Effects of excluding goat herbivory on Acacia tortilis woodland around pastoralist settlements in northwest Kenya

Acta Oecologica

Volumn 19, Issue 4, 1998, Pages 395-404

  Oba, Gufu ^a  

^a UNIVERSITY OF OSLO   (Norway)

Author keywords

Acacia tortills; Arid zones; Browse production; Goat herbivory; Pastoralists; Relative growth rates

Indexed keywords

EXCLUSION EXPERIMENT; HERBIVORY; REGENERATION; TREE; UNGULATE;

KENYA;

ACACIA TORTILIS; CAPRA HIRCUS;

EID: 0032123483     PISSN: 1146609X     EISSN: None     Source Type: Journal    
DOI: 10.1016/S1146-609X(98)80044-1     Document Type: Article

References (39)

1. [1] Amuyunzu C.L., Vegetation resources of central Turkana district, Kenya, Tremu Technical Report D-2, Unesco, Nairobi, 1988.
2. [2] Atsedu M., Coppock D.L., Detling J.K., Fruit production of Acacia tortilis and A. nilotica in semi-arid Ethiopia, Agroforest. Syst. 27 (1994) 23-30.
3. [3] Bergstrom R., Browse characteristics and impact of browsing on trees and shrubs in African savannas, J. Veg. Sci. 1 (1992) 419-424.
4. [4] Cooper S.M., Owen-Smith N., Effects of plant spinescence on large mammalian herbivores, Oecologia 68 (1986) 446-455.
5. [5] Coughenour M.B., Ellis J.E., Swift D.M., Coppock D.L., Galvin K., McCabe J.T., Hart T.C., Energy extraction and use in a nomadic pastoral ecosystem, Science 230 (1985) 619-625.
6. [6] Coughenour M.B., Ellis J.E., Popp R.G., Morphometric relationships and developmental patterns of Acacia tortilis and Acacia reficiens in southern Turkana, Kenya, Bull. Torrey Bot. Club 117 (1990) 8-17.
7. [7] Crawley M.J., Herbivory: the dynamics of animal plant integrated, University of California, 1983.
8. [8] Du Toit J.T., Giraffe feeding on Acacia flowers: predation or pollination? Afr. J. Ecol. 28 (1990) 63-68.
9. [9] Du Toit J.T., Bryant J.P., Frisby K., Regrowth and palatability of Acacia shoots following pruning by African savannah browsers, Ecology 71 (1990) 149-154.
10. [10] Ecosystems Ltd, Turkana rehabilitation project: Turkana District resource survey 1982-1984: main report, Ecosystems Ltd, Ministry of Energy & Regional Development, Nairobi, Kenya, 1985.
11. [11] Ellis J.E., Swift D.M., Stability of African pastoral system: alternate paradigms and implications for development, J. Range Manag. 41 (1988) 450-459.
12. [12] Haro G.O., Oba G., Dynamics of Acacia tortilis litter in the Turkwel River floodplain woodlands, Kenya, Afr. J. Ecol. 31 (1993) 200-209.
13. [13] Hunt R., Plant growth curves: the functional approach to plant growth analysis, Edward Arnold, London, 1982.
14. [14] Lamprey H.F., IPAL woodland ecology program: summarized account, IPAL Technical Report No. A-5, Unesco, Nairobi, 1981, pp. 280-318.
15. [15] Lamprey H.F., Yussuf H., Pastoralism and desert encroachment in northern Kenya, Ambio 10 (1981) 131-134.
16. [16] Lamprey H.F., Halevy G., Makacha S., Interactions between Acacia, bruchid beetles and large herbivores, East Afr. Wildlife J. 12 (1974) 81-85.
17. [17] Leithead H.L., Measuring the growth of trees, Rangelands 1 (1979) 29-30.
18. [18] Malechek J.C., Provenza F.D., Feeding behaviour and nutrition of goats on rangelands, World Anim. Rev. 47 (1983) 38-48.
19. [19] Martin A.A.J., Huss D.L., Goats much maligned but necessary, Rangelands 3 (1981) 199-201.
