Ecological Research

, Volume 17, Issue 2, pp 261–273 | Cite as

Food webs in space: On the interplay of dynamic instability and spatial processes

Special Issue

Ecologists increasingly recognize that a consideration of spatial dynamics is essential for resolving many classical problems in community ecology. In the present paper, I argue that understanding how trophic interactions influence population stability can have important implications for the expression of spatial processes. I use two examples to illustrate this point. The first example has to do with spatial determinants of food chain length. Prior theoretical and empirical work has suggested that colonization–extinction dynamics can influence food chain length, at least for specialist consumers. I briefly review evidence and prior theory that food chain length is sensitive to area. A metacommunity scenario, in which each of various patches can have a food chain varying in length (but in which a consumer is not present on a patch unless its required resource is also present), shows that alternative landscape states are possible. This possibility arises if top predators moderate unstable interactions between intermediate predators and basal resources. The second example has to do with the impact of recurrent immigration on the stability of persistent populations. Immigration can either stabilize or destabilize local population dynamics. Moreover, an increase in immigration can decrease average population size for unstable populations with direct density-dependence, or in predator–prey systems with saturating functional responses. These theoretical models suggest that the interplay of temporal variation and spatial fluxes can lead to novel qualitative phenomena.

Key words

food chain length metacommunity spatial flows spatial food web ecology 

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REFERENCES

  1. Abrams P. A. (1992) Why don’t predators have positive effects on prey populations? Evolutionary Ecology 6: 449–457.Google Scholar
  2. Abrams P. A. & Roth J. D. (1994) The effects of enrichment of 3-species food-chains with nonlinear functional-responses. Ecology 75: 1118–1130.Google Scholar
  3. Belyea L. R. & Lancaster J. (1999) Assembly rules within a contingent ecology. Oikos 86: 402–416.Google Scholar
  4. Bonsall M. B. & Hassell M. P. (2000) The effects of metapopulation structure on indirect interactions in host-parasitoid assemblages. Proceedings of the Royal Society of London Series B-Biological Sciences 267: 2207–2212.CrossRefGoogle Scholar
  5. Cohen J. E. & Newman C. M. (1985) A stochastic-theory of community food webs.1. Models and aggregated data. Proceedings of the Royal Society of London Series B-Biological Sciences 224: 421–448.Google Scholar
  6. Cohen J. E. & Newman C. M. (1991) Community area and food-chain length – theoretical predictions. American Naturalist 138: 1542–1554.CrossRefGoogle Scholar
  7. Doebeli M. (1995) Dispersal and dynamics. Theoretical Population Biology 47: 82–106.CrossRefGoogle Scholar
  8. Ekerholm P., Okansen L. & Okansen T. (2001) Long-term dynamics of voles and lemmings at the timberline and above the willow limit as a test of hypotheses on trophic interactions. Ecography 24: 555–568.CrossRefGoogle Scholar
  9. Elton C. S. (1927) Animal Ecology. Sidgwick and Jackson, London.Google Scholar
  10. Hassell M. P. (2000) The Spatial and Temporal Dynamics of Host–Parasitoid Interactions. Oxford University Press, Oxford.Google Scholar
  11. Holt R. D. (1983a) Immigration and the dynamics of peripheral populations. In: Advances in Herpetology and Evolutionary Biology. (eds K. Miyata & A. Rhodin) pp. 680–694. Museum of Comparative Zoology, Harvard University, Cambridge, Massachusetts.Google Scholar
  12. Holt R. D. (1983b) Models for peripheral populations: The role of immigration. In: Lecture Notes in Biomathematics. (eds H. I. Freedman & C. Strobeck) pp. 25–32. Springer-Verlag, Berlin.Google Scholar
  13. Holt R. D. (1992) A neglected facet of island biogeography – the role of internal spatial dynamics in area effects. Theoretical Population Biology 41: 354–371.CrossRefGoogle Scholar
