Season- and herbivore-dependent competition and facilitation in a semiarid savanna

Ecology

Volumn 89, Issue 6, 2008, Pages 1532-1540

  Veblen, Kari E ^a  

^a UNIVERSITY OF CALIFORNIA   (United States)

Author keywords

Acacia drepanolobium savanna; Associational resistance; Cynodon plectostachyus; Facilitation; Grasslands; Herbivory; Indirect effects; Kenya; Pennisetum stramineum; Succession

Indexed keywords

GRASS; GRASSLAND; HERBIVORE; HERBIVORY; INTERSPECIFIC COMPETITION; SAVANNA; SEMIARID REGION; SUCCESSION;

AFRICA; EAST AFRICA; KENYA; LAIKIPIA; RIFT VALLEY; SUB-SAHARAN AFRICA;

ACACIA; ACACIA DREPANOLOBIUM; CYNODON PLECTOSTACHYUS; PENNISETUM; PENNISETUM GLAUCUM; PENNISETUM STRAMINEUM;

WATER;

ANIMAL; ARTICLE; ECOSYSTEM; FEEDING BEHAVIOR; MAMMAL; PHYSIOLOGY; POACEAE; SEASON;

ANIMALS; ECOSYSTEM; FEEDING BEHAVIOR; MAMMALS; POACEAE; SEASONS; WATER;

EID: 53649089497     PISSN: 00129658     EISSN: None     Source Type: Journal    
DOI: 10.1890/07-0973.1     Document Type: Article

References (76)

