Positive and negative effects of grass, cattle, and wild herbivores on Acacia saplings in an East African savanna

Oecologia

Volumn 153, Issue 4, 2007, Pages 985-995

  Riginos, Corinna ^a,b   Young, Truman P ^a,b  

^a UNIVERSITY OF CALIFORNIA   (United States)

^b MPALA RESEARCH CENTRE   (Kenya)

Author keywords

Acacia drepanolobium; Competition; Positive interactions; Tree grass interactions; Woody encroachment

Indexed keywords

CATTLE; COLONIZATION; HERBIVORE; INTERSPECIFIC COMPETITION; LEGUME; SAPLING; SAVANNA;

ACACIA; ANIMAL; ANT; ARTICLE; CATTLE; ECOSYSTEM; FEEDING BEHAVIOR; GROWTH, DEVELOPMENT AND AGING; KENYA; PHYSIOLOGY; PLANT STEM; POACEAE; SYMBIOSIS; WILD ANIMAL;

ACACIA; ANIMALS; ANIMALS, WILD; ANTS; CATTLE; ECOSYSTEM; FEEDING BEHAVIOR; KENYA; PLANT STEMS; POACEAE; SYMBIOSIS;

AFRICA; EAST AFRICA; KENYA; SUB-SAHARAN AFRICA;

ACACIA; ACACIA DREPANOLOBIUM; BOS; ELEPHANTIDAE; FORMICIDAE; POACEAE;

EID: 34548568899     PISSN: 00298549     EISSN: None     Source Type: Journal    
DOI: 10.1007/s00442-007-0799-7     Document Type: Article

References (52)

