Long-term impacts of goat browsing on bush-clump dynamics in a semi-arid subtropical savanna

Plant Ecology

Volumn 183, Issue 2, 2006, Pages 277-290

  Hester, Alison J ^a,c   Scogings, Peter F ^b,c   Trollope, Winston S W ^c  

^a SCOTTISH CROP RESEARCH INSTITUTE   (United Kingdom)

^b UNIVERSITY OF ZULULAND   (South Africa)

^c UNIVERSITY OF FORT HARE   (South Africa)

Author keywords

Acacia karroo; Biological control; Species richness; Succession

Indexed keywords

AERIAL PHOTOGRAPH; BIOLOGICAL CONTROL; BROWSING; FEEDING BEHAVIOR; GOAT; SAVANNA; SEMIARID REGION; SHRUB; SPECIES RICHNESS; STOCKING DENSITY;

AFRICA; SOUTH AFRICA; SOUTHERN AFRICA; SUB-SAHARAN AFRICA;

ALOE; ALOE FEROX; CAPRA HIRCUS; CUSSONIA SPICATA; EHRETIA RIGIDA; GREWIA; GREWIA OCCIDENTALIS; JASMINUM; SENECIO;

EID: 33745014769     PISSN: 13850237     EISSN: None     Source Type: Journal    
DOI: 10.1007/s11258-005-9039-6     Document Type: Article

References (57)

