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Landscape Ecology

, Volume 18, Issue 3, pp 315–332 | Cite as

Modelling the effects of landscape pattern and grazing regimes on the persistence of plant species with high conservation value in grasslands in south-eastern Sweden

  • Sara A.O. Cousins
  • Sandra Lavorel
  • Ian Davies
Article

Abstract

Semi-natural grasslands in Sweden are threatened by land-use change and lack of management with attendant risk to their biodiversity. We present a model to explore the effects of grazing frequency and intensity on plant species persistence, and the relative effects of grassland size and pattern. We used a landscape modelling platform, LAMOS (LAndscape MOdelling Shell), to design a landscape model of vegetation dynamics incorporating the effects of local succession, dispersal and grazing disturbance. Five plant functional groups (PFG), representing various combinations of persistence and dispersal character, light requirements and disturbance responses, were defined to model species dynamics. Based on old cadastral maps three different landscapes were designed representing specific time-layers, i.e., a historical (17th to 18th century), a pre-modern (1940s) and a present-day landscape. Simulations showed that a threshold was crossed when grasslands decreased in area to about 10–30% of the modelled area, and as a consequence the biomass of grassland-specific PFGs was strongly reduced. These competition sensitive groups did not persist in the model even with intense grazing in the present-day landscape, where grasslands occupy 11% of the total area. However, all grassland species would have been able to persist in the historical landscape, where grasslands occupied 59% of the total area, even without grazing. Our results suggest that continuous but low-intensity grazing is more positive for grassland PFGs than discontinuous but highly intensive grazing. This effect was particularly strong when the frequency and/or intensity of grazing dropped below a threshold of 20%. Simulations using three landscape maps designed to explore effects of further fragmentation and habitat loss showed that the spatial pattern of remaining grasslands is important for the persistence of grassland-specific PFG. The model presented here is an advance towards more realistic grazing models to explore the effects of prescribed grazing and landscape fragmentation on the persistence species or plant functional groups.

disturbance LAMOS landscape history land use modelling Plant Functional Groups semi-natural grassland 

