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Interactions between large herbivores and litter removal by termites across a rainfall gradient in a South African savanna

  • Robert Buitenwerf (a1), Nicola Stevens (a2), Cleo M. Gosling (a1), T. Michael Anderson (a3) and Han Olff (a1)...

Abstract:

Litter-feeding termites influence key aspects of the structure and functioning of semi-arid ecosystems around the world by altering nutrient and material fluxes, affecting primary production, foodweb dynamics and modifying vegetation composition. Understanding these complex effects depends on quantifying spatial heterogeneity in termite foraging activities, yet such information is scarce for semi-arid savannas. Here, the amount of litter that was removed from 800 litterbags in eight plots (100 litterbags per plot) was measured in Hluhluwe–iMfolozi Park (HiP) South Africa. These data were used to quantify variation in litter removal at two spatial scales: the local scale (within 450-m2 plots) and the landscape scale (among sites separated by 8–25 km). Subsequently, we attempted to understand the possible determinants of termites’ foraging patterns by testing various ecological correlates, such as plant biomass and bare ground at small scales and rainfall and fences that excluded large mammalian herbivores at larger scales. No strong predictors for heterogeneity in termite foraging intensity were found at the local scale. At the landscape scale termite consumption depended on an interaction between rainfall and the presence of large mammalian herbivores: litter removal by termites was greater in the presence of large herbivores at the drier sites but lower in the presence of large herbivores at the wetter sites. The effect of herbivores on termite foraging intensity may indicate a switch between termites and large herbivore facilitation and competition across a productivity gradient. In general, litter removal decreased with increasing mean annual rainfall, which is in contrast to current understanding of termite consumption across rainfall and productivity gradients. These results generate novel insights into termite ecology and interactions among consumers of vastly different body sizes across spatial scales.

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Corresponding author

1Corresponding author. Current address: Department of Botany, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa. Email: buitenwerfrobert@hotmail.com

