Cryptic herbivores mediate the strength and form of ungulate impacts on a long-lived savanna tree

Ecology

Volumn 92, Issue 8, 2011, Pages 1626-1636

  Maclean, Janet E ^a,b   Goheen, Jacob R ^b,c   Doak, Daniel F ^b,c   Palmer, Todd M ^b,d   Young, Truman P ^b,e  

^a UNIVERSITY OF BRITISH COLUMBIA   (Canada)

^b MPALA RESEARCH CENTRE   (Kenya)

^c UNIVERSITY OF WYOMING   (United States)

^d University of Florida   (United States)

^e UNIVERSITY OF CALIFORNIA   (United States)

Author keywords

Acacia drepanolobium; African savanna; Demography; Herbivory; Kenya; Kenya Long term Exclosure Experiment; Lambda; Matrix model; Mpala Research Centre; Rodent; Seed predation; Tree recruitment; Ungulate

Indexed keywords

CATTLE; EXCLUSION EXPERIMENT; GROWTH RATE; GUILD; HERBIVORE; LIFE CYCLE; PLANT COMMUNITY; PLANT-HERBIVORE INTERACTION; POPULATION DECLINE; POPULATION GROWTH; POPULATION MODELING; POPULATION REGULATION; RODENT; SAVANNA; SEEDLING EMERGENCE; SURVIVAL; UNGULATE; WOODY PLANT;

ACACIA; AFRICA; ANIMAL; ANTELOPE; ARTICLE; CATTLE; ECOSYSTEM; ELEPHANT; FEEDING BEHAVIOR; HORSE; PHYSIOLOGY; RODENT; TREE;

ACACIA; AFRICA; ANIMALS; ANTELOPES; CATTLE; ECOSYSTEM; ELEPHANTS; EQUIDAE; FEEDING BEHAVIOR; RODENTIA; TREES;

KENYA;

ACACIA DREPANOLOBIUM; BOS TAURUS; ELEPHANTIDAE; RODENTIA; UNGULATA;

EID: 79961033423     PISSN: 00129658     EISSN: None     Source Type: Journal    
DOI: 10.1890/10-2097.1     Document Type: Article

References (72)