20. [20] McNaughton S.J., Compensatory plant growth as a response to herbivory, Oikos 40 (1983) 329-336.
21. [21] McNaughton S.J., Ruess R.W., Seagle S.W., Large mammals and process dynamics in African ecosystems, Bioscience 38 (1988) 794-800.
22. [22] Mwalyosi R.B.B., The dynamic ecology of Acacia tortilis woodland in Lake Manyara National Park, Tanzania, Afr. J. Ecol. 28 (1990) 189-199.
23. [23] Owens M.K., Utilization patteras by angora goats within the plant canopies of two Acacia shrubs, J. Range Manag. 44 (1991) 456-460.
24. [24] Pellew R.A.P., The production and consumption of Acacia browse and its potential for animal protein production, in: Le Houe'rou H.N. (Ed.), Browse in Africa: the current state of knowledge, ILCA Addis Ababa, Ethiopia, 1980.
25. [25] Pellew R.A.P., The giraffe and its food resource in the Serengeti: composition, biomass and production of available browse, Afr. J. Ecol. 21 (1983) 241-267.
26. [26] Pellew R.A.P., The impacts of elephant, giraffe and fire upon the Acacia tortilis woodlands of the Serengeti, Afr. J. Ecol. 21 (1983) 41-74.
27. [27] Pfister J.A., Malechek J.C., Balph D.F., Foraging behaviour of goats and sheep in the Caatinga of Brazil, J. Appl. Ecol. 25 (1988) 379-388.
28. [28] Pratt D.J., Gwynne M.D., Rangeland management and ecology in East Africa, Hodder and Stoughton, London, 1977.
29. [29] Reid R.S., Ellis J.E., Impacts of pastoralists on woodlands in southern Turkana, Kenya: livestock-mediated tree recruitment, Ecol. Appl. 5 (1995) 978-992.
30. [30] Ruess R.W., Halter F.L., The impact of large herbivores on the Serona woodlands, Serengeti National Park, Tanzania, Afr. J. Ecol. 28 (1990) 259-275.
31. [31] Skarpe C., Shrub layer dynamics under different herbivore densities in an arid savannah, Botswana, J. Appl. Ecol. 27 (1990) 873-885.
32. [32] Staples R.R., Hornby H.E., Hornby R.M., A study of the comparative effects of goats and cattle on a mixed grass bush pasture, East Afr. Agr. Forest. J. 8 (1942) 62-70.
33. [33] Statistical Graphics Corporation, STCS Inc., STATGRAPHICS version 5.0, USA, 1991.
34. [34] Stuart-Hill G.C., Effects of elephants and goats on the Kaffrarian succulent thicket of the eastern Cape, South Africa, J. Appl. Ecol. 29 (1992) 699-710.
35. [35] Van Bremen H., Kinyanjui H.C.K., Soils of the Lodwar area (quarter degree sheets, 24, 25 & parts of 26, 38, 39, & 40): an inventory of soils, an evaluation of present land use and recommendation for future land use. Reconnaissance Soil survey report. No. R17, Kenya Soil Survey, Nairobi, 1992.
36. [36] Van der Meijden E., Wijn M., Verkaar H.J., Defence and regrowth alternative strategies in the struggle against herbivores, Oikos 51 (1988) 355-363.
37. [37] Vesey-Fitzgerald D.F., Animal impact on vegetation and plant succession in Lake Manyara National Park, Tanzania, Oikos 24 (1972) 314-325.
38. [38] Vivas H.J., Saether B.E., Andersen R., Optimal twig-size selection of a generalist herbivore, the moose Alces Alces: implications for plant-herbivore interactions, J. Anim. Ecol. 60 (1991) 395-408.
39. [39] Young T.P., Increased thorn length in Acacia depranolobium -an induced response to browsing, Oecologia 71 (1987) 436-438.