Vegetation change in semiarid communities: Simulating probabilities and time scales

Vegetatio

Volumn 125, Issue 2, 1996, Pages 169-183

  Wiegand, T ^a   Milton, S J ^b  

^a HELMHOLTZ CENTRE FOR ENVIRONMENTAL RESEARCH UFZ   (Germany)

^b UNIVERSITY OF CAPE TOWN   (South Africa)

Author keywords

Event driven dynamics; Grazing; Grid based model; Individual based simulation model; Karoo

Indexed keywords

ANIMALIA; EQUIDAE;

LIFE HISTORY; OVERGRAZING; PLANT COMMUNITY; RAINFALL; RANGELAND; SEMI-ARID VEGETATION;

SOUTH AFRICA, KAROO;

EID: 0029663747     PISSN: 00423106     EISSN: None     Source Type: Journal    
DOI: 10.1007/BF00044649     Document Type: Article

References (62)

1. Austin, M. P. & Williams, O. 1988. Influence of climate and community composition on the population demography of pasture species in semiarid Australia. Vegetatio 77: 43-49.
2. Bahre, C. J. 1991. A legacy of change - historic human impact on vegetation of the Arizona borderlands. The University of Arizona Press, Tucson, Arizona, USA.
3. Bond W. J. 1994. Do mutualisms matter? Assessing the impact of pollinator and disperser disruption on plant extinction. Philosophical Transactions of the Royal Society of London B344: 83-90.
4. Caswell, H. & Etter, J. 1993. Ecological interactions in patchy environments: from patch-occupancy modells to cellular automata. In: Levin, S. A., Powell, T. M. & Steele, J. H. (eds). Patch dynamics, pp. 93-109. Springer Verlag, Berlin.
5. Clements, F. E. 1916. Plant succession: an analysis of the development of vegetation. Carnegie Institute Publication 242: 1-512, Washington DC, USA.
6. Cody, M.L. 1993. Do cholla cacti (Opuntia spp., subgenus Cylindropuntia) use or need plants in the Mojave desert? J. Arid Environ. 24: 139-154.
7. Coffin, D. P. & Lauenroth, W. K. 1990. A gap dynamics simulation model of succession in a semiarid grassland. Ecological Modelling 49: 229-266.
8. Cowling, R. M, Esler, K. J., Midgley, G. F. & Honig, M. A. 1994. Plant functional diversity, species diversity and climate in arid and semi-arid southern Africa. J. Arid Environ. 27: 141-158.
9. Crisp, M. D. 1978. Demography and survival under grazing of three C semi-desert shrubs. Oikos 30: 520-528.
10. Danckwerts, J. E. & Stuart-Hill, G. C. 1988. The effect of severe drought and management after drought on mortality and recovery of semi-arid grassland. J. Grassl. Soc. South Africa 5(4): 218-222.
11. Dean, W. R. J. & Macdonald, I. A. W. 1994. Historical changes in stocking rates of domestic livestock as a measure of semi-arid and arid rangeland degradation in the Cape Province, South Africa. J. Arid Environ. 26(3): 281-198.
12. Eldridge, D. J. & Westoby, M. 1991. Recruitment and survival in Atriplex vesicaria populations in semi-arid western New South Wales, 1977-87. Austr. J. Ecol. 16: 309-314.
13. Esler, K. J. 1993. Vegetation patterns and plant reproductive processes. Ph.D. thesis, University of Cape Town, South Africa.
14. Friedel, M. H. 1991. Range condition assessment and the concepts of thresholds: A viewpoint. J. Range Manage. 44: 422-426.
15. Friedel, M. H., Foran, D. B. & Stafford Smith D. M. 1990. Where creeks run dry or ten feet high: pastoral management in arid Australia. Proc. Ecol. Soc. Australia 16: 185-194.
16. George, M. R., Brown, J. R. & Clawson, W. J. 1992. Application of non-equilibrium ecology to management of Mediterranean grasslands. J. Range Manage. 45: 436-440.
17. Griffin, G. F. & Friedel, M. H. 1985. Discontinuous change in central Australia: some implications of major ecological events for land management. J. Arid Environ. 9: 63-80.