1. Akima, H., A. Gebhardt, and T. Petzoldt. 2009. Akima: interpolation of irregularly spaced data. R package version 0.5-4. R Foundation for Statistical Computing, Vienna, Austria.http://CRAN.R-project.org/package=akimai
2. Andersen, A. N. 1989. How important is seed predation to recruitment in stable populations of long-lived perennials? Oecologia 81:310-315. (Pubitemid 20429005)
3. Angassa, A. 2005. The ecological impact of bush encroachment on the yield of grasses in Borana rangeland ecosystem. African Journal of Ecology 43:14-20. (Pubitemid 40346437)
4. Augustine, D. J., and S. J. McNaughton. 2004. Regulation of shrub dynamics by native browsing ungulates on East African rangeland. Journal of Applied Ecology 41:45-58. (Pubitemid 38204097)
5. Baldock, K. C. R. 2007. Multi-species pollination interactions in a Kenyan savannah ecosystem. Dissertation. University of Edinburgh, Edinburgh, Scotland, UK.
6. Boege, K., and R. J. Marquis. 2005. Facing herbivory as you grow up: the ontogeny of resistance in plants. Trends in Ecology and Evolution 20:441-448. (Pubitemid 41026730)
7. Bruna, E. M., and M. K. Oli. 2005. Demographic effects of habitat fragmentation on a tropical herb: life-table response experiments. Ecology 86:1816-1824. (Pubitemid 40938783)
8. Caswell, H. 2001. Matrix population models. Sinauer Associates, Sunderland, Massachusetts, USA.
9. Ceballos, G., and P. R. Ehrlich. 2002. Mammal population losses and the extinction crisis. Science 296:904-907. (Pubitemid 34464894)
10. Chase, J. M., M. A. Leibold, A. L. Downing, and J. B. Shurin. 2000. The effects of productivity, herbivory, and plant species turnover in grassland food webs. Ecology 81:2485-2497.
11. Chew, F. S., and S. P. Courtney. 1991. Plant apparency and evolutionary escape from insect herbivory. American Naturalist 138:729-750.
12. Clark, C. J., J. R. Poulsen, D. J. Levey, and C. W. Osenberg. 2007. Are plant populations seed limited? A critique and meta-analysis of seed addition experiments. American Naturalist 170:128-142. (Pubitemid 46984582)
13. Crawley, M. J. 1997. Plant-herbivore dynamics. Pages 401-474 in M. J. Crawley, editor. Plant ecology. Blackwell Science, Oxford, UK.
14. Davis, A. S., D. A. Landis, V. Nuzzo, B. Blossey, E. Gerber, and H. L. Hinz. 2006. Demographic models inform selection of biocontrol agents for garlic mustard (Alliaria petiolata).Ecological Applications 16:2399-2410. (Pubitemid 44917595)
15. Deveny, A. J., and L. R. Fox. 2006. Indirect interactions between browsers and seed predators affect the seed bank dynamics of a chaparral shrub. Oecologia 150:69-77.
16. Doak, D. F. 1992. Lifetime impacts of herbivory for a perennial plant. Ecology 73:2086-2099. (Pubitemid 23399499)
17. Dublin, H. T., A. R. E. Sinclair, and J. McGlade. 1990. Elephants and fire as causes of multiple stable states in the Serengeti Mara woodlands. Journal of Animal Ecology 59:1147-1164.
18. du Toit, J., H. C. Biggs, and K. H. Rogers. 2003. The Kruger experience; ecology and management of savanna heterogeneity. Island Press, Chicago, Illinois, USA.
19. Easterling, M. R., S. P. Ellner, and P. M. Dixon. 2000. Sizespecific sensitivity: applying a new structured population model. Ecology 81:694-708. (Pubitemid 30437994)
20. Edkins, M. T., L. M. Kruger, K. Harris, and J. J. Midgley. 2007. Baobabs and elephants in Kruger National Park: nowhere to hide. East African Journal of Ecology 46:119-125. (Pubitemid 351798690)
21. Finkelstein, M. E., D. F. Doak, M. Nakagawa, P. R. Sievert, and J. Klavitter. 2010. Assessment of demographic risk factors and management priorities: impacts on juveniles substantially affect population viability of a long-lived seabird. Animal Conservation 13:148-156.
22. Fornara, D. A., and J. T. du Toit. 2008. Responses of woody saplings exposed to chronic mammalian herbivory in an African savanna. Ecoscience 15:129-135. (Pubitemid 351523455)
23. Garcia, M. B., F. X. Picó , and J. Ehrlén. 2008. Life span correlates with population dynamics in perennial herbaceous plants. American Journal of Botany 95:258-262. (Pubitemid 351198207)
24. Goheen, J. R., F. Keesing, B. F. Allan, D. Ogada, and R. S. Ostfeld. 2004. Net effects of large mammals on Acacia seedling survival in an African savanna. Ecology 85:1555-1561. (Pubitemid 39188147)
