Tree spacing and coexistence in semiarid savannas

Journal of Ecology

Volumn 84, Issue 4, 1996, Pages 583-595

  Jeltsch, Florian ^a   Milton, Suzanne J ^b   Dean, W R J ^b   Van Rooyen, Noel ^c  

^a HELMHOLTZ CENTRE FOR ENVIRONMENTAL RESEARCH UFZ   (Germany)

^b UNIVERSITY OF CAPE TOWN   (South Africa)

^c UNIVERSITY OF PRETORIA   (South Africa)

Author keywords

Cellular automaton model; Coexistence; Large scale disturbances; Pattern formation; Savanna

Indexed keywords

CELLULAR AUTOMATON MODEL; COEXISTENCE; FIRE; GRAZING; RAINFALL; SAVANNA; TREE SPACING;

POACEAE;

EID: 0030304882     PISSN: 00220477     EISSN: None     Source Type: Journal    
DOI: 10.2307/2261480     Document Type: Article

References (55)

1. Archer, S., Scifres, C., Bassham, C.R. &. Maggio, R. (1988) Autogenic succession in a subtropical savanna. conversion of grassland to thorn woodland. Ecological Monographs, 58, 111-127.
2. Belsky, A.J. (1990) Tree/grass ratios in East African savannas: a comparison of existing models. Journal of Biogeography, 17, 483-489.
3. Belsky, A.J. (1994) Influences of trees on savanna productivity: tests of shade, nutrients, and tree-grass competition. Ecology, 75, 922-932.
4. Belsky, A.J., Amundson, R.G., Duxbury, J.M., Riha, S.J., Ali, A.R. & Mongwa, S.M. (1989) The effect of trees on their physical, chemical and biological environment in a semiarid savanna in Kenya. Journal of Applied Ecology, 26, 1005-1024.
5. Bews, J.W. (1917) The plant succession in the thorn veld. South African Association for the Advancement of Science, 7, 121.
6. Brown, J.H., Davidson, D.W., Munger, J.C. & Inouye, R.C. (1986) Experimental community ecology. The Desert Granivore System (eds J. L. Diamond & T. J. Case), pp. 41-61. Community Ecology. Harper and Row, New York.
7. Bucher, E.H. (1982) Chaco and Caatinga - South American arid savannas, woodlands and thickets. Ecology of Tropical Savannas (eds B. J. Huntley & B. H. Walker), pp.48-79. Ecological Studies 42. Springer, Berlin.
8. Cox, J.R., de Alba-Avila, A., Rice, R. & Cox, J.N (1993) Biological and physical factors influencing Acacia constricta and Prosopis velutina establishment in the Sonoran Desert. Journal of Range Management, 46, 43-48.
9. Eagleson, P.S. & Segarra, R.I. (1985) Water-limited equi-librium of savanna vegetation systems. Water Resource Research, 21, 1483-1493.
10. Frost, P.G.H. & Robertson, F. (1987) The ecological effect of fire in savannas. Determinants of Tropical Savannas (ed. B. H. Walker), pp. 93-140. ICSU Press, Miami.
11. Hochberg, M E., Menault, J.C. & Gignoux, J. (1994) The influences of tree biology and fire in the spatial structure of the West African savannah. Journal of Ecology, 82, 217-226.
12. Hoffman, M.T., Cowling, R.M., Douie, C. & Pierce, S.M. (1989) Seed predation and germination of Acacia erioloba in the Kuiseb River valley, Namib Desert. South African Journal of Botany, 55, 103-106.
13. Jeltsch, F. & Wissel, C. (1993) Modelling factors which may cause Standlevel dieback in forests. Forest Decline in the Atlantic and Pacific Region (eds R. F. Huettl & D. Mueller-Dombois). pp. 251-260. Springer, Berlin.
14. Jeltsch, F. & Wissel, C. (1994) Modelling dieback phenomena in natural forests. Ecological Modelling, 75/76, 111-121.
