scholarly journals Diversity and evolution of African Grass Rats (Muridae: Arvicanthis )—From radiation in East Africa to repeated colonization of northwestern and southeastern savannas

2019 ◽  
Vol 57 (4) ◽  
pp. 970-988 ◽  
Author(s):  
Josef Bryja ◽  
Paolo Colangelo ◽  
Leonid A. Lavrenchenko ◽  
Yonas Meheretu ◽  
Radim Šumbera ◽  
...  
Keyword(s):  
East Africa ◽  
African Grass

An Altitudinal Cline in Tropical African Grass Floras and Its Paleoecological Significance

1980 ◽  
Vol 13 (3) ◽  
pp. 392-402 ◽  
Author(s):  
D.A. Livingstone ◽  
W. D. Clayton
Keyword(s):  
East Africa ◽  
Regular Function ◽  
Confidence Limits ◽  
Tropical Africa ◽  
Altitudinal Distribution ◽  
African Grass

AbstractAt altitudes below 1300 m most species of grasses in tropical Africa are ones that use 4-carbon photosynthesis. Above 4000 m only species of the subfamily Pooideae using 3-carbon photosynthesis are found. At intermediate altitudes the percent of 3-carbon genera and species in the grass flora is a very regular function of altitude. The correlate of altitude that controls the distribution of grasses appears to be temperature. Fossil grass cuticles are identifiable to genus and should provide a useful paleothermometer. If no other errors were involved, the regular altitudinal distribution of genera in the flora of tropical East Africa would permit paleotemperature estimates with 95% confidence limits of ± 1.2°C.

Drawers of Water II: assessing change in domestic water use in East Africa

Waterlines ◽  
2003 ◽  
Vol 22 (1) ◽  
pp. 22-25 ◽  
Author(s):  
John Thompson ◽  
Ina Porras ◽  
Munguti Katui-Katua ◽  
Mark Mujwahuzi ◽  
James Tumwine
Keyword(s):  
East Africa ◽  
Water Use ◽  
Domestic Water

Coffee and qat on the Royal Danish expedition to Arabia – botanical, ethnobotanical and commercial observations made in Yemen 1762–1763

2015 ◽  
Vol 42 (1) ◽  
pp. 101-112
Author(s):  
I. Friis
Keyword(s):  
East Africa ◽  
Arabian Peninsula ◽  
Made In

In spite of widespread consumption of coffee in Europe at the time of the Royal Danish expedition to Arabia 1761–1767, little was known of the cultivation of coffee in Yemen and of the Arabian coffee export to Europe. Fresh leaves of qat were used as a stimulant on the Arabian Peninsula and in East Africa, but before the Royal Danish expedition to Arabia this plant was known in Europe only from secondary reports. Two members of the expedition, Carsten Niebuhr and Peter Forsskål, pioneered studies of coffee and qat in Yemen and of the Arabian coffee export. Linnaeus' instructions for travellers requested observations on the use of coffee, but otherwise Forsskål and Niebuhr's studies of coffee and qat were made entirely on their own initiative. Now, 250 years after The Royal Danish expedition to Arabia, coffee has become one of the world's most valuable trade commodities and qat has become a widely used and banned drug.

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