1. Acocks J.P.H. 1975. Veld types of South Africa. Memoirs of the Botanical Survey of Southern Africa 40. National Botanical Institute, Pretoria.
2. Archer S. 1989. Have southern Texas savannas been converted to woodlands in recent history?. Am. Nat. 134: 545-561.
3. Archer S. 1995. Tree-grass dynamics in a Prosopis-thornscrub savanna parkland: reconstructing the past and predicting the future. Ecoscience 2: 83-99.
4. Barnes P.W. and Archer S. 1996. Influence of an overstory tree (Prosopis glandulosa) on associated shrubs in a savanna parkland: implications for patch dynamics. Oecologia 105: 493-500.
5. Barnes P.W. and Archer S. 1999. Tree-shrub interactions in a subtropical savanna parkland: competition or facilitation?. J. Veg. Sci. 10: 525-536.
6. Bell A.D. 1991. Plant Form. Oxford University Press, Oxford.
7. Bews J.W. 1917. The plant succession in the thornveld. South Afr. J. Sci. 4: 153-172.
8. Bjelland B.K. and Grova L. (1997). The feeding behaviour and diet selection of the indigenous Ciskeian goat and the improved Boer goat of South Africa. Cand. Agric. Thesis, Agricultural University of Norway.
9. Bonser S.P. and Aarssen L.W. 1996. Meristem allocation: a new classification theory for adaptive strategies in herbaceous plants. Oikos 77: 347-352.
10. ter Braak T.C.R. and Smilauer P. 2002. CANOCO for Windows Version 4.5. Copyright GLW-CPRO. CPRO, Wageningen, Netherlands.
11. Crawley M.J. and Long C.R. 1995. Alternate bearing, predator satiation and seedling recruitment in Quercus robur. J. Ecol. 83: 683-696.
12. Dziba L.E., Scogings P.F. and Raats J.G. 1999. Species selection and intake rates of Boer goats and Ciskei indigenous goats in cafeteria style experiments. In: A Land Care Issue: land use options from veld and pasture. Proceedings of the 34th Annual Congress of the Grassland Society of Southern Africa, Warmbaths, South Africa, February 1999.
13. Ekblad R.L., Stuth J.W. and Owens M.K. 1993. Grazing pressure impacts on potential foraging competition between Angora goats and white-tailed deer. Small Ruminant Res. 11: 195-208.
14. Etzenhouser M.J., Owens M.K., Spalinger D.E. and Murden S.B. 1998. Foraging behaviour of browsing ruminants in a heterogeneous landscape. Landscape Ecol. 13: 55-64.
15. Fabricius C. 1997. The Impact of Land Use On Biodiversity in Xeric Succulent Thicket, South Africa. University of Cape Town, South Africa, PhD Thesis.
16. Flinn R.C., Scifres C.J. and Archer S.R. 1992. Variation in basal sprouting in co-occurring shrubs: implications for stand dynamics. J. Veg. Sci. 3: 125-128.
17. Frost P.G.H., Medina E., Menaut J-C., Solbrig O., Swift M. and Walker B. 1986. Responses of savannas to stress and disturbance: a proprosal for a collaborative programme of research. Biol. Int., Special Issue 10: 1-82.
18. Fulbright T.E., Kuti J.O. and Tipton A.R. 1997. Effects of nurse-plant canopy light intensity on shrub seedling growth. J. Range Manage. 50: 607-610.
19. Genstat 5 Committee 1998. Genstat 5 Release 3 Reference Manual, with release 4.1 updates. Oxford University Press, Oxford.
20. Gothesen H.A. 1997. Species selection by goats on a South African savanna. Cand. Agric. Thesis, Agricultural University of Norway.
21. Herms D.A. and Mattson W.J. 1992. The dilemma of plants: To grow or defend. Q. Rev. Biol. 67: 283-335.
22. Hester A.J., Bergman M., Iason G.R. and Moen R. 2005. Impacts of large herbivores on plant community structure and dynamics. In: Danell K., Bergström R., Duncan P. and Pastor J. (eds), Large Herbivore Ecology and Ecosystem Dynamics. Cambridge University Press (in press).
23. Jarvel L.C. 1996. Bushclump-grass interactions in a south-east African savanna: Processes and responses to bush control. University of Natal, South Africa, MSc Thesis.
24. Justice C., Scholes R.J. and Frost P.G.H. (eds), 1994. African Savannas and the Global Atmosphere. IGBP, Stockholm.
25. Kerley G.I.H., Knight M.H. and de Kock M. 1995. Desertification of subtropical thicket in the Eastern Cape, South Africa: are there alternatives?. Environ. Monit. Assess. 37: 211-230.
26. Larcher W. 1995. Physiological Plant Ecology. Springer, New York.
27. Lenzi-Grillini C.R., Viskanic P. and Mapesa M. 1996. Effects of 20 years of grazing exclusion in an area of the Queen Elizabeth National Park, Uganda. Afr. J. Ecol. 34: 333-341.
28. Lubke R.A., Everard D.A. and Jackson S. 1986. The biomes of the Eastern Cape with emphasis on their conservation. Bothalia 16: 251-261.
29. Milewski A.V., Young T.P. and Madden D. 1991. Thorns as induced defences: experimental evidence. Oecologia 86: 70-75.