References

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ABENSPERGTRAUN, M. 1992. The effects of sheep-grazing on the subterranean termite fauna (Isoptera) of the Western-Australian wheat-belt. Australian Journal of Ecology 17:425432.
ABENSPERGTRAUN, M. & MILEWSKI, A. V. 1995. Abundance and diversity of termites (Isoptera) in unburnt versus burnt vegetation at the Barrens in mediterranean Western-Australia. Australian Journal of Ecology 20:413417.
ANDERSON, T. M., DEMPEWOLF, J., METZGER, K. L., REED, D. N. & SERNEELS, S. 2008. Generation and maintenance of heterogeneity in the Serengeti ecosystem. Pp. 135182 in Sinclair, A. R. E., Packer, C., Mduma, S. A. R. & Fryxell, J. M. (eds.). Serengeti III: human impacts on ecosystem dynamics. The University of Chicago Press, Chicago.
BALFOUR, D. A. & HOWISON, O. E. 2001. Spatial and temporal variation in a mesic savanna fire regime: responses to variation in annual rainfall. African Journal of Range and Forage Science 19:4351.
BELSKY, A. J., AMUNDSON, R. G., DUXBURY, J. M., RIHA, S. J., ALI, A. R. & MWONGA, S. M. 1989. The effects of trees on their physical, chemical, and biological environments in a semi-arid savanna in Kenya. Journal of Applied Ecology 26:10051024.
BIGNELL, D. E. & EGGLETON, P. 2000. Termites in ecosystems. Pp. 363387 in Abe, T., Bignell, D. & Higashi, M. (eds.). Termites: evolution, sociality, symbioses, ecology. Kluwer Academic Publishers, Dordrecht.
BODINE, M. C. & UECKERT, D. N. 1975. Effect of desert termites on herbage and litter in a shortgrass ecosystem in west Texas. Journal of Range Management 28:353358.
BRANSBY, D. I. & TAINTON, N. M. 1977. The disk pasture meter: possible applications in grazing management. Proceedings of the Grassland Society of Southern Africa 5:115118.
BUXTON, R. D. 1981. Changes in the composition and activities of termite communities in relation to changing rainfall. Oecologia 51:371378.
COATON, W. G. H. & SHEASBY, J. L. 1972. Preliminary report on a survey of the termites (Isoptera) of South West Africa. Plant Protection Research Institute, Pretoria. 129 pp.
CROMSIGT, J. P. G. M., PRINS, H. H. T. & OLFF, H. 2009. Habitat heterogeneity as a driver of ungulate diversity and distribution patterns: interaction of body mass and digestive strategy. Diversity and Distributions 15:513522.
CUMMING, D. H. M. & CUMMING, G. S. 2003. Ungulate community structure and ecological processes: body size, hoof area and trampling in African savannas. Oecologia 134:560568.
DANGERFIELD, J. M. & SCHUURMAN, G. 2000. Foraging by fungus-growing termites (Isoptera: Termitidae, Macrotermitinae) in the Okavango Delta, Botswana. Journal of Tropical Ecology 16:717731.
DANGERFIELD, J. M., MCCARTHY, T. S. & ELLERY, W. N. 1998. The mound-building termite Macrotermes michaelseni as an ecosystem engineer. Journal of Tropical Ecology 14:507520.
DESHMUKH, I. 1989. How important are termites in the production ecology of African savannas? Sociobiology 15:155168.
FERRAR, P. 1982. Termites of a South African savanna 1. List of species and subhabitat preferences. Oecologia 52:125132.
FOX-DOBBS, K., DOAK, D. F., BRODY, A. K. & PALMER, T. M. 2010. Termites create spatial structure and govern ecosystem function by affecting N2 fixation in an East African savanna. Ecology 91:12961307.
FREYMANN, B. P., BUITENWERF, R., DESOUZA, O. & OLFF, H. 2008. The importance of termites (Isoptera) for the recycling of herbivore dung in tropical ecosystems: a review. European Journal of Entomology 105:165173.
GLOVER, P. E., TRUMP, E. C. & WATERIDGE, L. E. D. 1964. Termitaria and vegetation patterns on the Loita plains of Kenya. Journal of Ecology 52:367377.
GOUDIE, A. S. 1988. The geomorphological role of termites and earthworms in the tropics. Pp. 166191 in Viles, H. A. (ed.). Biogeomorphology. Blackwell, Oxford.
GRANT, C. C. & SCHOLES, M. C. 2006. The importance of nutrient hot-spots in the conservation and management of large wild mammalian herbivores in semi-arid savannas. Biological Conservation 130:426437.
HEIDECKER, J. L. & LEUTHOLD, R. H. 1984. The organisation of collective foraging in the harvester termite Hodotermes mossambicus (Isoptera). Behavioral Ecology and Sociobiology 14:195202.
HOLT, J. A. & LEPAGE, M. 2000. Termites and soil properties. Pp. 389407 in Abe, T., Bignell, D. E. & Higashi, M. (eds.). Termites: evolution, sociality, symbioses, ecology. Kluwer Academic Publishers, Dordrecht.
JOUQUET, P., TESSIER, D. & LEPAGE, M. 2004. The soil structural stability of termite nests: role of clays in Macrotermes bellicosus (Isoptera, Macrotermitinae) mound soils. European Journal of Soil Biology 40:2329.
JOUQUET, P., TAVERNIER, V., ABBADIE, L. & LEPAGE, M. 2005. Nests of subterranean fungus-growing termites (Isoptera, Macrotermitinae) as nutrient patches for grasses in savannah ecosystems. African Journal of Ecology 43:191196.