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References

  1. Andrén, H. 1997. Habitat fragmentation and changes in biodiversity. Ecological Bulletin 46: 171–181.Google Scholar
  2. Austin, M.P. 1999. The potential contribution of vegetation ecology to biodiversity research. Ecography 22: 465–484.Google Scholar
  3. Austrheim, G., Olsson, E.G.A. and Grøntvedt, E. 1999. Land-use impact on plant communities in semi-natural grasslands of Budalen, central Norway. Biological Conservation 87: 369–379.CrossRefGoogle Scholar
  4. Bazzaz, F.A. 1996. Plants in Changing Environments-Linking physiological, population and community ecology. Cambridge University Press, Cambridge, UK.Google Scholar
  5. Bruun, H.H. 2000. Patterns of species richness in dry grassland patches in agricultural landscape. Ecography 23: 641–650.Google Scholar
  6. Bullock, J.M., Franklin, J., Stevenson, M.J., Silvertown, J., Coulson, S.J., Gregory, S.J. and Tofts, R. 2001. A plant trait analysis of responses to grazing in a long-term experiment. Journal of Applied Ecology 38: 253–267.Google Scholar
  7. Carmel, Y. and Kadmon, R. 1999. Grazing, topography, and long term vegetation changes in a Mediterranean ecosystem. Plant Ecology 145: 239–250.Google Scholar
  8. Colasanti, R.L. and Grime, J.P. 1993. Resource dynamics and vegetation processes: a deterministic model using two-dimensional cellular automata. Functional Ecology 7: 169–176.Google Scholar
  9. Collins, S.L., Knapp, A.K., Briggs, J.M., Blair, J.M., and Steinauer, E.M. 1998. Modulation of diversity by grazing and mowing in native tallgrass prairie. Science 280: 745–747.PubMedGoogle Scholar
  10. Cousins, S.A.O. 2001. Analysis of land-cover transitions based on 17th and 18th century cadastral maps and aerial photographs. Landscape Ecology 16: 41–54.CrossRefGoogle Scholar
  11. Cousins, S.A.O. and Eriksson, O. 2001. The occurrence of plant biodiversity in a hemiboreal landscape: the effects of habitat and history. Ecography 24: 461–469.CrossRefGoogle Scholar
  12. Cousins, S.A.O. and Eriksson, O. 2002. The influence of management history and habitat on plant species richness in a rural hemiboreal landscape, Sweden. Landscape Ecology 17: 517–529.Google Scholar
  13. Díaz, S., Briske, D., and McIntyre, S. 2002. Range management and plant functional types. In: Hodkingson K. and Grice A. (eds), Global Rangelands, Progress and Prospects. CAB International, Wallingford, UK, in press.Google Scholar
  14. Diaz, S., Noy-Meir, I., and Cabido, M. 2001. Can grazing response of herbaceous plants be predicted from simple vegetative traits? Journal of Applied Ecology 38: 497–508.Google Scholar
  15. Ehrlén J. and Eriksson O. 2000. Dispersal limitation and patch occupancy in forest herbs. Ecology 81: 1667–1674.Google Scholar
  16. Ekstam, U. and Forshed, N. 1997. If grassland management ceases. Vascular plants as indicator species in meadows and pastures. Swedish Nature Protection Board, Stockholm, Sweden. (In Swedish with summary in English).Google Scholar
  17. Ekstam, U., Aronsson, M. and Forshed, N. 1988. Ängar. LT förlag, Stockholm, Sweden.Google Scholar
  18. Eriksson, Å. and Eriksson, O. 1997. Seedling recruitment in semi-natural pastures: the effects of disturbance, seed size, phenology and seed bank. Nordic Journal of Botany 17: 469–482.Google Scholar
  19. Eriksson, Å. and Eriksson, O. 2000. Population dynamics of the perennial Plantago media in semi-natural grasslands. Journal of Vegetation Science 11: 245–252.Google Scholar
  20. Eriksson, Å., Eriksson, O. and Berglund, H. 1995. Species abundance patterns of plants in Swedish semi-natural pastures. Ecography 18: 310–317.Google Scholar
  21. Eriksson, O. 1996. Regional dynamics of plants: a review of evidence for remnant, source-sink and meta-populations. Oikos 77: 248–258.Google Scholar
  22. Eriksson, O. 2000. Seed dispersal and colonization ability of plants-assessment and implications for conservation. Folia Geobotanica 35: 115–123.Google Scholar
  23. Eriksson, O. and Kiviniemi, K. 1999. Site occupancy, recruitment and extinction thresholds in grassland plants: an experimental study. Biological Conservation 87: 319–325.Google Scholar
  24. Gitay, H. and Noble, I. R. 1997. What are functional types and how should we seek them? In: Plant Functional Types: their Relevance to Ecosystem Properties and Global Change, pp. 3–19. Smith, T.M., Shugart, H.H. and Woodward, F.I. (eds), Cambridge University Press, Cambridge, UK.Google Scholar
