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Differing influences of resource availability on the demographics and habitat selection of wildebeest compared with impala

Published online by Cambridge University Press:  22 April 2014

Christopher A.J. O'Kane*
Affiliation:
Wildlife Conservation Research Unit, Department of Zoology, University of Oxford, The Recanati-Kaplan Centre, Tubney House, Abingdon Road, Tubney, Oxon OX13 5QL, UK School of Biological and Conservation Sciences, Westville Campus, University of KwaZulu Natal, Private Bag X 54001, Durban 4000, South Africa
Bruce R. Page
Affiliation:
School of Biological and Conservation Sciences, Westville Campus, University of KwaZulu Natal, Private Bag X 54001, Durban 4000, South Africa
David W. Macdonald
Affiliation:
Wildlife Conservation Research Unit, Department of Zoology, University of Oxford, The Recanati-Kaplan Centre, Tubney House, Abingdon Road, Tubney, Oxon OX13 5QL, UK
*
1 Corresponding author. Email: [email protected]

Abstract:

Although what drives the abundance and habitat selection of ungulates is a long-standing question, coherent datasets investigating the influences of rainfall, competition and fire on ungulates are unusual. Over 4 y we carried out extensive monthly road transects in Ithala Game Reserve, South Africa, to determine the demographics and habitat occupancy of the region's prevalent grazer (wildebeest) and mixed-feeder (impala). Habitat occupancy was determined using a GIS-based approach. We obtained 8742 sighting records, encompassing 8400 wildebeest and 10071 impala. Annual rainfall did not significantly correlate with population sizes of either species. Fecundity of wildebeest, but not of impala, showed a significant positive relationship with rainfall specifically over the perinatal period (November–December), whilst no significant relationships were found for either species between fecundity and rainfall over the previous year, 2 y, rut (February–April) or height of the dry season (June–August). Impala unexpectedly favoured browse habitats to grassland year round, probably consequent on competition for grass with wildebeest. Dry-season grass flushes attracted both wildebeest and impala. The study emphasized how rainfall, competition and fire regimes may affect differently grazers compared with mixed-feeders.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2014 