15. Leistner, O.A. (1961) On the dispersal of Acacia giraffae by game. Koedoe, 4, 101-104.
16. Leistner, O.A. (1967) The plant ecology of the southern Kalahari. Memoirs of the Botanical Society of South Africa, 38, 11-73.
17. Levin, S.A. (1992) The problem of pattern and scale in ecology. Ecology, 73, 1943-1967.
18. Maclean, G.L. (1993) Robert's Birds of southern Africa, 6th edn. John Voelcker Bird Book Fund, Cape Town.
19. Menaut, J.C., Gignoux, J., Prado, C & Clobert, J (1990) Tree community dynamics in a humid savanna of the Côte-d'Ivoire: modelling the effects of fire and competition with grass and neighbours. Journal of Biogeography, 17, 471-481.
20. Miller, M.F. (1994) The costs and benefits of Acacia seed consumption by ungulates. Oikos, 71, 181-187.
21. Milton, S.J. & Dean, W.R.J. (1995) How useful is the keystone species concept, and can it be applied to Acacia erioloba in the Kalahari desert? Zeitschrift für Ökologie und Naturschutz, 4, 147-156
22. Moore, A., Van Eck, J.A.J., Van Niekerk, J.P. & Robertson, B.L. (1988) Evapotranspiration in three plant communities of a Rhigozum trichotomum habitat at Upington. Journal of the Grassland Society of South Africa, 5, 80-84.
23. Moore, A (1989) Die ekologie en ek ofisiologie ran Rhigozum trichotomum. PhD thesis. University of Port Elizabeth, South Africa.
24. Nel, J.A.J. (1967) Burrow systems of Desmodillus auricularis in the Kalahari Gemsbok National Park. Koedoe, 10, 118-121.
25. Noy-Meir, I. (1973) Desert ecosystems: environment and producers. Annual Reviews of Ecology and Systemmatics, 4, 25-51.
26. O'Connor, T.G. (1985) A synthesis of field experiments concerning the grass layer in the savanna regions of southern Africa. South African National Scientific Programs Report no. 114, Pretoria.
27. Peláez, D.V., Boo, R.M. & Elia, O.R (1992) Emergence and seedling survival of calden in the semiarid region of Argentina. Journal of Range Management, 45, 564-568.
28. Perkins, J.S. & Thomas, D.S G. (1993) Spreading deserts of spatially confined environmental impacts - land degradation and cattle ranching in the Kalahari desert of Botswana. Land Degradation and Rehabilitation, 4, 179-194.
29. Pianka, E.R. & Huey, R.B. (1971) Bird species density in the Kalahari and the Australian deserts. Koedoe, 14, 123-129.
30. Sánchez-Bayo, F. & King, G.W. (1994) Ecological factors affecting the early development of seedlings of three Acacia species from Ethiopia. South African Journal of Plant Soil, 11, 147-149.
31. Scholes, R.J. & Walker, B.H (1993) An African Savanna Synthesis of the Nylsvley Study. Cambridge University Press, Cambridge.
32. Silvertown, J. (1987) Introduction to Plant Population Ecology, 2nd edn. Longman, Essex.
33. Silvertown, J , Holder, S., Johnson, J. & Dale, P. (1992) Cellular automaton models of interspecific competition for space - the effect of pattern on process. Journal of Ecology, 80, 527-534
34. Skarpe, C (1991) Spatial patterns and dynamics of woody vegetation in an arid savanna. Journal of Vegetation Science, 2, 565-572.
35. Skarpe, C. (1992) Dynamics of savanna ecosystems. Journal of Vegetarian Science, 3, 293-300.
36. Smithers, R.H.N. (1983) The Mammals of the Southern African Subregion. University of Pretoria, Pretoria, South Africa.
