingdom based on Vugu was founded by Mbegha in the first half of the 18th century. ^[3] His grandson Kinyashi Muanga Ike gave the kingdom a stronger political and military structure.^[4] Under Kinyashi's son Kimweri ye Nyumbai the kingdom grew to cover both the west and east Usambaras, extending down to the coast and into the Pangani River valley to the south. ^[3] After Kimweri died in 1862 the kingdom fell apart in a succession struggle. ^{[5] [6]}

In the late 19th century when within the Usambara District of German East Africa, German colonialists came into the area bringing with them a mix of cash crops like lumber trees, coffee, tea, and quinine, and also designated forests as reserves for either water conservation or timber use.^[7] They also brought many new Western concepts, which often were diametrically opposed to traditional beliefs, such as coexistence with the forest versus forest as a "separate wilderness".^[8] The result of colonialism was a massive change in the way forests were perceived in the community, and conversion of traditional agriculture to cultivating cash crops such as quinine, pine trees, bananas, maize, tea, and coffee.

In 1882 Adalbert Emil Walter Redliffe le Tanneux von St. Paul-Ilaire (known as Baron Walter), the Governor of the Usambara District of German East Africa, collected seed and plants of a small herb which were sent to Hermann Wendland, Director of the Berlin Royal Botanic Garden. Wendland cultivated the plants and recognized them as representing a new species in a new genus, Saintpaulia ionantha, with the English common name African violet. In the generic name. Saintpaulia he recognized von St. Paul-Ilaire; the specific name he assigned means violet (Gr. ion) flower (Gr. anthos). In their native Usambara Mountains cloudforests, the plants are threatened with extinction.^[9]

After World War I it became part of the British mandate territory of Tanganyika. The British administration continued to reserve and exploit forests.^[6]

Development and tourism

Today, the population of the Usambara Mountains region has one of the highest growth rates (about 4% compared to the Tanzanian national average of 2.1%), a staggering amount of poverty, and highest densities of people in all of Tanzania.^[10] Most of the inhabitants are subsistence farmers who rely heavily on the forests around them for timber, medicinal plants, clearing for agriculture, and fuel wood.^[11]

70% of the original forest cover of the West and East Usambaras has been lost. ^[12] Major land and forest degradation remain a pressing issue.

There are still many places that attract visitors looking for experiences beyond developed tourist resorts. These include the trade town of Lushoto (German colonial era Wilhelmsthal), the once popular German resort Amani Nature Reserve and farm, and the Mazumbai University Forest, which is considered the last example of a pristine tropical forest in the East Usambaras.

See also

• Amani Research Institute
• Flora of East Tropical Africa

References

Citations

1. Lovett 1993, pp. 33–57.
2. Lundgren 1980
3. Murless 2013, p. 1.
4. Skinner 2005.
5. Conte 2004, p. 33.
6. UsambaraMountains.com
7. Rogers 2009
8. Korschun 2007
9. Our Vegetable Kingdom: global timetable of botany, agriculture, and horticulture history. . accessed 4.29.2015
10. R. Matthews 2009
11. S. Kiparo 2009
12. Doggart, Lovett & Mhoro 2005.

Sources

• Conte, Christopher Allan (2004-01-01). Highland Sanctuary: Environmental History in Tanzania's Usambara Mountains. Ohio University Press. ISBN 978-0-8214-1554-2. Retrieved 2013-09-08.
• Doggart, N.H.; Lovett, J.; Mhoro, B.; Kiure J.,; Burgess, N.D. (2005). "Biodiversity surveys in eleven Forest Reserves in the vicinity of the Uluguru Mountains, Tanzania.". Wildlife Conservation Society of Tanzania, and Tanzania Forest Conservation Group, Dar es Salaam, Tanzania.
• Lovett, J.C. (1993). "Eastern Arc moist forest flora". Biogeography and Ecology of the Rain Forests of Eastern Africa. Cambridge, UK: Cambridge University Press.
• Murless, Peter (2013). "The Usambara Mountains of Tanzania" (PDF). Irente Biodiversity Reserve. Retrieved 2013-09-08.
• Skinner, Annabel (2005). "Tanzania & Zanzibar (Chapter: South from Kilimanjaro – Usambara Mountains)". Retrieved 2013-09-09.

Additional reading

• Forest history in East Africa's Eastern Arc Mountains: Biological science and the uses of history by Christopher A. Conte in: BioScience Vol. 60/4 (2010), pp. 309–313.
• The biological importance of the Eastern Arc Mountains of Tanzania and Kenya by N.D. Burgessa, T.M. Butynski, N.J. Cordeiroe, N.H. Doggart, J. Fjeldså, K.M. Howell, F.B. Kilahama, S.P. Loader, J.C. Lovett, B. Mbilinyi, M. Menegon, D.C. Moyer, E. Nashanda, A. Perkin, F. Rovero, W.T. Stanley and S.N. Stuart in: Biological Conservation Vol. 134/2 (2007), pp. 209–231.
• The importance of Nilo and Nguu North Forest Reserves for the conservation of montane forest birds in Tanzania by Seddon, N., Capper, D.R., Ekstrom, J.M., Isherwood, I.S., Muna, R., Pople, R.G., Tarimo, E. and Timothy, J. in: Biological Conservation Vol. 87 (1999), pp. 59–72.
• Forest Conservation in the East Usambara Mountains, Tanzania by A.C. Hamilton, R. Bensted-Smith and IUCN Tropical Forest Programme (1989, Illustrated book)
• "Route to a Regional Past: An Archaeology of the Lower Pangani (Ruvu) Basin, Tanzania, 500-1900 CE" by Jonathan Walz (2010). Ph.D. Dissertation, University of Florida, Gainesville.

External links

• UsambaraMountains.com: Usambara Mountains website
• Bird watching in the Usambara Mountains
• Tropical-biology.org: Introduction and fieldguide for the Amani Nature Reserve
• Kew.org: The Botanical Research Institute at Amani Nature Reserve

Coordinates: 4°45′S 38°30′E / 4.750°S 38.500°E