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References

LITERATURE CITED

ATTWELL, C. A. M. 1977. Reproduction and population ecology of the blue wildebeest Connochaetes taurinus taurinus in Zululand. Ph.D. dissertation. University of Natal, Pietermaritzburg. 446 pp.Google Scholar
ATTWELL, C. A. M. & HANKS, J. 1980. Reproduction of the blue wildebeest Connochaetes taurinus taurinus in Zululand, South Africa. Saugetierkundliche Mitteilungen 28:264281.Google Scholar
BALCOMB, S. 1996. Vegetation mapping and a quantitive study of the altitudinal distribution of the genera Acacia, Euclea and Rhus in Itala Game Reserve, Kwazulu-Natal. Department of Grassland Science, University of Natal, Pietermaritzburg. 42 pp.Google Scholar
BROOKS, P. M. 1975. The sexual structure of an impala population and its relationship to an intensive game removal programme. The Lammergeyer 22:17.Google Scholar
BROOKS, P. M. 1985. Classification of large herbivores in Ithala Game Reserve. Natal Parks Board, Pietermaritzburg. 18 pp.Google Scholar
BUCKLAND, S. T., ANDERSON, D. R., BURNHAM, K. P., LAAKE, J. L., BORCHERS, D. L. & THOMAS, L. 2001. Introduction to distance sampling: estimating abundance of biological populations. Oxford University Press, Oxford. 432 pp.Google Scholar
COE, M. J., CUMMING, D. H. & PHILLIPSON, J. 1976. Biomass and production of large African herbivores in relation to rainfall and primary production. Oecologia 22:341354.Google Scholar
CRAWLEY, M. J. 2005. Statistics: an introduction using R. John Wiley and Sons, Chichester. 327 pp.CrossRefGoogle Scholar
DEKKER, B., VAN ROOYEN, N. & BOTHMA, J. D. P. 1996. Habitat partitioning by ungulates on a game ranch in the Mopani veld. South African Journal of Wildlife Research 26:117122.Google Scholar
DUNHAM, K. 1980. The diet of impala (Aepyceros melampus) in the Sengwa Wildlife Research Area, Rhodesia. Journal of Zoology (London) 192:4157.Google Scholar
EAST, R. 1984. Rainfall, soil nutrient status and biomass of large African savanna mammals. African Journal of Ecology 22:245270.Google Scholar
FIELD, C. R. & LAWS, R. M. 1970. The distribution of the larger herbivores in the Queen Elizabeth National Park,Uganda. Journal of Applied Ecology 7:273294.Google Scholar
HANSEN, R. M., MUGAMBI, M. M. & BAUNI, S. M. 1985. Diets and trophic ranking of ungulates of the northern Serengeti. Journal of Wildlife Management 49:823827.Google Scholar
JARMAN, P. J. 1972. Seasonal distribution of large mammal populations in the unflooded Middle Zambezi Valley. Journal of Applied Ecology 9:283299.CrossRefGoogle Scholar
JARMAN, P. J. & JARMAN, M. V. 1973. Social behaviour, population structure and reproductive potential in impala. East African Wildlife Journal 11:329338.CrossRefGoogle Scholar
JOHNSON, L. B. 1990. Analysing spatial and temporal phenomena using geographical information systems. Landscape Ecology 4:3143.Google Scholar
KEDDY, P. A. 2001. Competition. (Second edition). Kluwer, Dordrecht. 576 pp.Google Scholar
KLEYNHANS, E. J., JOLLES, A. E., BOS, M. R. E. & OLFF, H. 2011. Resource partitioning along multiple niche dimensions in differently sized African savanna grazers. Oikos 120:591600.Google Scholar
KREULEN, D. 1975. Wildebeest habitat selection on the Serengeti Plains, Tanzania in relation to calcium and lactation: a preliminary report. East African Wildlife Journal 13:297304.Google Scholar
LAMPREY, H. F. 1963. Ecological separation of the large mammal species in the Tarangire Game Reserve, Tanganyika. East African Wildlife Journal 1:6392.Google Scholar
LOW, A. B. & REBELO, A. G. 1996. Vegetation of South Africa, Lesotho and Swaziland. Department of Environmental Affairs & Tourism, Pretoria. 423 pp.Google Scholar
MASON, D. R. 1990. Juvenile survival and population structure of blue wildebeest and warthogs in the Central Region of the Kruger National Park during the mid-summer drought of 1988/89. Koedoe 33:2945.CrossRefGoogle Scholar
MCNAUGHTON, S. J. 1985. Ecology of a grazing ecosystem: the Serengeti. Ecological Monographs 55:259294.Google Scholar
MEISSNER, H. H., PIETERSE, E. & POTGIETER, J. H. J. 1996. Seasonal food selection and intake by male impala Aepyceros melampus in two habitats. South African Journal of Wildlife Research 26:5663.Google Scholar