  25. Grace, J.B. 1999. The factors controlling species density in herbaceous plant communities: an assessment. Perspectives in Plant Ecology Evolution and Systematics 2: 1–28.Google Scholar
  26. Grime, J.P. 1979. Plant Strategies and Vegetation Processes. John Wiley & Sons, Chichester, UK.Google Scholar
  27. Grime, J.P. 2001. Plant Strategies, Vegetation Processes and Ecosystem Properties, 2nd Edition. John Wiley and Sons, Chichester, UK.Google Scholar
  28. Grubb, P.J. 1977. The maintenance of species-richness in plant communities: the importance of the regeneration niche. Biological Review 52: 107–145.Google Scholar
  29. Hanski, I. 1999. Metapopulation Ecology. Oxford Series in Ecology and Evolution. Oxford University Press, Oxford, UK.Google Scholar
  30. Hansson, M. and Fogelfors, H. 2000. Management of semi-natural grassland; results from a 15-year-old experiment in southern Sweden. Journal of Vegetation Science 11: 31–38.Google Scholar
  31. Harper, J.L. 1977. The Population Biology of Plants. Academic Press, London, UK.Google Scholar
  32. Harrison, S. and Bruna, E. 1999. Habitat fragmentation and large-scale conservation: what do we know for sure? Ecography 22: 225–232.Google Scholar
  33. Holling, C.S. 1986. Resilience in ecosystems; local surprise and global change. In: Sustainable Development of the Biosphere. W.C. Clark and R.E, Munn (eds), Cambridge University Press, Cambridge, UK.Google Scholar
  34. Hulme, P.E. 1996. Herbivory, plant regeneration, and species coexistence. Journal of Ecology 84: 609–615.Google Scholar
  35. Hulme, P.D., Pakeman, R.J., Torvell, L., Fisher, J.M. and Gordon, I.J. 1999. The effects of controlled sheep grazing on the dynamics of upland Agrostis-Festuca grassland. Journal of Applied Ecology 36: 886–900.Google Scholar
  36. Hunt, L.P. 2001. Heterogeneous grazing causes local extinction of edible perennial shrubs: a matrix analysis. Journal of Applied Ecology 38: 238–252.Google Scholar
  37. Huston, M.A. 1994. Biological Diversity the Coexistence of Species on Changing Landscapes. Cambridge University press, Cambridge, UK.Google Scholar
  38. Huston, M.A. and Smith, T.M., 1987. Plant succession: life history and competition. American Naturalist 130: 168–198.Google Scholar
  39. Jeltsch, F., Milton, S.J., Dean, W.R.J. and van Rooyen, N. 1997a. Simulated pattern formation around artificial waterholes in the semi-arid Kalahari. Journal of Vegetation Science 8: 177–188.Google Scholar
  40. Jeltsch, F., Milton, S.J., Dean, W.R.J. and van Rooyen, N. 1997b. Analysing shrub encroachment in the southern Kalahari: a grid-based modelling approach. Journal of Applied Ecology 34: 1497–1508.Google Scholar
  41. Kiviniemi, K. 1999. Evolution of seed attributes, dispersal and population dynamics of plants, with special emphasis on fragmented habitats. Doctoral thesis, Department of Botany, Stockholm University.Google Scholar
  42. Kiviniemi, K. and Eriksson, O. 1999. Dispersal, recruitment and site occupancy of grassland plants in fragmented habitats. Oikos 86: 241–253.Google Scholar
  43. Kull, K. and Zobel, M. 1991: High species richness in an Estonian wooded meadow. Journal of Vegetation Science 2: 711–714.Google Scholar
  44. Landsberg, J., O’Connor, T. and Freudenberger, D. 1999. The impacts of livestock grazing on biodiversity in natural ecosystems. In: Nutritional Ecology of Herbivores. Proc. Vth International Symposium on the Nutrition of Herbivores, pp. 752–777. Jung, H.G. and Fahey, G.C. (eds), American Society of Animal Science, Savoy, Illinois, USA.Google Scholar
  45. Lavorel, S., Davies, I. and Noble, I. 2000. LAMOS: a Landscape modelling shell. In: Proceeding of the Landscape Fire Modeling Workshop, pp. 25–28. Hawkes, B.C. and Flannigan, M.D. (eds), Victoria, British Columbia, November 15-16.Google Scholar
  46. Lavorel, S., McIntyre, S., Landsberg, J., and Forbes, D. 1997. Plant functional classifications: from general groups to specific groups based on response to disturbance. Trends in Ecology and Evolution 12: 474–478.Google Scholar
  47. Lennartsson, T. and Svensson, R. 1996. Patterns in the decline of three species of Gentianella (Gentianaceae) in Sweden, illustrating the deterioration of semi-natural grasslands. Symbolae Botanicae Upsaliensis 31: 170–184.Google Scholar
  48. Lindborg, R. and Ehrlén, J. 2002. Evaluating the extinction risk of a perennial herb: demographic data versus historical records. Conservation Biology 16: 683–690.Google Scholar
