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Using image-analysis to quantify the horizontal vegetation pattern in two multi-species savanna grasslands

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Abstract

Spatial patterns in natural vegetations result to a large extent from competitive interactions between neighbouring plants. Pattern analyses techniques are often used to estimate the importance of competitive interactions between plants. In this study, we used pattern analysis techniques, based upon image-analyses, to estimate the importance of competitive interactions for maintaining the spatial pattern of neighbouring perennial grasses in natural savanna populations in Zimbabwe.

The results of the different methods used, including nearest-neighbour and non-overlapping domain analysis, suggest that competitive interactions between neighbouring tufts play a limited role in maintaining the spatial pattern in these savanna grasslands.

Methodological features and the usefulness of pattern analysis techniques to estimate competition between neighbouring plants in natural vegetations are discussed.

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References

  • Aguilera, M. O. & Lauenroth, W. K. 1993. Neighborhood interactions in a natural population of the perennial bunchgrass Bouteloua gracilis. Oecologia 94: 595-602.

    Google Scholar 

  • Antonovics, J. & Levin, D. A. 1980. The ecological and genetic consequences of density dependent regulation in plants. Ann. Rev. Ecol. Syst. 11: 411-452.

    Google Scholar 

  • Benjamin, L. R. & Hardwick, R. C. 1986. Sources of variation and measures of variability in even-aged stands of plants. Ann. Bot. 58: 757-778.

    Google Scholar 

  • Bonan, G. B. 1993. Analysis of neighborhood competition among annual plants: implications of a plant growth model. Ecol. Modelling 65: 123-136.

    Google Scholar 

  • Carter, A. J. & O'Connor, T. G. 1991. A two-phase mosaic in a savanna grassland. J. Veg. Sci. 2: 231-236.

    Google Scholar 

  • Czárán, T. & Bartha, S. 1992. Spatiotemporal Dynamic Models of Plant Populations and Communities. TREE 7: 38-42.

    Google Scholar 

  • Firbank, L. G. & Watkinson, A. R. 1987. On the analysis of competition at the level of the individual plant. Oecologia 71: 308-317.

    Google Scholar 

  • Greig-Smith, P. 1979. Pattern in vegetation. J. Ecol. 67: 755-779.

    Google Scholar 

  • Harper, J. L. 1977. Population Biology of Plants. Academic Press, New York.

    Google Scholar 

  • Hutchings, M. J. & Discombe, R. J. 1986. The detection of spatial pattern in plant populations. J. Biog. 13: 225-236.

    Google Scholar 

  • Hutchings, M. J. 1997. The structure of plant populations. Pp. 325 -358. In: Crawley, M.J. (ed.), Plant Ecology. Blackwell Science Ltd.

  • Kenkel, N. C., Hoskins, J. A. & Hoskins, W. D. 1989. Edge effects in the use of area polygons to study competition. Ecology 70: 272-274.

    Google Scholar 

  • Kenkel, N. C. 1990. Spatial competition models for plant populations. Coenoses 5: 149-158.

    Google Scholar 

  • Lepš, J. 1990. Can underlying mechanisms be deduced from observed patterns. Pp. 1-11. In: Krahulec, F., Agnew, A.D.Q., Agnew, S. & Willems, J.H. (eds.), Spatial processes in plant communities. Academia Prague.

  • Liddle, M. J., Budd, C. S. J. & Hutchings, M. J. 1982. Population dynamics and neighbourhood effects in establishing swards of Festuca rubra. Oikos 38: 52-59.

    Google Scholar 

  • Mack, R. N. & Harper, J. L. 1977. Interference in dune annuals. Spatial pattern and neighbourhood effects. J. Ecol. 65: 345-363.

    Google Scholar 

  • Matlack, G. R. & Harper, J. L. 1986. Spatial distribution and the performance of individual plants in a natural population of Silene dioica. Oecologia 70: 121-127.

    Google Scholar 

  • Mead, R. 1966. A relationship between individual plant-spacing and yield. Ann. Bot. 30: 301-309.

    Google Scholar 

  • Mithen, R., Harper, J. L. & Weiner, J. 1984. Growth and mortality of individual plants as a function of available area'. Oecologia 62: 57-60.

    Google Scholar 

  • O'Connor, T. G. 1993. The influence of rainfall and grazing on the demography of some African savanna grasses. A matrix modelling approach. J. Appl. Ecol. 30: 119-132.

    Google Scholar 

  • Pielou, E. C. 1962. The use of plant-to neighbour distances for the detection of competition. J. Ecol. 50: 357-367.

    Google Scholar 

  • Prentice, I. C. & Werger, M. J. A. 1985. Clump spacing in a desert dwarf shrub community. Vegetatio 63: 133-139.

    Google Scholar 

  • Silander, J. A. & Pacala, S. W. 1985. Neighbourhood predictors of plant performance. Oecologia 55: 256-263.

    Google Scholar 

  • Smith, T. M. & Goodman, P. S. 1986. The effect of competition on the structure and dynamics of Acacia savannas in southern Africa. J. Ecol. 74: 1031-1044.

    Google Scholar 

  • Sokal, R. F. & Rohlf, J. F. 1981. Biometry. 2nd ed., W. H. Freeman & Co., New York.

    Google Scholar 

  • SPSS 1992. SPSS for Windows: Advanced Statistics: Release 6.0. SPSS Inc., Chicago, Illinois.

    Google Scholar 

  • Upton, G. & Fingleton, B. 1985. Spatial data analysis by example. Volume I. Point patterns and quantitative data. Wiley, New York.

    Google Scholar 

  • Waller, D. M. 1981. Neighbourhood competition in several Violet populations. Oecologia 51: 116-122.

    Google Scholar 

  • Ward, H. K., Richardson, F. D. & Denny, R. P. & Dye, P. J. 1979. Matopos Research Station. A perspective. Rhodesian Agric. J. 76: 5-18.

    Google Scholar 

  • Watt, A. S. 1947. Pattern and process in the plant community. J. Ecol. 35: 1-22.

    Google Scholar 

  • Werger, M. J. A. 1983. Tropical grasslands, savannas, woodlands: nautral and manmade. Pp. 107-137. In: Holzner, W., Werger, M. J. A. & Ikusima, I. (eds), Man's impact on vegetation. Junk Publishers, The Hague.

    Google Scholar 

  • Yeaton, R. I., Frost, S. & Frost, P. G. H. 1988. The structure of a grass community in Burkea africana savanna during recovery from fire. South Afr. J. Bot. 54: 367-371.

    Google Scholar 

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Fransen, B., de Boer, M., Terlou, M. et al. Using image-analysis to quantify the horizontal vegetation pattern in two multi-species savanna grasslands. Plant Ecology 138, 231–237 (1998). https://doi.org/10.1023/A:1009706621867

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