18. Harrington, G. N., Wilson, A. D. & Young, M. D. 1984. Management of Rangeland Ecosystems. In: Harrington, G. N., Wilson, A. D. & Young, M. D. (eds), Management of Australia's Rangelands. Pp. 3-13. CSIRO, Melbourne.
19. Hoffman, M. T., Barr, G. D. & Cowling, R. M. 1990. Vegetation dynamics in the semi-arid Karoo, South Africa: The effect of seasonal rainfall and competition on grass and shrub basal cover. S. Afr. J. Sci. 86: 462-463.
20. Hogeweg, P. 1988. Cellular automata as a paradigm for ecological modeling. Applied Mathematics and Computation 27: 81-100.
21. Jeltsch, F. & Wissel, C. 1994. Modelling dieback phenomena in natural forests. Ecological Modelling 75/76: 111-121.
22. Jeltsch, F., Milton S. J., Dean. W. R. J. & van Royen, N. Tree spacing and coexistence in semi-arid savannas. J. Ecol. (in press).
23. Lavorel, S., O'Neill, R. V. & Gardner, R. H. 1994. Spatio-temporal dispersal strategies and annual plant species coexistence in a structured landscape. Oikos 71: 75-88.
24. Le Houerou, H. N. 1989. The grazing land ecosystems of the African Sahel. Springer-Verlag, New York.
25. Louw, G. N. & Seely, M. K. 1982. Ecology of Desert Organisms. Longman, Essex.
26. MacMahon, J. A. & Wagner, F. H. 1985. The Mojave, Sonoran and Chihuahuan deserts of North America. Pp. 105-202. In: Evenari, M., Noy-Meir, I. & Goodall, D. W. (eds). Hot deserts and Arid Shrublands. Elsevier Science Publishers, Amsterdam.
27. McAuliffe J. R. 1988. Markovian dynamics of simple and complex desert plant communities. Am. Nat. 131: 459-490.
28. Milton, S. J. 1992. Effects of rainfall, competition and grazing of flowering of Osteospermum sinuatum (Asteraceae) in arid Karoo Rangeland. J. Grassl. Soc. South Afr. 9: 158-164.
29. Milton, S. J. 1994. Growth, flowering and recruitment of shrubs in grazed and in protected rangeland in the arid Karoo, South Africa. Vegetatio 111: 17-27.
30. Milton, S. J. 1995. Spatial and temporal patterns in the emergence and survival of seedlings in arid Karoo shrubland. J. Appl. Ecol. 32: 145-156.
31. Milton, S. J. & Dean, W. R. J. 1990. Seed production in rangelands of the southern Karoo. S. Afr. J. Sci. 86: 231-233.
32. Milton, S. J. & Dean, W. R. J. 1993. Selection of seeds by harvester ants (Messor capensis) in relation to condition of arid rangeland. J. Arid Environ. 24: 63-74.
33. Milton, S. J. & Hoffman, M. T. 1994. The application of state-and-transition models to rangeland research and management in arid succulent and semi-arid grassy Karoo, South Africa. Afr. J. Range For. Sci. 11: 18-26.
34. Milton, S. J., Dean, W. R. J. & Kerley, G. I. H. 1992. Tierberg Karoo Research Centre: history, physical environment, flora and fauna. Trans. Roy. Soc. S. Afr. 48: 15-46.
35. Milton, S. J., Dean, W. R. J., du Plessis, M. A. & Siegfried, W. R. 1994. A conceptual model of arid rangeland degradation - the escalating cost of declining productivity. BioScience 44: 70-76.
36. Milton, S. J., Dean, W. R. J., Marincowitz, C. P. & Kerley, G. I. H. 1995. Effects of the 1990/91 drought on rangeland in the Steytlerville Karoo. S. Afr. J. Sci. 91: 78-84.
37. Montaña , C. 1992. The colonization of bare areas in a two-phase mosaic of an arid ecosystem. J. Ecol. 80: 315-327.
38. Moore, A. 1989. Die ekologie en ekofisiologie van Rhigozum trichotomum. PhD thesis, University of Port Elizabeth, South Africa.
39. Moloney, K. A. & Levin, S. A. 1996. The effects of disturbance architecture on landscape level population dynamics. Ecology 77: 375-394.
40. O'Connor, T. G. O. 1991. Local extinction in perennial grasslands: a life-history approach. Am. Nat. 137: 753-773.