KING, L. 1970. The geology of the Hluhluwe Game Reserve. Petros 2:1619.
LOVERIDGE, J. P. & MOE, S. R. 2004. Termitaria as browsing hotspots for African megaherbivores in miombo woodland. Journal of Tropical Ecology 20:337343.
MASUMELELE, M. L. 2007. Decomposition of grasses in a South African savanna. M.Sc. thesis, University of Cape Town, Cape Town. 124 pp.
MEYER, V. W. 2001. Intracolonial demography, biomass and food consumption of Macrotermes natalensis (Haviland) (Isoptera: Termitidae) colonies in the northern Kruger National Park, South Africa. Ph.D. thesis, University of Pretoria, Pretoria. 84 pp.
MEYER, V. W., BRAACK, L. E. O., BIGGS, H. C. & EBERSOHN, C. 1999. Distribution and density of termite mounds in the northern Kruger National Park, with specific reference to those constructed by Macrotermes Holmgren (Isoptera: Termitidae). African Entomology 7:123130.
MITCHELL, J. D. 2002. Termites as pests of crops, forestry, rangeland and structures in southern Africa and their control. Sociobiology 40:4769.
MOE, S. R., MOBAEK, R. & NARMO, A. K. 2009. Mound building termites contribute to savanna vegetation heterogeneity. Plant Ecology 202:3140.
MORDELET, P. & MENAUT, J. C. 1995. Influence of trees on aboveground production dynamics of grasses in a humid savanna. Journal of Vegetation Science 6:223228.
PICKER, M. D., HOFFMAN, M. T. & LEVERTON, B. 2007. Density of Microhodotermes viator (Hodotermitidae) mounds in southern Africa in relation to rainfall and vegetative productivity gradients. Journal of Zoology 271:3744.
PICKETT, S. T. A., CADENASSO, M. L. & BENNING, T. L. 2003. Biotic and abiotic variability as key determinants of savanna heterogeneity at multiple spatiotemporal scales. Pp. 2240 in du Toit, J. T., Rogers, K. H. & Biggs, H. C. (eds.). The Kruger experience: ecology and management of savanna heterogeneity. Island Press, Washington.
PINHEIRO, J. C. & BATES, D. M. 2000. Mixed-effects models in S and S-PLUS. Springer Verlag, New York. 528 pp.
POMEROY, D. E. 1978. The abundance of large termite mounds in Uganda in relation to their environment. Journal of Applied Ecology 15:5163.
PRINGLE, R. M., DOAK, D. F., BRODY, A. K., JOCQUE, R. & PALMER, T. M. 2010. Spatial pattern enhances ecosystem functioning in an African savanna. PLoS Biology 8:e1000377.
RATNAM, J., SANKARAN, M., HANAN, N. P., GRANT, R. C. & ZAMBATIS, N. 2008. Nutrient resorption patterns of plant functional groups in a tropical savanna: variation and functional significance. Oecologia 157:141151.
ROSENZWEIG, M. L. 1968. Net primary productivity of terrestrial communities: prediction from climatological data. American Naturalist 102:6774.
ROULAND, C., LEPAGE, M., CHOTTE, J. L., DIOUF, M., NDIAYE, D., NDIAYE, S., SEUGE, C. & BRAUMAN, A. 2003. Experimental manipulation of termites (Isoptera, Macrotermitinae) foraging patterns in a Sahelo-Sudanese savanna: effect of litter quality. Insectes Sociaux 50:309316.
RUTHERFORD, M. C. 1981. Annual plant-production precipitation relations in arid and semi-arid regions. South African Journal of Science 76:5356.
SCHOLES, R. J. 1990. The influence of soil fertility on the ecology of southern African dry savannas. Journal of Biogeography 17:415419.
SCHOLES, R. J. & WALKER, B. H. 1993. An African savanna, synthesis of the Nylsvley study. Cambridge University Press, Cambridge. 306 pp.
TRACY, K. N., GOLDEN, D. M. & CRIST, T. O. 1998. The spatial distribution of termite activity in grazed and ungrazed Chihuahuan desert grassland. Journal of Arid Environments 40:7789.
TRAORE, S. & LEPAGE, M. 2008. Effects of controlled livestock grazing and annual prescribed fire on epigeal termite mounds in a savannah woodland in Burkina Faso. Insectes Sociaux 55:183189.
TURNER, M. G. 1989. Landscape ecology: the effect of pattern on process. Annual Review of Ecology and Systematics 20:171197.
UYS, V. 2002. A guide to the termite genera of southern Africa. ARC-Plant protection Research Institute, Pretoria. 116 pp.
WALDRAM, M. S., BOND, W. J. & STOCK, W. D. 2008. Ecological engineering by a mega-grazer: white rhino impacts on a South African savanna. Ecosystems 11:101112.
WHATELEY, A. & PORTER, R. N. 1983. The woody vegetation communities of the Hluhluwe-Corridor–Umfolozi Game Reserve complex. Bothalia 14:745758.
WHITFORD, W. G., STEINBERGER, Y. & ETTERSHANK, G. 1982. Contributions of subterranean termites to the economy of Chihuahuan desert ecosystems. Oecologia 55:298302.
WOOD, T. G. & SANDS, W. A. 1978. The role of termites in ecosystems. Pp. 245292 in Brian, M. V. (ed.). Production ecology of ants and termites. Cambridge University Press, Cambridge.
ZAADY, E., GROFFMAN, P. M., SHACHAK, M. & WILBY, A. 2003. Consumption and release of nitrogen by the harvester termite Anacanthotermes ubachi navas in the northern Negev desert, Israel. Soil Biology and Biochemistry 35:12991303.

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