30. Mogorosi C.K., Segoale N., Ngwazi F.N., Mahlangu J.P., Mafu J.V., Mgxashe N.P., Pepe D. and Webber L.N. 1996. Harvesting rate of different bush species by goats. Bull. Grassland Soc. South Afr. 7: 72-73.
31. Northup B.K., Stuth J.W., Archer S., McKown D. and Crane R.A. 1996. Structure of shrub clusters in a subtropical savanna in south Texas. In: West N.E. (ed.), Rangelands in a Sustainable Biosphere, Vol. 1. Society for Range Management, Denver, pp. 401-402.
32. Norton D.A. 1995. Vegetation on goat-free islands in a low-alpine lake, Paparoa Range, and implications for monitoring goat control operations. New Zeal. J. Ecol. 19: 67-72.
33. O'Connor T.G. 1996. Individual, population and community response of woody plants to browsing in African savannas. Bull. Grassland Soc. Southern Afr. 7(Supplement 1): 14-18.
34. Parkes J.P. 1994. Feral goats: Designing solutions for a designer pest. New Zeal. J. Ecol. 17: 71-83.
35. Reid R.S. and Ellis J.E. 1995. Impacts of pastoralists on woodlands in South Turkana, Kenya: livestock-mediated tree recruitment. Ecol. Appl. 5: 978-992.
36. Scholes R.J. 1997. Savanna. In: Cowling R.M., Richardson D.M. and Pierce S.M. (eds), Vegetation of Southern Africa, Cambridge University Press, Cambridge, pp. 258-277.
37. Scholes R.J. and Archer S.R. 1997. Tree-grass interactions in savannas. Annu. Rev. Ecol. Syst. 28: 517-544.
38. Scholes R.J. and Walker B.H. 1993. An African Savanna. Cambridge University Press, Cambridge.
39. Schurr F.M., Bossdorf O., Milton S.J. and Schumacher J. (2004) Spatial pattern formation in semi-arid shrubland: a priori predicted vs. observed pattern characteristics. Plant Ecol. 173:271-282.
40. Scogings P.F., Trollope W.S.W. and O'Connor T. 1996. The impact of browsing and burning on savanna vegetation. In: West N.E. (ed.), Rangelands in a Sustainable Biosphere, Society for Range Management, Denver, USA.
41. Scogings P.F. 1998a. Resistance of six savanna woody plant species to browsing by goats in the Eastern Cape Province of South Africa. University of Fort Hare, Alice, PhD Thesis.
42. Scogings P.F. 1998b. Impacts of browsing woody plants in African savannas. In: Webb, E.C. and Cronjé, P.B. (eds), Research and Training Strategies for Goat Production Systems in South Africa. Department of Animal and Wildlife Sciences, University of Pretoria.
43. Scogings P.F., Dziba L.E. and Gordon I.J. 2004. Leaf chemistry of woody plants in relation to season, canopy retention and goat browsing in a semi-arid subtropical savanna. Austral Ecol. 29: 278-286.
44. Skarpe C. 1992. Dynamics of savanna ecosystems. J. Veg. Sci. 3: 293-300.
45. Smith T.M. and Goodman P.S. 1987. Successional dynamics in an Acacia nilotica-Euclea divinorum savanna in southern Africa. J. Ecol. 75: 603-610.
46. Strauss S.Y. and Agrawal A.A. 1999. The ecology and evolution of plant tolerance to herbivory. Trend. Ecol. Evol. 14: 179-185.
47. Teague W.R. 1989a. Monitoring vegetation in thorn/grass communities. In: Danckwerts J.E. and Teague W.R. (eds), Veld Management in the Eastern Cape, Department of Agriculture and Water Supply, Pretoria, pp. 99-102.
48. Teague W.R. 1989b. Grass/Bush communities. In: Danckwerts J.E. and Teague W.R. (eds), Veld Management in the Eastern Cape, Department of Agriculture and Water Supply, Pretoria, pp. 155-165.
49. Teague W.R., Trollope W.S.W. and Aucamp A.J. 1981. Veld management in the semi-arid bush-grass communities of the Eastern Cape. Proc. Grassland Soc. Southern Afr. 16: 23-28.
50. Trollope W.S.W. 1976. Veld rehabilitation in the Ciskei. Fort Hare Papers 6: 208-217.
51. Trollope W.S.W., Hobson F.O., Danckwerts J.E. and van Niekerk J.P. 1989. Encroachment and control of undesirable plants. In: Danckwerts J.E. and Teague W.R. (eds), Veld Management in the Eastern Cape, Department of Agriculture and Water Supply, Pretoria, pp. 73-89.
52. Urton N. and Page D. 1993. Plants of the Swartkops Valley Bushveld. Zwartkops Trust, Grahamstown.
53. Walker B.H. 1985. Structure and function of savannas: An overview. In: Tothill J.C. and Mott J.J. (eds), Ecology and Management of the World's Savannas, Australian Academy of Science, Canberra, and CAB, Farnham Royal, pp. 83-91.
54. Weber G.E., Jeltsch F., van Rooyen N. and Milton S.J. 1998. Simulated long term vegetation response to grazing heterogeneity in semi-arid rangelands. J. Appl. Ecol. 35: 687-699.
55. Werner P.A., Walker B.H. and Stott P.A. 1990. Introduction. J. Biogeogr. 17: 343-344.
56. Van Wyk B. and van Wyk P. 1997. Field Guide to Trees of Southern Africa. Struik Publishers LTD, Cape Town.
57. Young T.P. and Okello B.D. 1998. Relaxation of an induced defence after exclusion of herbivores: spines on Acacia drepanolobium. Oecologia 111: 508-513.