  14. Holt R. D. (1993) Ecology at the mesoscale: The influence of regional processes on local communities. In: Species Diversity in Ecological Communities. (eds R. Ricklefs & D. Schluter) pp. 77–88. University of Chicago Press, Chicago.Google Scholar
  15. Holt R. D. (1996) Food webs in space: an island biogeographic perspective. In: Food Webs: Contemporary Perspectives. (eds G. A. Polis & K. Winemiller) pp. 313–323. Chapman & Hall, New York.Google Scholar
  16. Holt R. D. (1997a) Community modules. In: Multitrophic Interactions in Terrestrial Systems. (eds A. C. Gange & V. K. Brown) pp. 333–349. Blackwell Science, Oxford.Google Scholar
  17. Holt R. D. (1997b) From metapopulation dynamics to community structure: some consequences of spatial heterogeneity. In: Metapopulation Biology. (eds I. Hanski & M. Gilpin) pp. 149–164. Academic Press, New York.Google Scholar
  18. Holt R. D., Lawton J. H., Polis G. A. & Martinez N. D. (1999) Trophic rank and the species-area relationship. Ecology 80: 1495–1504.Google Scholar
  19. Holyoak M. (2000) Habitat subdivision causes changes in food web structure. Ecology Letters 3: 509–515.CrossRefGoogle Scholar
  20. Huxel G. R. & McCann K. (1998) Food web stability: The influence of trophic flows across habitats. American Naturalist 152: 460–469.CrossRefGoogle Scholar
  21. Jansen V. A. A. (1995) Regulation of predator-prey systems through spatial interactions: a possible solution to the paradox of enrichment. Oikos 74: 384–390.Google Scholar
  22. Komonen A., Penttila R., Lindgren M. & Hanski I. (2000) Forest fragmentation truncates a food chain based on an old-growth forest bracket fungus. Oikos 90: 119–126.CrossRefGoogle Scholar
  23. Law R. & Morton R. D. (1993) Alternative permanent states of ecological communities. Ecology 74: 1347–1361.Google Scholar
  24. Lockwood J. L., Powell R. D., Nott M. P. & Pimm S. L. (1997) Assembling ecological communities in time and space. Oikos 80: 549–553.Google Scholar
  25. MacArthur R. H. & Wilson E. O. (1967) The Theory of Island Biogeography. Princeton University Press, Princeton, NJ.Google Scholar
  26. McCallum H. I. (1992) Effects of immigration on chaotic population-dynamics. Journal of Theoretical Biology 154: 277–284.Google Scholar
  27. May R. M. (1973) Time-delay versus stability in population models with 2 and 3 trophic levels. Ecology 54: 315–325.Google Scholar
  28. Mikkelson G. M. (1993) How do food webs fall apart? A study of changes in trophic structure during relaxation on habitat fragments. Oikos 67: 539–547.Google Scholar
  29. Morton R. D. & Law R. (1997) Regional species pools and the assembly of local ecological communities. Journal of Theoretical Biology 187: 321–331.CrossRefGoogle Scholar
  30. Nakano S. & Murakami M. (2001) Reciprocal subsidies: Dynamic interdependence between terrestrial and aquatic food webs. Proceedings of the National Academy of Sciences of the United States of America 98: 166–170.CrossRefGoogle Scholar
  31. Pimm S. L. (1982) Food Webs. Chapman & Hall, London.Google Scholar
  32. Pimm S. L. & Lawton J. H. (1977) The number of trophic levels in ecological communities. Nature 275: 542–544.Google Scholar
  33. Polis G. A., Anderson W. B. & Holt R. D. (1997) Toward an integration of landscape and food web ecology: The dynamics of spatially subsidized food webs. Annual Review of Ecology and Systematics 28: 289–316.CrossRefGoogle Scholar
  34. Polis G. A. & Winemiller K., eds. (1996) Food Webs: Integration of Pattern and Process. Chapman & Hall, New York.Google Scholar
  35. Post D. M. Broadening the discourse on food-chain length. Trends in Ecology and Evolution (in press).Google Scholar
  36. Post D. M., Pace M. L. & Hairston N. G. (2000) Ecosystem size determines food-chain length in lakes. Nature 405: 1047–1049.CrossRefGoogle Scholar
  37. Power M. E. & Rainey W. E. Food webs and resource sheds: Towards spatially delimiting trophic interactions. In: Ecological Consequences of Habitat Heterogeneity. (ed. Z. Kawabata). Blackwell Science, Oxford. (in press)Google Scholar
  38. Ritchie M. E. (1999) Biodiversity and reduced extinction risks in spatially isolated rodent populations. Ecology Letters 2: 11–13.CrossRefGoogle Scholar