25. Goheen, J. R., and T. M. Palmer. 2010. Defensive plant-ants stabilize megaherbivore-driven landscape change in an African savanna. Current Biology 20:1768-1772.
26. Goheen, J. R., T. M. Palmer, F. Keesing, C. Riginos, and T. P. Young. 2010. Large herbivores facilitate savanna tree establishment via diverse and indirect pathways. Journal of Animal Ecology 79:372-382.
27. Goheen, J. R., T. P. Young, F. Keesing, and T. M. Palmer. 2007. Consequences of herbivory by native ungulates for the reproduction of a savanna tree. Journal of Ecology 95:129-138. (Pubitemid 44952304)
28. Guldemond, R., and R. van Aarde. 2008. A meta-analysis of the impact of African elephants on savanna vegetation. Journal of Wildlife Management 72:892-899. (Pubitemid 351656360)
29. Hairston, N. G., F. E. Smith, and L. B. Slobodkin. 1960. Community structure, population control, and competition. American Naturalist 94:421-425.
30. Hartley, S. E., and C. G. Jones. 1997. Plant chemistry and herbivory, or why the world is green. Pages 284-324 in M. J. Crawley, editor. Plant ecology. Blackwell Science, Oxford, UK.
31. Hejcmanova, P., M. Hejcman, A. A. Camara, and M. Antoninova. 2009. Exclusion of livestock grazing and wood collection in dryland savannah: an effect on long-term vegetation succession. African Journal of Ecology 48:408-417.
32. Heppell, S. S., H. Caswell, and L. B. Crowder. 2000. Life histories and elasticity patterns: perturbation analysis for species with minimal demographic data. Ecology 81:654-665. (Pubitemid 30437991)
33. Horvitz, C. C., and D. W. Schemske. 1995. Spatiotemporal variation in demographic transitions of a tropical understory herb: projection matrix analysis. Ecological Monographs 65:155-192.
34. Huntzinger, P. M., R. Karban, T. P. Young, and T. M. Palmer. 2004. Relaxation of induced indirect defenses of acacias following exclusion of mammalian herbivores. Ecology 85:609-614. (Pubitemid 38398273)
35. Jeltsch, F., S. J. Milton, W. R. J. Dean, and N. Van Rooyen. 1997. Analysing shrub encroachment in the southern Kalahari: a grid-based modeling approach. Journal of Applied Ecology 34:1497-1508. (Pubitemid 28042908)
36. Kalwij, J. M., W. F. de Boer, L. Mucina, H. H. T. Prins, C. Skarpe, and C. W. Winterbach. 2010. Tree cover and biomass increase in a southern African savanna despite growing elephant population. Ecological Applications 20:222-233.
37. Kauffman, M. J., and J. L. Maron. 2006. Consumers limit the abundance and dynamics of a perennial shrub with a seed bank. American Naturalist 168:454-470. (Pubitemid 44582853)
38. Keesing, F. 2000. Cryptic consumers and the ecology of an African savanna. BioScience 50:205-215. (Pubitemid 30118887)
39. Louda, S. M., and M. A. Potvin. 1995. Effect of inflorescencefeeding insects on the demography and lifetime fitness of a native plant. Ecology 76:229-245.
40. MacDougall, A. S., A. Duwyn, and N. T. Jones. 2010. Consumer-based limitations drive oak recruitment failure. Ecology 91:2092-2099.
41. McEvoy, P. B., and E. M. Coombs. 1999. Biological control of plant invaders: regional patterns, field experiments, and structured population models. Ecological Applications 9:387-401. (Pubitemid 29221215)
42. McEvoy, P. B., and N. T. Rudd. 1993. Effects of vegetation disturbances on insect biological control of tansy ragwort, Senecio jacobaea. Ecological Applications 3:682-698.
43. McFadyen, R. E. C. 1998. Biological control of weeds. Annual Review of Entomology 43:369-393.
44. Metz, M. R., and F. Keesing. 2001. Dietary choices of the pouched mouse (Saccostomus mearnsi) in central Kenya. Biotropica 33:182-187. (Pubitemid 32507432)
45. Midgley, J. J., and W. J. Bond. 2001. A synthesis of the demography of African acacias. Journal of Tropical Ecology 17:871-886. (Pubitemid 34003951)
46. Miller, T. E. X., S. M. Louda, K. A. Rose, and J. O. Eckberg. 2009. Impacts of insect herbivory on cactus population dynamics: experimental demography across an environmental gradient. Ecological Monographs 79:155-172.
47. Morris, W. F., and D. F. Doak. 2002. Quantitative conservation biology. Sinauer Associates, Sunderland, Massachusetts, USA.