1. Angassa A (2005) The ecological impact of bush encroachment on the yield of grasses in Borana rangeland ecosystem. Afr J Ecol 43:14-20
2. Archer S (1995) Tree-grass dynamics in a Prosopis-thornscrub savanna parkland-reconstructing the past and predicting the future. Ecoscience 2:83-99
3. 2. Clim Change 29:91-99
4. Augustine DJ, McNaughton SJ (2004) Regulation of shrub dynamics by native browsing ungulates on East African rangeland. J Appl Ecol 41:45-58
5. Belsky AJ (1994) Influences of trees on savanna productivity: tests of shade, nutrients, and tree-grass competition. Ecology 75:922-932
6. Belsky AJ, Mwonga SM, Amundson RG, Duxbury JM, Ali AR (1993) Comparative effects of isolated trees on their undercanopy environments in high- and low-rainfall savannas. J Appl Ecol 30:143-155
7. Bertness MD, Callaway RM (1994) Positive interactions in communities. Trends Ecol Evol 9:191-193
8. Bertness MD, Ewanchuk PJ (2002) Latitudinal and climate-driven variation in the strength and nature of biological interactions in New England salt marshes. Oecologia 132:392-401
9. 2 and fire in promoting the spread of grasslands and savannas. Glob Change Biol 9:973-982
10. Callaway RM, Nadkarni NM, Mahill BE (1991) Facilitation and interference of Quercus douglasii on understory productivity in central California. Ecology 72:1484-1499
11. Callaway RM, Brooker RW, Choler P, et al. (2002) Positive interactions among alpine plants increase with stress. Nature 417:844-848
12. Coe M, Beentje H (1991) A field guide to the acacias of Kenya. Oxford University Press, Oxford
13. Dean WRJ, Milton SJ, Jeltsch F (1999) Large trees, fertile islands, and birds in arid savanna. J Arid Environ 41:61-78
14. Dickie IA, Schnitzer SA, Reich PB, Hobbie SE (2005) Spatially disjunct effects of co-occuring competition and facilitation. Ecol Lett 8:1191-1200
15. Dublin HT, Sinclair ARE, McGlade J (1990) Elephants and fire as causes of multiple stable states in the Serengeti-Mara woodlands. J Anim Ecol 59:1147-1164
16. Gadd ME, Young TP, Palmer TM (2001) Effects of simulated shoot and leaf herbivory on vegetative growth and plant defense in Acacia drepanlobium. Oikos 92:515-521
17. Goheen JR, Keesing F, Allan BF, Ogada D, Ostfeld RS (2004) Net effects of large mammals on Acacia seedling survival in an African savanna. Ecology 85:1555-1561
18. Hocking B (1970) Insect associations with the swollen thorn acacias. Trans R Entomol Soc Lond 122:211-255
19. Holmgren M, Scheffer M, Huston MA (1997) The interplay of facilitation and competition in plant communities. Ecology 78:1966-1975
20. Knoop WT, Walker BH (1985) Interactions of woody and herbaceous vegetation in a southern African savanna. J Ecol 73:235-253
21. Lauenroth WK, Aguilera MO (1998) Plant-plant interactions in grasses and grasslands. In: Cheplick GP (ed) Population biology of grasses. Cambridge University Press, Cambridge, pp 209-230
22. Lortie CJ, Brooker RW, Choler P, et al. (2004) Rethinking plant community theory. Oikos 107:433-438
23. Ludwig F, Dawson TE, Kroon H, Berendse F, Prins HHT (2003) Hydraulic lift in Acacia tortilis trees on an East African savanna. Oecologia 134:293-300
24. Madden D, Young TP (1992) Symbiotic ants as an alternative defense against giraffe herbivory in spinescent Acacia drepanolobium. Oecologia 91:235-238
25. Maestre FT, Valladares F, Reynolds JF (2005) Is the change of plant-plant interactions with abiotic stress predictable? A meta-analysis of field results in arid environments. J Ecol 93:748-757
26. Midgley JJ, Bond WJ (2001) A synthesis of the demography of African acacias. J Trop Ecol 17:871-886
27. Misurelli DL (2002) Large ungulate impacts on bird populations in an East African savanna. State University of New York, Albany, NY, p 79
28. O'Connor TG (1995) Acacia karroo invasion of grassland: environmental and biotic effects influencing seedling emergence and establishment. Oecologia 103:214-223
29. Odadi W, Young TP, Okeyo-Owuor JB (2007) Effects of wildlife on cattle diets in Laikipia rangeland, Kenya. Rangeland Ecol Manage 60:179-185
30. Okello BD, O'Connor TG, Young TP (2001) Growth, biomass estimates, and charcoal production of Acacia drepanolobium in Laikipia, Kenya. For Ecol Manage 142:143-153
31. Otieno SG (2004) Effects of domestic and wild herbivore utilization on herbaceous layer aboveground primary production in a central Kenya grassland. University of Nairobi, Nairobi
32. Palmer TM, Brody AK (2007) Mutualism as reciprocal exploitation: African plant-ants defend foliar but not reproductive structures. Ecology (in press)
33. Palmer TM, Young TP, Stanton ML, Wenk E (2000) Short-term dynamics of an acacia ant community in Laikipia, Kenya. Oecologia 123:425-435
34. Pratt DJ, Gwynne MD (1977) Rangeland management and ecology in East Africa. Hodder and Stoughton, London
35. Pringle RM, Young TP, Rubenstein DI, McCauley DJ (2007) Herbivore-initiated interaction cascades and their modulation by productivity in an African savanna. Proc Natl Acad Sci USA 104:193-197
36. Rebollo S, Milchunas DG, Noy-Meir I, Chapman PL (2002) The role of a spiny plant refuge in structuring grazed shortgrass steppe plant communities. Oikos 98:53-64
37. Riginos C, Milton SJ, Wiegand T (2005) Context-dependent interactions between adult shrubs and seedlings in a semi-arid shrubland. J Veg Sci 16:331-340
38. Roques KG, O'Connor TG, Watkinson AR (2001) Dynamics of shrub encroachment in an African savanna: relative influences of fire, herbivory, rainfall and density dependence. J Appl Ecol 38:268-280
39. Rousset O, Lepart J (2000) Positive and negative interactions at different life stages of a colonizing species (Quercus humilis). J Ecol 88:401-412
40. Scholes RJ, Archer SR (1997) Tree-grass interactions in savannas. Annu Rev Ecol Syst 28:517-544
41. Skarpe C (1992) Dynamics of savanna ecosystems. J Veg Sci 3:293-300
42. Stapley L (1998) The interaction of thorns and symbiotic ants as an effective defence mechanism of swollen-thorn acacias. Oecologia 115:401-405
43. Tewksbury JJ, Lloyd JD (2001) Positive interactions under nurse-plants: spatial scale, stress gradients and benefactor size. Oecologia 127:425-434
44. Tobler MW, Cochard R, Edwards PJ (2003) The impact of cattle ranching on large-scale vegetation patterns in a coastal savanna in Tanzania. J Appl Ecol 40:430-444
45. van Auken OW (2000) Shrub invasions of North American semiarid grasslands. Annu Rev Ecol Syst 31:197-215
46. van Vegten JA (1984) Thornbush invasion in a savanna ecosystem in eastern Botswana. Vegetation 56:3-7
47. Vetaas OR (1992) Micro-site effects of trees and shrubs in dry savannas. J Veg Sci 3:337-344
48. Western D, Maitumo D (2004) Woodland loss and restoration in a savanna park: a 20-year experiment. Afr J Ecol 42:111-121
49. Young TP, Stubblefield CH, Isbell LA (1997) Ants on swollen-thorn acacias: species coexistence in a simple system. Oecologia 109:98-107
50. Young TP, Okello BD, Kinyua D, Palmer TM (1998) KLEE: a long-term multi-species herbivore exclusion experiment in Laikipia, Kenya. Afr J Range Forage Sci 14:94-102
51. Young TP, Stanton ML, Christian CE (2003) Effects of natural and simluated herbivory on spine lengths of Acacia drepanolobium in Kenya. Oikos 101:171-179
52. Young TP, Palmer TM, Gadd ME (2005) Competition and compensation among cattle, zebras, and elephants in a semi-arid savanna in Laikipia, Kenya. Biol Conserv 122:351-359