  39. Ritchie M. E. & Olff H. (1999) Spatial scaling laws yield a synthetic theory of biodiversity. Nature 400: 557–560.CrossRefPubMedGoogle Scholar
  40. Roland J. & Taylor P. D. (1997) Insect parasitoid species respond to forest structure at different spatial scales. Nature 386: 710–713.CrossRefGoogle Scholar
  41. de Roos A. M., McCauley E. & Wilson W. G. (1998) Pattern formation and the spatial scale of interaction between predators and their prey. Theoretical Population Biology 53: 108–130.CrossRefGoogle Scholar
  42. Rosenzweig M. L. (1973) Exploitation in 3 trophic levels. American Naturalist 107: 275–294.CrossRefGoogle Scholar
  43. Rosenzweig M. L. (1995) Species Diversity in Space and Time. Cambridge University Press, UK.Google Scholar
  44. Rosenzweig M. L. & Macarthur R. H. (1963) Graphical representation and stability conditions of predator–prey interactions. American Naturalist 97: 209–223.CrossRefGoogle Scholar
  45. Ruxton G. D. & Rohani P. (1998) Population floors and the persistence of chaos in ecological models. Theoretical Population Biology 53: 175–183.CrossRefGoogle Scholar
  46. Schneider D. W. (1997) Predation and food web structure along a habitat duration gradient. Oecologia 110: 567–575.CrossRefGoogle Scholar
  47. Schoener T. W. (1989) Food webs from the small to the large. Ecology 70: 1559–1589.Google Scholar
  48. Schoener T. W., Spiller D. A. & Morrison L. W. (1995) Variation in the Hymenopteran parasitoid fraction on Bahamian islands. Acta Oecologica-International Journal of Ecology 16: 103–121.Google Scholar
  49. Sears A. L. W., Holt R. D. & Polis G. A. Feast and famine in food webs: the effects of pulsed productivity. In: Food Webs at the Landscape Scale: the Ecology of Trophic Flow Across Habitats. (eds G. A. Polis, G. R. Huxel & M. Power). University of Chicago Press, Chicago. (in press).Google Scholar
  50. Spencer M. & Warren P. H. (1996) The effects of habitat size and productivity on food web structure in small aquatic microcosms. Oikos 75: 419–430.Google Scholar
  51. Steffan-Dewenter I. & Tscharntke T. (2000) Butterfly community structure in fragmented habitats. Ecology Letters 3: 449–456.Google Scholar
  52. Sterner R. W., Bajpai A. & Adams T. (1997) The enigma of food chain length: Absence of theoretical evidence for dynamic constraints. Ecology 78: 2258–2262.Google Scholar
  53. Stone L. (1993) Period-doubling reversals and chaos in simple ecological models. Nature 365: 617–620.CrossRefGoogle Scholar
  54. Stone L. & Hart D. (1999) Effects of immigration on the dynamics of simple population models. Theoretical Population Biology 55: 227–234.CrossRefGoogle Scholar
  55. Tilman D. & Kareiva P., eds. (1997) Spatial Ecology: the Role of Space in Population Dynamics and Interspecific Interactions. Princeton University Press, Princeton, NJ.Google Scholar
  56. Townsend C. R., Thompson R. M., McIntosh A. R., Kilroy C., Edwards E. & Scarsbrook M. R. (1998) Disturbance, resource supply, and food-web architecture in streams. Ecology Letters 1: 200–209.CrossRefGoogle Scholar
  57. Van Nouhuys S. & Hanski I. (1999) Host diet affects extinctions and colonizations in a parasitoid metapopulation. Journal of Animal Ecology 68: 1248–1258.CrossRefGoogle Scholar
  58. Weisser W. W., Jansen V. A. A. & Hassell M. P. (1997) The effects of a pool of dispersers on host-parasitoid systems. Journal of Theoretical Biology 189: 413–425.CrossRefGoogle Scholar
  59. Whittaker R. J. & Jones S. H. (1994) Structure in re-building insular ecosystems – an empirically derived model. Oikos 69: 524–530.Google Scholar
  60. Wilson H. B., Hassell M. P. & Holt R. D. (1998) Persistence and area effects in a stochastic tritrophic model. American Naturalist 151: 587–595.CrossRefGoogle Scholar
  61. Yodzis P. (1988) The indeterminacy of ecological interactions as perceived through perturbation experiments. Ecology 69: 508–515.Google Scholar

Copyright information

© Ecological Society of Japan 2002

Authors and Affiliations

  1. 1.Department of ZoologyUniversity of FloridaGainesville, FloridaUSA

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