MOE, S. R., WEGGE, P. & KAPELA, E. B. 1990. The influence of man-made fires on large wild herbivores in Lake Burungi area in Northern Tanzania. African Journal of Ecology 28:3543.Google Scholar
MOE, S. R., RUTINA, L. P. & DU TOIT, J. T. 2007. Trade-off between resource seasonality and predation risk explains reproductive chronology in impala. Journal of Zoology (London) 273:237243.Google Scholar
MURRAY, M. G. 1982. The rut of impala – aspects of seasonal mating under tropical conditions. Zeitschrift für Tierpsychologie – Journal of Comparative Ethology 59:319337.CrossRefGoogle Scholar
NORTON-GRIFFITHS, M. 1979. The influence of grazing, browsing and fire on the vegetation dynamics of the Serengeti. Pp. 310352 in Sinclair, A. R. E. & Norton-Griffiths, M. (eds.). Serengeti: dynamics of an ecosystem. University of Chicago Press, Chicago.Google Scholar
O'KANE, C. A. J., DUFFY, K., PAGE, B. & MACDONALD, D. W. 2013a. Effects of resource limitation on habitat usage by the browser guild in HluhluweiMfolozi Park, South Africa. Journal of Tropical Ecology 29:3947.Google Scholar
O'KANE, C. A. J., DUFFY, K., PAGE, B. & MACDONALD, D. W. 2013b. Model highlights likely long-term influences of mesobrowsers versus those of elephant on woodland dynamics. African Journal of Ecology. doi: 10.1111/aje.12103.Google Scholar
OWEN-SMITH, N. & MILLS, M. G. L. 2006. Manifold interactive influences on the population dynamics of a multispecies ungulate assemblage. Ecological Monographs 76:7392.CrossRefGoogle Scholar
OWEN-SMITH, N., MASON, D. R. & OGUTU, J. O. 2005. Correlates of survival rates for 10 African ungulate populations: density, rainfall and predation. Journal of Animal Ecology 74:774788.Google Scholar
OWEN-SMITH, R. N. 1988. Megaherbivores. The influence of very large body size on ecology. Cambridge University Press, Cambridge. 382 pp.Google Scholar
PIANKA, E. R. 1972. r and K-selection or b and d selection? American Naturalist 106:581588.Google Scholar
PIANKA, E. R. 1976. Competition and niche theory. Pp. 114141 in May, R. M. (ed.). Theoretical ecology. Principles and applications. Blackwell Scientific Publications, Oxford.Google Scholar
POOLEY, E. S. 2003. The complete field guide to trees of Natal, Zululand & Transkei. Natal Flora Publications Trust, Durban. 512 pp.Google Scholar
PORTER, R. N. 1983. The woody plant communities of Itala Nature Reserve. Natal Parks Board, Pietermaritzburg. 18 pp.Google Scholar
RASMUSSEN, H. B., WITTEMYER, G. & DOUGLAS-HAMILTON, I. 2006. Predicting time-specific changes in demographic processes using remote-sensing data. Journal of Applied Ecology 43:366376.CrossRefGoogle Scholar
RODGERS, W. A. 1976. Seasonal diet preferences of impala from South East Tanzania. East African Wildlife Journal 14:331333.CrossRefGoogle Scholar
ROWE-ROWE, D. T. 1982. The influence of fire on antelope distribution and abundance in the Natal Drakensberg. South African Journal of Wildlife Research 12:124129.Google Scholar
SENSENIG, R. L., DEMMENT, M. W. & LACA, E. A. 2010. Allometric scaling predicts preferences for burned patches in a guild of East African grazers. Ecology 91:28982907.Google Scholar
SMITHERS, R. H. N. 1983. The mammals of the southern African subregion. University of Pretoria, Pretoria. 566 pp.Google Scholar
SPONHEIMER, C. C., DE RUITER, D. J., LEE-THORP, J. A., CODRON, D.M. & CODRON, J. 2003. Diets of impala from Kruger National Park: evidence from stable carbon isotopes. Koedoe 46:101106.Google Scholar
TURNER, D. P. 1980. Soil survey of the central Pongola River catchment – Itala Nature Reserve Planning Project. Soil and Irrigation Research Institute, Pretoria. 11 pp.Google Scholar
VALEIX, M., FRITZ, H., CHAMAILLE-JAMMES, S., BOURGAREL, M. & MURINDAGOMO, F. 2008. Fluctuations in abundance of large herbivore populations: insights into the influence of dry season rainfall and elephant numbers from long-term data. Animal Conservation 11:391400.CrossRefGoogle Scholar
WRONSKI, T. 2002. Feeding ecology and foraging behaviour of impala (Aepyceros melampus) in Lake Mburo National Park, Uganda. African Journal of Ecology 40.Google Scholar
WRONSKI, T. 2003. Fire induced changes in the foraging behaviour of impala Aepyceros melampus in the Lake Mburo National Park, Uganda. African Journal of Ecology 41:5660.Google Scholar