  49. Lindenmayer, D.B., Manning, A.D., Smith, P.L., Possingham, H.P., Fischer, J., Oliver, I. and McCarthy, M.A. 2002. The focal-species approach and landscape restoration: A critique. Conservation Biology 16: 338–345.Google Scholar
  50. McIntyre, S. and Hobbs, R. 1999. A framework for conceptualizing human effects on landscapes and its relevance to management and research models. Conservation Biology 13: 1282–1292.CrossRefGoogle Scholar
  51. McIntyre, S. and Lavorel, S. 2001. Livestock grazing in sub-tropical pastures: steps in the analysis of attribute response and plant functional types. Journal of Ecology 89: 209–226.Google Scholar
  52. McIntyre, S., McIvor, J.G. and MacLeod, N. 2000. Principles for sustainable grazing in eucalypt woodlands: Landscape-scale indicators and the search for thresholds. In: Management for Sustainable Ecosystems. Centre for Conservation Biology, pp. 92–100. Hale, P., Petrie, A., Moloney, D. and Sattler, P. (eds), The University of Queensland, Brisbane, Australia.Google Scholar
  53. Médail, F., Roche, P. and Tatoni, T. 1998. Functional groups in phytoecology: an application to the study of isolated plant communities in Mediterranean France. Acta Oecologica 19: 263–274.Google Scholar
  54. Milne, B.T., Turner, M.G., Wiens, J.A. and Johnson, A.R., 1992. Interactions between the fractal geometry of landscapes and allometric herbivory. Theoretical Population Biology 41: 337–353.Google Scholar
  55. Moloney, K.A. and Levin, S.A. 1996. The effects of disturbance architecture on landscape-level population dynamics. Ecology 77: 375–394.Google Scholar
  56. Montalvo, J., Casado, M.A., Levassor, C. and Pineda. F.D. 1993. Species diversity patterns in Mediterranean grasslands. Journal of Vegetation Science 4: 213–222.Google Scholar
  57. Moore, A.D. and Noble, I.R. 1990. An individualistic model of vegetation stand dynamics. Journal of Environmental Management 31: 61–81.Google Scholar
  58. Noble, I.R. and Slatyer, R.O. 1980. The use of vital attributes to predict successional changes in plant communities subject to recurrent disturbances. Vegetatio 43: 5–21.CrossRefGoogle Scholar
  59. Noble, I.R. 1999. Effect of landscape fragmentation, disturbance, and succession on ecosystem function. In: Integrating Hydrology, Ecosystem Dynamics, and Biogeochemistry in Complex Landscapes. pp. 298–312, Tenhunen, J. D. and Kabat, P. (eds), John Wiley & Sons Ltd, Chichester, UK.Google Scholar
  60. Opdam, P., Foppen, R. and Vos, C. 2002. Bridging the gap between ecology and spatial planning in landscape ecology. Landscape Ecology 16: 767–779.Google Scholar
  61. Palmer, M.W. 1992. The coexistence of species in fractal landscapes. American Naturalist 139: 375–397.Google Scholar
  62. Pärtel, M., Mändla. R. and Zobel, M. 1999. Landscape history of a calcareous (alvar) grassland in Hanila, western Estonia during the last three hundred years. Landscape Ecology 14: 187–196.CrossRefGoogle Scholar
  63. Pausas, J.G. 1999. Response of plant functional types to changes in the fire regime in Mediterranean ecosystems: a simulation approach. Journal of Vegetation Science 10: 717–722.Google Scholar
  64. Peart, D.R. 1989. Species interactions in a successional grassland. Seed rain and seedling recruitment. Journal of Applied Ecology 77: 236–251.Google Scholar
  65. Pettit, N.E. and Froend, R.H. 2001. Long-term changes in the vegetation after the cessation of livestock grazing in Eucalyptus marginata (jarrah) woodland remnants. Austral Ecology 26: 22–31.Google Scholar
  66. Pickup, G., 1994. Modelling patterns of defoliation of grazing animals in rangelands. Journal of Applied Ecology 31: 231–246.Google Scholar
  67. Plotnick, R.E. and Gardner, R.G. 2002. A general model for simulating the effects of landscape heterogeneity and disturbance on community patterns. Ecological Modelling 147: 171–187.Google Scholar
  68. Poschlod, P. and Bonn, S. 1998. Changing dispersal processes in the central European landscape since the last ice age: an explanation for the actual decrease of plant species richness in different habitats? Acta Botanica Neerlandica 47: 27–44.Google Scholar
  69. Prach, K. 1997. Changes in species traits during succession: a search for pattern. Oikos 79: 201–205.Google Scholar
  70. Rees, M. and Hill, R.L. 2001. Large-scale disturbances and biological control of gorse populations. Journal of Applied Ecology 38: 364–378.Google Scholar
  71. Reynolds, J.F., Virginia, R.A. and Schlesinger, W.H. 1997. Defining functional types for models of desertification. In: Plant Functional Types and Environmental Change. pp. 195–216. Smith, T.M., Shugart, H.H. and Woodward, F.I. (eds). Cambridge University Press, Cambridge, UK.Google Scholar