37. Stafford Smith, D.M & Morton, S.R. (1990) A framework for the ecology of Arid Australia. Journal of arid Environments, 18, 255-278.
38. Starfield, A.M., Shapiro, S.M, Furniss, P.R., Sears, M., Retief, P.F., van der Walt, P.T. & Mills, M.G.L. (1982) A developing computer model of the Auob river ecosystem, Kalahari Gemsbok National Park. Ecology of tropical savannas (eds B. J. Huntley & B. H. Walker), pp. 610-625 Ecological Studies 42. Springer, Berlin.
39. Tainton, N.M. & Walker, B.H. (1992) Grasslands of southern Africa. Ecosystems of the World, Vol. 8B. Natural Grasslands: Eastern Hemisphere (ed. R. T. Coupland), pp. 265-290. Elsevier, Amsterdam.
40. Tietema, T., Tolsma, D.J, Veenendaal, E.M. & Schroten, J. (1991) Plant responses to human activities in the tropical savanna ecosystem of Botswana. Ecological Response to Environmental Stresses (eds J. Rozema & J. A C. Verkleij), pp. 262-276. Kluwer Academic Publishers, Dordrecht.
41. Tolsma, D.J., Ernst, W.H.O. & Verwey, R.A. (1987) Nutrients in soil and vegetation around two artificial waterpoints in Eastern Botswana Journal of Applied Ecology, 24, 991-1000.
42. Tybirk, K. (1993) Pollination, breeding system and seed abortion in some African acacias. Botanical Journal of the Linnean Society, 112, 107-137.
43. Tybirk, K., Schmidt, L.H. & Hauser, T. (1994) Notes on soil seed banks of African acacias. African Journal of Ecology, 32, 327-330.
44. VanRooyen, N., Theron, G.K. & Bredenkamp, G.J. (1991a) Long term vegetation dynamics in the semi-arid Kalahari. Koedoe, 34, 91-92.
45. Van Rooyen, N., Bredenkamp, G.J. & Theron, G.K. (1991b) Kalahari vegetation: veld condition trends and ecological status of species. Koedoe, 34, 61-72.
46. Walker, B.H. (1985) Structure and function of savannas: an overview. Ecology and Management of the World's Savannas (ed. J. C. Tothill & J. J. Mott), pp. 83-91.
47. Australian Academy of Science, Canberra. Walker, B.H., Ludwig, D., Holling, C.S. & Peterman, R.M. (1981) Stability of semi-arid savanna grazing systems. Journal of Ecology, 69, 473 498.
48. Walker, B.H. & Noy-Meir, I. (1982) Aspects of stability and resilience of savanna ecosystems. Ecology of Tropical Savannas (eds B. J. Huntley & B. H. Walker), pp. 143-155. Ecological Studies 42. Springer, Berlin.
49. Walter, H. (1971) Ecology of Tropical and Subtropical Vegetation. Oliver and Boyd, Edinburgh, UK.
50. Ward, J.D. & Breen, C.M. (1983) Drought stress and the demise of Acacia albida along the Lower Kuiseb River, central Namib Desert: preliminary findings. South African Journal of Science, 79, 444-447.
51. 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.
52. Williams, O.B. & Calaby, J.H. (1985) The hot deserts of Australia. Ecosystems of the World, Vol. 12A, Hot Deserts and Arid Shrublands (eds M. Evenari, I. Noy-Meir & D. W. Goodall), pp. 269-317 Elsevier, Amsterdam.
53. Wissel, C. & Jeltsch, F. (1993) Modelling pattern formation in ecological systems. Interdisciplinary Approaches in Nonlinear Complex Systems (eds A. Mikhailov & H. Haken), pp. 176-188. Springer-Verlag, Berlin.
54. Wolfram, S. (1986) Theory and Applications of Cellular Automata. World Science Publishers, Singapore.
55. Yeaton, R.I. (1988) Porcupines, fires and the dynamics of the tree layer of the Burkea africana savanna. Journal of Ecology, 76, 1017-1029.