1. Agrawal, A. A., et al. 2007. Filling key gaps in population and community ecology. Frontiers in Ecology and the Environment 5:145-152.
2. Ahn, P. M. and L. C. Geiger. 1987. Kenya soil survey: soils of Laikipia District. Ministry of Agriculture, National Agricultural Laboratories, Kabete, Kenya.
3. Armas. C., R. Ordiales. and F. I. Pugnaire. 2004. Measuring plant interactions: a new comparative index, Ecology 85: 2682-2686.
4. Armas, C., and F. I. Pugnaire. 2005. Plant interactions govern population dynamics in a semi-arid plant community. Journal of Ecology 93:978-989.
5. Arnold, G. W. 1987. Influence of the biomass, botanical composition and sward height of annual pastures on foraging behavior by sheep. Journal of Applied Ecology 24:759-772.
6. Attsat, P. R., and D. J. O'Dowd, 1976. Plant defense guilds. Science 193:24-29.
7. Augustine, D. J., and S. J. McNaughton. 2006. Interactive effects of ungulate herbivores, soil fertility, and variable rainfall on ecosystem processes in a semi-arid savanna. Ecosystems 9:1242-1256.
8. Baraza. E., R. Zamora, and J. A. Hódar. 2006. Conditional outcomes in plant-herbivore interactions: neighbours matter. Oikos 113:148-156.
9. Baumeister, D., and R. M. Callaway. 2006. Facilitation by Pinus flexilis during succession: a hierarchy of mechanisms benefits other plant species. Ecology 87:1816-1830.
10. Belovsky, G. E. 1997. Optimal foraging and community structure: the allometry of herbivore food selection and competition. Evolutionary Ecology 11:641-672.
11. Bertness, M. D., and R. M. Callaway. 1994. Positive interactions in communities. Trends in Ecology and Evolution 9:191-193.
12. Bokdam, J. 2001. Effects of browsing and grazing on cyclic succession in nutrient-limited ecosystems. Journal of Vegetation Science 12:875-886.
13. Bossuyt, B., B. De Fre, and M, Hoffmann. 2005. Abundance and flowering success patterns in a short-term grazed grassland: early evidence of facilitation. Journal of Ecology 93:1104-1114.
14. Brooker, R. W., D, Scott, S. C. F. Palmer, and E, Swaine. 2006. Transient faciltative effects of heather on Scots pine along a grazing disturbance gradient in Scottish moorland. Journal of Ecology 94:637-645.
15. Callaway, R. M. 1992. Effect of shrubs on recruitment of Quercus douglasii and Quercus lobata in California. Ecology 73:2118-2128.
16. Callaway, R. M. 1995. Positive interactions among plants. Botanical Review 61:306-349.
17. Callaway, R. M., and E. T. Aschehoug. 2000. Invasive plants versus their new and old neighbors: a mechanism for exotic invasion. Science 290:521-523.
18. Callaway, R. M., et al. 2002. Positive interactions among alpine plants increase with stress. Nature 417:844-848.
19. Callaway, R. M. D. Kikodze, M. Chiboshvili. and L. Khetsuriani. 2005. Unpalatable plants protect neighbors from grazing and increase plant community diversity. Ecology 86:1856-1862.
20. Callaway, R. M., Z. Kikvidze, and D. Kikodze. 2000. Facilitation by unpalatable weeds may conserve plant diversity in overgrazed meadows in the Caucasus Mountains. Oikos 89:275-282.
21. Casper, B. B. 1996. Demographic consequences of drought in the herbaceous perennial Cryptantha flava: effects of density, associations with shrubs, and plant size. Oecologia 106:144-152.
22. Casper, B. B., and R. B. Jackson. 1997. Plant competition underground. Annual Review of Ecology and Systematics 28: 545-570.
23. Connell, J. H. 1983. On the prevalence and relative importance of interspecific competition: evidence from field experiments. American Naturalist 122:661-696.
24. Connell, J. H., and R. O. Slatyer. 1977. Mechanisms of succession in natural communities and their role in community stability and organization. American Naturalist 111: 1119-1144.
25. Demment, M. W., and P. J. Van Soest. 1985. A nutritional explanation for body size patterns of ruminant and nonruminant herbivores. American Naturalist 125:641-672.
26. Dickie, I. A., S. A. Schnitzer, P. B. Reich, and S. E. Hobbie. 2007. Is oak establishment in old-fields and savanna openings context dependent? Journal of Ecology 95:309-320.
27. Dormann, C. F., R. Van Der Wal, and J. P. Bakker. 2000. Competition and herbivory during salt marsh succession: the importance of forb growth strategy. Journal of Ecology 88: 571-583.
28. Fagan. W. F., and J. G. Bishop. 2000. Trophic interactions during primary succession: herbivores slow a plant reinvasion at Mount St. Helens. American Naturalist 155:238-251.
29. Fowler, N. L. 2002. The joint effects of grazing, competition, and topographic position on six savanna grasses. Ecology 83: 2477-2488.
30. Fynn, R. W. S., and T. G. O'Connor. 2000. Effect of stocking rate and rainfall on rangeland dynamics and cattle performance in a semi-arid savanna, South Africa. Journal of Applied Ecology 37:491-507.
31. Goldberg. D. E., and A. M. Barton. 1992. Patterns and consequences of interspecific competition in natural communities: a review of field experiments with plants. American Naturalist 139:771-801.
32. Goldberg, D., and A. Novoplansky, 1997. On the relative importance of competition in unproductive environments. Journal of Ecology 85:409-418.
33. Goldberg, D. E., T. Rajaniemi, J. Gurevitch, and A. Stewart-Oaten. 1999. Empirical approaches to quantifying interaction intensity: competition and facilitation along productivity gradients. Ecology 80:1118-1131.
34. Gómez, J. M. 2005. Long-term effects of ungulates on performance, abundance, and spatial distribution of two montane herbs. Ecological Monographs 75:231-258.
35. Gómez, J. M., J. A. Hódar, R. Zamora. J. Castro, and D. García. 2001. Ungulate damage on Scots pines in Mediterranean environments: effects of association with shrubs. Canadian Journal of Botany 79:739-746.
36. Graff, P., M. R. Auguiar, and E. J. Chaneton. 2007. Shifts in positive and negative plant interactions along a grazing intensity gradients. Ecology 88:188-199.
37. Gratton, C., and R. F. Denno. 2003. Inter-year carryover effects of a nutrient pulse on Spartina plants, herbivores, and natural enemies. Ecology 84:2692-2707.
38. Greenlee, J. T., and R. M. Callaway. 1996. Abiotic stress and the relative importance of interference and facilitation in montane bunchgrass communities in western Montana. American Naturalist 148:386-396.
39. Grime, J. P. 1973. Competition and diversity in herbaceous vegetation. Nature 244:310-311.