41. Perkins, J. S. & Thomas, D. S. G. 1993. Environmental responses and sensitivity to permanent cattle ranching, semi-arid western central Botswana. In: Thomas D. S. G. & Allison, R. J. (eds), Landscape Sensitivity. Pp. 273-286. New York, Wiley and Sons.
42. Schlesinger, W. H., Reynolds, J. F., Cunningham, G. L., Huenneke, L. F., Jarrell, W. M., Virginia, R. A. & Whitford, W. G. 1990. Biological feedbacks in global desertification. Science 247: 1043-1048.
43. Schofield, C. J. & Bucher, E. H. 1986. Industrial contributions to desertification in South America. Trends. Ecol. Evol. 1: 78-80.
44. Scholes, R. J. 1990. Change in nature and the nature of change: interactions between terrestrial ecosystems and the atmosphere. S. Afr. J. Sci. 86: 350-354.
45. Seastedt, T. R., Ramundo, R. A. & Hayes, D. C. 1988. Maximization of soil animals by foliage herbivory: empirical evidence, graphical and conceptual models. Oikos 51: 243-248.
46. Silvertown, J., Holtier, S., Johnson, J. & Dale, P. 1992. Cellular automata models of interspecific competition for space - the effect of pattern and progress. J. Ecol. 80: 527-534.
47. Skarpe, C. 1991. Impact of grazing in savanna ecosystems. Ambio 20: 351-356.
48. Smith, E. L. 1988. Successional concepts in relation to range condition assessment. In: Tueller, P. T. (ed.), Vegetation Science Applications for Rangeland Analysis and Management. Pp. 113-134. Kluwer Academic Publishers, Dordrecht, The Netherlands.
49. Turner, R. M. 1990. Long-term vegetation change at a fully protected Sonoran desert site. Ecology 71: 464-477.
50. Tyson P.D. 1986. Climatic change and variability in Southern Africa. Oxford Press, Cape Town.
51. Vorster, M. 1985. Die ordening van die landtipes in die Karoostreek in redelike homogene boerderygebiede deur middel van plantegroei- en omgewings faktore. D.Sc. thesis, Potchefstroom University, South Africa.
52. Walker, B. H. 1993. Rangeland Ecology: Understanding and Managing Change. Ambio 22: 80-87.
53. West, N. E. 1993. Biodiversity of rangelands. J. Range Manage. 46: 2-13.
54. Westoby, M., Walker, B. M. & Noy-Meir, I. 1989. Opportunistic management for rangelands not at equilibrium. J. Range Manage. 42: 266-274.
55. Wiegand, T., Milton, S. J. & Wissel, C. 1995. A simulation model for a shrub-ecosystem in the semi-arid Karoo, South Africa. Ecology 76: 2205-2221.
56. Wiegand, T. & Milton, S. J. A simulation model for shrubland ecosystem dynamics in arid Karoo, South Africa. In: Barrow, J. R., McArthur, E. D., Sosebee, R. E. & Tausch, R. J. (eds), Proceedings: shrubland ecosystem dynamics in a changing environment. U.S. Department of Agriculture, Forest Service, Intermoutain Research Station (in press).
57. Wissel, C. 1992. Modelling the mosaic cycle of a Middle European beech forest. Ecological Modelling 63: 29-43.
58. Williams, O. B. & Roe, R. 1975. Management of arid grasslands for sheep: plant demography of six grasses in relation to climate and grazing. Proc. Ecol. Soc. Australia 9: 142-156.
59. Wilson, A. D. & Hodgkinson, K. C. 1991. The response of grasses to grazing and its implications for the management of native grasslands. In: Garden, D. & Dowling, P. (eds). Proceedings of a Workshop on Australian Native Grasses. Pp. 47-59. C Wool Corporation, Melbourne, Australia.
60. Wolfram, S. 1986. Theory and application of cellular automata. World Science Publications, Singapore, Malaysia.
61. Yeaton, R. I., and K. J. Esler. 1990. The dynamics of a succulent Karoo vegetation. A study of species association and recruitment. Vegetatio 88: 103-113.
62. Zucchini, W., Adamson, P. & McNeill, L. 1992. A model of southern African rainfall. S. Afr. J. Sci. 88: 103-109.