  72. Ruckelshaus, M., Hartway, C. and Kareiva, P. 1997. Assessing the data requirements of spatially explicit dispersal models. Conservation Biology 11: 1298–1306.CrossRefGoogle Scholar
  73. Ryser, P., Langenauer, R. and Gigon, A. 1995. Species richness and vegetation structure in a limestone grassland after 15 years management with six biomass removal regimes. Folia Geobotanica Phytotaxonomica 30: 157–167.Google Scholar
  74. Schippers, P., van Groenendael, J.M., Vleeshouwers, L.M. and Hunt, R. 2001. Herbaceous plant strategies in disturbed habitats. Oikos 95: 198–210.Google Scholar
  75. Sternberg, M., Gutman, M., Perevolotsky, A., Ungar, E.D. and Kigel, J. 2000. Vegetation response to grazing management in a Mediterranean herbaceous community: a functional group approach. Journal of Applied Ecology 37: 224–237.Google Scholar
  76. Strykstra, R.J., Bekker, R.M. and Bakker, J.P. 1998. Assessment of dispersule availability: its practical use in restoration management. Acta Botanica Neerlandica 47: 57–70.Google Scholar
  77. Suding, K.N. and Goldberg, D.E. 2001. Do disturbances alter competitive hierarchies? Mechanisms of change following gap creation. Ecology 82: 2133–2149.Google Scholar
  78. Tilman, D. 1988. Plant Strategies and the Dynamics and Structure of Plant Communities. Princeton University Press, Princeton, New Jersey, USA.Google Scholar
  79. Tilman, D., May, R.M., Lehman, C.L. and Nowak, M.A. 1994. Habitat destruction and the extinction debt. Nature 371: 65–66.CrossRefGoogle Scholar
  80. Turnbull, L.A., Crawley, M.J. and Rees, M. 2000. Are plant populations seed-limited? A review of seed sowing experiments. Oikos 88: 225–238.Google Scholar
  81. van der Maarel, E. and Titlyanova, A. 1989. Above-ground and below-ground biomass related in steppes under different grazing conditions. Oikos 56: 364–370.Google Scholar
  82. van Dorp, D., Schippers, P., and van Groenendael, J.M. 1997. Migration rates of grassland plants along corridors in fragmented landscapes assessed with a cellular automation model. Landscape Ecology 12: 39–50.Google Scholar
  83. Vesk, P.A. and Westoby, M. 2001. Predicting plant species’ responses to grazing. Journal of Applied Ecology 38: 897–909.Google Scholar
  84. Wahren, C.-H.A., Papst, W.A. and Williams, R.J. 1994. Long-term vegetation change in relation to cattle grazing in subalpine grassland and heathland on the Bogong High Plains. Australian Journal of Botany 42: 607–639.Google Scholar
  85. Weber, G.E., Jeltsch, F., van Rooyen, N. and Milton, S.J. 1998. Simulated long-term vegetation response to grazing heterogeneity in semi-arid rangelands. Journal of Applied Ecology 35: 687–699.Google Scholar
  86. Weibull, A.-C. 2002. Diversity in the agricultural landscape. Species richness and composition in relation to farm management, landscape structure and habitat. Doctoral thesis, Department of Ecology and Crop Production Science, Swedish University of Agricultural Sciences, Uppsala.Google Scholar
  87. Weigand, T. and Milton, S.J. 1996. Vegetation change in semi-arid communities: Simulating probabilities and time scales. Vegetatio 125: 169–183.Google Scholar
  88. Weins, J.A. 1997. Metapopulation dynamics and landscape ecology. In: Metapopulation Biology: Ecology, Genetics, and Evolution. pp. 43–68. Hanski, I. A. and Gilpin, M. E. (eds). Academic Press Ltd, San Diego, California, USA.Google Scholar
  89. With, K.A. 1997. The application of neutral landscape models in conservation biology. Conservation Biology 11: 1069–1080.Google Scholar
  90. With, K.A. and King, A.W. 1997. The use and misuse of neutral landscape models in ecology. Oikos 79: 219–229.Google Scholar
  91. With, K.A. and King, A.W. 1999. Extinction thresholds for species in fractal landscapes. Conservation Biology 13: 314–326.Google Scholar
  92. Zobel, M. 1992. Plant species coexistence - the role of historical and evolutionary and ecological factors. Oikos 65: 314–320.Google Scholar

Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • Sara A.O. Cousins
    • 1
  • Sandra Lavorel
    • 2
    • 3
  • Ian Davies
    • 3
  1. 1.Department of Botany/ Department of Physical Geography and Quaternary GeologyStockholm UniversitySweden
  2. 2.Centre d’Ecologie Fonctionnelle et Evolutive, CNRSMontpellierFrance
  3. 3.Ecosystem Dynamics Group, Research School of Biological SciencesAustralian National UniversityAustralia

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