40. Grime, J. P. 1977. Evidence for the existence of three primary strategies in plants and its relevance to ecological and evolutionary theory. American Naturalist 111:1169-1194.
41. Gurevitch, J., J. A. Morrison, and L. V. Hedges. 2000. The interaction between competition and predation: a meta-analysis of field experiments. American Naturalist 155:435-453.
42. Hambäck, P. A., J. Agren, and L. Ericson. 2000. Associational resistance: insect damage to purple loosestrife reduced in thickets of sweet gale. Ecology 81:1784-1794.
43. Hambäck, P. A., and A. P. Bcckemian. 2003. Herbivory and plant resource competition: a review of two interacting interactions. Oikos 101:26-37.
44. Hjältén, J., K. Danell, and P. Lundberg. 1993. Herbivore avoidance by association: vole and hare utilization of woody plants. Oikos 68:125-131.
45. Hobbs, N. T. 1996. Modification of ecosystems by ungulates. Journal of Wildlife Management 60:695-713.
46. Holmes, R. D., and K. Jepson-Innes. 1989. A neighborhood analysis of herbivory in Bouteloua gracilis. Ecology 70:971-976.
47. Holmgren, M., M. Scheffer, and M. A. Huston. 1997. The interplay of facilitation and competition in plant communities. Ecology 78:1966-1975.
48. Holzapfel, C., and B. E. Mahall. 1999. Bidirectional facilitation and interference between shrubs and annuals in the Mojave Desert. Ecology 80:1747-1761.
49. Illius, A. W., and T. G. O'Connor. 1999. On the relevance of nonequilibrium concepts to arid and semiarid grazing systems. Ecological Applications 9:798-813.
50. Illius, A. W., and T. G. O'Connor. 2000. Resource heterogeneity and ungulate population dynamics. Oikos 89:283-294.
51. Kikvidze, Z., L. Khetsuriani, D. Kikodze, and R. M. Callaway. 2006. Seasonal shifts in competition and facilitation in subalpine plant communities of the central Caucasus. Journal of Vegetation Science 17:77-82.
52. Maestre, F. T., S. Bautista, and J. Cortina. 2003. Positive, negative, and net effects in grass-shrub interactions in mediterranean semiarid grasslands. Ecology 84:3186-3197.
53. Maestre, F. T., F. Valladares, and J. F. Reynolds. 2005. Is the change of plant-plant interactions with abiotic stress predictable? A meta-analysis of field results in arid environments. Journal of Ecology 93:748-757.
54. McNaughton, S. J. 1978. Serengeti ungulates: feeding selectivity influences the effectiveness of plant defense guilds. Science 199:806-807. Milchunas, D. G., and I. Noy-Meir. 2002. Grazing refuges, external avoidance of herbivory and plant diversity. Oikos 99:113-130.
55. Noy-Meir, I. 1973. Desert ecosystems: environment and producers. Annual Review of Ecology & Systematics 4:25-51.
56. Olff, H., F. W. M. Vera, J. Bokdam, E. S. Bakker, J. M. Gleichman, K. de Maeyer, and R. Smit. 1999. Shifting mosaics in grazed woodlands driven by the alternation of plant facilitation and competition. Plant Biology 1:127-137.
57. Osem, Y., A. Perevolotsky, and J. Kigel. 2002. Grazing effect on diversity of annual plant communities in a semi-arid rangeland: interactions with small-scale spatial and temporal variation in primary productivity. Journal of Ecology 90: 936-946.
58. Proulx, M., and A. Mazumder. 1998. Reversal of grazing impact on plant species richness in nutrient-poor vs. nutrientrich ecosystems. Ecology 79:2581-2592.
59. Pugnaire, F. I., and R. Lazaro. 2000. Seed bank and understorey species composition in a semi-arid environment: the effect of shrub age and rainfall. Annals of Botany 86:807-813.
60. Pugnaire, F. I., and M. T. Luque. 2001. Changes in plant interactions along a gradient of environmental stress. Oikos 93:42-49.
61. Rebollo, S., D. G. Milchunas, 1. Noy-Meir, and P. L. Chapman. 2002. The role of a spiny plant refuge in structuring grazed shortgrass steppe plant communities. Oikos 98:53-64.
62. Root, R. B. 1973. Organization of a plant-arthropod association in simple and diverse habitats: the fauna of collards (Brassica oleracea). Ecological Monographs 43:95-124.
63. Rousset, O., and J. Lepart. 2000. Positive and negative interactions at different life stages of a colonizing species (Quercus humilis). Journal of Ecology 88:401-412.
64. Rousset, O., and J. Lepart. 2002. Neighbourhood effects on the risk of an unpalatable plant being grazed. Plant Ecology 165: 197-206.
65. Schoener, T. W. 1983. Field experiments on interspecific competition. American Naturalist 122:240-285.
66. Scoones, I. 1995. Expoiting heterogeneity: habitat use by cattle in dryland Zimbabwe, Journal of Arid Environments 29:221-237.
67. Seabloom, E. W., and S. A. Richards. 2003. Multiple stable equilibria in grasslands mediated by herbivore population dynamics and foraging behavior. Ecology 84:2891-2904.
68. Skarpe, C. 2001. Effects of large herbivores on competition and succession in natural savannah rangelands. Pages 175-191 in P. Tow and A. Lazenby, editors. Competition and succession in pastures. CABI Publishing, New York, New York, USA.
69. Smit, C., C. Vandenberghe, J. den Ouden, and H. Müller-Schärer. 2007. Nurse plants, tree saplings and grazing pressure: changes in facilitation along a biotic environmental gradient. Oecologia 152:265-273.
70. Tielborger, K., and R. Kadmon. 2000. Temporal environmental variation tips the balance between facilitation and interference in desert plants. Ecology 81:1544-1553.
71. Tilman, D. 1985. The resource-ratio hypothesis of plant succession. American Naturalist 125:827-852.
72. Tilman, D. 1988. Plant strategies and the dynamics and structure of plant communities. Princeton University Press, Princeton, New Jersey, USA.
73. van der Wal, R., M, Egas, A. van der Veen, and J. Bakker. 2000. Effects of resource competition and herbivory on plant performance along a natural productivity gradient. Journal of Ecology 88:317-330.
74. Young, T. P., B. D. Okello, D. Kinyua, and T. M. Palmer. 1998. KLEE: a long-term multi-species herbivore exclusion experiment in Laikipia, Kenya. African Journal of Range and Forage Science 14:94-102.
75. Young, T. P., T. M. Palmer, and M. E. Gadd. 2005. Competition and compensation among cattle, zebras, and elephants in a semi-arid savanna in Laikipia, Kenya. Biological Conservation 122:351-359.
76. Zanini, L., G. Ganade, and I. Hübel. 2006. Facilitation and competition influence succession in a subtropical old field. Plant Ecology 185:179-190.