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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
The influence of termite-induced heterogeneity on savanna vegetation along a climatic gradient in West Africa
Journal of Tropical Ecology, Volume 29, No. 1, Year 2013
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Description
Termites are renowned ecosystem engineers. Their mounds have been described as an important element of savanna vegetation dynamics, but little is known about their large-scale impact on vegetation composition. To investigate the influence of termite-induced heterogeneity in savannas along a climatic gradient in West Africa termite mound vegetation was compared with adjacent savanna vegetation using 256 paired plots (size of the termite mound and a corresponding savanna area) in five protected areas from northern Burkina Faso to northern Benin. On each plot vegetation and soil sampling was performed. Additionally bioclimatic variables from the WORLDCLIM database were used. The vegetation on the mounds and the surrounding savanna differed within all study sites (DCA length of gradient 3.85 SD) and showed complete turnover along the climatic gradient (DCA length of gradient 5.99 SD). Differences between mounds and savanna were significantly related to termite-induced changes in soil parameters, specifically clay enrichment and increased cation concentrations (base saturation). On a local scale, termite-induced differences in soil conditions were found to be the most important factor affecting mound vegetation, while on a regional scale, annual precipitation showed the strongest significant correlations. However, with increasing precipitation, differences between mounds and the surrounding matrix became more pronounced, and the contribution of mounds to local phytodiversity increased. Eleven plant species were identified as characteristic termite mound species. In the more humid parts of the gradient, more characteristic plant species were found that may benefit from favourable soil conditions, good water availability, and a low fire impact in the mound microhabitat. © 2012 Cambridge University Press.
Authors & Co-Authors
Erpenbach, Arne
Germany, Frankfurt am Main
Goethe-universität Frankfurt am Main
Bernhardt-Römermann, Markus
Germany, Regensburg
Universität Regensburg
Wittig, Rüdiger
Germany, Frankfurt am Main
Senckenberg Biodiversität Und Klima Forschungszentrum
Thiombiano, Adjima M.Emmanuel
Burkina Faso, Ouagadougou
University of Ouagadougou
Hahn, Karen
Germany, Frankfurt am Main
Senckenberg Biodiversität Und Klima Forschungszentrum
Statistics
Citations: 39
Authors: 5
Affiliations: 4
Identifiers
Doi:
10.1017/S0266467412000703
ISSN:
02664674
e-ISSN:
14697831
Research Areas
Environmental
Genetics And Genomics
Study Approach
Qualitative
Study Locations
Multi-countries
Benin
Burkina Faso