48. Murdoch, W. W. 1966. "Community structure, population control, and competition"-a critique. American Naturalist 100:219-226.
49. Norghauer, J. M., and D. M. Newbery. 2010. Recruitment limitation after mast-seeding in two African rain forest trees. Ecology 91:2303-2312.
50. Odadi, W. O., T. P. Young, and J. B. Okeyo-Owuor. 2007. Effects of wildlife on cattle diets in Laikipia rangeland, Kenya. Rangeland Ecology and Management 60:179-185. (Pubitemid 46549159)
51. Okello, B. D., and T. P. Young. 2000. Effects of fire, bruchid beetles, and soil type on the germination and seedlingestablishment of Acacia drepanolobium. African Journal of Range and Forest Science 17:46-51.
52. Oksanen, L., S. D. Fretwell, J. Arruda, and P. Niemla. 1981. Exploitation ecosystems in gradients of primary productivity. American Naturalist 118:240-261.
53. Paine, R. T. 1980. Food webs: linkage, interaction strength and community infrastructure. Journal of Animal Ecology 49:667-685.
54. Post, E., and C. Pedersen. 2008. Opposing plant community responses to warming with and without herbivores. Proceedings of the National Academy of Sciences USA 105:12353-12358.
55. Pratt, D. J., and M. D. Gwynne. 1977. Rangeland management and ecology in East Africa. Hodder and Stoughton, London, UK.
56. R Development Core Team. 2010. R: A language and environment for statistical computing. R Foundation for Statistical Computing, Vienna, Austria.http://www.R-project.orgi
57. Riginos, C. 2009. Grass competition suppresses savanna tree growth across multiple demographic stages. Ecology 90:335-340.
58. Riginos, C., and J. B. Grace. 2008. Savanna tree density, herbivores, and the herbaceous community: bottom-up vs. top-down effects. Ecology 89:2228-2238.
59. Room, P. M. 1990. Ecology of a simple plant-herbivore system: biological control of Salvinia. Trends in Ecology and Evolution 5:74-79. (Pubitemid 120036262)
60. Sankaran, M., J. Ratnam, and N. P. Hanan. 2004. Tree-grass coexistence in savannas revisited-insights from an examination of assumptions and mechanisms invoked in existing models. Ecology Letters 7:480-490. (Pubitemid 38693390)
61. Sharam, G. J., A. R. E. Sinclair, and R. Turkington. 2009. Serengeti birds maintain forests by inhibiting seed predators. Science 325:51-51.
62. Sinclair, A. R. E., and P. Arcese. 1995. Serengeti II: Dynamics, management and conservation of an ecosystem. Chicago University Press, Chicago, Illinois, USA.
63. Smit, R., J. Bokdam, J. den Ouden, H. Olff, H. Schot- Opschoor, and M. Schrijvers. 2001. Effects of introduction and exclusion of large herbivores on small rodent communities. Plant Ecology 155:119-127. (Pubitemid 34002087)
64. Stowe, K. A., R. J. Marquis, C. G. Hochwender, and E. L. Simms. 2000. The evolutionary ecology of tolerance to consumer damage. Annual Review of Ecology and Systematics 31:565-595. (Pubitemid 32122413)
65. Stubben, C. J., and B. G. Milligan. 2007. Estimating and analyzing demographic models using the popbio Package in R. Journal of Statistical Software 22:11.
66. Tuljapurkar, S. D. 1982. Population dynamics in variable environments. III. Evolutionary dynamics of r-selection. Theoretical Population Biology 21:141-165.
67. van Langevelde, F., C. A. D. M. van de Vijver, L. Kumar, J. van de Koppel, N. de Ridder, J. van Andel, A. K. Skidmore, J. W. Hearne, L. Stroosnijder, W. J. Bond, H. H. T. Prins, and M. Rietkerk. 2003. Effects of fire and herbivory on the stability of savanna ecosystems. Ecology 84:337-350. (Pubitemid 36893071)
68. Weltzin, J. F., S. R. Archer, and R. K. Heitschmidt. 1997. Small-mammal regulation of vegetation structure in a temperate savanna. Ecology 78:751-763.
69. Yarnell, R. W., D. M. Scott, C. T. Chimimba, and D. J. Metcalfe. 2007. Untangling the roles of fire, grazing and rainfall on small mammal communities in grassland ecosystems. Oecologia 154:387-402. (Pubitemid 350077133)
70. Young, T. P., B. 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 14:92-104.
71. 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. (Pubitemid 40727810)
72. Young, T. P., M. L. Stanton, and C. E. Christian. 2003. Effects of natural and simulated herbivory on spine lengths of Acacia drepanolobium in Kenya. Oikos 101:171-179. (Pubitemid 36614730)