Bushclump-grass interactions: influence of bushclumps on their local environment in a south-east African savanna

1999 ◽  
Vol 16 (1) ◽  
pp. 32-43 ◽  
Author(s):  
L.C. Jarvel ◽  
T.G. O'Connor
Keyword(s):  
Local Environment ◽  
East African ◽  
African Savanna

Density dependence and the spread of invasive big-headed ants (Pheidole megacephala) in an East African savanna

Oecologia ◽  
2021 ◽  
Author(s):  
Alejandro G. Pietrek ◽  
Jacob R. Goheen ◽  
Corinna Riginos ◽  
Nelly J. Maiyo ◽  
Todd M. Palmer
Keyword(s):  
Density Dependence ◽  
East African ◽  
African Savanna ◽  
Pheidole Megacephala

scholarly journals Qualitative Modelling for Bridging Expert-Knowledge and the Social-Ecological Dynamics of an East African Savanna

2021 ◽  
Author(s):  
Maximilien Cosme ◽  
Christelle Hély ◽  
Franck Pommereau ◽  
Paolo Pasquariello ◽  
Christel Tiberi ◽  
...  
Keyword(s):  
Expert Knowledge ◽  
Discrete Event ◽  
Management Strategies ◽  
Dynamic Modelling ◽  
Quantitative Information ◽  
East African ◽  
African Savanna ◽  
Qualitative Modelling ◽  
Social Ecological ◽  
Economic Transitions

Sub-Saharan social-ecological systems are undergoing changes in environmental conditions, including modifications in rainfall pattern and biodiversity loss. Consequences of such changes depend on complex causal chains which call for integrated management strategies whose efficiency could benefit from ecosystem dynamic modelling. However, ecosystem models often require lots of quantitative information for estimating parameters, which is often unavailable. Alternatively, qualitative modelling frameworks have proved useful for explaining ecosystem response to perturbations, while requiring fewer information and providing more general predictions. However, current qualitative methods have some shortcomings which may limit their utility for specific issues. In this paper, we propose the Ecological Discrete-Event Network (EDEN), an innovative qualitative dynamic modelling framework based on "if-then" rules which generates many alternative event sequences (trajectories). Based on expert knowledge, observations and literature, we use this framework to assess the effect of permanent changes in surface water and herbivores diversity on vegetation and socio-economic transitions in an East African savanna. Results show that water availability drives changes in vegetation and socio-economic transitions, while herbivore functional groups had highly contrasted effects depending on the group. This first use of EDEN in a savanna context is promising for bridging expert knowledge and ecosystem modelling.

Seasonal patterns in decomposition and nutrient release from East African savanna grasses grown under contrasting nutrient conditions

2014 ◽  
Vol 188 ◽  
pp. 12-19 ◽  
Author(s):  
Lucy W. Ngatia ◽  
K. Ramesh Reddy ◽  
P.K. Ramachandran Nair ◽  
Robert M. Pringle ◽  
Todd M. Palmer ◽  
...  
Keyword(s):  
Nutrient Release ◽  
Seasonal Patterns ◽  
East African ◽  
African Savanna ◽  
Nutrient Conditions

The breeding season and diet of Arvicanthis in northern Nigeria

1989 ◽  
Vol 5 (4) ◽  
pp. 375-386 ◽  
Author(s):  
Safianu Rabiu ◽  
Martin Fisher
Keyword(s):  
Breeding Season ◽  
Food Supply ◽  
Rainy Season ◽  
Dry Season ◽  
Northern Nigeria ◽  
East African ◽  
African Savanna ◽  
Seasonal Differences ◽  
Sudan Savanna ◽  
Semi Arid

ABSTRACTThe breeding season and diet of the rat Arvicanthis was monitored from December 1983 to November 1985 in the semi-arid Sudan savanna at Kano, Nigeria, West Africa. Breeding began 1–2 months before the start of the rainy season and ceased at the beginning of the dry season. The diet of Arvicanthis was omnivorous, but with seasonal differences. Monocotyledons and dicotyledons predominated in the diet in the dry season, with seeds and insects increasing in the diet in the rainy season. The major differences between the ecology of Arvicanthis at Kano and on the East African savanna were that in East Africa the breeding season is longer and begins after the start of the rainy season. These and other dissimilarities between the biology of Arvicanthis in the two areas could be due to the effect of climatic differences on food supply and to the possible existence of different taxonomic groupings of Arvicanthis in the two regions.

scholarly journals Spatial vegetation patterns and neighborhood competition among woody plants in an East African savanna

Ecology ◽  
2017 ◽  
Vol 98 (2) ◽  
pp. 478-488 ◽  
Author(s):  
Justin Dohn ◽  
David J. Augustine ◽  
Niall P. Hanan ◽  
Jayashree Ratnam ◽  
Mahesh Sankaran
Keyword(s):  
Woody Plants ◽  
Vegetation Patterns ◽  
East African ◽  
African Savanna ◽  
Neighborhood Competition

Hydraulic lift in Acacia tortilis trees on an East African savanna

Oecologia ◽  
2002 ◽  
Vol 134 (3) ◽  
pp. 293-300 ◽  
Author(s):  
F. Ludwig ◽  
T. E. Dawson ◽  
H. de Kroon ◽  
F. Berendse ◽  
H. H. T. Prins
Keyword(s):  
Hydraulic Lift ◽  
Acacia Tortilis ◽  
East African ◽  
African Savanna
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