Patterns of resource use by livestock during and after drought on the commons of Namaqualand, South Africa

The aim of this study was to determine the effect of drought on grazing patterns of livestock in a communal rangeland in Namaqualand. Water points were the foci of almost all grazing routes even after the drought, and the areas away from the water points were less heavily utilized. The mountains could be regarded as key resource areas for livestock since the grazing intensity was higher in the elevated areas of the rangeland than on the surrounding low lying areas during and immediately after drought. Spatial patterns of resource use by livestock on the commons did not differ during the drought and post-drought period. The lengths of the daily grazing routes were similar for both periods. This may be a consequence of the weakness of animals during the drought when forage was scarce which prevented them from walking further. The size of home ranges of the herds did not change during the two monitoring periods. We attribute this to social reasons because herders try to avoid the mixing of herds. In the commons of Namaqualand, herders are also spatially constrained and this restricts their options to adapt to drought, and hence many animals died.

[1]  T. Bassett.  Fulani herd movements. , 1986 .

[2]  A. Lawrence,et al.  Home-range behaviour and social organization of Scottish Blackface sheep , 1988 .

[3]  M. Knight.  Ecology of the gemsbok Oryx gazella gazella (Linnaeus) and blue wildebeest Connochaetes taurinus (Burchell) in the southern Kalahari , 1991 .

[4]  I. Hoffmann.  Spatial Distribution of Cattle Herds as a Response to Natural and Social Environments. A Case Study From the Zamfara Reserve, Northwest Nigeria , 2002 .

[5]  E. Fratkin.  Stability and resilience in East African Pastoralism: The Rendille and the Ariaal of northern Kenya , 1986 .

[6]  Correlates of stocking rate and overgrazing in the Leliefontein Communal Reserve, central Namaqualand , 2000 .

[7]  M. Hoffman,et al.  A fence-line contrast reveals effects of heavy grazing on plant diversity and community composition in Namaqualand, South Africa , 1999, Plant Ecology.

[8]  M. Hoffman,et al.  Managing Variability: Herding Strategies in Communal Rangelands of Semiarid Namaqualand, South Africa , 2006 .

[9]  W. Bond,et al.  Movement response patterns of livestock to rainfall variability in the Richtersveld National Park , 2005 .

[10]  I. Scoones.  Exploiting heterogeneity:habitat use by cattle in dryland Zimbabwe , 1995 .

[11]  G. Pickup,et al.  Spatial distribution of cattle in arid rangelands as detected by patterns of change in vegetation cover , 1997 .

[12]  K. Nagy,et al.  Energy, water, and food use by springbok antelope (Antidorcas marsupialis) in the Kalahari Desert , 1994 .

[13]  E. Roth,et al.  Mobility and land use among African pastoralists: old conceptual problems and new interpretations. , 1994 .

[14]  E. Roth,et al.  African Pastoralist Systems: An Integrated Approach , 1994 .

[15]  R. Lange,et al.  The Piosphere: Sheep Track and Dung Patterns. , 1969 .

[16]  T. T. Nielsen,et al.  Going Where the Grass Is Greener: On the Study of Pastoral Mobility in Ferlo, Senegal , 2002 .

[17]  W. Low,et al.  Grazing distribution of free-ranging cattle at three sites in the Alice Springs District, Central Australia. , 1976 .

[18]  Management of the Old Field Vegetation in the Namaqua National Park, South Africa: Conflicting Demands of Conservation and Tourism , 2002 .

[19]  W. Leuthold,et al.  Movements and patterns of habitat utilization of elephants in Tsavo National Park, Kenya , 1973 .

[20]  S. Milton,et al.  Food selection by ostrich in Southern Africa , 1994 .

[21]  John D. C. Linnell,et al.  Habitat use and ecological correlates of home range size in a small cervid : the roe deer , 1996 .

[22]  Martin Vavra,et al.  Slope Use by Cattle, Feral Horses, Deer, and Bighorn Sheep , 1987 .

[23]  M. Bovin.  Nomads of the drought: Fulbe and Wodaabe nomads between power and marginalization in the Sahel of Burkina Faso and Niger Republic. , 1990 .

[24]  Daniela F. Sieff.  Herding Strategies of the Datoga Pastoralists of Tanzania: Is Household Labor a Limiting Factor , 1997 .

[25]  T. A. Hanley,et al.  Food Intake and Foraging Energetics of Elk and Mule Deer , 1984 .

[26]  R. Cowling,et al.  Namaqualand, South Africa – an overview of a unique winter-rainfall desert ecosystem , 1999, Plant Ecology.

[27]  Michael B. Coughenour,et al.  Invited Synthesis Paper: Spatial Components of Plant-Herbivore Interactions in Pastoral, Ranching, and Native Ungulate Ecosystems , 1991 .

[28]  M. Hoffman,et al.  Dynamics of grazing policy and practice: environmental and social impacts in three communal areas of southern Africa , 2006 .

[29]  W. Bond,et al.  Biodiversity conservation and pastoralism—reducing herd size in a communal livestock production system in Richtersveld National Park , 2007 .

[30]  R. Rohde,et al.  Land reform and the new elite: Exclusion of the poor from communal land in Namaqualand, South Africa , 2007 .

[31]  M. Ndoye,et al.  Adaptative Strategies in African Arid Lands , 1993 .

[32]  J. Hearn,et al.  The kangaroo conundrum: home range studies and implications for land management , 2005 .

[33]  Andrew Hayen,et al.  Areas of components of a Voronoi polygon in a homogeneous Poisson process in the plane , 2002, Advances in Applied Probability.

[34]  D. Elston,et al.  Home-range sizes in a stratified upland landscape of two lagomorphs with different feeding strategies , 1996 .

[35]  Philipp Berens,et al.  The Cape Herders: A History of the Khoikhoi of Southern Africa , 1998 .

[36]  M. Hoffman,et al.  The impact of livestock grazing on landscape biophysical attributes in privately and communally managed rangelands in Namaqualand , 2004 .

[37]  S. McNaughton,et al.  Ecology of a Grazing Ecosystem: The Serengeti , 1985 .