Abstract
With biomass densities comparable to large ungulates and megaherbivores, termites play a key functional role in many tropical savanna ecosystems. This study focuses on vegetated termite mounds (termitaria) constructed by the Termitidae species Macrotermes herus. We studied how resource rich termitaria affect graminoid herbs (Poaceae and Cyperaceae), forbs and woody species composition and diversity. The density of termitaria explained 89% of the variation in dense thickets in the area. Fire tolerant Acacia species dominated the open savanna while fire sensitive species like Grewia spp. and the succulent Euphorbia candelabrum were restricted to termite mounds. Termitaria plots had four times the mean number of woody species and supported three times as many forb species as the adjacent savanna. For woody species, both the Shannon–Wiener index and the Shannon evenness index were higher on temitaria than on the savanna. There were no differences for graminoid herbs, except for the Shannon evenness index which was higher on termitaria. Our results indicate that graminoid herb richness peaks at lower productivity levels than trees and forbs in savanna ecosystems, as also recently found in temperate areas.
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Acknowledgements
We thank the Uganda Wildlife Authority and the Uganda National Council for Science and Technology for permission to conduct this study. J. Colman and O. G. Støen commented on earlier drafts of this manuscript. Dr. C. Bakuneeta and D. K. Aleper assisted during the study. O. Wanyana Magyani and Prof. K. A. Lye helped in identifying plant species. We are grateful to the park staff for their hospitality and support. In particular, we would like to thank K. T. Anderson for assistance in the field. This study was supported by grants from Noragric at the Norwegian University of Life Sciences and by NUFU.
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Moe, S.R., Mobæk, R. & Narmo, A.K. Mound building termites contribute to savanna vegetation heterogeneity. Plant Ecol 202, 31–40 (2009). https://doi.org/10.1007/s11258-009-9575-6
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DOI: https://doi.org/10.1007/s11258-009-9575-6